1
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Chang X, Ji C, Zhang T, Huang H. Prenatal to preimplantation genetic diagnosis of a novel compound heterozygous mutation in HSPA9 associated with Even-Plus syndrome. Clin Chim Acta 2024; 555:117803. [PMID: 38281662 DOI: 10.1016/j.cca.2024.117803] [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: 12/24/2023] [Revised: 01/21/2024] [Accepted: 01/23/2024] [Indexed: 01/30/2024]
Abstract
BACKGROUND Heat shock protein family A member 9 (HSPA9) prevents unfolded and dysfunctional protein accumulation, with genetic variants known to be pathogenic. Here, we determined the genetic cause of Even-Plus syndrome (OMIM: 616854) in a Chinese family. METHODS We collected samples from two affected and two normal individuals. Whole-exome sequencing was performed to identify their genetic profiles. Potential variants were validated using Sanger sequencing. Assisted reproduction with mutation-free embryos successfully blocked the transmission of mutations. RESULTS We identified novel inherited pathogenic complex heterozygous variations in the HSPA9 gene in the two affected fetuses. Three-dimensional spatial simulation of the HSPA9 protein after prediction of the mutated RNA splicing pattern abolished part of the substrate-binding domain of the protein. According to ACMG guidelines, c. 1822-1G>A and c. 1411-3T>G were classified as pathogenic and likely pathogenic, respectively. Mutation-free embryos were selected for transplantation and reconfirmed to possess no mutations. A healthy daughter was successfully born into the family. CONCLUSIONS This study is the first to report complex heterozygous variations in the HSPA9 gene that influence alternative splicing in early pregnancy. Our findings expand on the mutational spectrum leading to Even-Plus syndrome and provide a basis for genetic counseling and future embryonic studies.
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Affiliation(s)
- Xiaoxia Chang
- Department of Pediatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China; Department of Obstetrics and Gynecology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Chunmin Ji
- Department of Obstetrics and Gynecology, Air Force Hospital of Eastern Theater, Nanjing, Jiangsu Province, China
| | - Ting Zhang
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Huan Huang
- Department of Pediatrics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China; Department of Obstetrics and Gynecology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China.
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2
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Liu M, Li H, Ren S, Ding C. A new phenotype of EVEN-PLUS syndrome in a Chinese family and literature review. Mol Genet Genomic Med 2024; 12:e2335. [PMID: 38284453 PMCID: PMC10797836 DOI: 10.1002/mgg3.2335] [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: 06/01/2023] [Revised: 10/19/2023] [Accepted: 11/28/2023] [Indexed: 01/30/2024] Open
Abstract
BACKGROUND Epiphyseal, Vertebral, Ear, and Nose (EVEN)-PLUS syndrome is a rare condition characterized by the involvement of the Epiphyses, Vertebrae, Ears, and Nose, plus other associated findings, due to pathogenic variants in the HSPA9 gene. Due to the sparse number of patients, the clinical phenotypic spectrum is not clear. METHODS We report two patients with pathogenic HSPA9 variants from a Chinese family. Besides the core clinical features of EVEN-PLUS syndrome, the two cases had seizures, developmental delay, and basal ganglia lesions in cerebral MRI. We also reviewed the previously published reports of patients with biallelic pathogenic HSPA9 variants. RESULTS Together with the presented cases, 12 cases (9 females) were identified from 6 relevant research items for analysis. All patients had synophrys or arched eyebrows, hypoplastic or dysplastic ears, hypoplastic nasal bone, and dysplastic femoral head. Other specific craniofacial features (such as triangular nares), abnormal skeletal presentations (such as bifid femur, dysplastic epiphyses at the knee, dysplastic acetabula, delayed ossification, short stature, vertebral clefting, scoliosis, and dislocated patellae), congenital heart defects, and renal alterations are common clinical features. Two patients had seizures and basal ganglia lesions in cerebral MRI. Infrequent features, such as aplasia cutis, short thorax and sternum, and widely spaced nipples, are also observed in the syndrome. Thirteen variants associated with EVEN-PLUS syndrome have been reported. CONCLUSIONS HSPA9 gene mutations should be suspected in all cases with specific craniofacial features, abnormal skeletal presentations, congenital heart defects, and renal alterations. Seizures and basal ganglia lesions are a new phenotype of EVEN-PLUS syndrome.
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Affiliation(s)
- Ming Liu
- Department of Neurology, Beijing Children's Hospital, Capital Medical UniversityNational Center for Children's HealthBeijingChina
| | - Huanhuan Li
- Department of NeurologyBaoding Children's HospitalBaodingHebei ProvinceChina
| | - Shuhong Ren
- Department of NeurologyBaoding Children's HospitalBaodingHebei ProvinceChina
| | - Changhong Ding
- Department of Neurology, Beijing Children's Hospital, Capital Medical UniversityNational Center for Children's HealthBeijingChina
- Department of NeurologyBaoding Children's HospitalBaodingHebei ProvinceChina
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3
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Li H, Ma B, Kong Y, Zheng H, Zhang X. Identifying patients with EVEN-plus syndrome using exome sequencing and clinical feature analysis: A case report. Mol Genet Genomic Med 2022; 10:e2039. [PMID: 36052765 PMCID: PMC9651607 DOI: 10.1002/mgg3.2039] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 07/15/2022] [Accepted: 07/29/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND The EVEN-plus syndrome (epiphyseal-vertebral-ear-nose dysplasia plus associated findings) is an extremely rare autosomal recessive inherited disease characterised by specific facial features and skeletal dysplasia. It has a prenatal onset due to defects in the HSPA9 gene. The syndrome has not been reported previously in China. METHODS This study reported the characteristics, examination results, diagnosis and treatment of a female case aged 3 years and 3 months. RESULTS The patient had global developmental delay and specific facial features, including a prominent forehead, a bilateral auricle deformity, a collapsed nose, a high palatine arch, a short neck and other appearance abnormalities. Her hip joint magnetic resonance imaging (MRI) results showed bilateral femoral head epiphyseal dysplasia with a fork-shaped malformation at the distal end, and her brain MRI showed white matter myelin dysplasia. HSPA9 compound heterozygous variants c.882_c.883delAG and c.613A>G were identified by exome sequencing. CONCLUSIONS This finding expands the spectra of EVEN-plus syndrome phenotype and pathogenic variants and suggests that c.882_c.883delAG may have a higher distribution frequency in East Asian populations.
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Affiliation(s)
- Hua‐Wei Li
- Department of PediatricsThe First Affiliated Hospital of Henan University of Traditional Chinese MedicineZhengzhouChina
| | - Bing‐Xiang Ma
- Department of PediatricsThe First Affiliated Hospital of Henan University of Traditional Chinese MedicineZhengzhouChina
| | - Ya‐Min Kong
- Department of PediatricsThe First Affiliated Hospital of Henan University of Traditional Chinese MedicineZhengzhouChina
| | - Hong Zheng
- Department of PediatricsThe First Affiliated Hospital of Henan University of Traditional Chinese MedicineZhengzhouChina
| | - Xue‐Yuan Zhang
- Department of PediatricsThe First Affiliated Hospital of Henan University of Traditional Chinese MedicineZhengzhouChina
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4
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Pacio-Miguez M, Parrón-Pajares M, Gordon CT, Santos-Simarro F, Rodríguez Jiménez C, Mena R, Rueda Arenas I, F Montaño VE, Fernández M, Solís M, Del Pozo Á, Amiel J, García-Miñaur S, Palomares-Bralo M. Broadening the phenotypic spectrum of EVEN-PLUS syndrome through identification of HSPA9 pathogenic variants in the original EVE dysplasia family and two sibs with milder facial phenotype. Am J Med Genet A 2022; 188:2819-2824. [PMID: 35779070 DOI: 10.1002/ajmg.a.62883] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 05/25/2022] [Accepted: 06/13/2022] [Indexed: 01/25/2023]
Abstract
EVEN-PLUS syndrome is a rare autosomal recessive disorder caused by biallelic pathogenic variants in the mitochondrial chaperone called mortalin, encoded by HSPA9. This genetic disorder, presenting with several overlapping features with CODAS syndrome, is characterized by the involvement of the Epiphyses, Vertebrae, Ears, and Nose (EVEN), PLUS associated findings. Only five individuals presenting with the EVEN-PLUS phenotype and biallelic variants in HSPA9 have been published. Here, we expand the phenotypic and molecular spectrum associated with this disorder, reporting two sibs with a milder phenotype and compound heterozygous pathogenic variants (a recurrent variant and a novel one). Also, we confirm a homozygous pathogenic variant in the family originally reported as EVE dysplasia.
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Affiliation(s)
- Marta Pacio-Miguez
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - Manuel Parrón-Pajares
- Servicio de Radiodiagnóstico. Hospital Universitario La Paz, Madrid, Spain.,Skeletal Dysplasia Multidisciplinary Unit (UMDE) and European Reference Network on Rare Bone Diseases ERN-BOND, Hospital Universitario La Paz, Madrid, Spain
| | - Christopher T Gordon
- INSERM U1163, Université de Paris, Institut Imagine, Paris, France.,Service de Génomique des Maladies Rares, Hôpital Necker Enfants Malades, APHP, Paris, France
| | - Fernando Santos-Simarro
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain.,Skeletal Dysplasia Multidisciplinary Unit (UMDE) and European Reference Network on Rare Bone Diseases ERN-BOND, Hospital Universitario La Paz, Madrid, Spain.,ITHACA-European Reference Network, Madrid, Spain
| | | | - Rocio Mena
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain
| | - Inmaculada Rueda Arenas
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain
| | | | - María Fernández
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain
| | - Mario Solís
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain
| | - Ángela Del Pozo
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - Jeanne Amiel
- INSERM U1163, Université de Paris, Institut Imagine, Paris, France.,Service de Génomique des Maladies Rares, Hôpital Necker Enfants Malades, APHP, Paris, France
| | - Sixto García-Miñaur
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain.,ITHACA-European Reference Network, Madrid, Spain
| | - María Palomares-Bralo
- Instituto de Genética Médica y Molecular (INGEMM), Hospital Universitario La Paz, Madrid, Spain.,CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain.,ITHACA-European Reference Network, Madrid, Spain.,Universidad Rey Juan Carlos, Madrid, Spain
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5
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Yokoyama T, Fujii S, Ostermann A, Schrader TE, Nabeshima Y, Mizuguchi M. Neutron crystallographic analysis of the nucleotide-binding domain of Hsp72 in complex with ADP. IUCRJ 2022; 9:562-572. [PMID: 36071806 PMCID: PMC9438496 DOI: 10.1107/s2052252522006297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 06/14/2022] [Indexed: 06/15/2023]
Abstract
The 70 kDa heat-shock proteins (Hsp70s) are ATP-dependent molecular chaperones that contain an N-terminal nucleotide-binding domain (NBD) and a C-terminal substrate-binding domain. Hsp70s bind to misfolded/unfolded proteins and thereby prevent their aggregation. The ATP hydrolysis reaction in the NBD plays a key role in allosteric control of the binding of substrate proteins. In the present study, the neutron crystal structure of the NBD of Hsp72, a heat-inducible Hsp70 family member, was solved in complex with ADP in order to study the structure-function relationship with a focus on hydrogens. ADP bound to Hsp72 was fully deprotonated, and the catalytically important residues, including Asp10, Asp199 and Asp206, are also deprotonated. Neutron analysis also enabled the characterization of the water clusters in the NBD. Enzymatic assays and X-ray crystallographic analysis revealed that the Y149A mutation exhibited a higher ATPase activity and caused disruption of the water cluster and incorporation of an additional magnesium ion. Tyr149 was suggested to contribute to the low intrinsic ATPase activity and to stabilize the water cluster. Collectively, these structural studies will help to elucidate the molecular basis of the function of Hsp72.
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Affiliation(s)
- Takeshi Yokoyama
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugkitani, Toyama 930-0914, Japan
| | - Shiho Fujii
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugkitani, Toyama 930-0914, Japan
| | - Andreas Ostermann
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universtät München, Lichtenbergstrasse 1, 85748 Garching, Germany
| | - Tobias E. Schrader
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstrasse 1, 85748 Garching, Germany
| | - Yuko Nabeshima
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugkitani, Toyama 930-0914, Japan
| | - Mineyuki Mizuguchi
- Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugkitani, Toyama 930-0914, Japan
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6
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Keller A, Bakhtina AA, Chavez JD, Bruce JE. Improved Interpretation of Protein Conformational Differences and Ligand Occupancy in Large-Scale Cross-Link Data. J Proteome Res 2022; 21:1475-1484. [PMID: 35594376 DOI: 10.1021/acs.jproteome.2c00109] [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: 11/28/2022]
Abstract
Chemical cross-linking of proteins in complex samples, cells, or even tissues is emerging to provide unique structural information on proteins and complexes that exist within native or nativelike environments. The public database XLinkDB automatically maps cross-links to available structures based on sequence homology. Structures most likely to reflect protein conformations in the cross-linked sample are routinely identified by having cross-linked residues separated by Euclidean distances within the maximum span of the applied cross-linker. Solvent accessible surface distance (SASD), which considers the accessibility of the cross-linked residues and the path connecting them, is a better predictor of consistency than the Euclidean distance. However, SASDs of structures are not publicly available, and their calculation is computationally intensive. Here, we describe in XLinkDB version 4.0 the automatic calculation of SASDs using Jwalk for all cross-links mapped to structures, both with and without regard to ligands, and derive empirical maximum SASD spans for BDP-NHP and DSSO cross-linkers of 51 and 43 Å, respectively. We document ligands proximal to cross-links in structures and demonstrate how SASDs can be used to help infer sample protein conformations and ligand occupancy, highlighting cross-links sensitive to ADP binding in mitochondria isolated from HEK293 cells.
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Affiliation(s)
- Andrew Keller
- Department of Genome Sciences, University of Washington, Seattle, Washington 98105, United States
| | - Anna A Bakhtina
- Department of Genome Sciences, University of Washington, Seattle, Washington 98105, United States
| | - Juan D Chavez
- Department of Genome Sciences, University of Washington, Seattle, Washington 98105, United States
| | - James E Bruce
- Department of Genome Sciences, University of Washington, Seattle, Washington 98105, United States
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7
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Skeletal Phenotypes Due to Abnormalities in Mitochondrial Protein Homeostasis and Import. Int J Mol Sci 2020; 21:ijms21218327. [PMID: 33171986 PMCID: PMC7664180 DOI: 10.3390/ijms21218327] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 10/28/2020] [Accepted: 11/03/2020] [Indexed: 12/19/2022] Open
Abstract
Mitochondrial disease represents a collection of rare genetic disorders caused by mitochondrial dysfunction. These disorders can be quite complex and heterogeneous, and it is recognized that mitochondrial disease can affect any tissue at any age. The reasons for this variability are not well understood. In this review, we develop and expand a subset of mitochondrial diseases including predominantly skeletal phenotypes. Understanding how impairment ofdiverse mitochondrial functions leads to a skeletal phenotype will help diagnose and treat patients with mitochondrial disease and provide additional insight into the growing list of human pathologies associated with mitochondrial dysfunction. The underlying disease genes encode factors involved in various aspects of mitochondrial protein homeostasis, including proteases and chaperones, mitochondrial protein import machinery, mediators of inner mitochondrial membrane lipid homeostasis, and aminoacylation of mitochondrial tRNAs required for translation. We further discuss a complex of frequently associated phenotypes (short stature, cataracts, and cardiomyopathy) potentially explained by alterations to steroidogenesis, a process regulated by mitochondria. Together, these observations provide novel insight into the consequences of impaired mitochondrial protein homeostasis.
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8
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Younger G, Vetrini F, Weaver DD, Lynnes TC, Treat K, Pratt VM, Torres-Martinez W. EVEN-PLUS syndrome: A case report with novel variants in HSPA9 and evidence of HSPA9 gene dysfunction. Am J Med Genet A 2020; 182:2501-2507. [PMID: 32869452 DOI: 10.1002/ajmg.a.61808] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/23/2020] [Accepted: 06/30/2020] [Indexed: 11/06/2022]
Abstract
EVEN-PLUS syndrome is a rare condition characterized by its involvement of the Epiphyses, Vertebrae, Ears, and Nose, PLUS other associated findings. We report here the fifth case of EVEN-PLUS syndrome with novel variants c.818 T > G (p.L273X) and c.955C > T (p.L319F) in the HSPA9 gene identified through whole-exome sequencing. The patient is the first male known to be affected and presented with additional features not previously described with EVEN-PLUS syndrome. These features include agenesis of the septum pellucidum, a short chest and sternum, 13 pairs of ribs, a single hemivertebra, laterally displaced nipples, hydronephrosis, unilateral cryptorchidism, unilateral single palmar crease, bilateral clubfoot, and hypotonia. qPCR analysis provides supporting evidence for a nonsense-mediated decay mechanism for the HSPA9 truncating variant. In silico 3D modeling supports the pathogenicity of the c.955C > T (p.L319F) missense variant. The study presented here further describes the syndrome and broadens its mutational and phenotypic spectrum. Our study also lends support to HSPA9 variants as the underlying etiology of EVEN-PLUS syndrome and ultimately provides a better understanding of the molecular basis of the condition.
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Affiliation(s)
- Georgianne Younger
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Francesco Vetrini
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - David D Weaver
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Ty C Lynnes
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Kayla Treat
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Victoria M Pratt
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Wilfredo Torres-Martinez
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
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9
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Macario AJ, de Macario EC. Molecular mechanisms in chaperonopathies: clues to understanding the histopathological abnormalities and developing novel therapies. J Pathol 2019; 250:9-18. [PMID: 31579936 DOI: 10.1002/path.5349] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 09/02/2019] [Accepted: 09/17/2019] [Indexed: 12/13/2022]
Abstract
Molecular chaperones, many of which are heat shock proteins (Hsps), are components of the chaperoning system and when defective can cause disease, the chaperonopathies. Chaperone-gene variants cause genetic chaperonopathies, whereas in the acquired chaperonopathies the genes are normal, but their protein products are not, due to aberrant post-transcriptional mechanisms, e.g. post-translational modifications (PTMs). Since the chaperoning system is widespread in the body, chaperonopathies affect various tissues and organs, making these diseases of interest to a wide range of medical specialties. Genetic chaperonopathies are uncommon but the acquired ones are frequent, encompassing various types of cancer, and inflammatory and autoimmune disorders. The clinical picture of chaperonopathies is known. Much less is known on the impact that pathogenic mutations and PTMs have on the properties and functions of chaperone molecules. Elucidation of these molecular alterations is necessary for understanding the mechanisms underpinning the tissue and organ abnormalities occurring in patients. To illustrate this issue, we discuss structural-functional alterations caused by mutation in the chaperones CCT5 and HSPA9, and PTM effects on Hsp60. The data provide insights into what may happen when CCT5 and HSPA9 malfunction in patients, e.g. accumulation of cytotoxic protein aggregates with tissue destruction; or for Hsp60 with aberrant PTM, degradation and/or secretion of the chaperonin with mitochondrial damage. These and other possibilities are now open for investigation. © 2019 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Alberto Jl Macario
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore-Institute of Marine and Environmental Technology (IMET), Columbus Center, Baltimore, MD, USA.,Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Everly Conway de Macario
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore-Institute of Marine and Environmental Technology (IMET), Columbus Center, Baltimore, MD, USA.,Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
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10
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Moseng MA, Nix JC, Page RC. 2- and N6-functionalized adenosine-5'-diphosphate analogs for the inhibition of mortalin. FEBS Lett 2019; 593:2030-2039. [PMID: 31177526 DOI: 10.1002/1873-3468.13475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 11/11/2022]
Abstract
Our early efforts to find a covalent inhibitor of mortalin, a member of the 70 kD heat shock protein (Hsp70) family, led us to solve the structure of the mortalin nucleotide-binding domain (NBD) in complex with N6-propargyladenosine-5'-diphosphate. The acquired structure emphasizes the ability of the nucleotide-binding pocket to accommodate modified ADP compounds. A library of ADP analogs modified at either the 2- or N6-positions of adenosine was screened against the mortalin-NBD. Competitive inhibition and binding assays of the analogs demonstrate that modifications at the 2- or N6-positions have potential to bind and inhibit mortalin uniquely compared to other Hsp70 homologs, and that modifications at the 2-position confer the greatest selectivity in binding and inhibition of the mortalin-NBD.
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Affiliation(s)
- Mitchell A Moseng
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH, USA
| | - Jay C Nix
- Molecular Biology Consortium, Beamline 4.2.2, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Richard C Page
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH, USA
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