1
|
Ravi M, Karthikeyan PD, Tewari N, Morankar R, Gupta AK, Nehta H, Raghuthaman S. Dentofacial manifestations in a child with Jalili syndrome. SPECIAL CARE IN DENTISTRY 2024; 44:1026-1035. [PMID: 38151709 DOI: 10.1111/scd.12953] [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: 10/01/2023] [Revised: 11/18/2023] [Accepted: 12/15/2023] [Indexed: 12/29/2023]
Abstract
Jalili syndrome (JS) (MIM#217080) is a rare autosomal recessive disorder with oculo-dental malformations. The clinical phenotype is characterized by the presence of Cone-Rod Dystrophy (CRD) and Amelogenesis Imperfecta (AI). Genetic mechanism entails a mutation in the CNNM4, a metal transporter gene located on Chromosome 2q11.2. A high fluoride concentration in groundwater has also been identified as an epigenetic factor in this syndrome. JS draws the attention of dentists due to its distinct oral manifestations. To the best of our knowledge, this is the first genetically confirmed pediatric case report from the Indian subcontinent emphasizing the clinical and radiographic features of this condition and its management in a 6-year-old child.
Collapse
Affiliation(s)
- Mugilan Ravi
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Pavithra Devi Karthikeyan
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Nitesh Tewari
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Rahul Morankar
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Amit Kumar Gupta
- Department of Pediatrics (Genetics), ABVIMS DR RML Hopsital, BKS Marg, New Delhi, India
| | - Hemlata Nehta
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Sruthila Raghuthaman
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| |
Collapse
|
2
|
Shahsavan A, Lee EL, Illes K, Kozlov G, Gehring K. Dimerization of the CNNM extracellular domain. Protein Sci 2024; 33:e4860. [PMID: 38149326 PMCID: PMC10804811 DOI: 10.1002/pro.4860] [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: 09/05/2023] [Revised: 11/30/2023] [Accepted: 12/03/2023] [Indexed: 12/28/2023]
Abstract
Cystathionine-β $$ \beta $$ -synthase (CBS)-pair domain divalent metal cation transport mediators (CNNMs) are an evolutionarily conserved family of magnesium transporters. They mediate magnesium homeostasis directly by transport of Mg2+ ions and indirectly by regulation of the transient receptor potential ion channel subfamily M member 7 (TRPM7). Here, we report the crystal structure of the extracellular domain of tapeworm CNNM4. The domain forms a dimer of immunoglobulin-like (Ig-like) folds with electron density observed for three glycosylation sites. Analytical ultracentrifugation confirms that mutations in the extracellular domain of human CNNM4 prevent its dimerization. An analogous mutation in mouse CNNM2 impairs its activity in a cellular assay of Mg2+ transport.
Collapse
Affiliation(s)
- Ashkan Shahsavan
- Department of Biochemistry & Centre de recherche en biologie structuraleMcGill UniversityMontrealCanada
| | - Emma L. Lee
- Department of Biochemistry & Centre de recherche en biologie structuraleMcGill UniversityMontrealCanada
| | - Katalin Illes
- Department of Biochemistry & Centre de recherche en biologie structuraleMcGill UniversityMontrealCanada
| | - Guennadi Kozlov
- Department of Biochemistry & Centre de recherche en biologie structuraleMcGill UniversityMontrealCanada
| | - Kalle Gehring
- Department of Biochemistry & Centre de recherche en biologie structuraleMcGill UniversityMontrealCanada
| |
Collapse
|
3
|
Chen YS, Gehring K. New insights into the structure and function of CNNM proteins. FEBS J 2023; 290:5475-5495. [PMID: 37222397 DOI: 10.1111/febs.16872] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/17/2023] [Accepted: 05/23/2023] [Indexed: 05/25/2023]
Abstract
Magnesium (Mg2+ ) is the most abundant divalent cation in cells and plays key roles in almost all biological processes. CBS-pair domain divalent metal cation transport mediators (CNNMs) are a newly characterized class of Mg2+ transporters present throughout biology. Originally discovered in bacteria, there are four CNNM proteins in humans, which are involved in divalent cation transport, genetic diseases, and cancer. Eukaryotic CNNMs are composed of four domains: an extracellular domain, a transmembrane domain, a cystathionine-β-synthase (CBS)-pair domain, and a cyclic nucleotide-binding homology domain. The transmembrane and CBS-pair core are the defining features of CNNM proteins with over 20 000 protein sequences known from over 8000 species. Here, we review the structural and functional studies of eukaryotic and prokaryotic CNNMs that underlie our understanding of their regulation and mechanism of ion transport. Recent structures of prokaryotic CNNMs confirm the transmembrane domain mediates ion transport with the CBS-pair domain likely playing a regulatory role through binding divalent cations. Studies of mammalian CNNMs have identified new binding partners. These advances are driving progress in understanding this deeply conserved and widespread family of ion transporters.
Collapse
Affiliation(s)
- Yu Seby Chen
- Department of Biochemistry & Molecular Biology, Life Sciences Institute, The University of British Columbia, Vancouver, BC, Canada
| | - Kalle Gehring
- Department of Biochemistry & Centre de Recherche en Biologie Structurale, McGill University, Montreal, QC, Canada
| |
Collapse
|
4
|
Zhang Z, Xia T, Zhou S, Yang X, Lyu T, Wang L, Fang J, Wang Q, Dou H, Zhang H. High-Quality Chromosome-Level Genome Assembly of the Corsac Fox ( Vulpes corsac) Reveals Adaptation to Semiarid and Harsh Environments. Int J Mol Sci 2023; 24:ijms24119599. [PMID: 37298549 DOI: 10.3390/ijms24119599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 05/24/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
The Corsac fox (Vulpes corsac) is a species of fox distributed in the arid prairie regions of Central and Northern Asia, with distinct adaptations to dry environments. Here, we applied Oxford-Nanopore sequencing and a chromosome structure capture technique to assemble the first Corsac fox genome, which was then assembled into chromosome fragments. The genome assembly has a total length of 2.2 Gb with a contig N50 of 41.62 Mb and a scaffold N50 of 132.2 Mb over 18 pseudo-chromosomal scaffolds. The genome contained approximately 32.67% of repeat sequences. A total of 20,511 protein-coding genes were predicted, of which 88.9% were functionally annotated. Phylogenetic analyses indicated a close relation to the Red fox (Vulpes vulpes) with an estimated divergence time of ~3.7 million years ago (MYA). We performed separate enrichment analyses of species-unique genes, the expanded and contracted gene families, and positively selected genes. The results suggest an enrichment of pathways related to protein synthesis and response and an evolutionary mechanism by which cells respond to protein denaturation in response to heat stress. The enrichment of pathways related to lipid and glucose metabolism, potentially preventing stress from dehydration, and positive selection of genes related to vision, as well as stress responses in harsh environments, may reveal adaptive evolutionary mechanisms in the Corsac fox under harsh drought conditions. Additional detection of positive selection for genes associated with gustatory receptors may reveal a unique desert diet strategy for the species. This high-quality genome provides a valuable resource for studying mammalian drought adaptation and evolution in the genus Vulpes.
Collapse
Affiliation(s)
- Zhihao Zhang
- School of Life Science, Qufu Normal University, Qufu 273165, China
| | - Tian Xia
- School of Life Science, Qufu Normal University, Qufu 273165, China
| | - Shengyang Zhou
- School of Life Science, Qufu Normal University, Qufu 273165, China
| | - Xiufeng Yang
- School of Life Science, Qufu Normal University, Qufu 273165, China
| | - Tianshu Lyu
- School of Life Science, Qufu Normal University, Qufu 273165, China
| | - Lidong Wang
- School of Life Science, Qufu Normal University, Qufu 273165, China
| | - Jiaohui Fang
- School of Life Science, Qufu Normal University, Qufu 273165, China
| | - Qi Wang
- Hulunbuir Academy of Inland Lakes in Northern Cold & Arid Areas, Hulunbuir 021000, China
| | - Huashan Dou
- Hulunbuir Academy of Inland Lakes in Northern Cold & Arid Areas, Hulunbuir 021000, China
| | - Honghai Zhang
- School of Life Science, Qufu Normal University, Qufu 273165, China
| |
Collapse
|
5
|
Bloch-Zupan A, Rey T, Jimenez-Armijo A, Kawczynski M, Kharouf N, Dure-Molla MDL, Noirrit E, Hernandez M, Joseph-Beaudin C, Lopez S, Tardieu C, Thivichon-Prince B, Dostalova T, Macek M, Alloussi ME, Qebibo L, Morkmued S, Pungchanchaikul P, Orellana BU, Manière MC, Gérard B, Bugueno IM, Laugel-Haushalter V. Amelogenesis imperfecta: Next-generation sequencing sheds light on Witkop's classification. Front Physiol 2023; 14:1130175. [PMID: 37228816 PMCID: PMC10205041 DOI: 10.3389/fphys.2023.1130175] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 03/06/2023] [Indexed: 05/27/2023] Open
Abstract
Amelogenesis imperfecta (AI) is a heterogeneous group of genetic rare diseases disrupting enamel development (Smith et al., Front Physiol, 2017a, 8, 333). The clinical enamel phenotypes can be described as hypoplastic, hypomineralized or hypomature and serve as a basis, together with the mode of inheritance, to Witkop's classification (Witkop, J Oral Pathol, 1988, 17, 547-553). AI can be described in isolation or associated with others symptoms in syndromes. Its occurrence was estimated to range from 1/700 to 1/14,000. More than 70 genes have currently been identified as causative. Objectives: We analyzed using next-generation sequencing (NGS) a heterogeneous cohort of AI patients in order to determine the molecular etiology of AI and to improve diagnosis and disease management. Methods: Individuals presenting with so called "isolated" or syndromic AI were enrolled and examined at the Reference Centre for Rare Oral and Dental Diseases (O-Rares) using D4/phenodent protocol (www.phenodent.org). Families gave written informed consents for both phenotyping and molecular analysis and diagnosis using a dedicated NGS panel named GenoDENT. This panel explores currently simultaneously 567 genes. The study is registered under NCT01746121 and NCT02397824 (https://clinicaltrials.gov/). Results: GenoDENT obtained a 60% diagnostic rate. We reported genetics results for 221 persons divided between 115 AI index cases and their 106 associated relatives from a total of 111 families. From this index cohort, 73% were diagnosed with non-syndromic amelogenesis imperfecta and 27% with syndromic amelogenesis imperfecta. Each individual was classified according to the AI phenotype. Type I hypoplastic AI represented 61 individuals (53%), Type II hypomature AI affected 31 individuals (27%), Type III hypomineralized AI was diagnosed in 18 individuals (16%) and Type IV hypoplastic-hypomature AI with taurodontism concerned 5 individuals (4%). We validated the genetic diagnosis, with class 4 (likely pathogenic) or class 5 (pathogenic) variants, for 81% of the cohort, and identified candidate variants (variant of uncertain significance or VUS) for 19% of index cases. Among the 151 sequenced variants, 47 are newly reported and classified as class 4 or 5. The most frequently discovered genotypes were associated with MMP20 and FAM83H for isolated AI. FAM20A and LTBP3 genes were the most frequent genes identified for syndromic AI. Patients negative to the panel were resolved with exome sequencing elucidating for example the gene involved ie ACP4 or digenic inheritance. Conclusion: NGS GenoDENT panel is a validated and cost-efficient technique offering new perspectives to understand underlying molecular mechanisms of AI. Discovering variants in genes involved in syndromic AI (CNNM4, WDR72, FAM20A … ) transformed patient overall care. Unravelling the genetic basis of AI sheds light on Witkop's AI classification.
Collapse
Affiliation(s)
- Agnes Bloch-Zupan
- Université de Strasbourg, Faculté de Chirurgie Dentaire, Strasbourg, France
- Université de Strasbourg, Institut d’études avancées (USIAS), Strasbourg, France
- Hôpitaux Universitaires de Strasbourg (HUS), Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpital Civil, Centre de référence des maladies rares orales et dentaires, O-Rares, Filiére Santé Maladies rares TETE COU, European Reference Network ERN CRANIO, Strasbourg, France
- Université de Strasbourg, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), IN-SERM U1258, CNRS- UMR7104, Illkirch, France
- Eastman Dental Institute, University College London, London, United Kingdom
| | - Tristan Rey
- Université de Strasbourg, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), IN-SERM U1258, CNRS- UMR7104, Illkirch, France
- Hôpitaux Universitaires de Strasbourg, Laboratoires de diagnostic génétique, Institut de Génétique Médicale d’Alsace, Strasbourg, France
| | - Alexandra Jimenez-Armijo
- Université de Strasbourg, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), IN-SERM U1258, CNRS- UMR7104, Illkirch, France
| | - Marzena Kawczynski
- Hôpitaux Universitaires de Strasbourg (HUS), Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpital Civil, Centre de référence des maladies rares orales et dentaires, O-Rares, Filiére Santé Maladies rares TETE COU, European Reference Network ERN CRANIO, Strasbourg, France
| | - Naji Kharouf
- Université de Strasbourg, Laboratoire de Biomatériaux et Bioingénierie, Inserm UMR_S 1121, Strasbourg, France
| | | | - Muriel de La Dure-Molla
- Rothschild Hospital, Public Assistance-Paris Hospitals (AP-HP), Reference Center for Rare Oral and Den-tal Diseases (O-Rares), Paris, France
| | - Emmanuelle Noirrit
- Centre Hospitalier Universitaire (CHU) Rangueil, Toulouse, Competence Center for Rare Oral and Den-tal Diseases, Toulouse, France
| | - Magali Hernandez
- Centre Hospitalier Régional Universitaire de Nancy, Université de Lorraine, Competence Center for Rare Oral and Dental Diseases, Nancy, France
| | - Clara Joseph-Beaudin
- Centre Hospitalier Universitaire de Nice, Competence Center for Rare Oral and Dental Diseases, Nice, France
| | - Serena Lopez
- Centre Hospitalier Universitaire de Nantes, Competence Center for Rare Oral and Dental Diseases, Nantes, France
| | - Corinne Tardieu
- APHM, Hôpitaux Universitaires de Marseille, Hôpital Timone, Competence Center for Rare Oral and Dental Diseases, Marseille, France
| | - Béatrice Thivichon-Prince
- Centre Hospitalier Universitaire de Lyon, Competence Center for Rare Oral and Dental Diseases, Lyon, France
| | | | - Tatjana Dostalova
- Department of Stomatology (TD) and Department of Biology and Medical Genetics (MM) Charles University 2nd Faculty of Medicine and Motol University Hospital, Prague, Czechia
| | - Milan Macek
- Department of Stomatology (TD) and Department of Biology and Medical Genetics (MM) Charles University 2nd Faculty of Medicine and Motol University Hospital, Prague, Czechia
| | | | - Mustapha El Alloussi
- Faculty of Dentistry, International University of Rabat, CReSS Centre de recherche en Sciences de la Santé, Rabat, Morocco
| | - Leila Qebibo
- Unité de génétique médicale et d’oncogénétique, CHU Hassan II, Fes, Morocco
| | | | | | - Blanca Urzúa Orellana
- Instituto de Investigación en Ciencias Odontológicas, Facultad de Odontología, Universidad de Chile, Santiago, Chile
| | - Marie-Cécile Manière
- Université de Strasbourg, Faculté de Chirurgie Dentaire, Strasbourg, France
- Hôpitaux Universitaires de Strasbourg (HUS), Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpital Civil, Centre de référence des maladies rares orales et dentaires, O-Rares, Filiére Santé Maladies rares TETE COU, European Reference Network ERN CRANIO, Strasbourg, France
| | - Bénédicte Gérard
- Hôpitaux Universitaires de Strasbourg, Laboratoires de diagnostic génétique, Institut de Génétique Médicale d’Alsace, Strasbourg, France
| | - Isaac Maximiliano Bugueno
- Université de Strasbourg, Faculté de Chirurgie Dentaire, Strasbourg, France
- Hôpitaux Universitaires de Strasbourg (HUS), Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpital Civil, Centre de référence des maladies rares orales et dentaires, O-Rares, Filiére Santé Maladies rares TETE COU, European Reference Network ERN CRANIO, Strasbourg, France
- Université de Strasbourg, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), IN-SERM U1258, CNRS- UMR7104, Illkirch, France
| | - Virginie Laugel-Haushalter
- Université de Strasbourg, Faculté de Chirurgie Dentaire, Strasbourg, France
- Université de Strasbourg, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), IN-SERM U1258, CNRS- UMR7104, Illkirch, France
- Hôpitaux Universitaires de Strasbourg, Laboratoires de diagnostic génétique, Institut de Génétique Médicale d’Alsace, Strasbourg, France
| |
Collapse
|
6
|
Rattanapornsompong K, Gavila P, Tungsanga S, Chanakul A, Apivatthakakul A, Tengsujaritkul M, Tongsong T, Theerapanon T, Porntaveetus T, Shotelersuk V. Novel CNNM4 variant and clinical features of Jalili syndrome. Clin Genet 2023; 103:256-257. [PMID: 36354001 DOI: 10.1111/cge.14258] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/24/2022] [Accepted: 10/25/2022] [Indexed: 11/11/2022]
Abstract
The study identifies a non-consanguineous multigenerational family of the Lua ethnic group in Northern Thailand with three members affected with hypoplastic-hypocalcified amelogenesis imperfecta, cone-rod dystrophy, and harboring a novel homozygous missense variant, c.1475G>A p.(Gly492Asp), in CNNM4, indicating Jalili syndrome. We report features including advanced dental age, crossbite, developmental delay, expanding genotypic and phenotypic spectra of Jalili syndrome, and perform the prenatal genetic testing that helps avoid unnecessary pregnancy termination.
Collapse
Affiliation(s)
- Khanti Rattanapornsompong
- Center of Excellence in Genomics and Precision Dentistry, Geriatric Dentistry and Special Patients Care Program, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Patcharaporn Gavila
- Center of Excellence in Genomics and Precision Dentistry, Geriatric Dentistry and Special Patients Care Program, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.,Intercountry Centre for Oral Health, Ministry of Public Health, Thailand
| | | | - Ankanee Chanakul
- Department of Pediatrics, Chulalongkorn University, Bangkok, Thailand
| | | | | | - Theera Tongsong
- Department of Obstetrics and Gynecology, Chiang Mai University, Chiang Mai, Thailand
| | - Thanakorn Theerapanon
- Center of Excellence in Genomics and Precision Dentistry, Geriatric Dentistry and Special Patients Care Program, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Thantrira Porntaveetus
- Center of Excellence in Genomics and Precision Dentistry, Geriatric Dentistry and Special Patients Care Program, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Vorasuk Shotelersuk
- Center of Excellence for Medical Genomics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| |
Collapse
|
7
|
Chamniansawat S, Suksridechacin N, Thongon N. Current opinion on the regulation of small intestinal magnesium absorption. World J Gastroenterol 2023; 29:332-342. [PMID: 36687126 PMCID: PMC9846944 DOI: 10.3748/wjg.v29.i2.332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 10/25/2022] [Accepted: 11/19/2022] [Indexed: 01/06/2023] Open
Abstract
Magnesium (Mg2+) has an important role in numerous biological functions, and Mg2+ deficiency is associated with several diseases. Therefore, adequate intestinal absorption of Mg2+ is vital for health. The small intestine was previously thought to absorb digested Mg2+ exclusively through an unregulated paracellular mechanism, which is responsible for approximately 90% of total Mg2+ absorption. Recent studies, however, have revealed that the duodenum, jejunum, and ileum absorb Mg2+ through both transcellular and paracellular routes. Several regulatory factors of small intestinal Mg2+ uptake also have been explored, e.g., parathyroid hormone, fibroblast growth factor-23, apical acidity, proton pump inhibitor, and pH-sensing channel and receptors. The mechanistic factors underlying proton pump inhibitor suppression of small intestinal Mg2+, such as magnesiotropic protein dysfunction, higher mucosal bicarbonate secretion, Paneth cell dysfunction, and intestinal inflammation, are currently being explored. The potential role of small intestinal microbiomes in Mg2+ absorption has also been proposed. In this article, we reviewed the current knowledge on the mechanisms and regulatory factors of small intestinal Mg2+ absorption.
Collapse
Affiliation(s)
- Siriporn Chamniansawat
- Division of Anatomy, Department of Medical Sciences, Faculty of Allied Health Sciences, Burapha University, Muang 20131, Chonburi, Thailand
| | - Nasisorn Suksridechacin
- Biodiversity Research Centre, Thailand Institute of Scientific and Technological Research, Khlong Luang 12120, Pathum Thani, Thailand
| | - Narongrit Thongon
- Division of Physiology, Department of Medical Sciences, Faculty of Allied Health Sciences, Burapha University, Muang 20131, Chonburi, Thailand
| |
Collapse
|
8
|
Jin F, Huang Y, Hattori M. Recent Advances in the Structural Biology of Mg 2+ Channels and Transporters. J Mol Biol 2022; 434:167729. [PMID: 35841930 DOI: 10.1016/j.jmb.2022.167729] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 07/06/2022] [Accepted: 07/07/2022] [Indexed: 10/17/2022]
Abstract
Magnesium ions (Mg2+) are the most abundant divalent cations in living organisms and are essential for various physiological processes, including ATP utilization and the catalytic activity of numerous enzymes. Therefore, the homeostatic mechanisms associated with cellular Mg2+ are crucial for both eukaryotic and prokaryotic organisms and are thus strictly controlled by Mg2+ channels and transporters. Technological advances in structural biology, such as the expression screening of membrane proteins, in meso phase crystallization, and recent cryo-EM techniques, have enabled the structure determination of numerous Mg2+ channels and transporters. In this review article, we provide an overview of the families of Mg2+ channels and transporters (MgtE/SLC41, TRPM6/7, CorA/Mrs2, CorC/CNNM), and discuss the structural biology prospects based on the known structures of MgtE, TRPM7, CorA and CorC.
Collapse
Affiliation(s)
- Fei Jin
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Neurobiology, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Yichen Huang
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Neurobiology, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Motoyuki Hattori
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Neurobiology, School of Life Sciences, Fudan University, Shanghai 200438, China.
| |
Collapse
|
9
|
Li H, Huang Y, Li J, Xie M. Novel homozygous nonsynonymous variant of CNNM4 gene in a Chinese family with Jalili syndrome. Mol Genet Genomic Med 2022; 10:e1860. [PMID: 35150469 PMCID: PMC8922947 DOI: 10.1002/mgg3.1860] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 12/15/2021] [Accepted: 12/17/2021] [Indexed: 11/23/2022] Open
Abstract
Background Jalili syndrome (JS) is a rare autosomal‐recessive inherited disorder characterized by cone‐rod dystrophy and amelogenesis imperfecta. It is often misdiagnosed in clinical practice due to its heterogeneity and rarity. Methods Two JS patients from a consanguineous family were included in this study. Detailed ophthalmic examinations were performed. Oral photography was taken. The DNA sample of the proband was sequenced using the customized capture panel, which includes 338 retinal disease genes. Sanger sequencing was performed for validation and segregation. Results The patients had poor vision, photophobia, and nystagmus from childhood. Fundus examination revealed diffused chorioretinal atrophy with a prominent macular coloboma. OCT showed a deep staphyloma, severely reduced retinal thickness, retinoschisis, loss of photoreceptor layer, and retinal pigment epithelium in the macular region. Amelogenesis imperfecta, dental decay, staining, irregular shapes, and loss of teeth were present. Next‐generation sequencing combined with Sanger validation identified a novel homozygous nonsynonymous variant c.598T>C (p.S200P) in CNNM4 gene (NM_020184.3). Conclusions We described the clinical features of a Chinese family with JS and identified a novel disease‐causing mutation. Our findings broadened the phenotypes and mutation spectrums of JS in Chinese population, as well as are helpful in the diagnosis of this rare disease.
Collapse
Affiliation(s)
- Huajin Li
- Department of Ophthalmology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Yanfeng Huang
- Department of Ophthalmology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Jing Li
- Department of Ophthalmology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Maosong Xie
- Department of Ophthalmology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| |
Collapse
|
10
|
Hyde RA, Kratunova E, Park JC, McAnany JJ. Cone pathway dysfunction in Jalili syndrome due to a novel familial variant of CNNM4 revealed by pupillometry and electrophysiologic investigations. Ophthalmic Genet 2021; 43:268-276. [PMID: 34875963 DOI: 10.1080/13816810.2021.2002916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
PURPOSE To evaluate retinal function in a family presenting with Jalili syndrome due to a previously unreported variant in CNNM4. METHODS A family of three sisters with a novel CNNM4 variant, c.482 T > C p.(Leu161Pro), and ten visually normal, age-similar controls participated in this study. The subjects underwent detailed dental examinations and comprehensive ophthalmological examinations that included color vision testing, retinal imaging, and electroretinography. Full-field light- and dark-adapted luminance thresholds were obtained, in addition to light- and dark-adapted measures of the pupillary light reflex (PLR; pupil constriction elicited by a flash of light) across a range of stimulus luminance. RESULTS Clinical findings of cone dysfunction and amelogenesis imperfecta were observed, consistent with Jalili syndrome. Light-adapted ERGs were non-detectable in CNNM4 subjects, whereas dark-adapted ERGs were generally normal. Full-field luminance thresholds were normal under dark-adapted conditions and were elevated, but measurable, under light-adapted conditions. The CNNM4 subjects had large PLRs under dark-adapted conditions and responses near the lower limit of normal, or slightly subnormal, under light-adapted conditions. CONCLUSION CNNM4 variants can result in Jalili syndrome with cone dystrophy and generally preserved rod function. The PLR may be a useful measure for evaluating cone function in these individuals, as robust cone-mediated PLRs were recordable despite non-detectable light-adapted ERGs.
Collapse
Affiliation(s)
- Robert A Hyde
- Department of Ophthalmology and Visual Sciences, University of Illinois, Chicago, Illinois, USA
| | - Evelina Kratunova
- College of Dentistry, University of Illinois, Chicago, Illinois, USA
| | - Jason C Park
- Department of Ophthalmology and Visual Sciences, University of Illinois, Chicago, Illinois, USA
| | - J Jason McAnany
- Department of Ophthalmology and Visual Sciences, University of Illinois, Chicago, Illinois, USA
| |
Collapse
|
11
|
Abstract
CNNM/CorB proteins are a broadly conserved family of integral membrane proteins with close to 90,000 protein sequences known. They are associated with Mg2+ transport but it is not known if they mediate transport themselves or regulate other transporters. Here, we determine the crystal structure of an archaeal CorB protein in two conformations (apo and Mg2+-ATP bound). The transmembrane DUF21 domain exists in an inward-facing conformation with a Mg2+ ion coordinated by a conserved π-helix. In the absence of Mg2+-ATP, the CBS-pair domain adopts an elongated dimeric configuration with previously unobserved domain-domain contacts. Hydrogen-deuterium exchange mass spectrometry, analytical ultracentrifugation, and molecular dynamics experiments support a role of the structural rearrangements in mediating Mg2+-ATP sensing. Lastly, we use an in vitro, liposome-based assay to demonstrate direct Mg2+ transport by CorB proteins. These structural and functional insights provide a framework for understanding function of CNNMs in Mg2+ transport and associated diseases.
Collapse
|
12
|
Huang Y, Mu K, Teng X, Zhao Y, Funato Y, Miki H, Zhu W, Xu Z, Hattori M. Identification and mechanistic analysis of an inhibitor of the CorC Mg 2+ transporter. iScience 2021; 24:102370. [PMID: 33912817 PMCID: PMC8066426 DOI: 10.1016/j.isci.2021.102370] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/17/2021] [Accepted: 03/24/2021] [Indexed: 11/17/2022] Open
Abstract
The CorC/CNNM family of Na+-dependent Mg2+ transporters is ubiquitously conserved from bacteria to humans. CorC, the bacterial CorC/CNNM family of proteins, is involved in resistance to antibiotic exposure and in the survival of pathogenic microorganisms in their host environment. The CorC/CNNM family proteins possess a cytoplasmic region containing the regulatory ATP-binding site. CorC and CNNM have attracted interest as therapeutic targets, whereas inhibitors targeting the ATP-binding site have not been identified. Here, we performed a virtual screening of CorC by targeting its ATP-binding site, identified a compound named IGN95a with inhibitory effects on ATP binding and Mg2+ export, and determined the cytoplasmic domain structure in complex with IGN95a. Furthermore, a chemical cross-linking experiment indicated that with ATP bound to the cytoplasmic domain, the conformational equilibrium of CorC was shifted more toward the inward-facing state of the transmembrane domain. In contrast, IGN95a did not induce such a shift.
Collapse
Affiliation(s)
- Yichen Huang
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Shanghai Key Laboratory of Bioactive Small Molecules, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| | - Kaijie Mu
- CAS Key Laboratory of Receptor Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Pudong New Area, Shanghai, 201203, China
| | - Xinyu Teng
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Shanghai Key Laboratory of Bioactive Small Molecules, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| | - Yimeng Zhao
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Shanghai Key Laboratory of Bioactive Small Molecules, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| | - Yosuke Funato
- Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiroaki Miki
- Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Weiliang Zhu
- CAS Key Laboratory of Receptor Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Pudong New Area, Shanghai, 201203, China
| | - Zhijian Xu
- CAS Key Laboratory of Receptor Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Pudong New Area, Shanghai, 201203, China
| | - Motoyuki Hattori
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Shanghai Key Laboratory of Bioactive Small Molecules, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| |
Collapse
|
13
|
Huang Y, Jin F, Funato Y, Xu Z, Zhu W, Wang J, Sun M, Zhao Y, Yu Y, Miki H, Hattori M. Structural basis for the Mg 2+ recognition and regulation of the CorC Mg 2+ transporter. SCIENCE ADVANCES 2021; 7:7/7/eabe6140. [PMID: 33568487 PMCID: PMC7875539 DOI: 10.1126/sciadv.abe6140] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/23/2020] [Indexed: 05/05/2023]
Abstract
The CNNM/CorC family proteins are Mg2+ transporters that are widely distributed in all domains of life. In bacteria, CorC has been implicated in the survival of pathogenic microorganisms. In humans, CNNM proteins are involved in various biological events, such as body absorption/reabsorption of Mg2+ and genetic disorders. Here, we determined the crystal structure of the Mg2+-bound CorC TM domain dimer. Each protomer has a single Mg2+ binding site with a fully dehydrated Mg2+ ion. The residues at the Mg2+ binding site are strictly conserved in both human CNNM2 and CNNM4, and many of these residues are associated with genetic diseases. Furthermore, we determined the structures of the CorC cytoplasmic region containing its regulatory ATP-binding domain. A combination of structural and functional analyses not only revealed the potential interface between the TM and cytoplasmic domains but also showed that ATP binding is important for the Mg2+ export activity of CorC.
Collapse
Affiliation(s)
- Yichen Huang
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, and Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| | - Fei Jin
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, and Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| | - Yosuke Funato
- Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Zhijian Xu
- CAS Key Laboratory of Receptor Research and Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Pudong New Area, Shanghai 201203, China
| | - Weiliang Zhu
- CAS Key Laboratory of Receptor Research and Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Pudong New Area, Shanghai 201203, China
| | - Jing Wang
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Medical Building, Room 128, 639 Long-Mian Road, Nanjing 200098, China
| | - Minxuan Sun
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, and Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| | - Yimeng Zhao
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, and Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China
| | - Ye Yu
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Medical Building, Room 128, 639 Long-Mian Road, Nanjing 200098, China
| | - Hiroaki Miki
- Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
| | - Motoyuki Hattori
- State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Bioactive Small Molecules, Collaborative Innovation Center of Genetics and Development, and Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai 200438, China.
| |
Collapse
|
14
|
Kozlov G, Funato Y, Chen YS, Zhang Z, Illes K, Miki H, Gehring K. PRL3 pseudophosphatase activity is necessary and sufficient to promote metastatic growth. J Biol Chem 2020; 295:11682-11692. [PMID: 32571875 PMCID: PMC7450121 DOI: 10.1074/jbc.ra120.014464] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/17/2020] [Indexed: 01/07/2023] Open
Abstract
Phosphatases of regenerating liver (PRLs) are markers of cancer and promote tumor growth. They have been implicated in a variety of biochemical pathways but the physiologically relevant target of phosphatase activity has eluded 20 years of investigation. Here, we show that PRL3 catalytic activity is not required in a mouse model of metastasis. PRL3 binds and inhibits CNNM4, a membrane protein associated with magnesium transport. Analysis of PRL3 mutants specifically defective in either CNNM-binding or phosphatase activity demonstrate that CNNM binding is necessary and sufficient to promote tumor metastasis. As PRLs do have phosphatase activity, they are in fact pseudo-pseudophosphatases. Phosphatase activity leads to formation of phosphocysteine, which blocks CNNM binding and may play a regulatory role. We show levels of PRL cysteine phosphorylation vary in response to culture conditions and in different tissues. Examination of related protein phosphatases shows the stability of phosphocysteine is a unique and evolutionarily conserved property of PRLs. The demonstration that PRL3 functions as a pseudophosphatase has important ramifications for the design of PRL inhibitors for cancer.
Collapse
Affiliation(s)
- Guennadi Kozlov
- Department of Biochemistry and Centre de Recherche en Biologie Structurale, McGill University, Montreal, Quebec, Canada
| | - Yosuke Funato
- Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
| | - Yu Seby Chen
- Department of Biochemistry and Centre de Recherche en Biologie Structurale, McGill University, Montreal, Quebec, Canada
| | - Zhidian Zhang
- Department of Biochemistry and Centre de Recherche en Biologie Structurale, McGill University, Montreal, Quebec, Canada
| | - Katalin Illes
- Department of Biochemistry and Centre de Recherche en Biologie Structurale, McGill University, Montreal, Quebec, Canada
| | - Hiroaki Miki
- Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
| | - Kalle Gehring
- Department of Biochemistry and Centre de Recherche en Biologie Structurale, McGill University, Montreal, Quebec, Canada, For correspondence: Kalle Gehring,
| |
Collapse
|
15
|
Cai F, Huang Y, Wang M, Sun M, Zhao Y, Hattori M. A FRET-based screening method to detect potential inhibitors of the binding of CNNM3 to PRL2. Sci Rep 2020; 10:12879. [PMID: 32733084 PMCID: PMC7393355 DOI: 10.1038/s41598-020-69818-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 07/08/2020] [Indexed: 11/09/2022] Open
Abstract
The cyclin M (CNNM) family of Mg2+ transporters is reported to promote tumour progression by binding to phosphatase of regenerating liver (PRL) proteins. Here, we established an assay for detection of the binding between the cystathionine-beta-synthase (CBS) domain of human CNNM3 (a region responsible for PRL binding) and human PRL2 using fluorescence resonance energy transfer (FRET) techniques. By fusing YPet to the C-terminus of the CNNM3 CBS domain and CyPet to the N-terminus of PRL2, we performed a FRET-based binding assay with purified proteins in multiwell plates and successfully detected the changes in fluorescence intensity derived from FRET with a reasonable Kd. We then confirmed that the addition of non-YPet-tagged CNNM3 and non-CyPet-tagged PRL proteins inhibited the changes in FRET intensity, whereas non-YPet-tagged CNNM3 with a mutation at the PRL2-binding site did not exhibit such inhibition. Furthermore, newly synthesized peptides derived from the CNNM loop region, with the PRL-binding sequences of the CNNM3 CBS domain, inhibited the interactions between CNNM3 and PRL2. Overall, these results showed that this method can be used for screening to identify inhibitors of CNNM-PRL interactions, potentially for novel anticancer therapy.
Collapse
Affiliation(s)
- Faji Cai
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai, 200438, China
| | - Yichen Huang
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai, 200438, China
| | - Mengqi Wang
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai, 200438, China
| | - Minxuan Sun
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai, 200438, China
| | - Yimeng Zhao
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai, 200438, China.
| | - Motoyuki Hattori
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Department of Physiology and Biophysics, School of Life Sciences, Fudan University, 2005 Songhu Road, Yangpu District, Shanghai, 200438, China.
| |
Collapse
|
16
|
Mg2+-ATP Sensing in CNNM, a Putative Magnesium Transporter. Structure 2020; 28:324-335.e4. [DOI: 10.1016/j.str.2019.11.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/06/2019] [Accepted: 11/27/2019] [Indexed: 01/10/2023]
|
17
|
Prasov L, Ullah E, Turriff AE, Warner BM, Conley J, Mark PR, Hufnagel RB, Huryn LA. Expanding the genotypic spectrum of Jalili syndrome: Novel CNNM4 variants and uniparental isodisomy in a north American patient cohort. Am J Med Genet A 2020; 182:493-497. [PMID: 32022389 PMCID: PMC8041260 DOI: 10.1002/ajmg.a.61484] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/07/2019] [Accepted: 11/11/2019] [Indexed: 01/15/2023]
Abstract
Jalili syndrome is a rare multisystem disorder with the most prominent features consisting of cone-rod dystrophy and amelogenesis imperfecta. Few cases have been reported in the Americas. Here we describe a case series of patients with Jalili syndrome examined at the National Eye Institute’s Ophthalmic Genetics clinic between 2016 and 2018. Three unrelated sporadic cases were systematically evaluated for ocular phenotype and determined to have cone-rod dystrophy with bull’s eye maculopathy, photophobia, and nystagmus. All patients had amelogenesis imperfecta. Two of these patients had Guatemalan ancestry and the same novel homozygous CNNM4 variant (p.Arg236Trp c.706C > T) without evidence of consanguinity. This variant met likely pathogenic criteria by the American College of Medical Genetics guidelines. An additional patient had a homozygous deleterious variant in CNNM4 (c.279delC p.Phe93Leufs*31), which resulted from paternal uniparental isodisomy for chromosome 2p22–2q37. This individual had additional syndromic features including developmental delay and spastic diplegia, likely related to mutations at other loci. Our work highlights the genotypic variability of Jalili syndrome and expands the genotypic spectrum of this condition by describing the first series of patients seen in the United States.
Collapse
Affiliation(s)
- Lev Prasov
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland.,Department of Ophthalmology and Visual Sciences, W.K. Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan.,Department of Human Genetics, University of Michigan, Ann Arbor, Michigan
| | - Ehsan Ullah
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland
| | - Amy E Turriff
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland
| | - Blake M Warner
- National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland
| | - Julie Conley
- Section of Pediatric Ophthalmology, Helen DeVos Children's Hospital, Grand Rapids, Michigan
| | - Paul R Mark
- Spectrum Health Division of Medical Genetics, Grand Rapids, Michigan
| | - Robert B Hufnagel
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland
| | - Laryssa A Huryn
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland
| |
Collapse
|
18
|
Liachko NF, Saxton AD, McMillan PJ, Strovas TJ, Keene CD, Bird TD, Kraemer BC. Genome wide analysis reveals heparan sulfate epimerase modulates TDP-43 proteinopathy. PLoS Genet 2019; 15:e1008526. [PMID: 31834878 PMCID: PMC6934317 DOI: 10.1371/journal.pgen.1008526] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 12/27/2019] [Accepted: 11/15/2019] [Indexed: 12/31/2022] Open
Abstract
Pathological phosphorylated TDP-43 protein (pTDP) deposition drives neurodegeneration in amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD-TDP). However, the cellular and genetic mechanisms at work in pathological TDP-43 toxicity are not fully elucidated. To identify genetic modifiers of TDP-43 neurotoxicity, we utilized a Caenorhabditis elegans model of TDP-43 proteinopathy expressing human mutant TDP-43 pan-neuronally (TDP-43 tg). In TDP-43 tg C. elegans, we conducted a genome-wide RNAi screen covering 16,767 C. elegans genes for loss of function genetic suppressors of TDP-43-driven motor dysfunction. We identified 46 candidate genes that when knocked down partially ameliorate TDP-43 related phenotypes; 24 of these candidate genes have conserved homologs in the human genome. To rigorously validate the RNAi findings, we crossed the TDP-43 transgene into the background of homozygous strong genetic loss of function mutations. We have confirmed 9 of the 24 candidate genes significantly modulate TDP-43 transgenic phenotypes. Among the validated genes we focused on, one of the most consistent genetic modifier genes protecting against pTDP accumulation and motor deficits was the heparan sulfate-modifying enzyme hse-5, the C. elegans homolog of glucuronic acid epimerase (GLCE). We found that knockdown of human GLCE in cultured human cells protects against oxidative stress induced pTDP accumulation. Furthermore, expression of glucuronic acid epimerase is significantly decreased in the brains of FTLD-TDP cases relative to normal controls, demonstrating the potential disease relevance of the candidate genes identified. Taken together these findings nominate glucuronic acid epimerase as a novel candidate therapeutic target for TDP-43 proteinopathies including ALS and FTLD-TDP. The protein TDP-43 forms aggregates in disease-affected neurons in patients with ALS and FTLD-TDP. In addition, mutations in the human gene coding for TDP-43 can cause inherited ALS. By expressing human mutant TDP-43 protein in C. elegans neurons, we have modelled aspects of ALS pathobiology. This animal model exhibits severe motor dysfunction, progressive neurodegeneration, and accumulation of abnormally modified TDP-43 protein. To identify genes controlling TDP-43 neurotoxicity in C. elegans, we have conducted a genome-wide reverse genetic screen and found 46 genes that participate in TDP-43 neurotoxicity. We demonstrated that one of them, glucuronic acid epimerase, is decreased in patients with FTLD-TDP suggesting inhibitors of glucuronic acid epimerase could have therapeutic value for ALS and FTLD.
Collapse
Affiliation(s)
- Nicole F. Liachko
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, United States of America
- Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Aleen D. Saxton
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, United States of America
| | - Pamela J. McMillan
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, Washington, United States of America
| | - Timothy J. Strovas
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, United States of America
| | - C. Dirk Keene
- Department of Pathology, University of Washington, Seattle, Washington, United States of America
| | - Thomas D. Bird
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, United States of America
- Department of Neurology, University of Washington, Seattle, Washington, United States of America
- Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Brian C. Kraemer
- Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington, United States of America
- Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, Washington, United States of America
- Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, Washington, United States of America
- * E-mail:
| |
Collapse
|
19
|
Giménez-Mascarell P, Oyenarte I, González-Recio I, Fernández-Rodríguez C, Corral-Rodríguez MÁ, Campos-Zarraga I, Simón J, Kostantin E, Hardy S, Díaz Quintana A, Zubillaga Lizeaga M, Merino N, Diercks T, Blanco FJ, Díaz Moreno I, Martínez-Chantar ML, Tremblay ML, Müller D, Siliqi D, Martínez-Cruz LA. Structural Insights into the Intracellular Region of the Human Magnesium Transport Mediator CNNM4. Int J Mol Sci 2019; 20:E6279. [PMID: 31842432 PMCID: PMC6940986 DOI: 10.3390/ijms20246279] [Citation(s) in RCA: 10] [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: 11/26/2019] [Revised: 12/05/2019] [Accepted: 12/10/2019] [Indexed: 12/17/2022] Open
Abstract
The four member family of "Cyclin and Cystathionine β-synthase (CBS) domain divalent metal cation transport mediators", CNNMs, are the least-studied mammalian magnesium transport mediators. CNNM4 is abundant in the brain and the intestinal tract, and its abnormal activity causes Jalili Syndrome. Recent findings show that suppression of CNNM4 in mice promotes malignant progression of intestinal polyps and is linked to infertility. The association of CNNM4 with phosphatases of the regenerating liver, PRLs, abrogates its Mg2+-efflux capacity, thus resulting in an increased intracellular Mg2+ concentration that favors tumor growth. Here we present the crystal structures of the two independent intracellular domains of human CNNM4, i.e., the Bateman module and the cyclic nucleotide binding-like domain (cNMP). We also derive a model structure for the full intracellular region in the absence and presence of MgATP and the oncogenic interacting partner, PRL-1. We find that only the Bateman module interacts with ATP and Mg2+, at non-overlapping sites facilitating their positive cooperativity. Furthermore, both domains dimerize autonomously, where the cNMP domain dimer forms a rigid cleft to restrict the Mg2+ induced sliding of the inserting CBS1 motives of the Bateman module, from a twisted to a flat disk shaped dimer.
Collapse
Grants
- ETORTEK IE05-147 Departamento de Industria, Innovación, Comercio y Turismo del Gobierno Vasco
- IE07-202 Departamento de Industria, Innovación, Comercio y Turismo del Gobierno Vasco
- 7/13/08/2006/11 Diputación Foral de Bizkaia
- 7/13/08/2005/14 Diputación Foral de Bizkaia
- BFU2010-17857 Ministerio de Ciencia e Innovación
- BFU2013-47531-R Ministerio de Economía, Industria y Competitividad, Gobierno de España
- BES-2014-068464 Ministerio de Economía, Industria y Competitividad, Gobierno de España
- BFU2016-77408-R Ministerio de Economía, Industria y Competitividad, Gobierno de España
- BES-2017-080435 Ministerio de Economía, Industria y Competitividad, Gobierno de España
- CSD2008-00005 MICINN CONSOLIDER-INGENIO 2010 Program
- BAG MX20113 Diamond Light source
- 2013111114 Gobierno Vasco-Departamento de Salud
- SAF2017-87301-R Ministerio de Economía, Industria y Competitividad, Gobierno de España
- BIO15/CA/014 EITB Maratoia
- SEV-2016-0644 Ministerio de Economía, Industria y Competitividad, Gobierno de España
- 12.01.134/2bT4 Berlin Institute of Health
- #343439 Canadian Institute for Health Research
- MX15832-9 Diamond Light Source
- MX15832-10 Diamond Light Source
- PGC2018-096049-B100 Ministerio de Economía, Industria y Competitividad, Gobierno de España
- CTQ2017-83810-R Ministerio de Economía, Industria y Competitividad, Gobierno de España
- PI2010-17 Departamento de Educación, Universidades e Investigación del Gobierno Vasco
- BAG 2019073624 ALBA Synchrotron
Collapse
Affiliation(s)
- Paula Giménez-Mascarell
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| | - Iker Oyenarte
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| | - Irene González-Recio
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| | - Carmen Fernández-Rodríguez
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| | - María Ángeles Corral-Rodríguez
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| | - Igone Campos-Zarraga
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| | - Jorge Simón
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| | - Elie Kostantin
- Department of Biochemistry and Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada; (E.K.); (S.H.); (M.L.T.)
| | - Serge Hardy
- Department of Biochemistry and Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada; (E.K.); (S.H.); (M.L.T.)
| | - Antonio Díaz Quintana
- Instituto de Investigaciones Químicas (IIQ), Centro de Investigaciones Científicas Isla de la Cartuja (cicCartuja), Universidad de Sevilla—CSIC. Avda. Americo Vespucio 49, 41092 Sevilla, Spain; (A.D.Q.); (I.D.M.)
| | - Mara Zubillaga Lizeaga
- Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 800, 48160 Derio, Spain; (M.Z.L.); (N.M.); (T.D.); (F.J.B.)
| | - Nekane Merino
- Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 800, 48160 Derio, Spain; (M.Z.L.); (N.M.); (T.D.); (F.J.B.)
| | - Tammo Diercks
- Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 800, 48160 Derio, Spain; (M.Z.L.); (N.M.); (T.D.); (F.J.B.)
| | - Francisco J. Blanco
- Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 800, 48160 Derio, Spain; (M.Z.L.); (N.M.); (T.D.); (F.J.B.)
- IKERBASQUE, Basque Foundation for Science, María Díaz de Haro 3, 48013 Bilbao, Spain
| | - Irene Díaz Moreno
- Instituto de Investigaciones Químicas (IIQ), Centro de Investigaciones Científicas Isla de la Cartuja (cicCartuja), Universidad de Sevilla—CSIC. Avda. Americo Vespucio 49, 41092 Sevilla, Spain; (A.D.Q.); (I.D.M.)
| | - María Luz Martínez-Chantar
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 48160 Derio, Spain
| | - Michel L. Tremblay
- Department of Biochemistry and Goodman Cancer Research Centre, McGill University, Montreal, QC H3A 1A3, Canada; (E.K.); (S.H.); (M.L.T.)
| | - Dominik Müller
- Department of Pediatric Gastroenterology, Nephrology and Metabolic Disorders, Charité Universitäts medizin, 13353 Berlin, Germany;
| | - Dritan Siliqi
- Istituto di Cristallografia, Consiglio Nazionale delle Ricerche (CNR), Via G. Amendola 122/O, 70126 Bari, Italy;
| | - Luis Alfonso Martínez-Cruz
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Bizkaia Science and Technology Park Bld 801A, 48160 Derio, Spain; (P.G.-M.); (I.O.); (I.G.-R.); (C.F.-R.); (M.Á.C.-R.); (I.C.-Z.); (J.S.); (M.L.M.-C.)
| |
Collapse
|
20
|
Parveen A, Mirza MU, Vanmeert M, Akhtar J, Bashir H, Khan S, Shehzad S, Froeyen M, Ahmed W, Ansar M, Wasif N. A novel pathogenic missense variant in CNNM4 underlying Jalili syndrome: Insights from molecular dynamics simulations. Mol Genet Genomic Med 2019; 7:e902. [PMID: 31347285 PMCID: PMC6732295 DOI: 10.1002/mgg3.902] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 06/04/2019] [Accepted: 07/08/2019] [Indexed: 12/24/2022] Open
Abstract
Background Jalili syndrome (JS) is a rare cone‐rod dystrophy (CRD) associated with amelogenesis imperfecta (AI). The first clinical presentation of JS patients was published in 1988 by Jalili and Smith. Pathogenic mutations in the Cyclin and CBS Domain Divalent Metal Cation Transport Mediator 4 (CNNM4) magnesium transporter protein have been reported as the leading cause of this anomaly. Methods In the present study, a clinical and genetic investigation was performed in a consanguineous family of Pakistani origin, showing characteristic features of JS. Sanger sequencing was successfully used to identify the causative variant in CNNM4. Molecular dynamics (MD) simulations were performed to study the effect of amino acid change over CNNM4 protein. Results Sequence analysis of CNNM4 revealed a novel missense variant (c.1220G>T, p.Arg407Leu) in exon‐1 encoding cystathionine‐β‐synthase (CBS) domain. To comprehend the mutational consequences in the structure, the mutant p.Arg407Leu was modeled together with a previously reported variant (c.1484C>T, p.Thr495Ile) in the same domain. Additionally, docking analysis deciphered the binding mode of the adenosine triphosphate (ATP) cofactor. Furthermore, 60ns MD simulations were carried out on wild type (p.Arg407/p.Thr495) and mutants (p.Arg407Leu/p.Thr495Ile) to understand the structural and energetic changes in protein structure and its dynamic behavior. An evident conformational shift of ATP in the binding site was observed in simulated mutants disrupting the native ATP‐binding mode. Conclusion The novel identified variant in CNNM4 is the first report from the Pakistani population. Overall, the study is valuable and may give a novel insight into metal transport in visual function and biomineralization.
Collapse
Affiliation(s)
- Asia Parveen
- Institute of Molecular Biology and Biotechnology (IMBB), Centre for Research in Molecular Medicine (CRiMM), The University of Lahore, Lahore, Pakistan.,Faculty of Life Sciences, University of Central Punjab (UCP), Lahore, Pakistan
| | - Muhammad U Mirza
- Department of Pharmaceutical Sciences, REGA Institute for Medical Research, Medicinal Chemistry, University of Leuven, Leuven, Belgium
| | - Michiel Vanmeert
- Department of Pharmaceutical Sciences, REGA Institute for Medical Research, Medicinal Chemistry, University of Leuven, Leuven, Belgium
| | - Javed Akhtar
- Institute of Molecular Biology and Biotechnology (IMBB), Centre for Research in Molecular Medicine (CRiMM), The University of Lahore, Lahore, Pakistan
| | - Hina Bashir
- Institute of Molecular Biology and Biotechnology (IMBB), Centre for Research in Molecular Medicine (CRiMM), The University of Lahore, Lahore, Pakistan.,Department of Biochemistry, Sharif Medical and Dental College, Lahore, Pakistan
| | - Saadullah Khan
- Department of Biotechnology and Genetic Engineering, Kohat University of Science and Technology (KUST), Kohat, Pakistan
| | - Saqib Shehzad
- Faculty of Life Sciences, University of Central Punjab (UCP), Lahore, Pakistan
| | - Matheus Froeyen
- Department of Pharmaceutical Sciences, REGA Institute for Medical Research, Medicinal Chemistry, University of Leuven, Leuven, Belgium
| | - Wasim Ahmed
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Muhammad Ansar
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Naveed Wasif
- Institute of Molecular Biology and Biotechnology (IMBB), Centre for Research in Molecular Medicine (CRiMM), The University of Lahore, Lahore, Pakistan.,Institute of Human Genetics, University of Ulm & University Hospital, Ulm, Germany.,Institute of Human Genetics, University Hospital Schleswig-Holstein, Kiel, Germany
| |
Collapse
|
21
|
Smith C, Poulter J, Brookes S, Murillo G, Silva S, Brown C, Patel A, Hussain H, Kirkham J, Inglehearn C, Mighell A. Phenotype and Variant Spectrum in the LAMB3 Form of Amelogenesis Imperfecta. J Dent Res 2019; 98:698-704. [PMID: 30905256 PMCID: PMC6535922 DOI: 10.1177/0022034519835205] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Amelogenesis imperfecta (AI) is a heterogeneous group of inherited disorders characterized by abnormal formation of dental enamel, either in isolation or as part of a syndrome. Heterozygous variants in laminin subunit beta 3 ( LAMB3) cause AI with dominant inheritance in the absence of other cosegregating clinical features. In contrast, biallelic loss-of-function variants in LAMB3 cause recessive junctional epidermolysis bullosa, characterized by life-threatening skin fragility. We identified 2 families segregating autosomal dominant AI with variable degrees of a distinctive hypoplastic phenotype due to pathogenic variants in LAMB3. Whole exome sequencing revealed a nonsense variant (c.3340G>T, p.E1114*) within the final exon in family 1, while Sanger sequencing in family 2 revealed a variant (c.3383-1G>A) in the canonical splice acceptor site of the final exon. Analysis of cDNA from family 2 revealed retention of the final intron leading to a premature termination codon. Two unerupted third molar teeth from individual IV:5 in family 2 were subject to computerized tomography and scanning electron microscopy. LAMB3 molar teeth have a multitude of cusps versus matched controls. LAMB3 enamel was well mineralized but pitted. The architecture of the initially secreted enamel was abnormal, with cervical enamel appearing much less severely affected than coronal enamel. This study further defines the variations in phenotype-genotype correlation for AI due to variants in LAMB3, underlines the clustering of nonsense and frameshift variants causing AI in the absence of junctional epidermolysis bullosa, and highlights the shared AI phenotype arising from variants in genes coding for hemidesmosome proteins.
Collapse
Affiliation(s)
- C.E.L. Smith
- Division of Molecular Medicine, Leeds
Institute of Medical Research, University of Leeds, Leeds, UK
- Department of Oral Biology, School of
Dentistry, St James’s University Hospital, University of Leeds, Leeds, UK
| | - J.A. Poulter
- Division of Molecular Medicine, Leeds
Institute of Medical Research, University of Leeds, Leeds, UK
| | - S.J. Brookes
- Department of Oral Biology, School of
Dentistry, St James’s University Hospital, University of Leeds, Leeds, UK
| | - G. Murillo
- School of Dentistry, Universidad de
Costa Rica, Ciudad Universitaria Rodrigo Facio, San Pedro Montes De Oca, Costa
Rica
| | - S. Silva
- Cellular and Molecular Biology Centre,
Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San Pedro Montes de
Oca, Costa Rica
| | - C.J. Brown
- Birmingham Dental Hospital and School of
Dentistry, Edgbaston, Birmingham, UK
| | - A. Patel
- Birmingham Dental Hospital and School of
Dentistry, Edgbaston, Birmingham, UK
| | - H. Hussain
- School of Medicine, University of Leeds,
Leeds, UK
| | - J. Kirkham
- Department of Oral Biology, School of
Dentistry, St James’s University Hospital, University of Leeds, Leeds, UK
| | - C.F. Inglehearn
- Division of Molecular Medicine, Leeds
Institute of Medical Research, University of Leeds, Leeds, UK
| | - A.J. Mighell
- School of Dentistry, University of
Leeds, Leeds, UK
| |
Collapse
|
22
|
Current Structural Knowledge on the CNNM Family of Magnesium Transport Mediators. Int J Mol Sci 2019; 20:ijms20051135. [PMID: 30845649 PMCID: PMC6429129 DOI: 10.3390/ijms20051135] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 02/06/2023] Open
Abstract
The cyclin and cystathionine β-synthase (CBS) domain magnesium transport mediators, CNNMs, are key players in maintaining the homeostasis of magnesium in different organs. The human family includes four members, whose impaired activity causes diseases such as Jalili Syndrome or Familial Hypomagnesemia, but is also linked to neuropathologic disorders, altered blood pressure, and infertility. Recent findings demonstrated that CNNMs are associated with the highly oncogenic phosphatases of the regenerating liver to promote tumor growth and metastasis, which has attracted renewed focus on their potential exploitation as targets for cancer treatment. However, the exact function of CNNMs remains unclear and is subject to debate, proposed as either direct transporters, sensors, or homeostatic factors. This review gathers the current structural knowledge on the CNNM family, highlighting similarities and differences with the closely related structural partners such as the bacterial Mg2+/Co2+ efflux protein CorC and the Mg2+ channel MgtE.
Collapse
|
23
|
Daneshmandpour Y, Darvish H, Pashazadeh F, Emamalizadeh B. Features, genetics and their correlation in Jalili syndrome: a systematic review. J Med Genet 2019; 56:358-369. [DOI: 10.1136/jmedgenet-2018-105716] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 01/02/2019] [Accepted: 01/09/2019] [Indexed: 11/03/2022]
Abstract
Jalili syndrome is a rare genetic disorder first identified by Jalili in Gaza. Amelogenesis imperfecta and cone-rode dystrophy are simultaneously seen in Jalili syndrome patients as the main and primary manifestations. Molecular analysis has revealed that theCNNM4gene is responsible for this rare syndrome. Jalili syndrome has been observed in many countries around the world, especially in the Middle East and North Africa. In the current scoping systematic review we searched electronic databases to find studies related to Jalili syndrome. In this review we summarise the reported clinical symptoms,CNNM4gene and protein structure,CNNM4mutations, attempts to reach a genotype-phenotype correlation, the functional role ofCNNM4mutations, and epidemiological aspects of Jalili syndrome. In addition, we have analysed the reported mutations in mutation effect prediction databases in order to gain a better understanding of the mutation’s outcomes.
Collapse
|
24
|
Cnnm4 deficiency suppresses Ca2+ signaling and promotes cell proliferation in the colon epithelia. Oncogene 2019; 38:3962-3969. [DOI: 10.1038/s41388-019-0682-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 12/17/2018] [Accepted: 12/24/2018] [Indexed: 12/25/2022]
|
25
|
Chen YS, Kozlov G, Fakih R, Funato Y, Miki H, Gehring K. The cyclic nucleotide-binding homology domain of the integral membrane protein CNNM mediates dimerization and is required for Mg 2+ efflux activity. J Biol Chem 2018; 293:19998-20007. [PMID: 30341174 PMCID: PMC6311497 DOI: 10.1074/jbc.ra118.005672] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 10/16/2018] [Indexed: 01/07/2023] Open
Abstract
Proteins of the cyclin M family (CNNMs; also called ancient conserved domain proteins, or ACDPs) are represented by four integral membrane proteins that have been proposed to function as Mg2+ transporters. CNNMs are associated with a number of genetic diseases affecting ion movement and cancer via their association with highly oncogenic phosphatases of regenerating liver (PRLs). Structurally, CNNMs contain an N-terminal extracellular domain, a transmembrane domain (DUF21), and a large cytosolic region containing a cystathionine-β-synthase (CBS) domain and a putative cyclic nucleotide-binding homology (CNBH) domain. Although the CBS domain has been extensively characterized, little is known about the CNBH domain. Here, we determined the first crystal structures of the CNBH domains of CNNM2 and CNNM3 at 2.6 and 1.9 Å resolutions. Contrary to expectation, these domains did not bind cyclic nucleotides, but mediated dimerization both in crystals and in solution. Analytical ultracentrifugation experiments revealed an inverse correlation between the propensity of the CNBH domains to dimerize and the ability of CNNMs to mediate Mg2+ efflux. CNBH domains from active family members were observed as both dimers and monomers, whereas the inactive member, CNNM3, was observed only as a dimer. Mutational analysis revealed that the CNBH domain was required for Mg2+ efflux activity of CNNM4. This work provides a structural basis for understanding the function of CNNM proteins in Mg2+ transport and associated diseases.
Collapse
Affiliation(s)
- Yu Seby Chen
- From the Department of Biochemistry and Centre for Structural Biology, McGill University, Montreal, Quebec H3G 0B1, Canada and
| | - Guennadi Kozlov
- From the Department of Biochemistry and Centre for Structural Biology, McGill University, Montreal, Quebec H3G 0B1, Canada and
| | - Rayan Fakih
- From the Department of Biochemistry and Centre for Structural Biology, McGill University, Montreal, Quebec H3G 0B1, Canada and
| | - Yosuke Funato
- the Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hiroaki Miki
- the Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan
| | - Kalle Gehring
- From the Department of Biochemistry and Centre for Structural Biology, McGill University, Montreal, Quebec H3G 0B1, Canada and , To whom correspondence should be addressed:
Dept. of Biochemistry, McGill University, 3649 Promenade Sir-William-Osler, Rm. 469, Montreal, Quebec H3G 0B1, Canada. Tel.:
514-398-7287; E-mail:
| |
Collapse
|
26
|
Molecular function and biological importance of CNNM family Mg2+ transporters. J Biochem 2018; 165:219-225. [DOI: 10.1093/jb/mvy095] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Accepted: 11/19/2018] [Indexed: 12/15/2022] Open
|
27
|
Hardy S, Kostantin E, Hatzihristidis T, Zolotarov Y, Uetani N, Tremblay ML. Physiological and oncogenic roles of thePRLphosphatases. FEBS J 2018; 285:3886-3908. [DOI: 10.1111/febs.14503] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 04/30/2018] [Accepted: 05/09/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Serge Hardy
- Rosalind and Morris Goodman Cancer Research Centre Montréal Canada
| | - Elie Kostantin
- Rosalind and Morris Goodman Cancer Research Centre Montréal Canada
- Department of Biochemistry McGill University Montréal Canada
| | - Teri Hatzihristidis
- Rosalind and Morris Goodman Cancer Research Centre Montréal Canada
- Department of Medicine Division of Experimental Medicine McGill University Montreal Canada
| | - Yevgen Zolotarov
- Rosalind and Morris Goodman Cancer Research Centre Montréal Canada
- Department of Biochemistry McGill University Montréal Canada
| | - Noriko Uetani
- Rosalind and Morris Goodman Cancer Research Centre Montréal Canada
| | - Michel L. Tremblay
- Rosalind and Morris Goodman Cancer Research Centre Montréal Canada
- Department of Biochemistry McGill University Montréal Canada
- Department of Medicine Division of Experimental Medicine McGill University Montreal Canada
| |
Collapse
|
28
|
Hirji N, Bradley PD, Li S, Vincent A, Pennesi ME, Thomas AS, Heon E, Bhan A, Mahroo OA, Robson A, Inglehearn CF, Moore AT, Michaelides M. Jalili Syndrome: Cross-sectional and Longitudinal Features of Seven Patients With Cone-Rod Dystrophy and Amelogenesis Imperfecta. Am J Ophthalmol 2018; 188:123-130. [PMID: 29421294 PMCID: PMC5873517 DOI: 10.1016/j.ajo.2018.01.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 01/22/2018] [Accepted: 01/23/2018] [Indexed: 12/18/2022]
Abstract
PURPOSE To characterize a series of 7 patients with cone-rod dystrophy (CORD) and amelogenesis imperfecta (AI) owing to confirmed mutations in CNNM4, first described as "Jalili Syndrome." DESIGN Retrospective observational case series. METHODS Seven patients from 6 families with Jalili Syndrome were identified at 3 tertiary referral centers. We systematically reviewed their available medical records, spectral-domain optical coherence tomography (SD-OCT), fundus autofluorescence imaging (FAF), color fundus photography, and electrophysiological assessments. RESULTS The mean age at presentation was 6.7 years (range 3-16 years), with 6 male and 1 female patient. CNNM4 mutations were identified in all patients. The mean Snellen best-corrected visual acuity (BCVA) at presentation was 20/246 (range 20/98 to 20/399) in the right eye and 20/252 (range 20/98 to 20/480) in the left. Nystagmus was observed in all 7 patients, and photophobia was present in 6. Funduscopic findings at presentation were variable, ranging from only mild disc pallor to retinal vascular attenuation and macular atrophy. Multimodal imaging demonstrated disease progression in all 7 patients over time. Electroretinography uniformly revealed progressive cone-rod dysfunction. CONCLUSIONS Jalili Syndrome is a rare CORD associated with AI. We have further characterized its ocular phenotype, including describing SD-OCT, FAF, and electrophysiological features; and report several novel disease-causing sequence variants. Moreover, this study presents novel longitudinal data demonstrating structural and functional progression over time, allowing better informed advice on prognosis.
Collapse
Affiliation(s)
- Nashila Hirji
- Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University College London, London, United Kingdom
| | - Patrick D Bradley
- Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University College London, London, United Kingdom
| | - Shuning Li
- Genetics and Genome Biology, Hospital for Sick Children, Toronto, Canada
| | - Ajoy Vincent
- Genetics and Genome Biology, Hospital for Sick Children, Toronto, Canada; Department of Ophthalmology and Vision Sciences, Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - Mark E Pennesi
- Oregon Health & Science University, Casey Eye Institute, Portland, Oregon
| | | | - Elise Heon
- Genetics and Genome Biology, Hospital for Sick Children, Toronto, Canada; Department of Ophthalmology and Vision Sciences, Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - Aparna Bhan
- Genetics and Genome Biology, Hospital for Sick Children, Toronto, Canada
| | - Omar A Mahroo
- Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University College London, London, United Kingdom
| | - Anthony Robson
- Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University College London, London, United Kingdom
| | | | - Anthony T Moore
- UCSF School of Medicine, Department of Ophthalmology, San Francisco, California
| | - Michel Michaelides
- Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University College London, London, United Kingdom.
| |
Collapse
|
29
|
Maia CMF, Machado RA, Gil-da-Silva-Lopes VL, Lustosa-Mendes E, Rim PHH, Dias VO, Martelli DRB, Nasser LS, Coletta RD, Martelli-Júnior H. Report of two unrelated families with Jalili syndrome and a novel nonsense heterozygous mutation in CNNM4 gene. Eur J Med Genet 2018; 61:384-387. [PMID: 29421602 DOI: 10.1016/j.ejmg.2018.02.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 01/10/2018] [Accepted: 02/03/2018] [Indexed: 12/18/2022]
Abstract
Jalili syndrome (JS) is an autosomal recessive disease characterized by a combination of cone-rode retinal dytrophy (CRD) and amelogenesis imperfect (AI). Mutations in cyclin and CBS domain divalent metal cation transport mediator 4 (CNNM4) gene cause JS. Here we described 2 families (3 members) affected by JS. In the first family, JS was caused by the homozygous p.Leu324Pro (c.971T > C) missense mutation and the affected patient developed both CRD and AI. In the second family, a specific combination of a compound heterozygous mutation was found - the p.Leu324Pro (c.971T > C) missense transition and the novel p.Tyr581* (c.1743C > G) nonsense mutation. The proband showed CRD and AI, but her father just developed eye alterations. Together, these findings suggest that the p.Leu324Pro mutation in homozygosis induces a complete phenotype with both CRD and AI, but in heterozygosis and in composition with the novel p.Tyr581* nonsense mutation in CNNM4 promotes variable clinical expressivity, particularly with lack of dental phenotypes. These different phenotypes could be explained by deletions affecting the proband's homologous allele, epistasia or interactions with environmental factors leading to residual activity of protein.
Collapse
Affiliation(s)
| | - Renato Assis Machado
- Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil.
| | | | - Elaine Lustosa-Mendes
- Department of Medical Genetics, School of Medical Sciences, University of Campinas, Campinas, São Paulo, Brazil
| | - Priscila Hae Hyun Rim
- Department of Medical Genetics, School of Medical Sciences, University of Campinas, Campinas, São Paulo, Brazil
| | - Verônica Oliveira Dias
- Health Science Program, State University of Montes Claros, Montes Claros, Minas Gerais, Brazil
| | | | - Luciano Sólia Nasser
- Health Science Program, State University of Montes Claros, Montes Claros, Minas Gerais, Brazil
| | - Ricardo D Coletta
- Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Hercílio Martelli-Júnior
- Health Science Program, State University of Montes Claros, Montes Claros, Minas Gerais, Brazil; Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| |
Collapse
|
30
|
Li S, Xi Q, Zhang X, Yu D, Li L, Jiang Z, Chen Q, Wang QK, Traboulsi EI. Identification of a mutation in CNNM4 by whole exome sequencing in an Amish family and functional link between CNNM4 and IQCB1. Mol Genet Genomics 2018; 293:699-710. [PMID: 29322253 DOI: 10.1007/s00438-018-1417-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 01/06/2018] [Indexed: 12/15/2022]
Abstract
We investigated an Amish family in which three siblings presented with an early-onset childhood retinal dystrophy inherited in an autosomal recessive fashion. Genome-wide linkage analysis identified significant linkage to marker D2S2216 on 2q11 with a two-point LOD score of 1.95 and a multi-point LOD score of 3.76. Whole exome sequencing was then performed for the three affected individuals and identified a homozygous nonsense mutation (c.C1813T, p.R605X) in the cyclin and CBS domain divalent metal cation transport mediator 4 (CNNM4) gene located within the 2p14-2q14 Jalili syndrome locus. The initial assessment and collection of the family were performed before the clinical delineation of Jalili syndrome. Another assessment was made after the discovery of the responsible gene and the dental abnormalities characteristic of Jalili syndrome were retrospectively identified. The p.R605X mutation represents the first probable founder mutation of Jalili syndrome identified in the Amish community. The molecular mechanism underlying Jalili syndrome is unknown. Here we show that CNNM4 interacts with IQCB1, which causes Leber congenital amaurosis (LCA) when mutated. A truncated CNNM4 protein starting at R605 significantly increased the rate of apoptosis, and significantly increased the interaction between CNNM4 and IQCB1. Mutation p.R605X may cause Jalili syndrome by a nonsense-mediated decay mechanism, affecting the function of IQCB1 and apoptosis, or both. Our data, for the first time, functionally link Jalili syndrome gene CNNM4 to LCA gene IQCB1, providing important insights into the molecular pathogenic mechanism of retinal dystrophy in Jalili syndrome.
Collapse
Affiliation(s)
- Sisi Li
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Center for Human Genome Research and Cardio-X Institute, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Quansheng Xi
- Department of Molecular Cardiology, Center for Cardiovascular Genetics, Cleveland Clinic Lerner Research Institute, Cleveland, OH, 44195, USA
| | - Xiaoyu Zhang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Center for Human Genome Research and Cardio-X Institute, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Dong Yu
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Center for Human Genome Research and Cardio-X Institute, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Lin Li
- Department of Molecular Cardiology, Center for Cardiovascular Genetics, Cleveland Clinic Lerner Research Institute, Cleveland, OH, 44195, USA
| | - Zhenyang Jiang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Center for Human Genome Research and Cardio-X Institute, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Qiuyun Chen
- Department of Molecular Cardiology, Center for Cardiovascular Genetics, Cleveland Clinic Lerner Research Institute, Cleveland, OH, 44195, USA
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Cleveland, USA
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH, 44195, USA
| | - Qing K Wang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Center for Human Genome Research and Cardio-X Institute, Huazhong University of Science and Technology, Wuhan, 430074, China.
- Department of Molecular Cardiology, Center for Cardiovascular Genetics, Cleveland Clinic Lerner Research Institute, Cleveland, OH, 44195, USA.
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Cleveland, USA.
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH, 44195, USA.
| | - Elias I Traboulsi
- Center for Genetic Eye Diseases, Cleveland Clinic Cole Eye Institute, Cleveland, OH, 44195, USA.
| |
Collapse
|
31
|
Bujakowska KM, Fernandez-Godino R, Place E, Consugar M, Navarro-Gomez D, White J, Bedoukian EC, Zhu X, Xie HM, Gai X, Leroy BP, Pierce EA. Copy-number variation is an important contributor to the genetic causality of inherited retinal degenerations. Genet Med 2017; 19:643-651. [PMID: 27735924 PMCID: PMC6377944 DOI: 10.1038/gim.2016.158] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 08/30/2016] [Indexed: 11/10/2022] Open
Abstract
PURPOSE Despite substantial progress in sequencing, current strategies can genetically solve only approximately 55-60% of inherited retinal degeneration (IRD) cases. This can be partially attributed to elusive mutations in the known IRD genes, which are not easily identified by the targeted next-generation sequencing (NGS) or Sanger sequencing approaches. We hypothesized that copy-number variations (CNVs) are a major contributor to the elusive genetic causality of IRDs. METHODS Twenty-eight cases previously unsolved with a targeted NGS were investigated with whole-genome single-nucleotide polymorphism (SNP) and comparative genomic hybridization (CGH) arrays. RESULTS Deletions in the IRD genes were detected in 5 of 28 families, including a de novo deletion. We suggest that the de novo deletion occurred through nonallelic homologous recombination (NAHR) and we constructed a genomic map of NAHR-prone regions with overlapping IRD genes. In this article, we also report an unusual case of recessive retinitis pigmentosa due to compound heterozygous mutations in SNRNP200, a gene that is typically associated with the dominant form of this disease. CONCLUSIONS CNV mapping substantially increased the genetic diagnostic rate of IRDs, detecting genetic causality in 18% of previously unsolved cases. Extending the search to other structural variations will probably demonstrate an even higher contribution to genetic causality of IRDs.Genet Med advance online publication 13 October 2016.
Collapse
Affiliation(s)
- Kinga M Bujakowska
- Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Rosario Fernandez-Godino
- Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Emily Place
- Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Mark Consugar
- Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Daniel Navarro-Gomez
- Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Joseph White
- Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| | - Emma C Bedoukian
- Ophthalmic Genetics &Visual Electrophysiology, Division of Ophthalmology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Xiaosong Zhu
- Ophthalmic Genetics &Visual Electrophysiology, Division of Ophthalmology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Hongbo M Xie
- Department of BioMedical Health Informatics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Xiaowu Gai
- Center for Personalized Medicine, Children's Hospital Los Angeles, Los Angeles, California, USA
| | - Bart P Leroy
- Ophthalmic Genetics &Visual Electrophysiology, Division of Ophthalmology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Department of Ophthalmology &Center for Medical Genetics, Ghent University Hospital &Ghent University, Ghent, Belgium
| | - Eric A Pierce
- Ocular Genomics Institute, Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA
| |
Collapse
|
32
|
Fukagawa T, Takafuji K, Tachibanaki S, Kawamura S. Purification of cone outer segment for proteomic analysis on its membrane proteins in carp retina. PLoS One 2017; 12:e0173908. [PMID: 28291804 PMCID: PMC5349680 DOI: 10.1371/journal.pone.0173908] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 02/28/2017] [Indexed: 11/18/2022] Open
Abstract
Rods and cones are both photoreceptors in the retina, but they are different in many aspects including the light response characteristics and, for example, cell morphology and metabolism. These differences would be caused by differences in proteins expressed in rods and cones. To understand the molecular bases of these differences between rods and cones, one of the ways is to compare proteins expressed in rods and cones, and to find those expressed specifically or dominantly. In the present study, we are interested in proteins in the outer segment (OS), the site responsible for generation of rod- or cone-characteristic light responses and also the site showing different morphology between rods and cones. For this, we established a method to purify the OS and the inner segment (IS) of rods and also of cones from purified carp rods and cones, respectively, using sucrose density gradient. In particular, we were interested in proteins tightly bound to the membranes of cone OS. To identify these proteins, we analyzed proteins in some selected regions of an SDS-gel of washed membranes of the OS and the IS obtained from both rods and cones, with Liquid Chromatography-tandem Mass Spectrometry (LC-MS/MS) using a protein database constructed from carp retina. By comparing the lists of the proteins found in the OS and the IS of both rods and cones, we found some proteins present in cone OS membranes specifically or dominantly, in addition to the proteins already known to be present specifically in cone OS.
Collapse
Affiliation(s)
- Takashi Fukagawa
- Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, Japan
| | - Kazuaki Takafuji
- Center of Medical Innovation and Translational Research, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Shuji Tachibanaki
- Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, Japan
- Department of Biological Sciences, Graduate School of Science, Osaka University, Suita, Osaka, Japan
- * E-mail: (ST); (SK)
| | - Satoru Kawamura
- Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, Japan
- Department of Biological Sciences, Graduate School of Science, Osaka University, Suita, Osaka, Japan
- * E-mail: (ST); (SK)
| |
Collapse
|
33
|
Duverger O, Ohara T, Bible PW, Zah A, Morasso MI. DLX3-Dependent Regulation of Ion Transporters and Carbonic Anhydrases is Crucial for Enamel Mineralization. J Bone Miner Res 2017; 32:641-653. [PMID: 27760456 PMCID: PMC11025043 DOI: 10.1002/jbmr.3022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 10/10/2016] [Accepted: 10/14/2016] [Indexed: 12/11/2022]
Abstract
Patients with tricho-dento-osseous (TDO) syndrome, an ectodermal dysplasia caused by mutations in the homeodomain transcription factor DLX3, exhibit enamel hypoplasia and hypomineralization. Here we used a conditional knockout mouse model to investigate the developmental and molecular consequences of Dlx3 deletion in the dental epithelium in vivo. Dlx3 deletion in the dental epithelium resulted in the formation of chalky hypomineralized enamel in all teeth. Interestingly, transcriptomic analysis revealed that major enamel matrix proteins and proteases known to be involved in enamel secretion and maturation were not affected significantly by Dlx3 deletion in the enamel organ. In contrast, expression of several ion transporters and carbonic anhydrases known to play an important role in enamel pH regulation during maturation was significantly affected in enamel organs lacking DLX3. Most of these affected genes showed binding of DLX3 to their proximal promoter as evidenced by chromatin immunoprecipitation sequencing (ChIP-seq) analysis on rat enamel organ. These molecular findings were consistent with altered pH staining evidenced by disruption of characteristic pH oscillations in the enamel. Taken together, these results show that DLX3 is indispensable for the regulation of ion transporters and carbonic anhydrases during the maturation stage of amelogenesis, exerting a crucial regulatory function on pH oscillations during enamel mineralization. © 2016 American Society for Bone and Mineral Research.
Collapse
Affiliation(s)
- Olivier Duverger
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Takahiro Ohara
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Paul W Bible
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Angela Zah
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Maria I Morasso
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| |
Collapse
|
34
|
Cherkaoui Jaouad I, Lyahyai J, Guaoua S, El Alloussi M, Zrhidri A, Doubaj Y, Boulanouar A, Sefiani A. Novel splice site mutation in CNNM4 gene in a family with Jalili syndrome. Eur J Med Genet 2017; 60:239-244. [PMID: 28246031 DOI: 10.1016/j.ejmg.2017.02.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 01/24/2017] [Accepted: 02/24/2017] [Indexed: 12/15/2022]
Abstract
Jalili syndrome is a rare autosomal recessive genetic disease characterized by the association of amelogenesis imperfecta and cone-rod retinal dystrophy. This syndrome is caused by mutations in the CNNM4 gene. Different types of CNNM4 mutations have been reported; missense, nonsense, large deletions, single base insertion, and duplication. We used Sanger sequencing to analyze a large consanguineous family with three siblings affected with Jalili syndrome, suspected clinically after dental and ophthalmological examination. These patients are carrying a novel homozygous mutation in the splice site acceptor of intron 3 (c.1682-1G > C) in the CNNM4 gene. We compare the findings of the present family to those from literature, in order to further delineate Jalili syndrome.
Collapse
Affiliation(s)
- Imane Cherkaoui Jaouad
- Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V, Rabat, Morocco; Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco.
| | - Jaber Lyahyai
- Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V, Rabat, Morocco
| | - Soukaina Guaoua
- Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V, Rabat, Morocco
| | - Mustapha El Alloussi
- Service d'odontologie Pédiatrique, Faculté de Médecine Dentaire, Université Mohammed V, Rabat, Morocco
| | - Abdelali Zrhidri
- Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V, Rabat, Morocco
| | - Yassamine Doubaj
- Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V, Rabat, Morocco; Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
| | | | - Abdelaziz Sefiani
- Centre de Génomique Humaine, Faculté de Médecine et de Pharmacie, Université Mohammed V, Rabat, Morocco; Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
| |
Collapse
|
35
|
Giménez-Mascarell P, Oyenarte I, Hardy S, Breiderhoff T, Stuiver M, Kostantin E, Diercks T, Pey AL, Ereño-Orbea J, Martínez-Chantar ML, Khalaf-Nazzal R, Claverie-Martin F, Müller D, Tremblay ML, Martínez-Cruz LA. Structural Basis of the Oncogenic Interaction of Phosphatase PRL-1 with the Magnesium Transporter CNNM2. J Biol Chem 2016; 292:786-801. [PMID: 27899452 DOI: 10.1074/jbc.m116.759944] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 11/28/2016] [Indexed: 12/21/2022] Open
Abstract
Phosphatases of regenerating liver (PRLs), the most oncogenic of all protein-tyrosine phosphatases (PTPs), play a critical role in metastatic progression of cancers. Recent findings established a new paradigm by uncovering that their association with magnesium transporters of the cyclin M (CNNM) family causes a rise in intracellular magnesium levels that promote oncogenic transformation. Recently, however, essential roles for regulation of the circadian rhythm and reproduction of the CNNM family have been highlighted. Here, we describe the crystal structure of PRL-1 in complex with the Bateman module of CNNM2 (CNNM2BAT), which consists of two cystathionine β-synthase (CBS) domains (IPR000664) and represents an intracellular regulatory module of the transporter. The structure reveals a heterotetrameric association, consisting of a disc-like homodimer of CNNM2BAT bound to two independent PRL-1 molecules, each one located at opposite tips of the disc. The structure highlights the key role played by Asp-558 at the extended loop of the CBS2 motif of CNNM2 in maintaining the association between the two proteins and proves that the interaction between CNNM2 and PRL-1 occurs via the catalytic domain of the phosphatase. Our data shed new light on the structural basis underlying the interaction between PRL phosphatases and CNNM transporters and provides a hypothesis about the molecular mechanism by which PRL-1, upon binding to CNNM2, might increase the intracellular concentration of Mg2+ thereby contributing to tumor progression and metastasis. The availability of this structure sets the basis for the rational design of compounds modulating PRL-1 and CNNM2 activities.
Collapse
Affiliation(s)
- Paula Giménez-Mascarell
- From the Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Technology Park of Bizkaia, 48160 Derio, Bizkaia, Spain
| | - Iker Oyenarte
- From the Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Technology Park of Bizkaia, 48160 Derio, Bizkaia, Spain
| | - Serge Hardy
- the Rosalind and Morris Goodman Cancer Research Centre
| | - Tilman Breiderhoff
- the Department of Pediatric Nephrology, Charité Universitäts Medizin, Berlin, 13353 Berlin, Germany.,the Berlin Institute of Health, Berlin, Germany
| | - Marchel Stuiver
- the In-Cell NMR Laboratory, Department of NMR-supported Structural Biology, Leibniz Institute of Molecular Pharmacology (FMP Berlin), Robert-Rössle Strasse 10, 13125 Berlin, Germany
| | - Elie Kostantin
- the Rosalind and Morris Goodman Cancer Research Centre.,Department of Biochemistry, and
| | - Tammo Diercks
- From the Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Technology Park of Bizkaia, 48160 Derio, Bizkaia, Spain
| | - Angel L Pey
- the Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071 Granada, Spain
| | - June Ereño-Orbea
- From the Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Technology Park of Bizkaia, 48160 Derio, Bizkaia, Spain
| | - María Luz Martínez-Chantar
- the Metabolomics Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Technology Park of Bizkaia, 48160 Derio, Bizkaia, Spain
| | - Reham Khalaf-Nazzal
- the Department of Biomedical Sciences, An-Najah National University, P. O. Box 7, Nablus, Palestinian Territory, and
| | - Felix Claverie-Martin
- the Research Unit, Nuestra Señora de Candelaria University Hospital, 38010 Santa Cruz de Tenerife, Spain
| | - Dominik Müller
- the Department of Pediatric Nephrology, Charité Universitäts Medizin, Berlin, 13353 Berlin, Germany,
| | - Michel L Tremblay
- the Rosalind and Morris Goodman Cancer Research Centre, .,Department of Biochemistry, and.,Division of Experimental Medicine, Department of Medicine, McGill University, Montreal, Quebec H3A 1A3, Canada
| | - Luis Alfonso Martínez-Cruz
- From the Structural Biology Unit, Center for Cooperative Research in Biosciences (CIC bioGUNE), Technology Park of Bizkaia, 48160 Derio, Bizkaia, Spain,
| |
Collapse
|
36
|
Blanco-Sánchez B, Clément A, Phillips JB, Westerfield M. Zebrafish models of human eye and inner ear diseases. Methods Cell Biol 2016; 138:415-467. [PMID: 28129854 DOI: 10.1016/bs.mcb.2016.10.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Eye and inner ear diseases are the most common sensory impairments that greatly impact quality of life. Zebrafish have been intensively employed to understand the fundamental mechanisms underlying eye and inner ear development. The zebrafish visual and vestibulo-acoustic systems are very similar to these in humans, and although not yet mature, they are functional by 5days post-fertilization (dpf). In this chapter, we show how the zebrafish has significantly contributed to the field of biomedical research and how researchers, by establishing disease models and meticulously characterizing their phenotypes, have taken the first steps toward therapies. We review here models for (1) eye diseases, (2) ear diseases, and (3) syndromes affecting eye and/or ear. The use of new genome editing technologies and high-throughput screening systems should increase considerably the speed at which knowledge from zebrafish disease models is acquired, opening avenues for better diagnostics, treatments, and therapies.
Collapse
Affiliation(s)
| | - A Clément
- University of Oregon, Eugene, OR, United States
| | | | | |
Collapse
|
37
|
A novel mutation and variable phenotypic expression in a large consanguineous pedigree with Jalili syndrome. Eye (Lond) 2016; 30:1424-1432. [PMID: 27419834 DOI: 10.1038/eye.2016.137] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 05/07/2016] [Indexed: 11/08/2022] Open
Abstract
PurposeJalili syndrome is an autosomal recessive disorder characterized by simultaneous appearance of cone-rod dystrophy (CRD) and amelogenesis imperfecta (AI). Mutations in CNNM4 gene have been identified as the underlying cause of the syndrome. In this study, we investigated a large affected family to identify the causative mutation.Patients and MethodsA seven-generation family with 24 members affected with Jalili syndrome were enrolled in the study. Comprehensive ophthalmologic and dental examinations were performed on them. The entire coding region of CNNM4 gene was sequenced for detection of potential mutations.ResultsOcular examinations showed nystagmus and photophobia along with early onset visual impairment. Fundoscopic exams revealed a spectrum of macular dystrophies in different family members, from macular coloboma and advanced form of beaten bronze macular dystrophy (bull's eye) to milder form of macular thinning along with a range of pigmentary changes and vascular attenuation in the posterior pole and periphery. Scotopic and photopic electro-retinographic responses (ERGs) were extinguished or significantly depressed. Mutation analysis revealed a novel mutation (c.1091delG) in homozygous form in the patients and as a heterozygous form in the normal carrier subjects.ConclusionWe identified a novel homozygous deleterious mutation in CNNM4 gene which causes Jalili syndrome.
Collapse
|
38
|
Topçu V, Alp MY, Alp CK, Bakır A, Geylan D, Yılmazoğlu MÖ. A new familial case of Jalili syndrome caused by a novel mutation in CNNM4. Ophthalmic Genet 2016; 38:161-166. [PMID: 27070327 DOI: 10.3109/13816810.2016.1164192] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Jalili syndrome (JS) is a rare autosomal recessive disorder characterized by the combination of cone-rod dystrophy (CRD) and amelogenesis imperfecta. To date, 18 families with JS have been reported, 16 of which were found to have a mutation in CNNM4. We describe three siblings with clinical features of JS with a homozygous missense mutation in exon 4 of CNNM4, c.1781A>G (p.N594S). They demonstrated phenotypic variability in terms of ocular and dental findings. Although fundus examination and optical coherence tomography results were normal, the electroretinogram was compatible with CRD, supporting the diagnosis of JS. The dental phenotype severity also varied among the siblings.
Collapse
Affiliation(s)
- Vehap Topçu
- a Department of Medical Genetics , Zekai Tahir Burak Maternity Teaching Hospital , Ankara , Turkey
| | - Muhammed Yunus Alp
- b Genetic Diagnostic Center, Dışkapı Yıldırım Beyazıt Training and Research Hospital , Ankara , Turkey
| | - Cemile Kedici Alp
- c Department of Restorative Dentistry, Faculty of Dentistry , Gazi University , Ankara , Turkey
| | - Abdullatif Bakır
- a Department of Medical Genetics , Zekai Tahir Burak Maternity Teaching Hospital , Ankara , Turkey
| | - Dilay Geylan
- a Department of Medical Genetics , Zekai Tahir Burak Maternity Teaching Hospital , Ankara , Turkey
| | | |
Collapse
|
39
|
Prasad MK, Geoffroy V, Vicaire S, Jost B, Dumas M, Le Gras S, Switala M, Gasse B, Laugel-Haushalter V, Paschaki M, Leheup B, Droz D, Dalstein A, Loing A, Grollemund B, Muller-Bolla M, Lopez-Cazaux S, Minoux M, Jung S, Obry F, Vogt V, Davideau JL, Davit-Beal T, Kaiser AS, Moog U, Richard B, Morrier JJ, Duprez JP, Odent S, Bailleul-Forestier I, Rousset MM, Merametdijan L, Toutain A, Joseph C, Giuliano F, Dahlet JC, Courval A, El Alloussi M, Laouina S, Soskin S, Guffon N, Dieux A, Doray B, Feierabend S, Ginglinger E, Fournier B, de la Dure Molla M, Alembik Y, Tardieu C, Clauss F, Berdal A, Stoetzel C, Manière MC, Dollfus H, Bloch-Zupan A. A targeted next-generation sequencing assay for the molecular diagnosis of genetic disorders with orodental involvement. J Med Genet 2016; 53:98-110. [PMID: 26502894 PMCID: PMC4752661 DOI: 10.1136/jmedgenet-2015-103302] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Revised: 09/08/2015] [Accepted: 09/24/2015] [Indexed: 11/23/2022]
Abstract
BACKGROUND Orodental diseases include several clinically and genetically heterogeneous disorders that can present in isolation or as part of a genetic syndrome. Due to the vast number of genes implicated in these disorders, establishing a molecular diagnosis can be challenging. We aimed to develop a targeted next-generation sequencing (NGS) assay to diagnose mutations and potentially identify novel genes mutated in this group of disorders. METHODS We designed an NGS gene panel that targets 585 known and candidate genes in orodental disease. We screened a cohort of 101 unrelated patients without a molecular diagnosis referred to the Reference Centre for Oro-Dental Manifestations of Rare Diseases, Strasbourg, France, for a variety of orodental disorders including isolated and syndromic amelogenesis imperfecta (AI), isolated and syndromic selective tooth agenesis (STHAG), isolated and syndromic dentinogenesis imperfecta, isolated dentin dysplasia, otodental dysplasia and primary failure of tooth eruption. RESULTS We discovered 21 novel pathogenic variants and identified the causative mutation in 39 unrelated patients in known genes (overall diagnostic rate: 39%). Among the largest subcohorts of patients with isolated AI (50 unrelated patients) and isolated STHAG (21 unrelated patients), we had a definitive diagnosis in 14 (27%) and 15 cases (71%), respectively. Surprisingly, COL17A1 mutations accounted for the majority of autosomal-dominant AI cases. CONCLUSIONS We have developed a novel targeted NGS assay for the efficient molecular diagnosis of a wide variety of orodental diseases. Furthermore, our panel will contribute to better understanding the contribution of these genes to orodental disease. TRIAL REGISTRATION NUMBERS NCT01746121 and NCT02397824.
Collapse
Affiliation(s)
- Megana K Prasad
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Serge Vicaire
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Bernard Jost
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Michael Dumas
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Stéphanie Le Gras
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Marzena Switala
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Barbara Gasse
- Evolution et Développement du Squelette-EDS, UMR7138-SAE, Université Pierre et Marie Curie, Paris, France
| | - Virginie Laugel-Haushalter
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
| | - Marie Paschaki
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
| | - Bruno Leheup
- Faculté de Médecine, CHU de Nancy, Université de Lorraine, Vandoeuvre-Les-Nancy, France
| | | | | | - Adeline Loing
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
| | - Bruno Grollemund
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Michèle Muller-Bolla
- Départment d'Odontologie Pédiatrique, UFR d'Odontologie, Université de Nice Sophia-Antipolis, CHU de Nice, Nice, France
- URB2i—EA 4462, Paris Descartes, Paris, France
| | - Séréna Lopez-Cazaux
- Faculté de Chirurgie Dentaire, Département d'Odontologie Pédiatrique, CHU Hotel Dieu, Service d'odontologie conservatrice et pédiatrique, Nantes, France
| | - Maryline Minoux
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Sophie Jung
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Frédéric Obry
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Vincent Vogt
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Jean-Luc Davideau
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Tiphaine Davit-Beal
- Evolution et Développement du Squelette-EDS, UMR7138-SAE, Université Pierre et Marie Curie, Paris, France
- Faculté de Chirurgie Dentaire, Département d'Odontologie Pédiatrique, Université Paris Descartes, Montrouge, France
| | | | - Ute Moog
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - Béatrice Richard
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Jean-Jacques Morrier
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Jean-Pierre Duprez
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Sylvie Odent
- Service de Génétique Clinique, CHU de Rennes, Rennes, France
| | - Isabelle Bailleul-Forestier
- Faculté de Chirurgie Dentaire, CHU de Toulouse, Odontologie Pédiatrique, Université Paul Sabatier, Toulouse, France
| | - Monique Marie Rousset
- Unité Fonctionnelle d'Odontologie pédiatrique, Service d'odontologie, CHRU de Lille, Lille, France
| | - Laure Merametdijan
- Faculté de Chirurgie Dentaire, Service d'Odontologie Conservatrice et Endodontie, CHU Nantes, Université de Nantes, France
| | | | - Clara Joseph
- Départment d'Odontologie Pédiatrique, Université de Nice Sophia-Antipolis, CHU Nice, Nice, France
| | | | - Jean-Christophe Dahlet
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
| | - Aymeric Courval
- Pôle de Médecine et de Chirurgie Bucco-dentaire, Hôpital Civil, HUS, Strasbourg, France
| | - Mustapha El Alloussi
- Faculty of Dental Medicine, Department of Pediatric Dentistry, University Mohammed V Rabat, Morocco
| | - Samir Laouina
- Faculty of Dental Medicine, Department of Pediatric Dentistry, University Mohammed V Rabat, Morocco
| | - Sylvie Soskin
- Pédiatrie 1, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | - Anne Dieux
- Service de génétique clinique Guy Fontaine, Centre Hospitalier Régionale Universitaire (CHRU) de Lille, Lille, France
| | - Bérénice Doray
- Service de Génétique Médicale, CHU de Strasbourg, Strasbourg, France
| | - Stephanie Feierabend
- Klinik für Zahnerhaltungskunde und Parodontologie, Universitats Klinikum, Freiburg, Germany
| | | | - Benjamin Fournier
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Muriel de la Dure Molla
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Yves Alembik
- Service de Génétique Médicale, CHU de Strasbourg, Strasbourg, France
| | - Corinne Tardieu
- Aix-Marseille Université, UMR 7268 ADES/EFS/CNRS, APHM, Hôpital Timone, Service Odontologie, Marseille, France
| | - François Clauss
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Ariane Berdal
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Marie Cécile Manière
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
- Service de Génétique Médicale, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique, HUS, Strasbourg, France
| | - Agnès Bloch-Zupan
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
| |
Collapse
|
40
|
Purwar P, Sareen S, Bhartiya K, Sayed Inayatullah SR, Bansal M, Chahal V, Gupta SK, Dixit J, Sheel V, Rai P. Jalili syndrome presenting with situs inversus totalis and keratoconus: the first case in the Indian subcontinent. Oral Surg Oral Med Oral Pathol Oral Radiol 2015; 120:e210-8. [DOI: 10.1016/j.oooo.2015.04.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 04/02/2015] [Accepted: 04/09/2015] [Indexed: 11/29/2022]
|
41
|
Melin L, Lundgren J, Malmberg P, Norén JG, Taube F, Cornell DH. XRMA and ToF-SIMS Analysis of Normal and Hypomineralized Enamel. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2015; 21:407-421. [PMID: 25674916 DOI: 10.1017/s1431927615000033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Molar incisor hypomineralization (MIH) is a developmental disturbance of the enamel. This study presents analyses of hypomineralized and normal enamel in first molar teeth diagnosed with MIH, utilizing time-of-flight secondary ion mass spectrometry area analyses and X-ray microanalysis of area and spot profiles in uncoated samples between gold lines which provide electrical conductivity. Statistical analysis of mean values allows discrimination of normal from MIH enamel, which has higher Mg and lower Na and P. Inductive analysis using complete data sets for profiles from the enamel surface to the enamel-dentin junction found that Mg, Cl and position in the profile provide useful discrimination criteria. Element profiles provide a visual complement to the inductive analysis and several elements also provide insight into the development of both normal and MIH enamel. The higher Mg content and different Cl profiles of hypomineralized enamel compared with normal enamel are probably related to a relatively short period during the development of ameloblasts between birth and the 1st year of life.
Collapse
Affiliation(s)
- Lisa Melin
- 1Department of Pediatric Dentistry,Institute of Odontology at the Sahlgrenska Academy,University of Gothenburg,P.O. Box 450,SE 405 30 Gothenburg,Sweden
| | - Jesper Lundgren
- 2Department of Psychology,University of Gothenburg,P.O. Box 500,SE 405 30 Gothenburg,Sweden
| | - Per Malmberg
- 3Department of Chemical and Biological Engineering,Chalmers University of Technology,Kemivägen 10,412 96 Gothenburg,Sweden
| | - Jörgen G Norén
- 1Department of Pediatric Dentistry,Institute of Odontology at the Sahlgrenska Academy,University of Gothenburg,P.O. Box 450,SE 405 30 Gothenburg,Sweden
| | - Fabian Taube
- 4Department of Occupational and Environmental Medicine,Sahlgrenska University Hospital,P.O. Box 414,SE 405 30 Gothenburg,Sweden
| | - David H Cornell
- 5Department of Earth Sciences,University of Gothenburg,P.O. Box 460,SE 405 30 Gothenburg,Sweden
| |
Collapse
|
42
|
Nash BM, Wright DC, Grigg JR, Bennetts B, Jamieson RV. Retinal dystrophies, genomic applications in diagnosis and prospects for therapy. Transl Pediatr 2015; 4:139-63. [PMID: 26835369 PMCID: PMC4729094 DOI: 10.3978/j.issn.2224-4336.2015.04.03] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Retinal dystrophies (RDs) are degenerative diseases of the retina which have marked clinical and genetic heterogeneity. Common presentations among these disorders include night or colour blindness, tunnel vision and subsequent progression to complete blindness. The known causative disease genes have a variety of developmental and functional roles with mutations in more than 120 genes shown to be responsible for the phenotypes. In addition, mutations within the same gene have been shown to cause different disease phenotypes, even amongst affected individuals within the same family highlighting further levels of complexity. The known disease genes encode proteins involved in retinal cellular structures, phototransduction, the visual cycle, and photoreceptor structure or gene regulation. This review aims to demonstrate the high degree of genetic complexity in both the causative disease genes and their associated phenotypes, highlighting the more common clinical manifestation of retinitis pigmentosa (RP). The review also provides insight to recent advances in genomic molecular diagnosis and gene and cell-based therapies for the RDs.
Collapse
Affiliation(s)
- Benjamin M Nash
- 1 Eye Genetics Research Group, Children's Medical Research Institute, University of Sydney, The Children's Hospital at Westmead and Save Sight Institute, Sydney, NSW, Australia ; 2 Sydney Genome Diagnostics, The Children's Hospital at Westmead, Sydney, NSW, Australia ; 3 Discipline of Paediatrics and Child Health, Sydney Medical School, University of Sydney, NSW, Australia
| | - Dale C Wright
- 1 Eye Genetics Research Group, Children's Medical Research Institute, University of Sydney, The Children's Hospital at Westmead and Save Sight Institute, Sydney, NSW, Australia ; 2 Sydney Genome Diagnostics, The Children's Hospital at Westmead, Sydney, NSW, Australia ; 3 Discipline of Paediatrics and Child Health, Sydney Medical School, University of Sydney, NSW, Australia
| | - John R Grigg
- 1 Eye Genetics Research Group, Children's Medical Research Institute, University of Sydney, The Children's Hospital at Westmead and Save Sight Institute, Sydney, NSW, Australia ; 2 Sydney Genome Diagnostics, The Children's Hospital at Westmead, Sydney, NSW, Australia ; 3 Discipline of Paediatrics and Child Health, Sydney Medical School, University of Sydney, NSW, Australia
| | - Bruce Bennetts
- 1 Eye Genetics Research Group, Children's Medical Research Institute, University of Sydney, The Children's Hospital at Westmead and Save Sight Institute, Sydney, NSW, Australia ; 2 Sydney Genome Diagnostics, The Children's Hospital at Westmead, Sydney, NSW, Australia ; 3 Discipline of Paediatrics and Child Health, Sydney Medical School, University of Sydney, NSW, Australia
| | - Robyn V Jamieson
- 1 Eye Genetics Research Group, Children's Medical Research Institute, University of Sydney, The Children's Hospital at Westmead and Save Sight Institute, Sydney, NSW, Australia ; 2 Sydney Genome Diagnostics, The Children's Hospital at Westmead, Sydney, NSW, Australia ; 3 Discipline of Paediatrics and Child Health, Sydney Medical School, University of Sydney, NSW, Australia
| |
Collapse
|
43
|
de Baaij JHF, Hoenderop JGJ, Bindels RJM. Magnesium in man: implications for health and disease. Physiol Rev 2015; 95:1-46. [PMID: 25540137 DOI: 10.1152/physrev.00012.2014] [Citation(s) in RCA: 870] [Impact Index Per Article: 96.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Magnesium (Mg(2+)) is an essential ion to the human body, playing an instrumental role in supporting and sustaining health and life. As the second most abundant intracellular cation after potassium, it is involved in over 600 enzymatic reactions including energy metabolism and protein synthesis. Although Mg(2+) availability has been proven to be disturbed during several clinical situations, serum Mg(2+) values are not generally determined in patients. This review aims to provide an overview of the function of Mg(2+) in human health and disease. In short, Mg(2+) plays an important physiological role particularly in the brain, heart, and skeletal muscles. Moreover, Mg(2+) supplementation has been shown to be beneficial in treatment of, among others, preeclampsia, migraine, depression, coronary artery disease, and asthma. Over the last decade, several hereditary forms of hypomagnesemia have been deciphered, including mutations in transient receptor potential melastatin type 6 (TRPM6), claudin 16, and cyclin M2 (CNNM2). Recently, mutations in Mg(2+) transporter 1 (MagT1) were linked to T-cell deficiency underlining the important role of Mg(2+) in cell viability. Moreover, hypomagnesemia can be the consequence of the use of certain types of drugs, such as diuretics, epidermal growth factor receptor inhibitors, calcineurin inhibitors, and proton pump inhibitors. This review provides an extensive and comprehensive overview of Mg(2+) research over the last few decades, focusing on the regulation of Mg(2+) homeostasis in the intestine, kidney, and bone and disturbances which may result in hypomagnesemia.
Collapse
Affiliation(s)
- Jeroen H F de Baaij
- Department of Physiology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Joost G J Hoenderop
- Department of Physiology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | - René J M Bindels
- Department of Physiology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| |
Collapse
|
44
|
Taube F, Marczewski M, Norén J. Deviations of inorganic and organic carbon content in hypomineralised enamel. J Dent 2015; 43:269-78. [DOI: 10.1016/j.jdent.2014.09.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 08/27/2014] [Accepted: 09/05/2014] [Indexed: 11/15/2022] Open
|
45
|
Nucleotide binding triggers a conformational change of the CBS module of the magnesium transporter CNNM2 from a twisted towards a flat structure. Biochem J 2015; 464:23-34. [PMID: 25184538 DOI: 10.1042/bj20140409] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Recent studies suggest CNNM2 (cyclin M2) to be part of the long-sought basolateral Mg2+ extruder at the renal distal convoluted tubule, or its regulator. In the present study, we explore structural features and ligand-binding capacities of the Bateman module of CNNM2 (residues 429-584), an intracellular domain structurally equivalent to the region involved in Mg2+ handling by the bacterial Mg2+ transporter MgtE, and AMP binding by the Mg2+ efflux protein CorC. Additionally, we studied the structural impact of the pathogenic mutation T568I located in this region. Our crystal structures reveal that nucleotides such as AMP, ADP or ATP bind at only one of the two cavities present in CNNM2429-584. Mg2+ favours ATP binding by alleviating the otherwise negative charge repulsion existing between acidic residues and the polyphosphate group of ATP. In crystals CNNM2429-584 forms parallel dimers, commonly referred to as CBS (cystathionine β-synthase) modules. Interestingly, nucleotide binding triggers a conformational change in the CBS module from a twisted towards a flat disc-like structure that mostly affects the structural elements connecting the Bateman module with the transmembrane region. We furthermore show that the T568I mutation, which causes dominant hypomagnesaemia, mimics the structural effect induced by nucleotide binding. The results of the present study suggest that the T568I mutation exerts its pathogenic effect in humans by constraining the conformational equilibrium of the CBS module of CNNM2, which becomes 'locked' in its flat form.
Collapse
|
46
|
Gerth-Kahlert C, Seebauer B, Dold S, Hanson JVM, Wildberger H, Spörri A, van Waes H, Berger W. Intra-familial phenotype variability in patients with Jalili syndrome. Eye (Lond) 2015; 29:712-6. [PMID: 25613845 DOI: 10.1038/eye.2014.314] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- C Gerth-Kahlert
- Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland
| | - B Seebauer
- 1] Institute of Medical Molecular Genetics, Zurich, Switzerland [2] Neuroscience Center Zurich, University and ETH Zurich, Zurich, Switzerland
| | - S Dold
- 1] Institute of Medical Molecular Genetics, Zurich, Switzerland [2] Neuroscience Center Zurich, University and ETH Zurich, Zurich, Switzerland
| | - J V M Hanson
- Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland
| | - H Wildberger
- Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland
| | - A Spörri
- Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, Zurich, Switzerland
| | - H van Waes
- Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, Zurich, Switzerland
| | - W Berger
- 1] Institute of Medical Molecular Genetics, Zurich, Switzerland [2] Neuroscience Center Zurich, University and ETH Zurich, Zurich, Switzerland [3] Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| |
Collapse
|
47
|
Hirata Y, Funato Y, Takano Y, Miki H. Mg2+-dependent interactions of ATP with the cystathionine-β-synthase (CBS) domains of a magnesium transporter. J Biol Chem 2014; 289:14731-9. [PMID: 24706765 DOI: 10.1074/jbc.m114.551176] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Ancient conserved domain protein/cyclin M (CNNM) family proteins are evolutionarily conserved Mg(2+) transporters. However, their biochemical mechanism of action remains unknown. Here, we show the functional importance of the commonly conserved cystathionine-β-synthase (CBS) domains and reveal their unique binding ability to ATP. Deletion mutants of CNNM2 and CNNM4, lacking the CBS domains, are unable to promote Mg(2+) efflux. Furthermore, the substitution of one amino acid residue in the CBS domains of CNNM2, which is associated with human hereditary hypomagnesemia, abrogates Mg(2+) efflux. Binding analyses reveal that the CBS domains of CNNM2 bind directly to ATP and not AMP in a manner dependent on the presence of Mg(2+), which is inhibited in a similar pattern by the disease-associated amino acid substitution. The requirement of Mg(2+) for these interactions is a unique feature among CBS domains, which can be explained by the presence of highly electronegative surface potentials around the ATP binding site on CNNM2. These results demonstrate that the CBS domains play essential roles in Mg(2+) efflux, probably through interactions with ATP. Interactions with ATP, which mostly forms complexes with Mg(2+) in cells, may account for the rapid Mg(2+) transport by CNNM family proteins.
Collapse
Affiliation(s)
- Yusuke Hirata
- From the Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan and
| | - Yosuke Funato
- From the Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan and
| | - Yu Takano
- the Laboratory of Protein Informatics, Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hiroaki Miki
- From the Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan and
| |
Collapse
|
48
|
Identity-by-descent-guided mutation analysis and exome sequencing in consanguineous families reveals unusual clinical and molecular findings in retinal dystrophy. Genet Med 2014; 16:671-80. [PMID: 24625443 DOI: 10.1038/gim.2014.24] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 02/05/2014] [Indexed: 01/26/2023] Open
Abstract
PURPOSE Autosomal recessive retinal dystrophies are clinically and genetically heterogeneous, which hampers molecular diagnosis. We evaluated identity-by-descent-guided Sanger sequencing or whole-exome sequencing in 26 families with nonsyndromic (19) or syndromic (7) autosomal recessive retinal dystrophies to identify disease-causing mutations. METHODS Patients underwent genome-wide identity-by-descent mapping followed by Sanger sequencing (16) or whole-exome sequencing (10). Whole-exome sequencing data were filtered against identity-by-descent regions and known retinal dystrophy genes. The medical history was reviewed in mutation-positive families. RESULTS We identified mutations in 14 known retinal dystrophy genes in 20/26 (77%) families: ABCA4, CERKL, CLN3, CNNM4, C2orf71, IQCB1, LRAT, MERTK, NMNAT1, PCDH15, PDE6B, RDH12, RPGRIP1, and USH2A. Whole-exome sequencing in single individuals revealed mutations in either the largest or smaller identity-by-descent regions, and a compound heterozygous genotype in NMNAT1. Moreover, a novel deletion was found in PCDH15. In addition, we identified mutations in CLN3, CNNM4, and IQCB1 in patients initially diagnosed with nonsyndromic retinal dystrophies. CONCLUSION Our study emphasized that identity-by-descent-guided mutation analysis and/or whole-exome sequencing are powerful tools for the molecular diagnosis of retinal dystrophy. Our approach uncovered unusual molecular findings and unmasked syndromic retinal dystrophies, guiding future medical management. Finally, elucidating ABCA4, LRAT, and MERTK mutations offers potential gene-specific therapeutic perspectives.
Collapse
|
49
|
Basolateral Mg2+ extrusion via CNNM4 mediates transcellular Mg2+ transport across epithelia: a mouse model. PLoS Genet 2013; 9:e1003983. [PMID: 24339795 PMCID: PMC3854942 DOI: 10.1371/journal.pgen.1003983] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Accepted: 10/15/2013] [Indexed: 12/24/2022] Open
Abstract
Transcellular Mg2+ transport across epithelia, involving both apical entry and basolateral extrusion, is essential for magnesium homeostasis, but molecules involved in basolateral extrusion have not yet been identified. Here, we show that CNNM4 is the basolaterally located Mg2+ extrusion molecule. CNNM4 is strongly expressed in intestinal epithelia and localizes to their basolateral membrane. CNNM4-knockout mice showed hypomagnesemia due to the intestinal malabsorption of magnesium, suggesting its role in Mg2+ extrusion to the inner parts of body. Imaging analyses revealed that CNNM4 can extrude Mg2+ by exchanging intracellular Mg2+ with extracellular Na+. Furthermore, CNNM4 mutations cause Jalili syndrome, characterized by recessive amelogenesis imperfecta with cone-rod dystrophy. CNNM4-knockout mice showed defective amelogenesis, and CNNM4 again localizes to the basolateral membrane of ameloblasts, the enamel-forming epithelial cells. Missense point mutations associated with the disease abolish the Mg2+ extrusion activity. These results demonstrate the crucial importance of Mg2+ extrusion by CNNM4 in organismal and topical regulation of magnesium. Magnesium is an essential element for living organisms. Its absorption occurs at the intestine through the barrier comprised of epithelial cells. In this process, transcellular Mg2+ transport across epithelia, involving both entry from one side and extrusion from the other side, is important. Previous studies have revealed the role of Mg2+-permeable channel protein in Mg2+ entry into the epithelial cells. However, the identity of proteins involved in Mg2+ extrusion to the inner parts of body has remained unknown. Mice genetically engineered not to express CNNM4, which localizes to the epithelial membrane facing to the inner parts of body, show hypomagnesemia due to the defect in magnesium absorption. Functional analyses using culture cells directly reveal that CNNM4 can extrude intracellular Mg2+ to the outside of cells. These results indicate that CNNM4 mediates transcellular Mg2+ transport across the intestinal epithelia. Furthermore, we also show that these CNNM4-lacking mice also have a defect in amelogenesis, which is consistent with the disease symptoms of Jalili syndrome that is known to be caused by mutations in the CNNM4 gene.
Collapse
|
50
|
Ereño-Orbea J, Oyenarte I, Martínez-Cruz LA. CBS domains: Ligand binding sites and conformational variability. Arch Biochem Biophys 2013; 540:70-81. [DOI: 10.1016/j.abb.2013.10.008] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 10/08/2013] [Accepted: 10/11/2013] [Indexed: 02/07/2023]
|