Spondyloperipheral dysplasia as the mosaic form of platyspondylic lethal skeletal dyplasia torrance type in mother and fetus with the same COL2A1 mutation

Medical Genetics Department, Hôpital Erasme-ULB, Brussels, Belgium.
American Journal of Medical Genetics Part A (Impact Factor: 2.16). 08/2012; 158A(8):1948-52. DOI: 10.1002/ajmg.a.35301
Source: PubMed


We describe a fetus with platyspondylic lethal skeletal dysplasia, Torrance type (PLSD-T), a rare skeletal dysplasia characterized by platyspondyly, extremely short limbs, and mild brachydactyly. Mutation analysis of COL2A1 identified a novel in-frame deletion c.4458_4460delCTT (p.Phe1486del) in the C-propeptide region of the molecule, confirming the clinical diagnosis. The phenotype in the mother was compatible with mild spondyloperipheral dysplasia (SPPD). Molecular studies documented somatic mosaicism for the same mutation in the mother. This observation further highlights the causal relationship between PLSD-T and SPPD and emphasizes the importance of evaluating parents when confronted with a skeletal dysplasia in a prenatal setting.

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    ABSTRACT: Spondyloperipheral dysplasia (SPD; OMIM 271700) is an autosomal dominant connective tissue disorder characterized by vertebral body abnormalities (platyspondyly, end-plate indentations), hip dysplasia and brachydactyly type E. Here, we identified a novel truncating mutation (p.Lys1444AsnfsX27) in the C-propeptide of type II collagen in an affected Chinese individual with SPD. Our findings will provide clues to the phenotype-genotype relations and may assist not only in the clinical diagnosis of SPD but also in the interpretation of genetic information used for prenatal diagnosis and genetic counseling.
    No preview · Article · Mar 2013 · Gene
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    ABSTRACT: Spondyloepiphyseal dysplasia congenita (SEDC) is an autosomal dominant chondrodysplasia characterized by disproportionate short-trunk dwarfism, skeletal and vertebral deformities. Exome sequencing and Sanger sequencing were performed in a Chinese Han family with typical SEDC, and a novel mutation, c.620G>A (p.Gly207Glu), in the collagen type II alpha-1 gene (COL2A1) was identified. The mutation may impair protein stability, and lead to dysfunction of type II collagen. Family-based study suggested that the mutation is a de novo mutation. Our study extends the mutation spectrum of SEDC and confirms genotype-phenotype relationship between mutations at glycine in the triple helix of the alpha-1(II) chains of the COL2A1 and clinical findings of SEDC, which may be helpful in the genetic counseling of patients with SEDC.
    Full-text · Article · Jun 2015 · PLoS ONE
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    ABSTRACT: Mutations in the COL2A1 gene cause a spectrum of rare autosomal dominant conditions characterized by skeletal dysplasia, short stature, and sensorial defects. An early diagnosis is critical to providing relevant patient care and follow-up, and genetic counseling to affected families. There are no recent exhaustive descriptions of the causal mutations in the literature. Here, we provide a review of COL2A1 mutations extracted from the Leiden Open Variation Database (LOVD) that we updated with data from PubMed and our own patients. Over 700 patients were recorded, harboring 415 different mutations. One-third of the mutations are dominant negative mutations that affect the glycine residue in the G-X-Y repeats of the alpha 1 chain. These mutations disrupt the collagen triple helix and are common in achondrogenesis type II and hypochondrogenesis. The mutations resulting in a premature stop codon are found in less severe phenotypes such as Stickler syndrome. The p.(Arg275Cys) substitution is found in all patients with COL2A1-associated Czech dysplasia. LOVD-COL2A1 provides support and potential collaborative material for scientific and clinical projects aimed at elucidating phenotype genotype correlation and differential diagnosis in patients with type II collagenopathies. This article is protected by copyright. All rights reserved.
    No preview · Article · Oct 2015 · Human Mutation