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Biallelic TMEM251 variants in patients with severe skeletal dysplasia and extreme short stature
School of Biological Sciences, University of the Punjab, Lahore, Pakistan; Department of Molecular Medicine and Surgery and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.
School of Biological Sciences, University of the Punjab, Lahore, Pakistan.
Department of Medical Genetics, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran; Stem Cell Technology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
Division of pediatric endocrinology and Center for Molecular Medicine, Department of Women's and Children's Health, Karolinska Institutet and University Hospital, Stockholm, Sweden.
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2020 (English)In: Human Mutation, ISSN 1059-7794, E-ISSN 1098-1004, Vol. 42, no 1, p. 89-101Article in journal (Refereed) Published
Abstract [en]

Skeletal dysplasias are a heterogeneous group of disorders ranging from mild to lethal skeletal defects. We investigated two unrelated families with individuals presenting with a severe skeletal disorder. In family NMD02, affected individuals had a dysostosis multiplex-like skeletal dysplasia and severe short stature (<-8.5 SD). They manifested increasingly coarse facial features, protruding abdomens, and progressive skeletal changes, reminiscent of mucopolysaccharidosis. The patients gradually lost mobility and the two oldest affected individuals died in their twenties. The affected child in family ID01 had coarse facial features and severe skeletal dysplasia with clinical features similar to mucopolysaccharidosis. She had short stature, craniosynostosis, kyphoscoliosis, and hip-joint subluxation. She died at the age of 5 years. Whole-exome sequencing identified two homozygous variants c.133C>T; p.(Arg45Trp) and c.215dupA; p.(Tyr72Ter), respectively, in the two families, affecting an evolutionary conserved gene TMEM251 (NM_001098621.1). Immunofluorescence and confocal studies using human osteosarcoma cells indicated that TMEM251 is localized to the Golgi complex. However, p.Arg45Trp mutant TMEM251 protein was targeted less efficiently and the localization was punctate. Tmem251 knockdown by small interfering RNA induced dedifferentiation of rat primary chondrocytes. Our work implicates TMEM251 in the pathogenesis of a novel disorder and suggests its potential function in chondrocyte differentiation.

Place, publisher, year, edition, pages
John Wiley & Sons, 2020. Vol. 42, no 1, p. 89-101
Keywords [en]
Facial dysmorphology, Golgi, Iran, Pakistan, mucolipidosis, mucopolysaccharidosis
National Category
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
Identifiers
URN: urn:nbn:se:oru:diva-87753DOI: 10.1002/humu.24139ISI: 000594056600001PubMedID: 33252156Scopus ID: 2-s2.0-85096863382OAI: oai:DiVA.org:oru-87753DiVA, id: diva2:1506347
Funder
Academy of FinlandForte, Swedish Research Council for Health, Working Life and Welfare
Note

Funding Agencies:

National Institute for Medical Research Development 940714

Higher Eductation Comission Pakistan  

Koshish Foundation, USA  

Sigrid Juselius Foundation

Available from: 2020-12-03 Created: 2020-12-03 Last updated: 2021-01-14Bibliographically approved

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Nilsson, Ola

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