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A Novel Splicing Mutation in the FBN2 Gene in a Family with Congenital Contractural Arachnodactyly

Xu, P.; Li, R.; Huang, S.; Sun, M.; Liu, J.; Niu, Y.; Zou, Y.; Li, J.; Gao, M.; Li, X.; Gao, X.; Gao, Y.

Frontiers in Genetics 11: 143

2020

ISSN/ISBN: 1664-8021
PMID: 32184806
DOI: 10.3389/fgene.2020.00143
Accession: 069926260
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Congenital contractural arachnodactyly (CCA) is an extremely rare monogenic disorder in humans, and the prevalence of CCA is estimated to be less than 1 in 10,000 worldwide. CCA is characterized by arachnodactyly, camptodactyly, the contracture of major joints, scoliosis, pectus deformities, and crumpled ears. Mutations in FBN2 (which encodes fibrillin-2) are responsible for causing this disease. A family with CCA was investigated in this study, and a novel variant, c.3724+3A > C (also identified as IVS28+3A > C), in FBN2 was found in nine patients from the family but was not found in seven unaffected relatives. Reverse transcription-PCR (RT-PCR) and complementary DNA (cDNA) sequencing data showed that exon 28 was skipped in the FBN2 gene. The FBN2 c.3724+3A > C variant led to an in-frame deletion during transcription, which eventually triggered CCA in the Chinese family.

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