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Abdullah M, Alabduljalil T. NOVEL RETINAL FINDINGS IN A PATIENT WITH AUTOSOMAL RECESSIVE CUTIS LAXA TYPE 2A. Retin Cases Brief Rep 2024; 18:400-403. [PMID: 36728588 DOI: 10.1097/icb.0000000000001399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE To report a case of autosomal recessive cutis laxa type 2A with novel retinal findings. METHODS Case report. RESULTS A 22-year-old female patient presented with a long-standing history of reduced visual acuity in her right eye. She has generalized redundant skin, downslanting of palpebral fissures, and long philtrum. Ophthalmic examination showed ptosis in her right eye and visual acuity of 20/2000 in the right eye and 20/30p in the left eye. Funduscopic examination showed a round macular scar lesion in the right eye macula and a chorioretinal scar superonasally in the left eye. Multimodal imaging showed macular atrophy in the right eye with speckled hypoautofluorescence of the described lesions. Genetic testing showed a homozygous splice acceptor variant of the ATP6V0A2 gene. CONCLUSION The natural history of the presented pigmentary lesions is not known, and further follow-up is needed to assess any progressive nature. Our case adds to the variability of ophthalmic manifestations reported in autosomal recessive cutis laxa type 2A and, therefore, to the importance of regular ophthalmic surveillance in patients with cutis laxa.
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Affiliation(s)
- Mohammad Abdullah
- Albahar Eye Center, Ibn Sina Hospital, Sabah Health Region, Kuwait; and
| | - Talal Alabduljalil
- Surgery Department, Health Sciences Center, Kuwait University, Jabriya, Kuwait
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2
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Zhang Y, Sun M, Li N, Zhao Y, Zhang F, Shu J, Liu Y, Cai C. Identification of a novel intronic variant of ATP6V0A2 in a Han-Chinese family with cutis laxa. Mol Biol Rep 2024; 51:498. [PMID: 38598037 DOI: 10.1007/s11033-024-09446-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 03/13/2024] [Indexed: 04/11/2024]
Abstract
BACKGROUND Cutis laxa is a connective tissue disease caused by abnormal synthesis or secretion of skin elastic fibers, leading to skin flabby and saggy in various body parts. It can be divided into congenital cutis laxa and acquired cutis laxa, and inherited cutis laxa syndromes is more common in clinic. METHODS In this study, we reported a case of a Han-Chinese male newborn with ATP6V0A2 gene variant leading to cutis laxa. The proband was identified by whole-exome sequencing to determine the novel variant, and their parents were verified by Sanger sequencing. Bioinformatics analysis and minigene assay were used to verify the effect of this variant on splicing function. RESULTS The main manifestations of the proband are skin laxity, abnormal facial features, and enlargement of the anterior fontanelle. Whole-exome sequencing showed that the newborn carried a non-canonical splicing-site variant c.117 + 5G > T, p. (?) in ATP6V0A2 gene. Sanger sequencing showed that both parents of the proband carried the heterozygous variant. The results of bioinformatics analysis and minigene assay displayed that the variant site affected the splicing function of pre-mRNA of the ATP6V0A2 gene. CONCLUSIONS In this study, it was identified that ATP6V0A2 gene c. 117 + 5G > T may be the cause of the disease. The non-canonical splicing variants of ATP6V0A2 gene were rarely reported in the past, and this variant expanded the variants spectrum of the gene. The functional study of minigene assay plays a certain role in improving the level of evidence for the pathogenicity of splicing variants, which lays a foundation for prenatal counseling and follow-up gene therapy.
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Affiliation(s)
- Ying Zhang
- Graduate College of Tianjin Medical University, No. 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Mei Sun
- Graduate College of Tianjin Medical University, No. 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
| | - Na Li
- Graduate College of Tianjin Medical University, No. 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
- Department of Neonatology, Tianjin Children's Hospital (Children's Hospital of Tianjin University, No. 238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Yiran Zhao
- Graduate College of Tianjin Medical University, No. 22 Qixiangtai Road, Heping District, Tianjin, 300070, China
- Maternal and Child Health Hospital of Tangshan, No. 14 Jianshe south Road, Lu nan District, Tangshan City, Hebei Province, 063000, China
| | - Fang Zhang
- Department of Neonatology, Tianjin Children's Hospital (Children's Hospital of Tianjin University, No. 238 Longyan Road, Beichen District, Tianjin, 300134, China
| | - Jianbo Shu
- Tianjin Children's Hospital (Children's Hospital of Tianjin University), No. 238 Longyan Road, Beichen District, Tianjin, 300134, China.
- Tianjin Key Laboratory of Birth Defects for Prevention and Treatment, No. 238 Longyan Road, Beichen District, Tianjin, 300134, China.
- Tianjin Pediatric Research Institute, Tianjin Children's Hospital, No. 238 Longyan Road, Beichen District, Tianjin, 300134, China.
| | - Yang Liu
- Department of Neonatology, Tianjin Children's Hospital (Children's Hospital of Tianjin University, No. 238 Longyan Road, Beichen District, Tianjin, 300134, China.
| | - Chunquan Cai
- Tianjin Children's Hospital (Children's Hospital of Tianjin University), No. 238 Longyan Road, Beichen District, Tianjin, 300134, China.
- Tianjin Key Laboratory of Birth Defects for Prevention and Treatment, No. 238 Longyan Road, Beichen District, Tianjin, 300134, China.
- Tianjin Pediatric Research Institute, Tianjin Children's Hospital, No. 238 Longyan Road, Beichen District, Tianjin, 300134, China.
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3
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Xue S, Shi W. A novel intronic variant of ATP6V0A2-related cutis laxa with impaired cognitive function. Pediatr Neonatol 2024; 65:209-211. [PMID: 38290920 DOI: 10.1016/j.pedneo.2023.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 12/10/2023] [Accepted: 12/27/2023] [Indexed: 02/01/2024] Open
Affiliation(s)
- Shanshan Xue
- Department of Pediatrics, Tianjin Baodi Hospital, Baodi Clinical College of Tianjin Medical University, Tianjin, 301800, PR China.
| | - Wujuan Shi
- Department of Neonatology, Tianjin Children's Hospital, Tianjin, 300134, PR China
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4
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Chu A, Yao Y, Glibowicka M, Deber CM, Manolson MF. The Human Mutation K237_V238del in a Putative Lipid Binding Motif within the V-ATPase a2 Isoform Suggests a Molecular Mechanism Underlying Cutis Laxa. Int J Mol Sci 2024; 25:2170. [PMID: 38396846 PMCID: PMC10889665 DOI: 10.3390/ijms25042170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 01/19/2024] [Accepted: 02/01/2024] [Indexed: 02/25/2024] Open
Abstract
Vacuolar ATPases (V-ATPases), proton pumps composed of 16 subunits, are necessary for a variety of cellular functions. Subunit "a" has four isoforms, a1-a4, each with a distinct cellular location. We identified a phosphoinositide (PIP) interaction motif, KXnK(R)IK(R), conserved in all four isoforms, and hypothesize that a/PIP interactions regulate V-ATPase recruitment/retention to different organelles. Among the four isoforms, a2 is enriched on Golgi with a2 mutations in the PIP motif resulting in cutis laxa. We hypothesize that the hydrophilic N-terminal (NT) domain of a2 contains a lipid-binding domain, and mutations in this domain prevent interaction with Golgi-enriched PIPs, resulting in cutis laxa. We recreated the cutis laxa-causing mutation K237_V238del, and a double mutation in the PIP-binding motif, K237A/V238A. Circular dichroism confirmed that there were no protein structure alterations. Pull-down assays with PIP-enriched liposomes revealed that wildtype a2NT preferentially binds phosphatidylinositol 4-phosphate (PI(4)P), while mutants decreased binding to PI(4)P. In HEK293 cells, wildtype a2NT was localized to Golgi and co-purified with microsomal membranes. Mutants reduced Golgi localization and membrane association. Rapamycin depletion of PI(4)P diminished a2NT-Golgi localization. We conclude that a2NT is sufficient for Golgi retention, suggesting the lipid-binding motif is involved in V-ATPase targeting and/or retention. Mutational analyses suggest a molecular mechanism underlying how a2 mutations result in cutis laxa.
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Affiliation(s)
- Anh Chu
- Faculty of Dentistry, University of Toronto, Toronto M5G 1G6, ON, Canada; (A.C.); (Y.Y.)
| | - Yeqi Yao
- Faculty of Dentistry, University of Toronto, Toronto M5G 1G6, ON, Canada; (A.C.); (Y.Y.)
| | - Miroslawa Glibowicka
- Division of Molecular Medicine, Research Institute, Hospital for Sick Children, Toronto M5G 0A4, ON, Canada; (M.G.); (C.M.D.)
| | - Charles M. Deber
- Division of Molecular Medicine, Research Institute, Hospital for Sick Children, Toronto M5G 0A4, ON, Canada; (M.G.); (C.M.D.)
- Department of Biochemistry, Faculty of Medicine, University of Toronto, Toronto M5S 1A8, ON, Canada
| | - Morris F. Manolson
- Faculty of Dentistry, University of Toronto, Toronto M5G 1G6, ON, Canada; (A.C.); (Y.Y.)
- Department of Biochemistry, Faculty of Medicine, University of Toronto, Toronto M5S 1A8, ON, Canada
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5
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Huang X, Henck J, Qiu C, Sreenivasan VKA, Balachandran S, Amarie OV, Hrabě de Angelis M, Behncke RY, Chan WL, Despang A, Dickel DE, Duran M, Feuchtinger A, Fuchs H, Gailus-Durner V, Haag N, Hägerling R, Hansmeier N, Hennig F, Marshall C, Rajderkar S, Ringel A, Robson M, Saunders LM, da Silva-Buttkus P, Spielmann N, Srivatsan SR, Ulferts S, Wittler L, Zhu Y, Kalscheuer VM, Ibrahim DM, Kurth I, Kornak U, Visel A, Pennacchio LA, Beier DR, Trapnell C, Cao J, Shendure J, Spielmann M. Single-cell, whole-embryo phenotyping of mammalian developmental disorders. Nature 2023; 623:772-781. [PMID: 37968388 PMCID: PMC10665194 DOI: 10.1038/s41586-023-06548-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 08/16/2023] [Indexed: 11/17/2023]
Abstract
Mouse models are a critical tool for studying human diseases, particularly developmental disorders1. However, conventional approaches for phenotyping may fail to detect subtle defects throughout the developing mouse2. Here we set out to establish single-cell RNA sequencing of the whole embryo as a scalable platform for the systematic phenotyping of mouse genetic models. We applied combinatorial indexing-based single-cell RNA sequencing3 to profile 101 embryos of 22 mutant and 4 wild-type genotypes at embryonic day 13.5, altogether profiling more than 1.6 million nuclei. The 22 mutants represent a range of anticipated phenotypic severities, from established multisystem disorders to deletions of individual regulatory regions4,5. We developed and applied several analytical frameworks for detecting differences in composition and/or gene expression across 52 cell types or trajectories. Some mutants exhibit changes in dozens of trajectories whereas others exhibit changes in only a few cell types. We also identify differences between widely used wild-type strains, compare phenotyping of gain- versus loss-of-function mutants and characterize deletions of topological associating domain boundaries. Notably, some changes are shared among mutants, suggesting that developmental pleiotropy might be 'decomposable' through further scaling of this approach. Overall, our findings show how single-cell profiling of whole embryos can enable the systematic molecular and cellular phenotypic characterization of mouse mutants with unprecedented breadth and resolution.
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Affiliation(s)
- Xingfan Huang
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Paul G. Allen School of Computer Science & Engineering, University of Washington, Seattle, WA, USA
| | - Jana Henck
- Institute of Human Genetics, University Medical Center Schleswig-Holstein, University of Lübeck & Kiel University, Lübeck, Germany
- Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Chengxiang Qiu
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Varun K A Sreenivasan
- Institute of Human Genetics, University Medical Center Schleswig-Holstein, University of Lübeck & Kiel University, Lübeck, Germany
| | - Saranya Balachandran
- Institute of Human Genetics, University Medical Center Schleswig-Holstein, University of Lübeck & Kiel University, Lübeck, Germany
| | - Oana V Amarie
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
| | - Martin Hrabě de Angelis
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
- Chair of Experimental Genetics, TUM School of Life Sciences, Technische Universität München, Freising, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Rose Yinghan Behncke
- Institute of Medical Genetics and Human Genetics of the Charité, Berlin, Germany
- Berlin Institute of Health at Charité - Universitätsmedizin Berlin, BCRT, Berlin, Germany
| | - Wing-Lee Chan
- Institute of Medical Genetics and Human Genetics of the Charité, Berlin, Germany
- Berlin Institute of Health at Charité - Universitätsmedizin Berlin, BCRT, Berlin, Germany
| | - Alexandra Despang
- Max Planck Institute for Molecular Genetics, Berlin, Germany
- Berlin Institute of Health at Charité - Universitätsmedizin Berlin, BCRT, Berlin, Germany
| | - Diane E Dickel
- Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Madeleine Duran
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Annette Feuchtinger
- Core Facility Pathology & Tissue Analytics, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
| | - Helmut Fuchs
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
| | - Valerie Gailus-Durner
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
| | - Natja Haag
- Institute for Human Genetics and Genomic Medicine, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Rene Hägerling
- Max Planck Institute for Molecular Genetics, Berlin, Germany
- Institute of Medical Genetics and Human Genetics of the Charité, Berlin, Germany
- Berlin Institute of Health at Charité - Universitätsmedizin Berlin, BCRT, Berlin, Germany
| | - Nils Hansmeier
- Max Planck Institute for Molecular Genetics, Berlin, Germany
- Institute of Medical Genetics and Human Genetics of the Charité, Berlin, Germany
- Berlin Institute of Health at Charité - Universitätsmedizin Berlin, BCRT, Berlin, Germany
| | | | - Cooper Marshall
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Brotman Baty Institute for Precision Medicine, University of Washington, Seattle, WA, USA
| | | | - Alessa Ringel
- Max Planck Institute for Molecular Genetics, Berlin, Germany
- Institute of Medical Genetics and Human Genetics of the Charité, Berlin, Germany
| | - Michael Robson
- Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Lauren M Saunders
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Patricia da Silva-Buttkus
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
| | - Nadine Spielmann
- Institute of Experimental Genetics, German Mouse Clinic, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
| | - Sanjay R Srivatsan
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Sascha Ulferts
- Institute of Medical Genetics and Human Genetics of the Charité, Berlin, Germany
- Berlin Institute of Health at Charité - Universitätsmedizin Berlin, BCRT, Berlin, Germany
| | - Lars Wittler
- Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Yiwen Zhu
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | | | - Daniel M Ibrahim
- Max Planck Institute for Molecular Genetics, Berlin, Germany
- Berlin Institute of Health at Charité - Universitätsmedizin Berlin, BCRT, Berlin, Germany
| | - Ingo Kurth
- Institute for Human Genetics and Genomic Medicine, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Uwe Kornak
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
| | - Axel Visel
- Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | | | - David R Beier
- Brotman Baty Institute for Precision Medicine, University of Washington, Seattle, WA, USA
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, Seattle, WA, USA
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - Cole Trapnell
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Brotman Baty Institute for Precision Medicine, University of Washington, Seattle, WA, USA
- Allen Discovery Center for Cell Lineage Tracing, Seattle, WA, USA
| | - Junyue Cao
- Laboratory of Single-Cell Genomics and Population Dynamics, The Rockefeller University, New York, NY, USA.
| | - Jay Shendure
- Department of Genome Sciences, University of Washington, Seattle, WA, USA.
- Brotman Baty Institute for Precision Medicine, University of Washington, Seattle, WA, USA.
- Allen Discovery Center for Cell Lineage Tracing, Seattle, WA, USA.
- Howard Hughes Medical Institute, Seattle, WA, USA.
| | - Malte Spielmann
- Institute of Human Genetics, University Medical Center Schleswig-Holstein, University of Lübeck & Kiel University, Lübeck, Germany.
- Max Planck Institute for Molecular Genetics, Berlin, Germany.
- DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Lübeck/Kiel, Lübeck, Germany.
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6
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Shafagh Shishavan N, Morovvati S. A novel deletion mutation in the ATP6V0A2 gene in an Iranian patient affected by autosomal recessive cutis laxa. Ir J Med Sci 2023; 192:2279-2282. [PMID: 36520350 DOI: 10.1007/s11845-022-03246-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 12/02/2022] [Indexed: 12/23/2022]
Abstract
Cutis laxa (CL) can be caused by mutations in a number of genes. Cutis laxa with autosomal recessive inheritance due to mutations in several genes, including mutations in the ATP6V0A2 gene, causes autosomal recessive cutis laxa type 2A (ARCL2A). The ATP6V0A2 gene encodes the a2 subunit in the V-ATPases pump. The V-ATPases are located in the membrane of some organelles, including the Golgi or some vesicles, and act as ATP-dependent proton pumps to pH adjustment intracellular segments. Mutations in the ATP6V0A2 gene consist present in ARCL2A patients. We present the case of a 12-year-old girl who was referred to Rasad Laboratory (Tehran, Iran) at the age of 5 with a set of symptoms of congenital disorders. Her clinical phenotype contains distal symmetrical sensory and motor polyneuropathy, loose joints, large nasal roots, growth delay, and wrinkled skin. Also, there was a history of the parental marriage of consanguinity. A potentially pathogenic homozygous deletion mutation was detected in the ATP6V0A2 gene related to ARCL2A. This mutation has not been reported in the other patients with ARCL2A. A novel homozygous deletion mutation in ATP6V0A2 is supposed to be the reason for disease in our proband.
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Affiliation(s)
- Negar Shafagh Shishavan
- Department of Genetics, Faculty of Advanced Sciences and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
- Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
| | - Saeid Morovvati
- Department of Genetics, Faculty of Advanced Sciences and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
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7
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Indrawinata K, Argiropoulos P, Sugita S. Structural and functional understanding of disease-associated mutations in V-ATPase subunit a1 and other isoforms. Front Mol Neurosci 2023; 16:1135015. [PMID: 37465367 PMCID: PMC10352029 DOI: 10.3389/fnmol.2023.1135015] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 06/09/2023] [Indexed: 07/20/2023] Open
Abstract
The vacuolar-type ATPase (V-ATPase) is a multisubunit protein composed of the cytosolic adenosine triphosphate (ATP) hydrolysis catalyzing V1 complex, and the integral membrane complex, Vo, responsible for proton translocation. The largest subunit of the Vo complex, subunit a, enables proton translocation upon ATP hydrolysis, mediated by the cytosolic V1 complex. Four known subunit a isoforms (a1-a4) are expressed in different cellular locations. Subunit a1 (also known as Voa1), the neural isoform, is strongly expressed in neurons and is encoded by the ATP6V0A1 gene. Global knockout of this gene in mice causes embryonic lethality, whereas pyramidal neuron-specific knockout resulted in neuronal cell death with impaired spatial and learning memory. Recently reported, de novo and biallelic mutations of the human ATP6V0A1 impair autophagic and lysosomal activities, contributing to neuronal cell death in developmental and epileptic encephalopathies (DEE) and early onset progressive myoclonus epilepsy (PME). The de novo heterozygous R740Q mutation is the most recurrent variant reported in cases of DEE. Homology studies suggest R740 deprotonates protons from specific glutamic acid residues in subunit c, highlighting its importance to the overall V-ATPase function. In this paper, we discuss the structure and mechanism of the V-ATPase, emphasizing how mutations in subunit a1 can lead to lysosomal and autophagic dysfunction in neurodevelopmental disorders, and how mutations to the non-neural isoforms, a2-a4, can also lead to various genetic diseases. Given the growing discovery of disease-causing variants of V-ATPase subunit a and its function as a pump-based regulator of intracellular organelle pH, this multiprotein complex warrants further investigation.
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Affiliation(s)
- Karen Indrawinata
- Division of Translational and Experimental Neuroscience, Krembil Brain Institute, University Health Network, Toronto, ON, Canada
| | - Peter Argiropoulos
- Division of Translational and Experimental Neuroscience, Krembil Brain Institute, University Health Network, Toronto, ON, Canada
| | - Shuzo Sugita
- Division of Translational and Experimental Neuroscience, Krembil Brain Institute, University Health Network, Toronto, ON, Canada
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
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8
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Tuli F, Kane PM. The cytosolic N-terminal domain of V-ATPase a-subunits is a regulatory hub targeted by multiple signals. Front Mol Biosci 2023; 10:1168680. [PMID: 37398550 PMCID: PMC10313074 DOI: 10.3389/fmolb.2023.1168680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 06/05/2023] [Indexed: 07/04/2023] Open
Abstract
Vacuolar H+-ATPases (V-ATPases) acidify several organelles in all eukaryotic cells and export protons across the plasma membrane in a subset of cell types. V-ATPases are multisubunit enzymes consisting of a peripheral subcomplex, V1, that is exposed to the cytosol and an integral membrane subcomplex, Vo, that contains the proton pore. The Vo a-subunit is the largest membrane subunit and consists of two domains. The N-terminal domain of the a-subunit (aNT) interacts with several V1 and Vo subunits and serves to bridge the V1 and Vo subcomplexes, while the C-terminal domain contains eight transmembrane helices, two of which are directly involved in proton transport. Although there can be multiple isoforms of several V-ATPase subunits, the a-subunit is encoded by the largest number of isoforms in most organisms. For example, the human genome encodes four a-subunit isoforms that exhibit a tissue- and organelle-specific distribution. In the yeast S. cerevisiae, the two a-subunit isoforms, Golgi-enriched Stv1 and vacuolar Vph1, are the only V-ATPase subunit isoforms. Current structural information indicates that a-subunit isoforms adopt a similar backbone structure but sequence variations allow for specific interactions during trafficking and in response to cellular signals. V-ATPases are subject to several types of environmental regulation that serve to tune their activity to their cellular location and environmental demands. The position of the aNT domain in the complex makes it an ideal target for modulating V1-Vo interactions and regulating enzyme activity. The yeast a-subunit isoforms have served as a paradigm for dissecting interactions of regulatory inputs with subunit isoforms. Importantly, structures of yeast V-ATPases containing each a-subunit isoform are available. Chimeric a-subunits combining elements of Stv1NT and Vph1NT have provided insights into how regulatory inputs can be integrated to allow V-ATPases to support cell growth under different stress conditions. Although the function and distribution of the four mammalian a-subunit isoforms present additional complexity, it is clear that the aNT domains of these isoforms are also subject to multiple regulatory interactions. Regulatory mechanisms that target mammalian a-subunit isoforms, and specifically the aNT domains, will be described. Altered V-ATPase function is associated with multiple diseases in humans. The possibility of regulating V-ATPase subpopulations via their isoform-specific regulatory interactions are discussed.
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Affiliation(s)
| | - Patricia M. Kane
- Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, NY, United States
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Characterization of a PIP Binding Site in the N-Terminal Domain of V-ATPase a4 and Its Role in Plasma Membrane Association. Int J Mol Sci 2023; 24:ijms24054867. [PMID: 36902293 PMCID: PMC10002524 DOI: 10.3390/ijms24054867] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/13/2023] [Accepted: 02/21/2023] [Indexed: 03/06/2023] Open
Abstract
Vacuolar ATPases (V-ATPases) are multi-subunit ATP-dependent proton pumps necessary for cellular functions, including pH regulation and membrane fusion. The evidence suggests that the V-ATPase a-subunit's interaction with the membrane signaling lipid phosphatidylinositol (PIPs) regulates the recruitment of V-ATPase complexes to specific membranes. We generated a homology model of the N-terminal domain of the human a4 isoform (a4NT) using Phyre2.0 and propose a lipid binding domain within the distal lobe of the a4NT. We identified a basic motif, K234IKK237, critical for interaction with phosphoinositides (PIP), and found similar basic residue motifs in all four mammalian and both yeast a-isoforms. We tested PIP binding of wildtype and mutant a4NT in vitro. In protein lipid overlay assays, the double mutation K234A/K237A and the autosomal recessive distal renal tubular-causing mutation K237del reduced both PIP binding and association with liposomes enriched with PI(4,5)P2, a PIP enriched within plasma membranes. Circular dichroism spectra of the mutant protein were comparable to wildtype, indicating that mutations affected lipid binding, not protein structure. When expressed in HEK293, wildtype a4NT localized to the plasma membrane in fluorescence microscopy and co-purified with the microsomal membrane fraction in cellular fractionation experiments. a4NT mutants showed reduced membrane association and decreased plasma membrane localization. Depletion of PI(4,5)P2 by ionomycin caused reduced membrane association of the WT a4NT protein. Our data suggest that information contained within the soluble a4NT is sufficient for membrane association and that PI(4,5)P2 binding capacity is involved in a4 V-ATPase plasma membrane retention.
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10
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The a subunit isoforms of vacuolar-type proton ATPase exhibit differential distribution in mouse perigastrulation embryos. Sci Rep 2022; 12:13590. [PMID: 35948619 PMCID: PMC9365772 DOI: 10.1038/s41598-022-18002-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 08/03/2022] [Indexed: 11/25/2022] Open
Abstract
Vacuolar-type H+-ATPases (V-ATPases) are large multi-subunit complexes that play critical roles in the acidification of a variety of intracellular or extracellular compartments. Mammalian cells contain four isoforms of the membrane integral subunit a (a1–a4); these isoforms contain the information necessary to target the enzyme to different cellular destinations. They are also involved in regulating the efficiency of ATP hydrolysis and proton transport. Previously, we showed that early embryogenesis requires V-ATPase function, and the luminal acidic endocytic and lysosomal compartments in the visceral endoderm of mouse embryos at the pre-gastrulation stage (E6.5) are essential for both nutrition and signal transduction during early embryogenesis. In this study, we examined the expression and distribution of a subunit isoforms in mouse embryos at E6.5. We found that all four isoforms expressed and exhibited differential distribution in the E6.5 embryo. At this developmental stage, the embryos establish highly elaborate endocytic compartments called apical vacuoles, on which the a3 isoform specifically accumulated.
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11
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Beyens A, Pottie L, Sips P, Callewaert B. Clinical and Molecular Delineation of Cutis Laxa Syndromes: Paradigms for Homeostasis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1348:273-309. [PMID: 34807425 DOI: 10.1007/978-3-030-80614-9_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Cutis laxa (CL) syndromes are a large and heterogeneous group of rare connective tissue disorders that share loose redundant skin as a hallmark clinical feature, which reflects dermal elastic fiber fragmentation. Both acquired and congenital-Mendelian- forms exist. Acquired forms are progressive and often preceded by inflammatory triggers in the skin, but may show systemic elastolysis. Mendelian forms are often pleiotropic in nature and classified upon systemic manifestations and mode of inheritance. Though impaired elastogenesis is a common denominator in all Mendelian forms of CL, the underlying gene defects are diverse and affect structural components of the elastic fiber or impair metabolic pathways interfering with cellular trafficking, proline synthesis, or mitochondrial functioning. In this chapter we provide a detailed overview of the clinical and molecular characteristics of the different cutis laxa types and review the latest insights on elastic fiber assembly and homeostasis from both human and animal studies.
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Affiliation(s)
- Aude Beyens
- Center for Medical Genetics Ghent, Department of Dermatology, Department of Biomolecular Medicine, Ghent University Hospital, Ghent University, Ghent, Belgium
| | - Lore Pottie
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Patrick Sips
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Bert Callewaert
- Center for Medical Genetics Ghent, Department of Biomolecular Medicine, Ghent University Hospital, Ghent University, Ghent, Belgium.
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12
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Oot RA, Yao Y, Manolson MF, Wilkens S. Purification of active human vacuolar H +-ATPase in native lipid-containing nanodiscs. J Biol Chem 2021; 297:100964. [PMID: 34270960 PMCID: PMC8353480 DOI: 10.1016/j.jbc.2021.100964] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 07/07/2021] [Accepted: 07/12/2021] [Indexed: 12/26/2022] Open
Abstract
Vacuolar H+-ATPases (V-ATPases) are large, multisubunit proton pumps that acidify the lumen of organelles in virtually every eukaryotic cell and in specialized acid-secreting animal cells, the enzyme pumps protons into the extracellular space. In higher organisms, most of the subunits are expressed as multiple isoforms, with some enriched in specific compartments or tissues and others expressed ubiquitously. In mammals, subunit a is expressed as four isoforms (a1-4) that target the enzyme to distinct biological membranes. Mutations in a isoforms are known to give rise to tissue-specific disease, and some a isoforms are upregulated and mislocalized to the plasma membrane in invasive cancers. However, isoform complexity and low abundance greatly complicate purification of active human V-ATPase, a prerequisite for developing isoform-specific therapeutics. Here, we report the purification of an active human V-ATPase in native lipid nanodiscs from a cell line stably expressing affinity-tagged a isoform 4 (a4). We find that exogenous expression of this single subunit in HEK293F cells permits assembly of a functional V-ATPase by incorporation of endogenous subunits. The ATPase activity of the preparation is >95% sensitive to concanamycin A, indicating that the lipid nanodisc-reconstituted enzyme is functionally coupled. Moreover, this strategy permits purification of the enzyme's isolated membrane subcomplex together with biosynthetic assembly factors coiled-coil domain-containing protein 115, transmembrane protein 199, and vacuolar H+-ATPase assembly integral membrane protein 21. Our work thus lays the groundwork for biochemical characterization of active human V-ATPase in an a subunit isoform-specific manner and establishes a platform for the study of the assembly and regulation of the human holoenzyme.
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Affiliation(s)
- Rebecca A Oot
- Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, New York, USA
| | - Yeqi Yao
- Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | - Morris F Manolson
- Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | - Stephan Wilkens
- Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, New York, USA.
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13
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Vogt G, El Choubassi N, Herczegfalvi Á, Kölbel H, Lekaj A, Schara U, Holtgrewe M, Krause S, Horvath R, Schuelke M, Hübner C, Mundlos S, Roos A, Lochmüller H, Karcagi V, Kornak U, Fischer‐Zirnsak B. Expanding the clinical and molecular spectrum of ATP6V1A related metabolic cutis laxa. J Inherit Metab Dis 2021; 44:972-986. [PMID: 33320377 PMCID: PMC8638669 DOI: 10.1002/jimd.12341] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 12/08/2020] [Accepted: 12/14/2020] [Indexed: 12/14/2022]
Abstract
Several inborn errors of metabolism show cutis laxa as a highly recognizable feature. One group of these metabolic cutis laxa conditions is autosomal recessive cutis laxa type 2 caused by defects in v-ATPase components or the mitochondrial proline cycle. Besides cutis laxa, muscular hypotonia and cardiac abnormalities are hallmarks of autosomal recessive cutis laxa type 2D (ARCL2D) due to pathogenic variants in ATP6V1A encoding subunit A of the v-ATPase. Here, we report on three affected individuals from two families with ARCL2D in whom we performed whole exome and Sanger sequencing. We performed functional studies in fibroblasts from one individual, summarized all known probands' clinical, molecular, and biochemical features and compared them, also to other metabolic forms of cutis laxa. We identified novel missense and the first nonsense variant strongly affecting ATP6V1A expression. All six ARCL2D affected individuals show equally severe cutis laxa and dysmorphism at birth. While for one no information was available, two died in infancy and three are now adolescents with mild or absent intellectual disability. Muscular weakness, ptosis, contractures, and elevated muscle enzymes indicated a persistent myopathy. In cellular studies, a fragmented Golgi compartment, a delayed Brefeldin A-induced retrograde transport and glycosylation abnormalities were present in fibroblasts from two individuals. This is the second and confirmatory report on pathogenic variants in ATP6V1A as the cause of this extremely rare condition and the first to describe a nonsense allele. Our data highlight the tremendous clinical variability of ATP6V1A related phenotypes even within the same family.
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Affiliation(s)
- Guido Vogt
- Institut für Medizinische Genetik und Humangenetik, Charité ‐ Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
- Max Planck Institute for Molecular Genetics, RG Development & DiseaseBerlinGermany
| | - Naji El Choubassi
- Institut für Medizinische Genetik und Humangenetik, Charité ‐ Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
- Max Planck Institute for Molecular Genetics, RG Development & DiseaseBerlinGermany
| | - Ágnes Herczegfalvi
- Department of Pediatric NeurologySemmelweis Medical University, II. Pediatric ClinicBudapestHungary
| | - Heike Kölbel
- Department of Pediatric NeurologyUniversity Hospital Essen, University Duisburg‐EssenEssenGermany
| | - Anja Lekaj
- Institut für Medizinische Genetik und Humangenetik, Charité ‐ Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
| | - Ulrike Schara
- Department of Pediatric NeurologyUniversity Hospital Essen, University Duisburg‐EssenEssenGermany
| | - Manuel Holtgrewe
- CUBI – Core Unit BioinformaticsBerlin Institute of HealthBerlinGermany
| | - Sabine Krause
- Friedrich‐Baur‐Institute, Department of NeurologyLudwig‐Maximilians‐University of MunichMunichGermany
| | - Rita Horvath
- Department of Clinical NeurosciencesUniversity of Cambridge, Cambridge Biomedical CampusCambridgeUK
| | - Markus Schuelke
- Department of Neuropediatrics, Charité‐Universitätsmedizin Berlincorporate member of Freie Universität Berlin, Humboldt‐Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
| | - Christoph Hübner
- Department of Neuropediatrics, Charité‐Universitätsmedizin Berlincorporate member of Freie Universität Berlin, Humboldt‐Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
| | - Stefan Mundlos
- Institut für Medizinische Genetik und Humangenetik, Charité ‐ Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
- Max Planck Institute for Molecular Genetics, RG Development & DiseaseBerlinGermany
| | - Andreas Roos
- Department of Pediatric NeurologyUniversity Hospital Essen, University Duisburg‐EssenEssenGermany
- Children's Hospital of Eastern Ontario Research InstituteUniversity of OttawaOttawaOntarioCanada
| | - Hanns Lochmüller
- Children's Hospital of Eastern Ontario Research InstituteUniversity of OttawaOttawaOntarioCanada
- Division of Neurology, Department of Medicine, The Ottawa HospitalOttawaCanada
- Brain and Mind Research InstituteUniversity of OttawaOttawaCanada
| | - Veronika Karcagi
- NIEH, Department of Molecular Genetics and DiagnosticsBudapestHungary
- Istenhegyi Genetic Diagnostic CentreBudapestHungary
| | - Uwe Kornak
- Institut für Medizinische Genetik und Humangenetik, Charité ‐ Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
- Max Planck Institute for Molecular Genetics, RG Development & DiseaseBerlinGermany
- Institute of Human GeneticsUniversity Medical Center GöttingenGöttingenGermany
| | - Björn Fischer‐Zirnsak
- Institut für Medizinische Genetik und Humangenetik, Charité ‐ Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of HealthBerlinGermany
- Max Planck Institute for Molecular Genetics, RG Development & DiseaseBerlinGermany
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14
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Pottie L, Van Gool W, Vanhooydonck M, Hanisch FG, Goeminne G, Rajkovic A, Coucke P, Sips P, Callewaert B. Loss of zebrafish atp6v1e1b, encoding a subunit of vacuolar ATPase, recapitulates human ARCL type 2C syndrome and identifies multiple pathobiological signatures. PLoS Genet 2021; 17:e1009603. [PMID: 34143769 PMCID: PMC8244898 DOI: 10.1371/journal.pgen.1009603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 06/30/2021] [Accepted: 05/17/2021] [Indexed: 11/27/2022] Open
Abstract
The inability to maintain a strictly regulated endo(lyso)somal acidic pH through the proton-pumping action of the vacuolar-ATPases (v-ATPases) has been associated with various human diseases including heritable connective tissue disorders. Autosomal recessive (AR) cutis laxa (CL) type 2C syndrome is associated with genetic defects in the ATP6V1E1 gene and is characterized by skin wrinkles or loose redundant skin folds with pleiotropic systemic manifestations. The underlying pathological mechanisms leading to the clinical presentations remain largely unknown. Here, we show that loss of atp6v1e1b in zebrafish leads to early mortality, associated with craniofacial dysmorphisms, vascular anomalies, cardiac dysfunction, N-glycosylation defects, hypotonia, and epidermal structural defects. These features are reminiscent of the phenotypic manifestations in ARCL type 2C patients. Our data demonstrates that loss of atp6v1e1b alters endo(lyso)somal protein levels, and interferes with non-canonical v-ATPase pathways in vivo. In order to gain further insights into the processes affected by loss of atp6v1e1b, we performed an untargeted analysis of the transcriptome, metabolome, and lipidome in early atp6v1e1b-deficient larvae. We report multiple affected pathways including but not limited to oxidative phosphorylation, sphingolipid, fatty acid, and energy metabolism together with profound defects on mitochondrial respiration. Taken together, our results identify complex pathobiological effects due to loss of atp6v1e1b in vivo. Cutis laxa syndromes are pleiotropic disorders of the connective tissue, characterized by skin redundancy and variable systemic manifestations. Cutis laxa syndromes are caused by pathogenic variants in genes encoding structural and regulatory components of the extracellular matrix or in genes encoding components of cellular trafficking, metabolism, and mitochondrial function. Pathogenic variants in genes coding for vacuolar-ATPases, a multisubunit complex responsible for the acidification of multiple intracellular vesicles, cause type 2 cutis laxa syndromes, a group of cutis laxa subtypes further characterized by neurological, skeletal, and rarely cardiopulmonary manifestations. To investigate the pathomechanisms of vacuolar-ATPase dysfunction, we generated zebrafish models that lack a crucial subunit of the vacuolar-ATPases. The mutant zebrafish models show morphological and functional features reminiscent of the phenotypic manifestations in cutis laxa patients carrying pathogenic variants in ATP6V1E1. In-depth analysis at multiple -omic levels identified biological signatures that indicate impairment of signaling pathways, lipid metabolism, and mitochondrial respiration. We anticipate that these data will contribute to a better understanding of the pathogenesis of cutis laxa syndromes and other disorders involving defective v-ATPase function, which may eventually improve patient treatment and management.
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Affiliation(s)
- Lore Pottie
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Wouter Van Gool
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Michiel Vanhooydonck
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Franz-Georg Hanisch
- Institute of Biochemistry II, Medical Faculty, University of Cologne, Cologne, Germany
| | - Geert Goeminne
- VIB Metabolomics Core Ghent, Ghent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium
| | - Andreja Rajkovic
- Department of Food technology, Safety and Health, Faculty of Bioscience Engineering, University of Ghent, Ghent, Belgium
| | - Paul Coucke
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Patrick Sips
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Bert Callewaert
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium
- Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
- * E-mail:
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15
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Morlino S, Nardella G, Castellana S, Micale L, Copetti M, Fusco C, Castori M. Review of clinical and molecular variability in autosomal recessive cutis laxa 2A. Am J Med Genet A 2020; 185:955-965. [PMID: 33369135 DOI: 10.1002/ajmg.a.62047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 11/10/2020] [Accepted: 12/13/2020] [Indexed: 11/06/2022]
Abstract
ATP6V0A2-related cutis laxa, also known as autosomal recessive cutis laxa type 2A (ARCL2A), is a subtype of hereditary cutis laxa originally characterized by skin, skeletal, and neurological involvement, and a combined defect of N-glycosylation and O-glycosylation. The associated clinical spectrum subsequently expanded to a less severe phenotype dominated by cutaneous involvement. At the moment, ARCL2A was described in a few case reports and series only. An Italian adult woman ARCL2A with a phenotype restricted to skin and the two novel c.3G>C and c.1101dup ATP6V0A2 variants has been reported. A systematic literature review allowed us to identify 69 additional individuals from 64 families. Available data were scrutinized in order to describe the clinical and molecular variability of ARCL2A. About 78.3% of known variants were predicted null alleles, while 11 were missense and 2 affected noncanonical splice sites. Age at ascertainment appeared as the unique phenotypic discriminator with earlier age more commonly associated with facial dysmorphism (p .02), high/cleft palate (p .005), intellectual disability/global developmental delay (p .013), and seizures (p .024). No specific genotype-phenotype correlations were identified. This work confirmed the existence of an attenuated phenotype associated with ATP6V0A2 biallelic variants and offers an updated critique to the clinical and molecular variability of ARCL2A.
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Affiliation(s)
- Silvia Morlino
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Grazia Nardella
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Stefano Castellana
- Unit of Bioinformatics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Lucia Micale
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Massimiliano Copetti
- Unit of Biostatistics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Carmela Fusco
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
| | - Marco Castori
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy
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16
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González-Domínguez CA, López-Valdez J, Martínez-Duncker Ramírez I, Salinas-Marín R. Análisis de la mutación c.187 C>T en el gen ATP6V0A2 mediante PCR-ARMS. TIP REVISTA ESPECIALIZADA EN CIENCIAS QUÍMICO-BIOLÓGICAS 2020. [DOI: 10.22201/fesz.23958723e.2020.0.262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Los desórdenes congénitos de la glicosilación (CDG) son enfermedades poco frecuentes (EPOF) de tipo metabólico y hereditarias que ocurren como consecuencia de mutaciones en los genes que codifican para proteínas que participan, directa o indirectamente, en este proceso. La enfermedad clínicamente denominada Cutis Laxa Autosómica Recesiva tipo II-A (ARCL2A) es un tipo de CDG (ATP6V0A2-CDG) causado por mutaciones en ATP6V0A2, que codifica para la subunidad a2 del dominio v0 de una ATPasa vacuolar que tiene como función el transporte de iones H+ a través de las membranas celulares, regulando así el pH de los compartimentos celulares, e incluye la acidificación del aparato de Golgi. En 2014, nuestro grupo de investigación reportó por primera vez en México, la existencia de dos pacientes con ATP6V0A2-CDG. En este trabajo, se estableció una metodología para identificar a los portadores de la mutación c.187 C>T en el ATP6V0A2 mediante PCR-ARMS.
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17
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Beyens A, Boel A, Symoens S, Callewaert B. Cutis laxa: A comprehensive overview of clinical characteristics and pathophysiology. Clin Genet 2020; 99:53-66. [PMID: 33058140 DOI: 10.1111/cge.13865] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 09/17/2020] [Accepted: 10/07/2020] [Indexed: 12/20/2022]
Abstract
Cutis laxa (CL) syndromes comprise a rare group of multisystem disorders that share loose redundant skin folds as hallmark clinical feature. CL results from impaired elastic fiber assembly and homeostasis, and the known underlying gene defects affect different extracellular matrix proteins, intracellular trafficking, or cellular metabolism. Due to the underlying clinical and molecular heterogeneity, the diagnostic work-up of CL patients is often challenging. In this review, we provide a practical approach to the broad differential diagnosis of CL syndromes, provide an overview of the molecular pathogenesis of the different subtypes, and suggest general management guidelines.
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Affiliation(s)
- Aude Beyens
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium.,Department of Dermatology, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Annekatrien Boel
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Sofie Symoens
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Bert Callewaert
- Center for Medical Genetics Ghent, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
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18
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Bonnycastle K, Davenport EC, Cousin MA. Presynaptic dysfunction in neurodevelopmental disorders: Insights from the synaptic vesicle life cycle. J Neurochem 2020; 157:179-207. [PMID: 32378740 DOI: 10.1111/jnc.15035] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 04/14/2020] [Accepted: 04/22/2020] [Indexed: 12/11/2022]
Abstract
The activity-dependent fusion, retrieval and recycling of synaptic vesicles is essential for the maintenance of neurotransmission. Until relatively recently it was believed that most mutations in genes that were essential for this process would be incompatible with life, because of this fundamental role. However, an ever-expanding number of mutations in this very cohort of genes are being identified in individuals with neurodevelopmental disorders, including autism, intellectual disability and epilepsy. This article will summarize the current state of knowledge linking mutations in presynaptic genes to neurodevelopmental disorders by sequentially covering the various stages of the synaptic vesicle life cycle. It will also discuss how perturbations of specific stages within this recycling process could translate into human disease. Finally, it will also provide perspectives on the potential for future therapy that are targeted to presynaptic function.
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Affiliation(s)
- Katherine Bonnycastle
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK.,Muir Maxwell Epilepsy Centre, University of Edinburgh, Edinburgh, UK.,Simons Initiative for the Developing Brain, University of Edinburgh, Edinburgh, UK
| | - Elizabeth C Davenport
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK.,Muir Maxwell Epilepsy Centre, University of Edinburgh, Edinburgh, UK.,Simons Initiative for the Developing Brain, University of Edinburgh, Edinburgh, UK
| | - Michael A Cousin
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK.,Muir Maxwell Epilepsy Centre, University of Edinburgh, Edinburgh, UK.,Simons Initiative for the Developing Brain, University of Edinburgh, Edinburgh, UK
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19
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Hou X, Chen X, Yang H, Yue W, Wang J, Han H, Wang C. V-ATPase subunit B plays essential roles in the molting process of the Chinese mitten crab, Eriocheir sinensis. Biol Open 2020; 9:bio048926. [PMID: 32434771 PMCID: PMC7272352 DOI: 10.1242/bio.048926] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 04/27/2020] [Indexed: 11/23/2022] Open
Abstract
Vacuolar ATPase (V-ATPase) is a proton pump driven by ATP hydrolysis, and it plays an important role in numerous biological processes, such as protein degradation and synthesis, cell growth, and cell autophagy. The V-ATPase subunit B (VATB) is a conservative and regulatory subunit required for ATP hydrolysis during proton pumping. The VATB of Eriocheirsinensis (EsVATB), which includes an open reading frame (ORF) length of 1467 bp encoding 489 amino acids, was cloned to unveil the biological function of VATB during the molting process of crustaceans. Spatial and temporal expression profiles showed that EsVATB was highly expressed in the posterior gill accompanied with the highest osmotic pressure in the premolt (PrM) stage. Meanwhile, the highest expression level of EsVATB was identified in the hepatopancreas and heart during the postmolt stage and epidermis in the intermolt stage, indicating that EsVATB may perform diverse biological functions in different tissues during the molting process. The individual crabs in the interference group showed a high mortality rate (74%) and a low molting rate (26%) and failed to form a new epicuticle in the PrM stage. Meanwhile, a significant difference in osmotic pressure was identified between the interference and control groups. Our results indicate that EsVATB is an indispensable functional gene that may participate in osmoregulation and help with the new epicuticle formation during the molting process of E. sinensis.
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Affiliation(s)
- Xin Hou
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, 201306, China
- Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai, 201306, China
| | - Xiaowen Chen
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, 201306, China
- Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai, 201306, China
| | - He Yang
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China
| | - Wucheng Yue
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, 201306, China
- Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai, 201306, China
| | - Jun Wang
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, 201306, China
- Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai, 201306, China
| | - Hua Han
- Department of Pharmacy, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Chenghui Wang
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, 201306, China
- Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai, 201306, China
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20
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Fassio A, Esposito A, Kato M, Saitsu H, Mei D, Marini C, Conti V, Nakashima M, Okamoto N, Olmez Turker A, Albuz B, Semerci Gündüz CN, Yanagihara K, Belmonte E, Maragliano L, Ramsey K, Balak C, Siniard A, Narayanan V, Ohba C, Shiina M, Ogata K, Matsumoto N, Benfenati F, Guerrini R. De novo mutations of the ATP6V1A gene cause developmental encephalopathy with epilepsy. Brain 2019; 141:1703-1718. [PMID: 29668857 PMCID: PMC5972584 DOI: 10.1093/brain/awy092] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 02/10/2018] [Indexed: 12/30/2022] Open
Abstract
V-type proton (H+) ATPase (v-ATPase) is a multi-subunit proton pump that regulates pH homeostasis in all eukaryotic cells; in neurons, v-ATPase plays additional and unique roles in synapse function. Through whole exome sequencing, we identified de novo heterozygous mutations (p.Pro27Arg, p.Asp100Tyr, p.Asp349Asn, p.Asp371Gly) in ATP6V1A, encoding the A subunit of v-ATPase, in four patients with developmental encephalopathy with epilepsy. Early manifestations, observed in all patients, were developmental delay and febrile seizures, evolving to encephalopathy with profound delay, hypotonic/dyskinetic quadriparesis and intractable multiple seizure types in two patients (p.Pro27Arg, p.Asp100Tyr), and to moderate delay with milder epilepsy in the other two (p.Asp349Asn, p.Asp371Gly). Modelling performed on the available prokaryotic and eukaryotic structures of v-ATPase predicted p.Pro27Arg to perturb subunit interaction, p.Asp100Tyr to cause steric hindrance and destabilize protein folding, p.Asp349Asn to affect the catalytic function and p.Asp371Gly to impair the rotation process, necessary for proton transport. We addressed the impact of p.Asp349Asn and p.Asp100Tyr mutations on ATP6V1A expression and function by analysing ATP6V1A-overexpressing HEK293T cells and patients’ lymphoblasts. The p.Asp100Tyr mutant was characterized by reduced expression due to increased degradation. Conversely, no decrease in expression and clearance was observed for p.Asp349Asn. In HEK293T cells overexpressing either pathogenic or control variants, p.Asp349Asn significantly increased LysoTracker® fluorescence with no effects on EEA1 and LAMP1 expression. Conversely, p.Asp100Tyr decreased both LysoTracker® fluorescence and LAMP1 levels, leaving EEA1 expression unaffected. Both mutations decreased v-ATPase recruitment to autophagosomes, with no major impact on autophagy. Experiments performed on patients’ lymphoblasts using the LysoSensor™ probe revealed lower pH of endocytic organelles for p.Asp349Asn and a reduced expression of LAMP1 with no effect on the pH for p.Asp100Tyr. These data demonstrate gain of function for p.Asp349Asn characterized by an increased proton pumping in intracellular organelles, and loss of function for p.Asp100Tyr with decreased expression of ATP6V1A and reduced levels of lysosomal markers. We expressed p.Asp349Asn and p.Asp100Tyr in rat hippocampal neurons and confirmed significant and opposite effects in lysosomal labelling. However, both mutations caused a similar defect in neurite elongation accompanied by loss of excitatory inputs, revealing that altered lysosomal homeostasis markedly affects neurite development and synaptic connectivity. This study provides evidence that de novo heterozygous ATP6V1A mutations cause a developmental encephalopathy with a pathomechanism that involves perturbations of lysosomal homeostasis and neuronal connectivity, uncovering a novel role for v-ATPase in neuronal development.
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Affiliation(s)
- Anna Fassio
- Department of Experimental Medicine, University of Genoa, Genoa, Italy.,Center of Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Alessandro Esposito
- Department of Experimental Medicine, University of Genoa, Genoa, Italy.,Center of Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Mitsuhiro Kato
- Department of Paediatrics, Showa University School of Medicine, Tokyo, Japan
| | - Hirotomo Saitsu
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Davide Mei
- Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Children's Hospital A. Meyer-University of Florence, Florence, Italy
| | - Carla Marini
- Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Children's Hospital A. Meyer-University of Florence, Florence, Italy
| | - Valerio Conti
- Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Children's Hospital A. Meyer-University of Florence, Florence, Italy
| | - Mitsuko Nakashima
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Japan.,Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Nobuhiko Okamoto
- Department of Medical Genetics, Osaka Women's and Children's Hospital, Osaka, Japan
| | | | - Burcu Albuz
- Department of Medical Genetics, Pamukkale University Hospital, Denizli, Turkey
| | | | - Keiko Yanagihara
- Department of Paediatric Neurology, Osaka Women's and Children's Hospital, Osaka, Japan
| | - Elisa Belmonte
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
| | - Luca Maragliano
- Center of Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Keri Ramsey
- Center for Rare Childhood Disorders and Neurogenomics Division Translational Genomics Research Institute, Phoenix, Arizona 85004, USA
| | - Chris Balak
- Center for Rare Childhood Disorders and Neurogenomics Division Translational Genomics Research Institute, Phoenix, Arizona 85004, USA
| | - Ashley Siniard
- Center for Rare Childhood Disorders and Neurogenomics Division Translational Genomics Research Institute, Phoenix, Arizona 85004, USA
| | - Vinodh Narayanan
- Center for Rare Childhood Disorders and Neurogenomics Division Translational Genomics Research Institute, Phoenix, Arizona 85004, USA
| | | | - Chihiro Ohba
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Masaaki Shiina
- Department of Biochemistry, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Kazuhiro Ogata
- Department of Biochemistry, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Fabio Benfenati
- Department of Experimental Medicine, University of Genoa, Genoa, Italy.,Center of Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Renzo Guerrini
- Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Children's Hospital A. Meyer-University of Florence, Florence, Italy.,IRCCS Fondazione Stella Maris, Pisa, Italy
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21
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Ritelli M, Cammarata-Scalisi F, Cinquina V, Colombi M. Clinical and molecular characterization of an 18-month-old infant with autosomal recessive cutis laxa type 1C due to a novel LTBP4 pathogenic variant, and literature review. Mol Genet Genomic Med 2019; 7:e00735. [PMID: 31115174 PMCID: PMC6625097 DOI: 10.1002/mgg3.735] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/11/2019] [Accepted: 04/22/2019] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Cutis laxa (CL) is a group of rare connective tissue disorders mainly characterized by wrinkled, redundant, inelastic, and sagging skin. Besides skin anomalies, in most CL forms multiple organs are involved, leading to severe multisystem disorders involving skeletal, cardiovascular, pulmonary, and central nervous systems. CL might be challenging to diagnose because of its different inheritance patterns, extensive phenotypic variability, and genetic heterogeneity. Herein, we report the clinical and molecular characterization of an 18-month-old infant with signs suggestive of recessive cutis laxa type 1C (ARCL1C), although with a relatively mild presentation. METHODS To confirm the clinical suspicion, mutational screening of all the exons and intron-flanking regions of the latent transforming growth factor-beta binding protein 4 gene (LTBP4) was performed by Sanger sequencing on an ABI3130XL Genetic Analyzer. RESULTS Apart from the presence of the dermatological hallmark, the reported patient did not show pulmonary emphysema, which is the most common and discriminative finding of ARCL1C together with gastrointestinal and urinary involvement. Indeed, pulmonary involvement only included episodes of respiratory distress and diaphragmatic eventration; intestinal dilation and tortuosity and hydronephrosis were also present. Molecular analysis disclosed the novel homozygous c.1450del (p.Arg484Glyfs*290) pathogenic variant in exon 12 of LTBP4, thus leading to the diagnosis of ARCL1C. CONCLUSION Our findings expand both the knowledge of the clinical phenotype and the allelic repertoire of ARCL1C. The comparison of the patient's features with those of the other patients reported up to now offers future perspectives for clinical research in this field.
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Affiliation(s)
- Marco Ritelli
- Division of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Francisco Cammarata-Scalisi
- Unit of Medical Genetics, Department of Pediatrics, Faculty of Medicine, University of the Andes, Mérida, Venezuela
| | - Valeria Cinquina
- Division of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Marina Colombi
- Division of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
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22
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Fischer-Zirnsak B, Koenig R, Alisch F, Güneş N, Hausser I, Saha N, Beck-Woedl S, Haack TB, Thiel C, Kamrath C, Tüysüz B, Henning S, Mundlos S, Hoffmann K, Horn D, Kornak U. SOPH syndrome in three affected individuals showing similarities with progeroid cutis laxa conditions in early infancy. J Hum Genet 2019; 64:609-616. [DOI: 10.1038/s10038-019-0602-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/26/2019] [Accepted: 04/05/2019] [Indexed: 02/08/2023]
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23
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Despres J, Ramdani Y, di Giovanni M, Bénard M, Zahid A, Montero-Hadjadje M, Yvergnaux F, Saguet T, Driouich A, Follet-Gueye ML. Replicative senescence of human dermal fibroblasts affects structural and functional aspects of the Golgi apparatus. Exp Dermatol 2019; 28:922-932. [DOI: 10.1111/exd.13886] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 12/14/2018] [Accepted: 01/02/2019] [Indexed: 01/02/2023]
Affiliation(s)
- Julie Despres
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale; Normandie Université; UNIROUEN, Fédération de recherche Normandie-Végétal - FED 4277, GDR CNRS 3711, COSM'ACTIFS; Mont-Saint-Aignan France
- Bioeurope; Groupe SOLABIA; Route d'OulinsAnet France
| | - Yasmina Ramdani
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale; Normandie Université; UNIROUEN, Fédération de recherche Normandie-Végétal - FED 4277, GDR CNRS 3711, COSM'ACTIFS; Mont-Saint-Aignan France
| | - Marine di Giovanni
- Cell Imaging Platform (PRIMACEN-IRIB); Normandie Université; UNIROUEN; Mont-Saint-Aignan France
| | - Magalie Bénard
- Cell Imaging Platform (PRIMACEN-IRIB); Normandie Université; UNIROUEN; Mont-Saint-Aignan France
| | - Abderrakib Zahid
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale; Normandie Université; UNIROUEN, Fédération de recherche Normandie-Végétal - FED 4277, GDR CNRS 3711, COSM'ACTIFS; Mont-Saint-Aignan France
| | - Maité Montero-Hadjadje
- Laboratoire de Différenciation et Communication Neuronale et Neuroendocrine; Institut de Recherche et d'Innovation Biomédicale de Normandie; Normandie Univ; UNIROUEN; INSERM U1239; Rouen France
| | | | | | - Azeddine Driouich
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale; Normandie Université; UNIROUEN, Fédération de recherche Normandie-Végétal - FED 4277, GDR CNRS 3711, COSM'ACTIFS; Mont-Saint-Aignan France
- Cell Imaging Platform (PRIMACEN-IRIB); Normandie Université; UNIROUEN; Mont-Saint-Aignan France
| | - Marie-Laure Follet-Gueye
- Laboratoire Glycobiologie et Matrice Extracellulaire Végétale; Normandie Université; UNIROUEN, Fédération de recherche Normandie-Végétal - FED 4277, GDR CNRS 3711, COSM'ACTIFS; Mont-Saint-Aignan France
- Cell Imaging Platform (PRIMACEN-IRIB); Normandie Université; UNIROUEN; Mont-Saint-Aignan France
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24
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Karacan İ, Diz Küçükkaya R, Karakuş FN, Solakoğlu S, Tolun A, Hançer VS, Turanlı ET. A Novel ATP6V0A2 Mutation Causing Recessive Cutis Laxa with Unusual Manifestations of Bleeding Diathesis and Defective Wound Healing. Turk J Haematol 2018; 36:29-36. [PMID: 30474613 PMCID: PMC6373508 DOI: 10.4274/tjh.galenos.2018.2018.0325] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Objective: Autosomal recessive cutis laxa type IIA (ARCL2A) is a rare congenital disorder characterized by loose and elastic skin, growth and developmental delay, and skeletal anomalies. It is caused by biallelic mutations in ATP6V0A2. Those mutations lead to increased pH in secretory vesicles and thereby to impaired glycosyltransferase activity and organelle trafficking. We aimed to identify the genetic and molecular cause of the unexpected hematological findings in a Turkish family. Materials and Methods: We performed clinical, genetic, and histological analyses of a consanguineous family afflicted with wrinkled and loose skin, microcephaly, intellectual disability, cleft lip and palate, downslanting palpebral fissures, ectopia lentis, bleeding diathesis, and defective wound healing. Results: Linkage analysis using SNP genotype data yielded a maximal multipoint logarithm of odds score of 2.59 at 12q24.21-24.32. Exome sequence analysis for the proband led to the identification of novel homozygous frameshift c.2085_2088del (p.(Ser695Argfs*12)) in ATP6V0A2, within the linked region, in the two affected siblings. Conclusion: Our patients do not have gross structural brain defects besides microcephaly, strabismus, myopia, and growth or developmental delay. Large platelets were observed in the patients and unusual electron-dense intracytoplasmic inclusions in fibroblasts and epidermal basal cells were observed in both affected and unaffected family members. The patients do not have any genetic defect in the VWF gene but von Willebrand factor activity to antigen ratios were low. Clinical findings of bleeding diathesis and defective wound healing have not been reported in ARCL2A and hence our findings expand the phenotypic spectrum of the disease.
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Affiliation(s)
- İlker Karacan
- İstanbul Technical University, Graduate School of Science, Engineering and Technology, Department of Molecular Biology-Genetics and Biotechnology, İstanbul, Turkey,İstanbul Medeniyet University, Department of Molecular Biology and Genetics, İstanbul, Turkey
| | - Reyhan Diz Küçükkaya
- İstanbul Bilim University, Faculty of Medicine, Department of Hematology, İstanbul, Turkey
| | - Fatma Nur Karakuş
- İstanbul University, İstanbul Faculty of Medicine, Department of Histology and Embryology, İstanbul, Turkey
| | - Seyhun Solakoğlu
- İstanbul University, İstanbul Faculty of Medicine, Department of Histology and Embryology, İstanbul, Turkey
| | - Aslıhan Tolun
- Boğaziçi University, Department of Molecular Biology and Genetics, İstanbul, Turkey
| | - Veysel Sabri Hançer
- İstanbul Bilim University, Department of Molecular Biology and Genetics, İstanbul, Turkey
| | - Eda Tahir Turanlı
- İstanbul Technical University, Graduate School of Science, Engineering and Technology, Department of Molecular Biology-Genetics and Biotechnology, İstanbul, Turkey,İstanbul Technical University, Department of Molecular Biology and Genetics, İstanbul, Turkey
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25
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Duan X, Yang S, Zhang L, Yang T. V-ATPases and osteoclasts: ambiguous future of V-ATPases inhibitors in osteoporosis. Theranostics 2018; 8:5379-5399. [PMID: 30555553 PMCID: PMC6276090 DOI: 10.7150/thno.28391] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 10/10/2018] [Indexed: 12/11/2022] Open
Abstract
Vacuolar ATPases (V-ATPases) play a critical role in regulating extracellular acidification of osteoclasts and bone resorption. The deficiencies of subunit a3 and d2 of V-ATPases result in increased bone density in humans and mice. One of the traditional drug design strategies in treating osteoporosis is the use of subunit a3 inhibitor. Recent findings connect subunits H and G1 with decreased bone density. Given the controversial effects of ATPase subunits on bone density, there is a critical need to review the subunits of V-ATPase in osteoclasts and their functions in regulating osteoclasts and bone remodeling. In this review, we comprehensively address the following areas: information about all V-ATPase subunits and their isoforms; summary of V-ATPase subunits associated with human genetic diseases; V-ATPase subunits and osteopetrosis/osteoporosis; screening of all V-ATPase subunits variants in GEFOS data and in-house data; spectrum of V-ATPase subunits during osteoclastogenesis; direct and indirect roles of subunits of V-ATPases in osteoclasts; V-ATPase-associated signaling pathways in osteoclasts; interactions among V-ATPase subunits in osteoclasts; osteoclast-specific V-ATPase inhibitors; perspective of future inhibitors or activators targeting V-ATPase subunits in the treatment of osteoporosis.
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Affiliation(s)
- Xiaohong Duan
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Department of Oral Biology, Clinic of Oral Rare and Genetic Diseases, School of Stomatology, the Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, P. R. China
| | - Shaoqing Yang
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Department of Oral Biology, Clinic of Oral Rare and Genetic Diseases, School of Stomatology, the Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, P. R. China
| | - Lei Zhang
- Center for Genetic Epidemiology and Genomics, School of Public Health, Medical College of Soochow University, 199 Renai Road, Suzhou, Jiangsu, P. R. China
| | - Tielin Yang
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, and Institute of Molecular Genetics, School of Life Science and Technology, Xi'an Jiaotong University, 28 West Xianning Road, Xi'an 710049, People's Republic of China
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26
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Beyens A, Moreno-Artero E, Bodemer C, Cox H, Gezdirici A, Yilmaz Gulec E, Kahloul N, Khau Van Kien P, Ogur G, Harroche A, Vasse M, Salhi A, Symoens S, Hadj-Rabia S, Callewaert B. ATP6V0A2-related cutis laxa in 10 novel patients: Focus on clinical variability and expansion of the phenotype. Exp Dermatol 2018; 28:1142-1145. [PMID: 29952037 DOI: 10.1111/exd.13723] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/22/2018] [Indexed: 01/11/2023]
Abstract
In ATP6V0A2-related cutis laxa, the skin phenotype varies from a wrinkly skin to prominent cutis laxa and typically associates with skeletal and neurological manifestations. The phenotype remains incompletely characterized, especially in adult patients. Glycosylation defects and reduced acidification of secretory vesicles contribute to the pathogenesis, but the consequences at the clinical level remain to be determined. Moreover, the morphology of the elastic fibres has not been studied in ATP6V0A2-related cutis laxa, nor its relation with potential clinical risks. We report on the extreme variability in ATP6V0A2-related cutis laxa in 10 novel patients, expand the phenotype with emphysema and von Willebrand disease and hypothesize on the pathogenesis that might link both with deficiency of glycosylation and with elastic fibre anomalies. Our data will affect clinical management of patients with ATP6V0A2-related cutis laxa.
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Affiliation(s)
- Aude Beyens
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Ester Moreno-Artero
- Reference Centre for Genodermatoses and Rare Skin Diseases (MAGEC) & Department of Dermatology, Department of Paediatric Social Work, INSERM U1163 & Institut Imagine, Hôpital Universitaire Necker-Enfants Malades, APHP, Université Paris Descartes - Sorbonne Paris Cité, Paris, France
| | - Christine Bodemer
- Reference Centre for Genodermatoses and Rare Skin Diseases (MAGEC) & Department of Dermatology, Department of Paediatric Social Work, INSERM U1163 & Institut Imagine, Hôpital Universitaire Necker-Enfants Malades, APHP, Université Paris Descartes - Sorbonne Paris Cité, Paris, France
| | - Helen Cox
- West Midlands Regional Clinical Genetics Service, Clinical Genetics Unit, Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK
| | - Alper Gezdirici
- Department of Medical Genetics, Kanuni Sultan Suleyman Training and Research Hospital, Health Sciences University, Istanbul, Turkey
| | - Elif Yilmaz Gulec
- Department of Medical Genetics, Kanuni Sultan Suleyman Training and Research Hospital, Health Sciences University, Istanbul, Turkey
| | - Najoua Kahloul
- Center for Pediatrics, CHU Farhat Hached De Sousse, Sousse, Tunisia
| | - Philippe Khau Van Kien
- Department of Medical Genetics, Centre Hospitalier Régional Universitaire de Nîmes, Nîmes, France
| | - Gonul Ogur
- Department of Pediatric Genetics, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey
| | - Annie Harroche
- Service d'Hématologie Clinique, Centre de Traitement de l'Hémophilie, Hôpital Universitaire Necker-Enfants Malades, Paris, France
| | - Marc Vasse
- Department of Clinical Biology & INSERM UMR-S1176, Foch Hospital, Suresnes, Le Kremlin-Bicêtre, France
| | - Aïcha Salhi
- Service de Dermatologie, Faculté de Médecine d'Alger, Université d'Alger, Alger, Algeria
| | - Sofie Symoens
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Smail Hadj-Rabia
- Reference Centre for Genodermatoses and Rare Skin Diseases (MAGEC) & Department of Dermatology, Department of Paediatric Social Work, INSERM U1163 & Institut Imagine, Hôpital Universitaire Necker-Enfants Malades, APHP, Université Paris Descartes - Sorbonne Paris Cité, Paris, France
| | - Bert Callewaert
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
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27
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Girard M, Poujois A, Fabre M, Lacaille F, Debray D, Rio M, Fenaille F, Cholet S, Ruel C, Caussé E, Selves J, Bridoux-Henno L, Woimant F, Dupré T, Vuillaumier-Barrot S, Seta N, Alric L, de Lonlay P, Bruneel A. CCDC115-CDG: A new rare and misleading inherited cause of liver disease. Mol Genet Metab 2018; 124:228-235. [PMID: 29759592 DOI: 10.1016/j.ymgme.2018.05.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 05/07/2018] [Accepted: 05/07/2018] [Indexed: 01/06/2023]
Abstract
Congenital disorders of glycosylation (CDG) linked to defects in Golgi apparatus homeostasis constitute an increasing part of these rare inherited diseases. Among them, COG-CDG, ATP6V0A2-CDG, TMEM199-CDG and CCDC115-CDG have been shown to disturb Golgi vesicular trafficking and/or lumen pH acidification. Here, we report 3 new unrelated cases of CCDC115-CDG with emphasis on diagnosis difficulties related to strong phenotypic similarities with mitochondriopathies, Niemann-Pick disease C and Wilson Disease. Indeed, while two individuals clinically presented with early and severe liver fibrosis and cirrhosis associated with neurological symptoms, the other one "only" showed isolated and late severe liver involvement. Biological results were similar to previously described patients, including hypercholesterolemia, elevated alkaline phosphatases and defects in copper metabolism. CDG screening and glycosylation study finally led to the molecular diagnosis of CCDC115-CDG. Besides pointing to the importance of CDG screening in patients with unexplained and severe liver disease, these reports expand the clinical and molecular phenotypes of CCDC115-CDG. The hepatic involvement is particularly addressed. Furthermore, hypothesis concerning the pathogenesis of the liver disease and of major biological abnormalities are proposed.
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Affiliation(s)
- Muriel Girard
- AP-HP, Necker University Hospital, Hepatology and Gastroenterology Unit, French National Reference Centre for Biliary Atresia and Genetic Cholestasis, France; Paris Descartes University, France
| | - Aurélia Poujois
- AP-HP, French National Reference Centre for Wilson Disease, Neurology Department, Lariboisière Hospital, Paris, France
| | - Monique Fabre
- AP-HP, Necker University Hospital, Department of Pathology, Paris, France
| | - Florence Lacaille
- AP-HP, Necker University Hospital, Hepatology and Gastroenterology Unit, French National Reference Centre for Biliary Atresia and Genetic Cholestasis, France
| | - Dominique Debray
- AP-HP, Necker University Hospital, Hepatology and Gastroenterology Unit, French National Reference Centre for Biliary Atresia and Genetic Cholestasis, France
| | - Marlène Rio
- AP-HP, Necker University Hospital, Department of Genetics, Paris, France
| | - François Fenaille
- Service de Pharmacologie et d'Immunoanalyse (SPI), Laboratoire d'Etude du Métabolisme des Médicaments, CEA, INRA, Université Paris Saclay, MetaboHUB, F-91191 Gif-sur-Yvette, France
| | - Sophie Cholet
- Service de Pharmacologie et d'Immunoanalyse (SPI), Laboratoire d'Etude du Métabolisme des Médicaments, CEA, INRA, Université Paris Saclay, MetaboHUB, F-91191 Gif-sur-Yvette, France
| | - Coralie Ruel
- Service de Pharmacologie et d'Immunoanalyse (SPI), Laboratoire d'Etude du Métabolisme des Médicaments, CEA, INRA, Université Paris Saclay, MetaboHUB, F-91191 Gif-sur-Yvette, France; Institut Galien Paris-Sud, UMR CNRS 8612, Proteins and Nanotechnology in Analytical Science (PNAS), Université Paris-Sud, Châtenay-Malabry, France
| | | | - Janick Selves
- Department of Pathology, University Hospital Toulouse, Paul Sabatier University, Toulouse, France
| | | | - France Woimant
- AP-HP, French National Reference Centre for Wilson Disease, Neurology Department, Lariboisière Hospital, Paris, France
| | - Thierry Dupré
- AP-HP, Bichat University Hospital, Biochemistry, Paris, France
| | | | - Nathalie Seta
- AP-HP, Bichat University Hospital, Biochemistry, Paris, France; Paris Descartes University, France
| | - Laurent Alric
- Internal Medicine-Digestive Department CHU Purpan, UMR152 IRD Toulouse 3 University, France
| | - Pascale de Lonlay
- AP-HP, Necker University Hospital, French National Reference Centre for Inborn Errors of Metabolism, Paris, France
| | - Arnaud Bruneel
- AP-HP, Bichat University Hospital, Biochemistry, Paris, France; INSERM UMR-1193 "Mécanismes cellulaires et moléculaires de l'adaptation au stress et cancérogenèse", Université Paris-Sud, Châtenay-Malabry, France.
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28
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Pamarthy S, Kulshrestha A, Katara GK, Beaman KD. The curious case of vacuolar ATPase: regulation of signaling pathways. Mol Cancer 2018; 17:41. [PMID: 29448933 PMCID: PMC5815226 DOI: 10.1186/s12943-018-0811-3] [Citation(s) in RCA: 107] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 02/07/2018] [Indexed: 02/06/2023] Open
Abstract
The Vacuolar ATPase (V-ATPase) is a proton pump responsible for controlling the intracellular and extracellular pH of cells. The structure of V-ATPase has been highly conserved among all eukaryotic cells and is involved in diverse functions across species. V-ATPase is best known for its acidification of endosomes and lysosomes and is also important for luminal acidification of specialized cells. Several reports have suggested the involvement of V-ATPase in maintaining an alkaline intracellular and acidic extracellular pH thereby aiding in proliferation and metastasis of cancer cells respectively. Increased expression of V-ATPase and relocation to the plasma membrane aids in cancer modulates key tumorigenic cell processes like autophagy, Warburg effect, immunomoduation, drug resistance and most importantly cancer cell signaling. In this review, we discuss the direct role of V-ATPase in acidification and indirect regulation of signaling pathways, particularly Notch Signaling.
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Affiliation(s)
- Sahithi Pamarthy
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL, 60064, USA
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL, 60611, USA
| | - Arpita Kulshrestha
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL, 60064, USA
| | - Gajendra K Katara
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL, 60064, USA
| | - Kenneth D Beaman
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL, 60064, USA.
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Esmail S, Kartner N, Yao Y, Kim JW, Reithmeier RAF, Manolson MF. Molecular mechanisms of cutis laxa- and distal renal tubular acidosis-causing mutations in V-ATPase a subunits, ATP6V0A2 and ATP6V0A4. J Biol Chem 2018; 293:2787-2800. [PMID: 29311258 DOI: 10.1074/jbc.m117.818872] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 12/20/2017] [Indexed: 12/19/2022] Open
Abstract
The a subunit is the largest of 15 different subunits that make up the vacuolar H+-ATPase (V-ATPase) complex, where it functions in proton translocation. In mammals, this subunit has four paralogous isoforms, a1-a4, which may encode signals for targeting assembled V-ATPases to specific intracellular locations. Despite the functional importance of the a subunit, its structure remains controversial. By studying molecular mechanisms of human disease-causing missense mutations within a subunit isoforms, we may identify domains critical for V-ATPase targeting, activity and/or regulation. cDNA-encoded FLAG-tagged human wildtype ATP6V0A2 (a2) and ATP6V0A4 (a4) subunits and their mutants, a2P405L (causing cutis laxa), and a4R449H and a4G820R (causing renal tubular acidosis, dRTA), were transiently expressed in HEK 293 cells. N-Glycosylation was assessed using endoglycosidases, revealing that a2P405L, a4R449H, and a4G820R were fully N-glycosylated. Cycloheximide (CHX) chase assays revealed that a2P405L and a4R449H were unstable relative to wildtype. a4R449H was degraded predominantly in the proteasomal pathway, whereas a2P405L was degraded in both proteasomal and lysosomal pathways. Immunofluorescence studies disclosed retention in the endoplasmic reticulum and defective cell-surface expression of a4R449H and defective Golgi trafficking of a2P405L Co-immunoprecipitation studies revealed an increase in association of a4R449H with the V0 assembly factor VMA21, and a reduced association with the V1 sector subunit, ATP6V1B1 (B1). For a4G820R, where stability, degradation, and trafficking were relatively unaffected, 3D molecular modeling suggested that the mutation causes dRTA by blocking the proton pathway. This study provides critical information that may assist rational drug design to manage dRTA and cutis laxa.
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Affiliation(s)
- Sally Esmail
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1G6
| | - Norbert Kartner
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1G6
| | - Yeqi Yao
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1G6
| | - Joo Wan Kim
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1G6
| | | | - Morris F Manolson
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1G6; Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
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30
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Katara GK, Kulshrestha A, Mao L, Wang X, Sahoo M, Ibrahim S, Pamarthy S, Suzue K, Shekhawat GS, Gilman-Sachs A, Beaman KD. Mammary epithelium-specific inactivation of V-ATPase reduces stiffness of extracellular matrix and enhances metastasis of breast cancer. Mol Oncol 2017; 12:208-223. [PMID: 29178186 PMCID: PMC5792725 DOI: 10.1002/1878-0261.12159] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 09/25/2017] [Accepted: 11/07/2017] [Indexed: 01/01/2023] Open
Abstract
Extracellular matrix (ECM) critically impacts tumor progression and is influenced by both cancer and host tissue cells. While our understanding of cancer cell ECM remodeling is widespread, the importance of host tissue ECM, which provides initial congenial environment for primary tumor formation, is partly understood. Here, we report a novel role of epithelial cell-associated vacuolar ATPase 'a2' isoform (a2V) in regulating breast tissue ECM stiffness to control metastasis. Using a mammary gland-specific a2V-knockout model, we show that in the absence of a2V, breast tumors exhibit atypically soft tumor phenotype, less tumor rigidity, and necrotic tumor microenvironment. These tumors contain a decreased number of cancer cells at primary tumor site, but showed extensive metastases compared to control. Nanomechanical evaluation of normal breast tissues revealed a decrease in stiffness and collagen content in ECM of a2V-deleted breast tissues. Mechanistically, inhibition of a2V expression caused dispersed Golgi morphology with relocation of glycosyltransferase enzymes to early endosomes in mammary epithelial cells. This resulted in defective glycosylation of ECM proteins and production of compromised ECM that further influenced tumor metastasis. Clinically, in patients with cancer, low a2V expression levels in normal breast tissue correlated with lymph node metastasis. Thus, using a new knockout mouse model, we have identified a2V expression in epithelial cells as a key requirement for proper ECM formation in breast tissue and its expression levels can significantly modulate breast tumor dissemination. Evaluation of a2V expression in normal breast tissues can help in identifying patients with high risk of developing metastases.
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Affiliation(s)
- Gajendra K Katara
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Arpita Kulshrestha
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Liqun Mao
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Xin Wang
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - Manoranjan Sahoo
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Safaa Ibrahim
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Sahithi Pamarthy
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Kimiko Suzue
- Department of Pathology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA.,Advocate Lutheran General Hospital, Park Ridge, IL, USA
| | - Gajendra S Shekhawat
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - Alice Gilman-Sachs
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Kenneth D Beaman
- Department of Microbiology and Immunology, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
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31
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Huang S, Wang Y. Golgi structure formation, function, and post-translational modifications in mammalian cells. F1000Res 2017; 6:2050. [PMID: 29225785 PMCID: PMC5710388 DOI: 10.12688/f1000research.11900.1] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/20/2017] [Indexed: 01/04/2023] Open
Abstract
The Golgi apparatus is a central membrane organelle for trafficking and post-translational modifications of proteins and lipids in cells. In mammalian cells, it is organized in the form of stacks of tightly aligned flattened cisternae, and dozens of stacks are often linked laterally into a ribbon-like structure located in the perinuclear region of the cell. Proper Golgi functionality requires an intact architecture, yet Golgi structure is dynamically regulated during the cell cycle and under disease conditions. In this review, we summarize our current understanding of the relationship between Golgi structure formation, function, and regulation, with focus on how post-translational modifications including phosphorylation and ubiquitination regulate Golgi structure and on how Golgi unstacking affects its functions, in particular, protein trafficking, glycosylation, and sorting in mammalian cells.
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Affiliation(s)
- Shijiao Huang
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
| | - Yanzhuang Wang
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
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32
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Kumar R, Sharda S, Soni V, Nambiyar K. Autosomal Recessive Cutis Laxa Type II: Report of Novel Mutation in a Child. Indian Dermatol Online J 2017; 8:352-354. [PMID: 28979870 PMCID: PMC5621197 DOI: 10.4103/idoj.idoj_334_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Autosomal recessive cutis laxa type-II (ARCLII) is a spectrum of clinical disorders with prenatal and postnatal growth retardation, cutis laxa, dysmorphism, and skeletal abnormalities. We report the case of a 14-month-old boy with developmental delay, hypotonia, dysmorphism, and loose skin. A novel homozygous variant was observed in ATP6VOA2 gene. Clinical spectrum of ARCLII is highly heterogeneous and molecular analysis should be done to confirm the diagnosis.
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Affiliation(s)
- Rakesh Kumar
- Department of Paediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Sheetal Sharda
- Department of Paediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Vimlesh Soni
- Department of Paediatrics, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Kaniyappan Nambiyar
- Department of Histopathology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
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33
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Banerjee S, Kane PM. Direct interaction of the Golgi V-ATPase a-subunit isoform with PI(4)P drives localization of Golgi V-ATPases in yeast. Mol Biol Cell 2017; 28:2518-2530. [PMID: 28720663 PMCID: PMC5597324 DOI: 10.1091/mbc.e17-05-0316] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 07/03/2017] [Accepted: 07/14/2017] [Indexed: 12/11/2022] Open
Abstract
PI(4)P directly interacts with the cytosolic domain of yeast Golgi vacuolar H+-ATPase (V-ATPase) a-isoform, Stv1, and the human Golgi a-subunit isoform. Lys-84 of Stv1 is essential for PI(4)P interaction, and localization of Stv1-containing V-ATPases in vivo requires the PI(4)P interaction. We propose that phosphatidylinositol binding exerts organelle-specific control over V-ATPases. Luminal pH and phosphoinositide content are fundamental features of organelle identity. Vacuolar H+-ATPases (V-ATPases) drive organelle acidification in all eukaryotes, and membrane-bound a-subunit isoforms of the V-ATPase are implicated in organelle-specific targeting and regulation. Earlier work demonstrated that the endolysosomal lipid PI(3,5)P2 activates V-ATPases containing the vacuolar a-subunit isoform in Saccharomyces cerevisiae. Here we demonstrate that PI(4)P, the predominant Golgi phosphatidylinositol (PI) species, directly interacts with the cytosolic amino terminal (NT) domain of the yeast Golgi V-ATPase a-isoform Stv1. Lysine-84 of Stv1NT is essential for interaction with PI(4)P in vitro and in vivo, and interaction with PI(4)P is required for efficient localization of Stv1-containing V-ATPases. The cytosolic NT domain of the human V-ATPase a2 isoform specifically interacts with PI(4)P in vitro, consistent with its Golgi localization and function. We propose that NT domains of Vo a-subunit isoforms interact specifically with PI lipids in their organelles of residence. These interactions can transmit organelle-specific targeting or regulation information to V-ATPases.
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Affiliation(s)
- Subhrajit Banerjee
- Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, NY 13210
| | - Patricia M Kane
- Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, NY 13210
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Discriminative Features in Three Autosomal Recessive Cutis Laxa Syndromes: Cutis Laxa IIA, Cutis Laxa IIB, and Geroderma Osteoplastica. Int J Mol Sci 2017; 18:ijms18030635. [PMID: 28294978 PMCID: PMC5372648 DOI: 10.3390/ijms18030635] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 02/28/2017] [Accepted: 03/06/2017] [Indexed: 01/10/2023] Open
Abstract
Cutis laxa is a heterogeneous condition characterized by redundant, sagging, inelastic, and wrinkled skin. The inherited forms of this disease are rare and can have autosomal dominant, autosomal recessive, or X-linked inheritance. Three of the autosomal recessive cutis laxa syndromes, namely cutis laxa IIA (ARCL2A), cutis laxa IIB (ARCL2B), and geroderma osteodysplastica (GO), have very similar clinical features, complicating accurate diagnosis. Individuals with these conditions often present with cutis laxa, progeroid features, and hyperextensible joints. These conditions also share additional features, such as short stature, hypotonia, and congenital hip dislocation, but the severity and frequency of these findings are variable in each of these cutis laxa syndromes. The characteristic features for ARCL2A are abnormal isoelectric focusing and facial features, including downslanting palpebral fissures and a long philtrum. Rather, the clinical phenotype of ARCL2B includes severe wrinkling of the dorsum of the hands and feet, wormian bones, athetoid movements, lipodystrophy, cataract and corneal clouding, a thin triangular face, and a pinched nose. Normal cognition and osteopenia leading to pathological fractures, maxillary hypoplasia, and oblique furrowing from the outer canthus to the lateral border of the supraorbital ridge are discriminative features for GO. Here we present 10 Iranian patients who were initially diagnosed clinically using the respective features of each cutis laxa syndrome. Each patient’s clinical diagnosis was then confirmed with molecular investigation of the responsible gene. Review of the clinical features from the cases reported from the literature also supports our conclusions.
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35
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Al Teneiji A, Bruun TUJ, Sidky S, Cordeiro D, Cohn RD, Mendoza-Londono R, Moharir M, Raiman J, Siriwardena K, Kyriakopoulou L, Mercimek-Mahmutoglu S. Phenotypic and genotypic spectrum of congenital disorders of glycosylation type I and type II. Mol Genet Metab 2017; 120:235-242. [PMID: 28122681 DOI: 10.1016/j.ymgme.2016.12.014] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 12/28/2016] [Accepted: 12/29/2016] [Indexed: 11/21/2022]
Abstract
BACKGROUND Congenital disorders of glycosylation (CDG) are inborn defects of glycan metabolism. They are multisystem disorders. Analysis of transferrin isoforms is applied as a screening test for CDG type I (CDG-I) and type II (CDG-II). We performed a retrospective cohort study to determine spectrum of phenotype and genotype and prevalence of the different subtypes of CDG-I and CDG-II. MATERIAL AND METHODS All patients with CDG-I and CDG-II evaluated in our institution's Metabolic Genetics Clinics were included. Electronic and paper patient charts were reviewed. We set-up a high performance liquid chromatography transferrin isoelectric focusing (TIEF) method to measure transferrin isoforms in our Institution. We reviewed the literature for the rare CDG-I and CDG-II subtypes seen in our Institution. RESULTS Fifteen patients were included: 9 with PMM2-CDG and 6 with non-PMM2-CDG (one ALG3-CDG, one ALG9-CDG, two ALG11-CDG, one MPDU1-CDG and one ATP6V0A2-CDG). All patients with PMM2-CDG and 5 patients with non-PMM2-CDG showed abnormal TIEF suggestive of CDG-I or CDG-II pattern. In all patients, molecular diagnosis was confirmed either by single gene testing, targeted next generation sequencing for CDG genes, or by whole exome sequencing. CONCLUSION We report 15 new patients with CDG-I and CDG-II. Whole exome sequencing will likely identify more patients with normal TIEF and expand the phenotypic spectrum of CDG-I and CDG-II.
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Affiliation(s)
- Amal Al Teneiji
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Theodora U J Bruun
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada; Genetics and Genome Biology Program, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada; Department of Biochemistry, University of Oxford, Oxford, United Kingdom
| | - Sarah Sidky
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Dawn Cordeiro
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Ronald D Cohn
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada; Genetics and Genome Biology Program, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Roberto Mendoza-Londono
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada; Genetics and Genome Biology Program, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Mahendranath Moharir
- Division of Neurology, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada
| | | | | | - Lianna Kyriakopoulou
- Division of Genome Diagnostics, Department of Paediatric Laboratory Medicine, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Saadet Mercimek-Mahmutoglu
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada; Genetics and Genome Biology Program, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada; Institute of Medical Sciences, University of Toronto, Toronto, Ontario, Canada.
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36
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Van Damme T, Gardeitchik T, Mohamed M, Guerrero-Castillo S, Freisinger P, Guillemyn B, Kariminejad A, Dalloyaux D, van Kraaij S, Lefeber DJ, Syx D, Steyaert W, De Rycke R, Hoischen A, Kamsteeg EJ, Wong SY, van Scherpenzeel M, Jamali P, Brandt U, Nijtmans L, Korenke GC, Chung BHY, Mak CCY, Hausser I, Kornak U, Fischer-Zirnsak B, Strom TM, Meitinger T, Alanay Y, Utine GE, Leung PKC, Ghaderi-Sohi S, Coucke P, Symoens S, De Paepe A, Thiel C, Haack TB, Malfait F, Morava E, Callewaert B, Wevers RA. Mutations in ATP6V1E1 or ATP6V1A Cause Autosomal-Recessive Cutis Laxa. Am J Hum Genet 2017; 100:216-227. [PMID: 28065471 DOI: 10.1016/j.ajhg.2016.12.010] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 12/08/2016] [Indexed: 02/03/2023] Open
Abstract
Defects of the V-type proton (H+) ATPase (V-ATPase) impair acidification and intracellular trafficking of membrane-enclosed compartments, including secretory granules, endosomes, and lysosomes. Whole-exome sequencing in five families affected by mild to severe cutis laxa, dysmorphic facial features, and cardiopulmonary involvement identified biallelic missense mutations in ATP6V1E1 and ATP6V1A, which encode the E1 and A subunits, respectively, of the V1 domain of the heteromultimeric V-ATPase complex. Structural modeling indicated that all substitutions affect critical residues and inter- or intrasubunit interactions. Furthermore, complexome profiling, a method combining blue-native gel electrophoresis and liquid chromatography tandem mass spectrometry, showed that they disturb either the assembly or the stability of the V-ATPase complex. Protein glycosylation was variably affected. Abnormal vesicular trafficking was evidenced by delayed retrograde transport after brefeldin A treatment and abnormal swelling and fragmentation of the Golgi apparatus. In addition to showing reduced and fragmented elastic fibers, the histopathological hallmark of cutis laxa, transmission electron microscopy of the dermis also showed pronounced changes in the structure and organization of the collagen fibers. Our findings expand the clinical and molecular spectrum of metabolic cutis laxa syndromes and further link defective extracellular matrix assembly to faulty protein processing and cellular trafficking caused by genetic defects in the V-ATPase complex.
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Affiliation(s)
- Tim Van Damme
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | - Thatjana Gardeitchik
- Department of Pediatrics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Department of Human Genetics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Miski Mohamed
- Department of Pediatrics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Sergio Guerrero-Castillo
- Radboud Center for Mitochondrial Medicine, Department of Pediatrics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Peter Freisinger
- Childrens' Hospital, Klinikum am Steinenberg, Reutlingen 72764, Germany
| | - Brecht Guillemyn
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | | | - Daisy Dalloyaux
- Department of Pediatrics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Sanne van Kraaij
- Department of Pediatrics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Dirk J Lefeber
- Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Department of Neurology, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Delfien Syx
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | - Wouter Steyaert
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | - Riet De Rycke
- Department of Biomedical Molecular Biology, Ghent University, Ghent 9000, Belgium; Inflammation Research Center, VIB, Ghent 9000, Belgium
| | - Alexander Hoischen
- Department of Human Genetics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Erik-Jan Kamsteeg
- Department of Human Genetics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Sunnie Y Wong
- Hayward Genetics Center, Tulane University Medical School, New Orleans, LA 70112, USA
| | - Monique van Scherpenzeel
- Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Department of Neurology, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Payman Jamali
- Shahrood Genetic Counseling Center, Semnan 36156, Iran
| | - Ulrich Brandt
- Radboud Center for Mitochondrial Medicine, Department of Pediatrics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - Leo Nijtmans
- Radboud Center for Mitochondrial Medicine, Department of Pediatrics, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands; Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands
| | - G Christoph Korenke
- Department of Neuropediatrics, Children's Hospital Klinikum Oldenburg, Oldenburg 26133, Germany
| | - Brian H Y Chung
- Department of Paediatrics & Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong, China
| | - Christopher C Y Mak
- Department of Paediatrics & Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong, China
| | - Ingrid Hausser
- Institute of Pathology, Universitätsklinikum Heidelberg, Heidelberg 69120, Germany
| | - Uwe Kornak
- Institute of Medical Genetics and Human Genetics, Charité - Universitaetsmedizin Berlin, Berlin 13353, Germany; Max Planck Institute for Molecular Genetics, Berlin 14195, Germany
| | - Björn Fischer-Zirnsak
- Institute of Medical Genetics and Human Genetics, Charité - Universitaetsmedizin Berlin, Berlin 13353, Germany; Max Planck Institute for Molecular Genetics, Berlin 14195, Germany
| | - Tim M Strom
- Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg 85764, Germany
| | - Thomas Meitinger
- Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg 85764, Germany
| | - Yasemin Alanay
- Pediatric Genetics Unit, Department of Pediatrics, Acibadem University School of Medicine, Istanbul 34752, Turkey
| | - Gulen E Utine
- Pediatric Genetics Unit, Department of Pediatrics, Ihsan Doğramacı Children's Hospital, Hacettepe School of Medicine, Ankara 06100, Turkey
| | - Peter K C Leung
- Department of Paediatrics & Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong, China
| | | | - Paul Coucke
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | - Sofie Symoens
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | - Anne De Paepe
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | - Christian Thiel
- Center for Child and Adolescent Medicine, Klinik Kinderheilkunde I, Universitätsklinikum Heidelberg, Heidelberg 69120, Germany
| | - Tobias B Haack
- Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg 85764, Germany; Institute of Human Genetics, Technische Universität München, Munich 81675, Germany; Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen 72076, Germany
| | - Fransiska Malfait
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium
| | - Eva Morava
- Hayward Genetics Center, Tulane University Medical School, New Orleans, LA 70112, USA; Department of Pediatrics, University Hospital Leuven, Leuven 3000, Belgium
| | - Bert Callewaert
- Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent 9000, Belgium.
| | - Ron A Wevers
- Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen 6500 HB, the Netherlands.
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Pamarthy S, Mao L, Katara GK, Fleetwood S, Kulshreshta A, Gilman-Sachs A, Beaman KD. The V-ATPase a2 isoform controls mammary gland development through Notch and TGF-β signaling. Cell Death Dis 2016; 7:e2443. [PMID: 27809299 PMCID: PMC5260869 DOI: 10.1038/cddis.2016.347] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 09/22/2016] [Accepted: 09/23/2016] [Indexed: 12/17/2022]
Abstract
Among all tissues and organs, the mammary gland is unique because most of its development occurs in adulthood. Notch signaling has a major role in mammary gland development and has been implicated in breast cancer. The vacuolar-ATPase (V-ATPase) is a proton pump responsible for the regulation and control of pH in intracellular vesicles and the extracellular milieu. We have previously reported that a2V-ATPase (a2V), an isoform of ‘a' subunit of V-ATPase, regulates processing of Notch receptor and alters Notch signaling in breast cancer. To study the role of a2V in mammary gland development, we generated an a2V-KO model (conditional mammary knockout a2V mouse strain). During normal mammary gland development, the basal level expression of a2V increased from puberty, virginity, and pregnancy through the lactation stage and then decreased during involution. Litters of a2V-KO mice weighed significantly less when compared with litters from wild-type mice and showed reduced expression of the lactation marker β-casein. Whole-mount analysis of mammary glands demonstrated impaired ductal elongation and bifurcation in a2V-KO mice. Consequently, we found disintegrated mammary epithelium as seen by basal and luminal epithelial staining, although the rate of proliferation remained unchanged. Delayed mammary morphogenesis in a2V-KO mice was associated with aberrant activation of Notch and TGF-β (transforming growth factor-β) pathways. Notably, Hey1 (hairy/enhancer-of-split related with YRPW motif) and Smad2, the key downstream mediators of Notch and TGF-β pathways, respectively, were upregulated in a2V-KO mice and also in human mammary epithelial cells treated with a2V siRNA. Taken together, our results show that a2V deficiency disrupts the endolysosomal route in Notch and TGF signaling, thereby impairing mammary gland development. Our findings have broader implications in developmental and oncogenic cellular environments where V-ATPase, Notch and TGF-β are crucial for cell survival.
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Affiliation(s)
- Sahithi Pamarthy
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA.,Division of Hematology and Oncology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Liquin Mao
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
| | - Gajendra K Katara
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
| | - Sara Fleetwood
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
| | - Arpita Kulshreshta
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
| | - Alice Gilman-Sachs
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
| | - Kenneth D Beaman
- Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
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38
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Cohen R, Halevy A, Aharoni S, Kraus D, Konen O, Basel-Vanagaite L, Goldberg-Stern H, Straussberg R. Polymicrogyria and myoclonic epilepsy in autosomal recessive cutis laxa type 2A. Neurogenetics 2016; 17:251-257. [PMID: 27631729 DOI: 10.1007/s10048-016-0491-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 08/17/2016] [Indexed: 11/27/2022]
Abstract
Cutis laxa syndromes are rare inherited disorders of skin and connective tissue metabolism associated with variable systemic involvement. The main clinical manifestation is loose, wrinkled, redundant, inelastic skin, hypotonia, typical facies including short nose and down-slanting palpebral fissures, and varying degrees of developmental delay. The aim of this report is to describe two siblings diagnosed with a moderate form of ATP6V0A2-related cutis laxa with polymicrogyria (cobblestone-like brain dysgenesis). One of the patients has myoclonic epilepsy which may have contributed to his more severe clinical presentation. The literature on cutis laxa syndromes is reviewed.
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Affiliation(s)
- Rony Cohen
- Department of Pediatric Neurology and Epilepsy Center, Schneider Children's Medical Center of Israel, Petach Tikva, 4920235, Israel. .,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Ayelet Halevy
- Department of Pediatric Neurology and Epilepsy Center, Schneider Children's Medical Center of Israel, Petach Tikva, 4920235, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sharon Aharoni
- Department of Pediatric Neurology and Epilepsy Center, Schneider Children's Medical Center of Israel, Petach Tikva, 4920235, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Dror Kraus
- Department of Pediatric Neurology and Epilepsy Center, Schneider Children's Medical Center of Israel, Petach Tikva, 4920235, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Osnat Konen
- Department of Radiology, Schneider Children's Medical Center of Israel, Petach Tikva, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Lina Basel-Vanagaite
- Pediatric Genetic Service, Schneider Children's Medical Center of Israel, Petach Tikva, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.,Raphael Recanati Genetics Institute, Rabin Medical Center - Beilinson Hospital, Petach Tikva, Israel
| | - Hadassa Goldberg-Stern
- Department of Pediatric Neurology and Epilepsy Center, Schneider Children's Medical Center of Israel, Petach Tikva, 4920235, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Rachel Straussberg
- Department of Pediatric Neurology and Epilepsy Center, Schneider Children's Medical Center of Israel, Petach Tikva, 4920235, Israel.,Pediatric Genetic Service, Schneider Children's Medical Center of Israel, Petach Tikva, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
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39
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Jansen J, Cirak S, van Scherpenzeel M, Timal S, Reunert J, Rust S, Pérez B, Vicogne D, Krawitz P, Wada Y, Ashikov A, Pérez-Cerdá C, Medrano C, Arnoldy A, Hoischen A, Huijben K, Steenbergen G, Quelhas D, Diogo L, Rymen D, Jaeken J, Guffon N, Cheillan D, van den Heuvel L, Maeda Y, Kaiser O, Schara U, Gerner P, van den Boogert M, Holleboom A, Nassogne MC, Sokal E, Salomon J, van den Bogaart G, Drenth J, Huynen M, Veltman J, Wevers R, Morava E, Matthijs G, Foulquier F, Marquardt T, Lefeber D. CCDC115 Deficiency Causes a Disorder of Golgi Homeostasis with Abnormal Protein Glycosylation. Am J Hum Genet 2016; 98:310-21. [PMID: 26833332 DOI: 10.1016/j.ajhg.2015.12.010] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 12/11/2015] [Indexed: 01/06/2023] Open
Abstract
Disorders of Golgi homeostasis form an emerging group of genetic defects. The highly heterogeneous clinical spectrum is not explained by our current understanding of the underlying cell-biological processes in the Golgi. Therefore, uncovering genetic defects and annotating gene function are challenging. Exome sequencing in a family with three siblings affected by abnormal Golgi glycosylation revealed a homozygous missense mutation, c.92T>C (p.Leu31Ser), in coiled-coil domain containing 115 (CCDC115), the function of which is unknown. The same mutation was identified in three unrelated families, and in one family it was compound heterozygous in combination with a heterozygous deletion of CCDC115. An additional homozygous missense mutation, c.31G>T (p.Asp11Tyr), was found in a family with two affected siblings. All individuals displayed a storage-disease-like phenotype involving hepatosplenomegaly, which regressed with age, highly elevated bone-derived alkaline phosphatase, elevated aminotransferases, and elevated cholesterol, in combination with abnormal copper metabolism and neurological symptoms. Two individuals died of liver failure, and one individual was successfully treated by liver transplantation. Abnormal N- and mucin type O-glycosylation was found on serum proteins, and reduced metabolic labeling of sialic acids was found in fibroblasts, which was restored after complementation with wild-type CCDC115. PSI-BLAST homology detection revealed reciprocal homology with Vma22p, the yeast V-ATPase assembly factor located in the endoplasmic reticulum (ER). Human CCDC115 mainly localized to the ERGIC and to COPI vesicles, but not to the ER. These data, in combination with the phenotypic spectrum, which is distinct from that associated with defects in V-ATPase core subunits, suggest a more general role for CCDC115 in Golgi trafficking. Our study reveals CCDC115 deficiency as a disorder of Golgi homeostasis that can be readily identified via screening for abnormal glycosylation in plasma.
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40
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Goyal M, Singh A, Kornak U, Kapoor S. The Diagnostic Dilemma of Cutis Laxa: A Report of Two Cases with Genotypic Dissimilarity. Indian J Dermatol 2015; 60:521. [PMID: 26538727 PMCID: PMC4601448 DOI: 10.4103/0019-5154.164434] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Cutis laxa is a heterogeneous group of diseases, with loose, wrinkled skin folds and hyperelasticity of the skin. There are overlapping of clinical features of the group of syndrome associated with cutis laxa, including congenital cutis laxa, wrinkly skin syndrome and gerodermia osteodysplastica. All these conditions present a challenge to the clinician. Thus, molecular diagnosis is the only way to resolve these phenotypically similar conditions. We hereby describe two Indian patients with wrinkled skin and mild craniofacial dysmorphic features who had molecular confirmation of autosomal recessive cutis laxa.
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Affiliation(s)
- Manisha Goyal
- Department of Pediatrics, Division of Genetics and Metabolism, Maulana Azad Medical College, New Delhi, India
| | - Ankur Singh
- Department of Pediatrics, Lady Harding Medical College and Associated Kalawati Saran Children Hospital, New Delhi, India
| | - Uwe Kornak
- Institute for Medical Genetics, Charité Universtaetsmedizin, Berlin, Germany
| | - Seema Kapoor
- Department of Pediatrics, Division of Genetics and Metabolism, Maulana Azad Medical College, New Delhi, India
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41
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Fischer-Zirnsak B, Escande-Beillard N, Ganesh J, Tan Y, Al Bughaili M, Lin A, Sahai I, Bahena P, Reichert S, Loh A, Wright G, Liu J, Rahikkala E, Pivnick E, Choudhri A, Krüger U, Zemojtel T, van Ravenswaaij-Arts C, Mostafavi R, Stolte-Dijkstra I, Symoens S, Pajunen L, Al-Gazali L, Meierhofer D, Robinson P, Mundlos S, Villarroel C, Byers P, Masri A, Robertson S, Schwarze U, Callewaert B, Reversade B, Kornak U. Recurrent De Novo Mutations Affecting Residue Arg138 of Pyrroline-5-Carboxylate Synthase Cause a Progeroid Form of Autosomal-Dominant Cutis Laxa. Am J Hum Genet 2015; 97:483-92. [PMID: 26320891 DOI: 10.1016/j.ajhg.2015.08.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 08/03/2015] [Indexed: 11/24/2022] Open
Abstract
Progeroid disorders overlapping with De Barsy syndrome (DBS) are collectively denoted as autosomal-recessive cutis laxa type 3 (ARCL3). They are caused by biallelic mutations in PYCR1 or ALDH18A1, encoding pyrroline-5-carboxylate reductase 1 and pyrroline-5-carboxylate synthase (P5CS), respectively, which both operate in the mitochondrial proline cycle. We report here on eight unrelated individuals born to non-consanguineous families clinically diagnosed with DBS or wrinkly skin syndrome. We found three heterozygous mutations in ALDH18A1 leading to amino acid substitutions of the same highly conserved residue, Arg138 in P5CS. A de novo origin was confirmed in all six probands for whom parental DNA was available. Using fibroblasts from affected individuals and heterologous overexpression, we found that the P5CS-p.Arg138Trp protein was stable and able to interact with wild-type P5CS but showed an altered sub-mitochondrial distribution. A reduced size upon native gel electrophoresis indicated an alteration of the structure or composition of P5CS mutant complex. Furthermore, we found that the mutant cells had a reduced P5CS enzymatic activity leading to a delayed proline accumulation. In summary, recurrent de novo mutations, affecting the highly conserved residue Arg138 of P5CS, cause an autosomal-dominant form of cutis laxa with progeroid features. Our data provide insights into the etiology of cutis laxa diseases and will have immediate impact on diagnostics and genetic counseling.
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42
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Vanakker O, Callewaert B, Malfait F, Coucke P. The Genetics of Soft Connective Tissue Disorders. Annu Rev Genomics Hum Genet 2015; 16:229-55. [DOI: 10.1146/annurev-genom-090314-050039] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Olivier Vanakker
- Center for Medical Genetics, Ghent University Hospital, 9000 Ghent, Belgium;
| | - Bert Callewaert
- Center for Medical Genetics, Ghent University Hospital, 9000 Ghent, Belgium;
| | - Fransiska Malfait
- Center for Medical Genetics, Ghent University Hospital, 9000 Ghent, Belgium;
| | - Paul Coucke
- Center for Medical Genetics, Ghent University Hospital, 9000 Ghent, Belgium;
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43
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Egerer J, Emmerich D, Fischer-Zirnsak B, Chan WL, Meierhofer D, Tuysuz B, Marschner K, Sauer S, Barr FA, Mundlos S, Kornak U. GORAB Missense Mutations Disrupt RAB6 and ARF5 Binding and Golgi Targeting. J Invest Dermatol 2015; 135:2368-2376. [PMID: 26000619 DOI: 10.1038/jid.2015.192] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 04/21/2015] [Accepted: 04/23/2015] [Indexed: 11/09/2022]
Abstract
Gerodermia osteodysplastica is a hereditary segmental progeroid disorder affecting skin, connective tissues, and bone that is caused by loss-of-function mutations in GORAB. The golgin, RAB6-interacting (GORAB) protein localizes to the Golgi apparatus and interacts with the small GTPase RAB6. In this study, we used different approaches to shed more light on the recruitment of GORAB to this compartment. We show that GORAB best colocalizes with trans-Golgi markers and is rapidly displaced upon Brefeldin A exposition, indicating a loose association with Golgi membranes. A yeast two-hybrid screening revealed a specific interaction with the small GTPase ADP-ribosylation factor (ARF5) in its active, GTP-bound form. ARF5 and RAB6 bind to GORAB via the same internal Golgi-targeting RAB6 and ARF5 binding (IGRAB) domain. Two GORAB missense mutations identified in gerodermia osteodysplastica patients fall within this IGRAB domain. GORAB carrying the mutation p.Ala220Pro had a cytoplasmic distribution and failed to interact with both RAB6 and ARF5. In contrast, the p.Ser175Phe mutation displaced GORAB from the Golgi compartment to vesicular structures and selectively impaired ARF5 binding. Our findings indicate that the IGRAB domain is crucial for the Golgi localization of GORAB and that loss of this localization impairs its physiological function.
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Affiliation(s)
- Johannes Egerer
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Berlin, Germany
| | - Denise Emmerich
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Berlin, Germany
| | - Björn Fischer-Zirnsak
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Berlin, Germany
| | - Wing Lee Chan
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Berlin, Germany
| | - David Meierhofer
- Max-Planck-Institut fuer Molekulare Genetik, Mass Spectrometry Facility, Berlin, Germany
| | - Beyhan Tuysuz
- Department of Pediatric Genetics, Cerrahpaşa Medical Faculty, Istanbul University, Istanbul, Turkey
| | - Katrin Marschner
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Berlin, Germany
| | - Sascha Sauer
- Max-Planck-Institut fuer Molekulare Genetik, Otto-Warburg-Laboratories, Berlin, Germany
| | - Francis A Barr
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Stefan Mundlos
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Berlin, Germany; Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité-Universitaetsmedizin Berlin, Berlin, Germany
| | - Uwe Kornak
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Berlin, Germany; Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité-Universitaetsmedizin Berlin, Berlin, Germany.
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44
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Congenital disorders of glycosylation: a concise chart of glycocalyx dysfunction. Trends Biochem Sci 2015; 40:377-84. [PMID: 25840516 DOI: 10.1016/j.tibs.2015.03.002] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 01/26/2015] [Accepted: 03/04/2015] [Indexed: 12/28/2022]
Abstract
Glycosylation is a ubiquitous modification of lipids and proteins. Despite the essential contribution of glycoconjugates to the viability of all living organisms, diseases of glycosylation in humans have only been identified over the past few decades. The recent development of next-generation DNA sequencing techniques has accelerated the pace of discovery of novel glycosylation defects. The description of multiple mutations across glycosylation pathways not only revealed tremendous diversity in functional impairments, but also pointed to phenotypic similarities, emphasizing the interconnected flow of substrates underlying glycan assembly. The current list of 100 known glycosylation disorders provides an overview of the significance of glycosylation in human development and physiology.
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45
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Abstract
Increased amyloid beta (Aβ) production by sequential cleavage of the amyloid precursor protein (APP) by the β- and γ-secretases contributes to the etiological basis of Alzheimer's disease (AD). This process requires APP and the secretases to be in the same subcellular compartments, such as the endosomes. Since all membrane organelles in the endomembrane system are kinetically and functionally linked, any defects in the trafficking and sorting machinery would be expected to change the functional properties of the whole system. The Golgi is a primary organelle for protein trafficking, sorting and modifications, and Golgi defects have been reported in AD. Here we hypothesize that Golgi fragmentation in AD accelerates APP trafficking and Aβ production. Furthermore, Golgi defects may perturb the proper trafficking and processing of many essential neuronal proteins, resulting in compromised neuronal function. Therefore, molecular tools that can restore Golgi structure and function could prove useful as potential drugs for AD treatment.
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Affiliation(s)
- Gunjan Joshi
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
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46
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Rymen D, Jaeken J. Skin manifestations in CDG. J Inherit Metab Dis 2014; 37:699-708. [PMID: 24554337 DOI: 10.1007/s10545-014-9678-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 12/01/2013] [Accepted: 01/20/2014] [Indexed: 10/25/2022]
Abstract
The group of congenital disorders of glycosylation (CDG) has expanded tremendously since its first description in 1980, with around 70 distinct disorders described to date. A great phenotypic variability exists, ranging from multisystem disease to single organ involvement. Skin manifestations, although inconsistently present, are part of this broad clinical spectrum. Indeed, the presence of inverted nipples, fat pads and orange peel skin in a patient with developmental delay are considered as a hallmark of CDG, particularly seen in PMM2 deficiency. However, over the years many more dermatological findings have been observed (e.g., ichthyosis, cutis laxa, tumoral calcinosis…). In this review we will discuss the variety of skin manifestations reported in CDG. Moreover, we will explore the possible mechanisms that link a certain glycosylation deficiency to its skin phenotype.
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Affiliation(s)
- D Rymen
- Center for Human Genetics, University of Leuven, Leuven, Belgium,
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47
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Fischer B, Callewaert B, Schröter P, Coucke PJ, Schlack C, Ott CE, Morroni M, Homann W, Mundlos S, Morava E, Ficcadenti A, Kornak U. Severe congenital cutis laxa with cardiovascular manifestations due to homozygous deletions in ALDH18A1. Mol Genet Metab 2014; 112:310-6. [PMID: 24913064 DOI: 10.1016/j.ymgme.2014.05.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 05/09/2014] [Accepted: 05/10/2014] [Indexed: 01/16/2023]
Abstract
Autosomal recessive cutis laxa (ARCL) type 2 constitutes a heterogeneous group of diseases mainly characterized by lax and wrinkled skin, skeletal anomalies, and a variable degree of intellectual disability. ALDH18A1-related ARCL is the most severe form within this disease spectrum. Here we report on the clinical and molecular findings of two affected individuals from two unrelated families. The patients presented with typical features of de Barsy syndrome and an overall progeroid appearance. However, the phenotype was highly variable including cardiovascular involvement in the more severe case. Investigation of a skin biopsy of one patient revealed not only the typical alterations of elastic fibers, but also an altered structure of mitochondria in cutaneous fibroblasts. Using conventional sequencing and copy number analysis we identified a frameshift deletion of one nucleotide and a microdeletion affecting the ALDH18A1 gene, respectively, in a homozygous state in both patients. Expression analysis in dermal fibroblasts from the patient carrying the microdeletion showed an almost complete absence of the ALDH18A1 mRNA resulting in an absence of the ALDH18A1 protein. So far, only 13 affected individuals from seven unrelated families suffering from ALDH18A1-related cutis laxa have been described in literature. Our findings provide new insights into the clinical spectrum and show that beside point mutations microdeletions are a possible cause of ALDH18A1-ARCL.
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Affiliation(s)
- Björn Fischer
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Ihnestr. 63-73, 14195 Berlin, Germany
| | - Bert Callewaert
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Phillipe Schröter
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Paul J Coucke
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Claire Schlack
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Claus-Eric Ott
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Ihnestr. 63-73, 14195 Berlin, Germany
| | - Manrico Morroni
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, School of Medicine, Università Politecnica delle Marche and Electron Microscopy Unit, United Hospitals, Ancona, Italy
| | - Wolfgang Homann
- Neonatologie, Christliches Kinderhospital Osnabrück, Osnabrück, Germany
| | - Stefan Mundlos
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Ihnestr. 63-73, 14195 Berlin, Germany; Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitaetsmedizin Berlin, Germany
| | - Eva Morava
- Tulane University Medical Center, Hayward Genetics Center, New Orleans, LA, USA
| | - Anna Ficcadenti
- Rare diseases Regional Centre, Pediatric Institute of Maternal-Infantile Sciences Department, Polytechnic University of Marche, Salesi Hospital of United Hospitals of Ancona, Italy
| | - Uwe Kornak
- Institut fuer Medizinische Genetik und Humangenetik, Charité-Universitaetsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; Max-Planck-Institut fuer Molekulare Genetik, FG Development & Disease, Ihnestr. 63-73, 14195 Berlin, Germany; Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitaetsmedizin Berlin, Germany.
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48
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Wolthuis DFGJ, van Asbeck E, Mohamed M, Gardeitchik T, Lim-Melia ER, Wevers RA, Morava E. Cutis laxa, fat pads and retinopathy due to ALDH18A1 mutation and review of the literature. Eur J Paediatr Neurol 2014; 18:511-5. [PMID: 24767728 DOI: 10.1016/j.ejpn.2014.01.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2013] [Revised: 01/12/2014] [Accepted: 01/19/2014] [Indexed: 10/25/2022]
Abstract
Autosomal recessive cutis laxa (ARCL) is a connective tissue disorder characterized by wrinkled, inelastic skin, frequently associated with a neurologic involvement and multisystem disease. Next generation sequencing was performed in genetically unsolved patients with progeroid features, neurological and eye involvement to assess the underlying etiology. We describe an 6 month old child, diagnosed with a novel, homozygous nonsense mutation c.2339T>C in exon 18 of the ALDH18A1 gene, and reviewed all reported P5CS patients. So far 10 patients were described with mutations in ALDH18A1. Features of our patient that have been described in literature included cutis laxa on hands and feet, visible veins on thorax and abdomen, joint laxity, failure to thrive, short stature, microcephaly, and severe developmental and speech delay. Furthermore, abnormal fat distribution, retinal abnormalities, undescended testis, and retinitis pigmentosa have never been described in ALDH18A1. Some features described as unique in ALDH18A1 have been observed in PYCR1 patients, thus suggesting that the phenotypic overlap is higher than previously shown. In conclusion, the clinical phenotype caused by ALDH18A1 mutations is diverse, with variable degree of progeria in children, but always in association with neurologic disease. We suggest genetic testing for possible ALDH18A1 mutations in all patients with progeroid features, like wrinkled or parchment-like skin, abnormal growth, especially with central nervous system involvement and microcephaly.
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Affiliation(s)
- David F G J Wolthuis
- Hayward Genetics Center, Tulane University Medical School, 1430 Tulane Ave, New Orleans, LA 70112, USA; Laboratory of Genetic, Metabolic and Endocrine Diseases, Radboud University Medical Centre Nijmegen, The Netherlands; Department of Pediatrics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Ellyze van Asbeck
- Hayward Genetics Center, Tulane University Medical School, 1430 Tulane Ave, New Orleans, LA 70112, USA; Laboratory of Genetic, Metabolic and Endocrine Diseases, Radboud University Medical Centre Nijmegen, The Netherlands; Department of Pediatrics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Miski Mohamed
- Hayward Genetics Center, Tulane University Medical School, 1430 Tulane Ave, New Orleans, LA 70112, USA; Laboratory of Genetic, Metabolic and Endocrine Diseases, Radboud University Medical Centre Nijmegen, The Netherlands; Department of Pediatrics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Thatjana Gardeitchik
- Hayward Genetics Center, Tulane University Medical School, 1430 Tulane Ave, New Orleans, LA 70112, USA; Laboratory of Genetic, Metabolic and Endocrine Diseases, Radboud University Medical Centre Nijmegen, The Netherlands; Department of Pediatrics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | | | - Ron A Wevers
- Laboratory of Genetic, Metabolic and Endocrine Diseases, Radboud University Medical Centre Nijmegen, The Netherlands
| | - Eva Morava
- Hayward Genetics Center, Tulane University Medical School, 1430 Tulane Ave, New Orleans, LA 70112, USA; Department of Pediatrics, Radboud University Medical Centre, Nijmegen, The Netherlands.
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49
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Gardeitchik T, Mohamed M, Fischer B, Lammens M, Lefeber D, Lace B, Parker M, Kim KJ, Lim BC, Häberle J, Garavelli L, Jagadeesh S, Kariminejad A, Guerra D, Leão M, Keski-Filppula R, Brunner H, Nijtmans L, van den Heuvel B, Wevers R, Kornak U, Morava E. Clinical and biochemical features guiding the diagnostics in neurometabolic cutis laxa. Eur J Hum Genet 2014; 22:888-95. [PMID: 23963297 PMCID: PMC4060105 DOI: 10.1038/ejhg.2013.154] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2012] [Revised: 06/11/2013] [Accepted: 06/12/2013] [Indexed: 01/01/2023] Open
Abstract
Patients with cutis laxa (CL) have wrinkled, sagging skin with decreased elasticity. Skin symptoms are associated with variable systemic involvement. The most common, genetically highly heterogeneous form of autosomal recessive CL, ARCL2, is frequently associated with variable metabolic and neurological symptoms. Progeroid symptoms, dysmorphic features, hypotonia and psychomotor retardation are highly overlapping in the early phase of these disorders. This makes the genetic diagnosis often challenging. In search for discriminatory symptoms, we prospectively evaluated clinical, neurologic, metabolic and genetic features in our patient cohort referred for suspected ARCL. From a cohort of 26 children, we confirmed mutations in genes associated with ARCL in 16 children (14 probands), including 12 novel mutations. Abnormal glycosylation and gyration abnormalities were mostly, but not always associated with ATP6V0A2 mutations. Epilepsy was most common in ATP6V0A2 defects. Corpus callosum dysgenesis was associated with PYCR1 and ALDH18A1 mutations. Dystonic posturing was discriminatory for PYCR1 and ALDH18A1 defects. Metabolic markers of mitochondrial dysfunction were found in one patient with PYCR1 mutations. So far unreported white matter abnormalities were found associated with GORAB and RIN2 mutations. We describe a large cohort of CL patients with neurologic involvement. Migration defects and corpus callosum hypoplasia were not always diagnostic for a specific genetic defect in CL. All patients with ATP6V0A2 defects had abnormal glycosylation. To conclude, central nervous system and metabolic abnormalities were discriminatory in this genetically heterogeneous group, although not always diagnostic for a certain genetic defect in CL.
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Affiliation(s)
- Thatjana Gardeitchik
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Miski Mohamed
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Björn Fischer
- Institute of Medical Genetics and Human Genetics, Charité Universitätsmedizin, Berlin, Germany
| | - Martin Lammens
- Department of Pathology, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Dirk Lefeber
- Department of Neurology, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Baiba Lace
- Medical Genetics Clinic, Children's Clinical University Hospital, Riga, Latvia
| | - Michael Parker
- Sheffield Clinical Genetics Service, Sheffield Children's Hospital, Sheffield, UK
| | - Ki-Joong Kim
- Department of Pediatrics, Seoul National University Hospital, Seoul, South Korea
| | - Bing C Lim
- Department of Pediatrics, Seoul National University Hospital, Seoul, South Korea
| | - Johannes Häberle
- Department of Pediatrics, University Children's Hospital, Zürich, Switzerland
| | - Livia Garavelli
- Clinical Genetics Unit, Obstetric and Pediatric Department, Santa Maria Nuova Hospital IRCCS, Reggio Emilia, Italy
| | | | | | - Deanna Guerra
- Department of Biomedical Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Michel Leão
- Pediatric Neurology Unit and Neurogenetics Unit, Hospital S João, Porto, Portugal
| | | | - Han Brunner
- Department of Human Genetics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Leo Nijtmans
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Bert van den Heuvel
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
- Laboratory for Genetic Endocrine and Metabolic Diseases, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Ron Wevers
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
- Laboratory for Genetic Endocrine and Metabolic Diseases, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Uwe Kornak
- Institute of Medical Genetics and Human Genetics, Charité Universitätsmedizin, Berlin, Germany
- FG Development and Disease, Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Eva Morava
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
- Hayward Genetics Center, Tulane University Medical Center, New Orleans, LA, USA
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50
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Ritelli M, Chiarelli N, Quinzani S, Dordoni C, Venturini M, Pezzani L, Calzavara-Pinton P, Colombi M. Identification of two novel ATP6V0A2 mutations in an infant with cutis laxa by exome sequencing. J Dermatol Sci 2014; 75:66-8. [DOI: 10.1016/j.jdermsci.2014.04.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 02/12/2014] [Accepted: 04/03/2014] [Indexed: 11/25/2022]
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