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Spondyloepimetaphyseal dysplasia with elevated plasma lysosomal enzymes caused by homozygous variant in MBTPS1

Carvalho, Daniel R., Speck‐Martins, Carlos E., Brum, Jaime M., Ferreira, Carlos R., Sobreira, Nara L. M.·2020·American Journal of Medical Genetics Part A

Abstract

Variants in MBTPS1 (membrane‐bound transcription factor peptidase, site 1) encoding the protein convertase site‐1 protease (S1P) were recently reported in a single individual with skeletal dysplasia and elevated plasma lysosomal enzymes. Here, we report the second individual with this newly described autosomal recessive spondyloepiphyseal dysplasia (OMIM #618392), presenting severe growth retardation, cataract and dysmorphic features, mainly retromicrognathia. Epilepsy and craniosynostosis were novel findings in our proband. She was found to be homozygous for a novel nonsense variant p.Trp983Ter in MBTPS1. In addition, she had normal levels of lysosomal enzyme activity in leukocytes but elevated levels in plasma. Our description confirms the existence of this new skeletal dysplasia and expands the phenotype and genotype of the disease.

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Metadata

Authors
Carvalho, D. R., Speck‐Martins, C. E., Brum, J. M., Ferreira, C. R., & Sobreira, N. L. M.
Affiliations
  • SARAH Network of Rehabilitation Hospitals Brasilia Brazil
  • Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health Bethesda Maryland USA
  • McKusick‐Nathans Department of Genetic Medicine Johns Hopkins School of Medicine Baltimore Maryland USA
Venue
American Journal of Medical Genetics Part A
Publisher
Wiley
Published
2020-05-18
Volume
182
Issue
7
Pages
1796-1800
ISSN
  • 1552-4825
  • 1552-4833
Cited by
21
References
1
Language
en
Funders
National Human Genome Research Institute (UM1 HG006542)

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