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Bakar A, Shams S, Bibi N, Ullah A, Ahmad W, Jelani M, Muthaffar OY, Abdulkareem AA, Abujamel TS, Haque A, Naseer MI, Khan B. A Novel Homozygous Nonsense Variant in the DYM Underlies Dyggve-Melchior-Clausen Syndrome in Large Consanguineous Family. Genes (Basel) 2023; 14:510. [PMID: 36833437 PMCID: PMC9956627 DOI: 10.3390/genes14020510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/09/2023] [Accepted: 02/15/2023] [Indexed: 02/19/2023] Open
Abstract
(1) Background: Dyggve-Melchior-Clausen Syndrome is a skeletal dysplasia caused by a defect in the DYM gene (OMIM number 607461). Pathogenic variants in the gene have been reported to cause Dyggve-Melchior-Clausen (DMC; OMIM 223800) dysplasia and Smith-McCort (SMC; OMIM 607326) dysplasia. (2) Methods: In the present study, large consanguineous families with five affected individuals with osteochondrodysplasia phenotypes were recruited. The family members were analyzed by polymerase chain reaction for homozygosity mapping using highly polymorphic microsatellite markers. Subsequent to linkage analysis, the coding exons and exon intron border of the DYM gene were amplified. The amplified products were then sent for Sanger sequencing. The structural effect of the pathogenic variant was analyzed by different bioinformatics tools. (3) Results: Homozygosity mapping revealed a 9 Mb homozygous region on chromosome 18q21.1 harboring DYM shared by all available affected individuals. Sanger sequencing of the coding exons and exon intron borders of the DYM gene revealed a novel homozygous nonsense variant [DYM (NM_017653.6):c.1205T>A, p.(Leu402Ter)] in affected individuals. All the available unaffected individuals were either heterozygous or wild type for the identified variant. The identified mutation results in loss of protein stability and weekend interactions with other proteins making them pathogenic (4) Conclusions: This is the second nonsense mutation reported in a Pakistani population causing DMC. The study presented would be helpful in prenatal screening, genetic counseling, and carrier testing of other members in the Pakistani community.
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Affiliation(s)
- Abu Bakar
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan 23200, Pakistan
| | - Sulaiman Shams
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan 23200, Pakistan
| | - Nousheen Bibi
- Department of Bioinformatics, Shaheed Benazir Bhutto Women University, Peshawar 25120, Pakistan
| | - Asmat Ullah
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
- Department of Biochemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan
| | - Wasim Ahmad
- Department of Biochemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan
| | - Musharraf Jelani
- Rare Diseases Genetics and Genomics, Centre for Omic Sciences, Islamia College Peshawar, Peshawar 25120, Pakistan
| | - Osama Yousef Muthaffar
- Department of Pediatrics, Faculty of Medicine, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Angham Abdulrhman Abdulkareem
- Faculty of Science, Department of Biochemistry, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Turki S. Abujamel
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Vaccines and Immunotherapy Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Absarul Haque
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21859, Saudi Arabia
| | - Muhammad Imran Naseer
- Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Bushra Khan
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan 23200, Pakistan
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Varshney K, Narayanachar SG, Girisha KM, Bhavani GS, Narayanan D, Phadke S, Nampoothiri S, Udupi GA, Raghupathy P, Nair M, Geetha TS, Bhat M. Clinical, radiological and molecular studies in 24 individuals with Dyggve-Melchior-Clausen dysplasia and Smith-McCort dysplasia from India. J Med Genet 2023; 60:204-211. [PMID: 35477554 DOI: 10.1136/jmedgenet-2021-108098] [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: 07/22/2021] [Accepted: 04/10/2022] [Indexed: 01/27/2023]
Abstract
BACKGROUND Dyggve-Melchior-Clausen dysplasia (DMC) and Smith-McCort dysplasia (SMC types 1 and 2) are rare spondyloepimetaphyseal dysplasias with identical radiological findings. The presence of intellectual disability in DMC and normal intellect in SMC differentiates the two. DMC and SMC1 are allelic and caused by homozygous or compound heterozygous variants in DYM. SMC2 is caused by variations in RAB33B. Both DYM and RAB33B are important in intravesicular transport and function in the Golgi apparatus. METHODS Detailed clinical phenotyping and skeletal radiography followed by molecular testing were performed in all affected individuals. Next-generation sequencing and Sanger sequencing were used to confirm DYM and RAB33B variants. Sanger sequencing of familial variants was done in all parents. RESULTS 24 affected individuals from seven centres are described. 18 had DMC and 6 had SMC2. Parental consanguinity was present in 15 of 19 (79%). Height <3 SD and gait abnormalities were seen in 20 and 14 individuals, respectively. The characteristic radiological findings of lacy iliac crests and double-humped vertebral bodies were seen in 96% and 88% of the affected. Radiological findings became attenuated with age. 23 individuals harboured biallelic variants in either DYM or RAB33B. Fourteen different variants were identified, out of which 10 were novel. The most frequently occurring variants in this group were c.719 C>A (3), c.1488_1489del (2), c.1484dup (2) and c.1563+2T>C (2) in DYM and c.400C>T (2) and c.186del (2) in RAB33B. The majority of these have not been reported previously. CONCLUSION This large cohort from India contributes to the increasing knowledge of clinical and molecular findings in these rare 'Golgipathies'.
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Affiliation(s)
- Kruti Varshney
- Department of Clinical Genetics, Centre for Human Genetics, Bangalore, Karnataka, India
| | | | - Katta M Girisha
- Department of Medical Genetics, Kasturba Medical College Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Gandham SriLakshmi Bhavani
- Department of Medical Genetics, Kasturba Medical College Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Dhanyalakshmi Narayanan
- Department of Medical Genetics, Kasturba Medical College Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Shubha Phadke
- Department of Medical Genetics, SGPGIMS, Lucknow, Uttar Pradesh, India
| | - Sheela Nampoothiri
- Department of Pediatric Genetics, Amrita Institute of Medical Sciences and Reseacrh Centre, Kochi, Kerala, India
| | - Gautham Arunachal Udupi
- Department of Human Genetics, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India
| | - Palany Raghupathy
- Department of Paediatric Endocrinology, Indira Gandhi Institute of Child Health, Bangalore, Karnataka, India
| | - Mohandas Nair
- Department of Paediatrics, Government Medical College, Kozhikode, Kerala, India
| | | | - Meenakshi Bhat
- Department of Clinical Genetics, Centre for Human Genetics, Bangalore, Karnataka, India
- Department of Paediatric Genetics, Indira Gandhi Institute of Child Health, Bangalore, Karnataka, India
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Obara K, Abe E, Toyoshima I. Dyggve-Melchior-Clausen Syndrome Caused by a Novel Frameshift Variant in a Japanese Patient. Mol Syndromol 2022; 13:350-359. [PMID: 36158050 PMCID: PMC9421667 DOI: 10.1159/000521516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 12/15/2021] [Indexed: 01/03/2023] Open
Abstract
Introduction Dyggve-Melchior-Clausen syndrome (DMC) is a rare autosomal recessive spondyloepimetaphyseal dysplasia characterized by short stature, microcephaly, intellectual disability, and coarse face. This disorder is caused by pathogenic/likely pathogenic variants of the DYM gene which encodes dymeclin. Case Presentation Herein, we report a 60-year-old Japanese man who was born to consanguineous parents. He presented with abdominal distention and rectal prolapse in addition to the common features of DMC. We identified a novel homozygous frameshift variant [c.1670delT, p.(Leu557Argfs*20)] in the DYM gene, which introduces a premature stop codon. Histological analysis revealed disarrangement of actin filaments in cultured fibroblasts. Discussion To the best of our knowledge, this is the first Japanese case of DMC with a confirmed variant in the DYM gene. This report provides more information about the geographic distribution and phenotypic spectrum of DMC. Moreover, it presents a novel DYM variant and insights about DMC pathology that may be associated with the disarrangement of actin filaments.
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Hellicar J, Stevenson NL, Stephens DJ, Lowe M. Supply chain logistics - the role of the Golgi complex in extracellular matrix production and maintenance. J Cell Sci 2022; 135:273996. [PMID: 35023559 PMCID: PMC8767278 DOI: 10.1242/jcs.258879] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The biomechanical and biochemical properties of connective tissues are determined by the composition and quality of their extracellular matrix. This, in turn, is highly dependent on the function and organisation of the secretory pathway. The Golgi complex plays a vital role in directing matrix output by co-ordinating the post-translational modification and proteolytic processing of matrix components prior to their secretion. These modifications have broad impacts on the secretion and subsequent assembly of matrix components, as well as their function in the extracellular environment. In this Review, we highlight the role of the Golgi in the formation of an adaptable, healthy matrix, with a focus on proteoglycan and procollagen secretion as example cargoes. We then discuss the impact of Golgi dysfunction on connective tissue in the context of human disease and ageing.
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Affiliation(s)
- John Hellicar
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, The Michael Smith Building, Oxford Road, Manchester, M13 9PT, UK.,Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore, 138673
| | - Nicola L Stevenson
- Cell Biology Laboratories, School of Biochemistry, Faculty of Life Sciences, University Walk, University of Bristol, Bristol, BS8 1TD, UK
| | - David J Stephens
- Cell Biology Laboratories, School of Biochemistry, Faculty of Life Sciences, University Walk, University of Bristol, Bristol, BS8 1TD, UK
| | - Martin Lowe
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, The Michael Smith Building, Oxford Road, Manchester, M13 9PT, UK
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Tüysüz B, Geyik F, Yıldırım T, Alkaya DU, Sharifova S, Kafadar A. Seven patients with Smith-McCort dysplasia 2: Four novel nonsense variants in RAB33B and follow-up findings. Eur J Med Genet 2021; 64:104248. [PMID: 34000439 DOI: 10.1016/j.ejmg.2021.104248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 05/10/2021] [Accepted: 05/10/2021] [Indexed: 12/15/2022]
Abstract
Smith-McCort dysplasia 2 (SMC2) is a rare spondylo-epiphyseal-metaphyseal dysplasia caused by biallelic RAB33B variants. Short trunk dwarfism and radiological findings including the lacy ilia appearance and double bumps of the vertebral bodies are typical features. To date, only eight patients with SMC2 had been reported. The aim of this study is to evaluate the follow-up findings of seven patients from five families with SMC2 and to present four novel variants in RAB33B. The age of diagnosis of the patients was between 4 and 18 years. All patients had variable degrees of short trunk dwarfism with barrel chest, waddling gait, hyperlordosis, genu valgum, elbow and finger joint stiffness, which became more evident with growth. Lacy iliac crest, short ilia with basilar hypoplasia, platyspondyly, dysplastic acetabulum with small and/or laterally displaced femoral heads, and small, irregular carpal bones were detected on skeletal radiographies of all patients. Typical double hump appearance of vertebral bodies was present in patients under 12 years of age, which disappeared after puberty and development of elongated vertebral bodies was also observed. At the time of diagnosis, six patients were able to walk independently; patients who were followed for five to nine years, developed severe hip pain, hip and knee joints stiffness and difficultly of walking after 10 years of age. Only two patients could walk independently during final examination. We detected four novel nonsense variants (p.Gln85Ter, p. Cys48Ter, p. Arg94Ter and p. Gln134Ter) in RAB33B. This study provides important data on long-term skeletal findings of the patients with SMC2.
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Affiliation(s)
- Beyhan Tüysüz
- Department of Pediatric Genetics, Istanbul University-Cerrahpaşa, Cerrahpaşa Medical Faculty, Istanbul, Turkey.
| | - Filiz Geyik
- Department of Pediatric Genetics, Istanbul University-Cerrahpaşa, Cerrahpaşa Medical Faculty, Istanbul, Turkey
| | - Timur Yıldırım
- Department of Orthopedics and Traumatology, University of Health Sciences Turkey, Baltalimani Bone Diseases Training and Research Center, Istanbul, Turkey
| | - Dilek Uludağ Alkaya
- Department of Pediatric Genetics, Istanbul University-Cerrahpaşa, Cerrahpaşa Medical Faculty, Istanbul, Turkey
| | - Sabine Sharifova
- Department of Pediatric Genetics, Istanbul University-Cerrahpaşa, Cerrahpaşa Medical Faculty, Istanbul, Turkey
| | - Ali Kafadar
- Department of Neurosurgery, Istanbul University-Cerrahpaşa, Cerrahpaşa Medical Faculty, Istanbul, Turkey
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A homozygous nonsense variant in DYM underlies Dyggve-Melchior-Clausen syndrome associated with ectodermal features. Mol Biol Rep 2020; 47:7083-7088. [PMID: 32886330 DOI: 10.1007/s11033-020-05774-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 08/28/2020] [Indexed: 10/23/2022]
Abstract
Dyggve melchior clausen syndrome (DMC, MIM 223800) is a very rare autosomal recessive form of skeletal dysplasia associated with various degrees of mental retardation. It is characterized by a progressive spondyloepimetaphyseal dysplasia (SEMD) with disproportionate short stature, generalized platyspondyly and lacy iliac crest. Here, we report characterization of large consanguineous family segregating DMC in autosomal recessive manner. Scanning SNP-based human genome identified a 5.3 Mb homozygous region on chromosome 18q21.1-q21.2. Sanger sequencing of the DYM gene, located in the homozygous region, revealed a novel homozygous nonsense variant [c.59 T > A; p.(Leu20*)] in affected members of the family. Analysis of the mRNA, extracted from hair follicles of an affected individual, suggested non-sense mediated decay (NMD) of the truncated transcript. This is the first nonsense and fourth loss of function variant in the DYM gene, causing DMC, reported in the Pakistani population. This study not only extended spectrum of the mutations in the DYM gene but will also facilitate diagnosis of similar other cases in Pakistani population.
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7
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Salian S, Cho TJ, Phadke SR, Gowrishankar K, Bhavani GS, Shukla A, Jagadeesh S, Kim OH, Nishimura G, Girisha KM. Additional three patients with Smith-McCort dysplasia due to novel RAB33B mutations. Am J Med Genet A 2017; 173:588-595. [PMID: 28127940 DOI: 10.1002/ajmg.a.38064] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 11/14/2016] [Indexed: 11/06/2022]
Abstract
Smith-McCort dysplasia (SMC OMIM 615222) and Dyggve-Melchior-Clausen dysplasia (DMC OMIM 223800) are allelic skeletal dysplasias caused by homozygous or compound heterozygous mutations in DYM (OMIM 607461). Both disorders share the same skeletal phenotypes characterized by spondylo-epi-metaphyseal dysplasia with distinctive lacy ilia. The difference rests on the presence or absence of intellectual disability, that is, intellectual disability in DMC and normal cognition in SMC. However, genetic heterogeneity was suspected in SMC. Recently, RAB33B (OMIM 605950) has been identified as the second gene for SMC. Nevertheless, only two affected families have been reported so far. Here we present three SMC patients with four novel pathogenic variants in RAB33B, including homozygosity for c.211C>T (p.R71*), homozygosity for c.365T>C (p.F122S), and compound heterozygosity for c.48delCGGGGCAG (p.G17Vfs*58) and c.490C>T (p.Q164*). We also summarize the clinical, radiological, and mutation profile of RAB33B after literature mining. This report ascertains the pathogenic relationship between RAB33B and SMC. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Smrithi Salian
- Department of Medical Genetics, Kasturba Medical College, Manipal University, Manipal, India
| | - Tae-Joon Cho
- Division of Pediatric Orthopedics, Seoul National University Children's Hospital, Seoul, Korea
| | - Shubha R Phadke
- Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Kalpana Gowrishankar
- Department of Medical Genetics, Apollo Children's Hospital, Chennai, Tamilnadu, India
| | | | - Anju Shukla
- Department of Medical Genetics, Kasturba Medical College, Manipal University, Manipal, India
| | | | - Ok-Hwa Kim
- Department of Radiology, Woorisoa Children's Hospital, Seoul, Korea
| | - Gen Nishimura
- Department of Pediatric Imaging, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan
| | - Katta M Girisha
- Department of Medical Genetics, Kasturba Medical College, Manipal University, Manipal, India
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Dupuis N, Fafouri A, Bayot A, Kumar M, Lecharpentier T, Ball G, Edwards D, Bernard V, Dournaud P, Drunat S, Vermelle-Andrzejewski M, Vilain C, Abramowicz M, Désir J, Bonaventure J, Gareil N, Boncompain G, Csaba Z, Perez F, Passemard S, Gressens P, El Ghouzzi V. Dymeclin deficiency causes postnatal microcephaly, hypomyelination and reticulum-to-Golgi trafficking defects in mice and humans. Hum Mol Genet 2015; 24:2771-83. [PMID: 25652408 DOI: 10.1093/hmg/ddv038] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 01/31/2015] [Indexed: 01/02/2023] Open
Abstract
Dymeclin is a Golgi-associated protein whose deficiency causes Dyggve-Melchior-Clausen syndrome (DMC, MIM #223800), a rare recessively inherited spondyloepimetaphyseal dysplasia consistently associated with postnatal microcephaly and intellectual disability. While the skeletal phenotype of DMC patients has been extensively described, very little is known about their cerebral anomalies, which result in brain growth defects and cognitive dysfunction. We used Dymeclin-deficient mice to determine the cause of microcephaly and to identify defective mechanisms at the cellular level. Brain weight and volume were reduced in all mutant mice from postnatal day 5 onward. Mutant mice displayed a narrowing of the frontal cortex, although cortical layers were normally organized. Interestingly, the corpus callosum was markedly thinner, a characteristic we also identified in DMC patients. Consistent with this, the myelin sheath was thinner, less compact and not properly rolled, while the number of mature oligodendrocytes and their ability to produce myelin basic protein were significantly decreased. Finally, cortical neurons from mutant mice and primary fibroblasts from DMC patients displayed substantially delayed endoplasmic reticulum to Golgi trafficking, which could be fully rescued upon Dymeclin re-expression. These findings indicate that Dymeclin is crucial for proper myelination and anterograde neuronal trafficking, two processes that are highly active during postnatal brain maturation.
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Affiliation(s)
- Nina Dupuis
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France
| | - Assia Fafouri
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France
| | - Aurélien Bayot
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France
| | - Manoj Kumar
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France
| | - Tifenn Lecharpentier
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France
| | - Gareth Ball
- Centre for the Developing Brain, Department of Division of Imaging Sciences and Biomedical Engineering, King's College London, King's Health Partners, St. Thomas' Hospital, London, UK
| | - David Edwards
- Centre for the Developing Brain, Department of Division of Imaging Sciences and Biomedical Engineering, King's College London, King's Health Partners, St. Thomas' Hospital, London, UK
| | - Véronique Bernard
- CNRS UMR7224, Inserm, U952, Paris, France, Univ Pierre et Marie Curie, Paris, France
| | - Pascal Dournaud
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France
| | - Séverine Drunat
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France, Service de Génétique Clinique, AP-HP, Hôpital Robert Debré, Paris, France
| | | | - Catheline Vilain
- Medical Genetics Department, Hôpital Erasme, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Marc Abramowicz
- Medical Genetics Department, Hôpital Erasme, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Julie Désir
- Medical Genetics Department, Hôpital Erasme, Université Libre de Bruxelles (ULB), Brussels, Belgium, Institut de Pathologie et de Génétique, Gosselies, Belgium
| | - Jacky Bonaventure
- CNRS UMR3347, Orsay, France, Institut Curie, Centre de Recherche, Paris, France
| | - Nelly Gareil
- CNRS UMR144, Paris, France and Institut Curie, Centre de Recherche, Paris, France
| | - Gaelle Boncompain
- CNRS UMR144, Paris, France and Institut Curie, Centre de Recherche, Paris, France
| | - Zsolt Csaba
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France
| | - Franck Perez
- CNRS UMR144, Paris, France and Institut Curie, Centre de Recherche, Paris, France
| | - Sandrine Passemard
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France, Service de Génétique Clinique, AP-HP, Hôpital Robert Debré, Paris, France
| | - Pierre Gressens
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France, Centre for the Developing Brain, Department of Division of Imaging Sciences and Biomedical Engineering, King's College London, King's Health Partners, St. Thomas' Hospital, London, UK
| | - Vincent El Ghouzzi
- Inserm, U1141, Paris, France, Sorbonne Paris Cité, Univ Paris Diderot, UMRS 1141, Paris, France,
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Dupuis N, Lebon S, Kumar M, Drunat S, Graul-Neumann LM, Gressens P, El Ghouzzi V. A novel RAB33B mutation in Smith-McCort dysplasia. Hum Mutat 2012; 34:283-6. [PMID: 23042644 DOI: 10.1002/humu.22235] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Accepted: 09/27/2012] [Indexed: 11/10/2022]
Abstract
Smith-McCort dysplasia (SMC) is a rare autosomal recessive spondylo-epi-metaphyseal dysplasia with skeletal features identical to those of Dyggve-Melchior-Clausen syndrome (DMC) but with normal intelligence and no microcephaly. Although both syndromes were shown to result from mutations in the DYM gene, which encodes the Golgi protein DYMECLIN, a few SMC patients remained negative in DYM mutation screening. Recently, autozygosity mapping and exome sequencing in a large SMC family have allowed the identification of a missense mutation in RAB33B, another Golgi protein involved in retrograde transport of Golgi vesicles. Here, we report a novel RAB33B mutation in a second SMC case that leads to a marked reduction of the protein as shown by Western blot and immunofluorescence. These data confirm the genetic heterogeneity of SMC dysplasia and highlight the role of Golgi transport in the pathogenesis of SMC and DMC syndromes.
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10
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Yazaki S, Koga M, Ishiguro H, Inada T, Ujike H, Itokawa M, Otowa T, Watanabe Y, Someya T, Iwata N, Kunugi H, Ozaki N, Arinami T. An association study between the dymeclin gene and schizophrenia in the Japanese population. J Hum Genet 2010; 55:631-4. [PMID: 20555340 DOI: 10.1038/jhg.2010.72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Many gene variants are involved in the susceptibility to schizophrenia and some of them are expected to be associated with other human characters. Recently reported meta-analysis of genetic associations revealed nucleotide variants in synaptic vesicular transport/Golgi apparatus genes with schizophrenia. In this study, we selected the dymeclin gene (DYM) as a candidate gene for schizophrenia. The DYM gene encodes dymeclin that has been identified to be associated with the Golgi apparatus and with transitional vesicles of the reticulum-Golgi interface. A three-step case-control study of total of 2105 Japanese cases of schizophrenia and 2087 Japanese control subjects was carried out for tag single-nucleotide polymorphisms (SNPs) in the DYM gene and an association between an SNP, rs833497, and schizophrenia was identified (allelic P=2 × 10(-5), in the total sample). DYM is the causal gene for Dyggve-Melchior-Clausen syndrome and this study shows the second neuropsychiatric disorder in which the DYM gene is involved. The present data support the involvement of Golgi function and vesicular transport in the presynapse in schizophrenia.
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Affiliation(s)
- Saori Yazaki
- Department of Medical Genetics, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
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