A splice-junction mutation in the region of COL5A1 that codes for the carboxyl propeptide of pro alpha 1(V) chains results in the gravis form of the Ehlers-Danlos syndrome (type I).

Abstract:

:Type V collagen is a constituent of type I collagen-rich fibrils in many connective tissues and is a regulator of fibril diameter. In tissues, type V collagen is a heterotrimer with the molecular structure: alpha 1(V)2 alpha 2(V) or alpha 1(V) alpha 2(V) alpha 3(V). We report that genomic polymorphisms at the pro alpha 1(V) gene (COL5A1) locus cosegregated with the gravis form of Ehlers-Danlos syndrome (EDS) (type I) in a three generation family. Affected family members, who had classical features including joint hyperextensibility, fragile skin, and widened, atrophic scars, were heterozygous for a 4 bp deletion at positions from +3 to +6 of intron 65, which resulted in removal of exon 65 sequences from processed mRNAs. Since exon 65 encodes 78 residues of the carboxyl propeptide, the expected result of this mutation is reduced efficiency in incorporating mutant pro alpha 1(V) chains into type V collagen molecules and reduced type V collagen synthesis. These studies indicate that heterozygous mutations in COL5A1 can result in EDS type I. However, linkage studies in other EDS I families indicate the disorder is heterogeneous; linkage to both COL5A1 and COL5A2 was excluded in two other families with EDS I while a fourth family was concordant for linkage to COL5A1 (Z = 2.11; theta = 0.00).

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Wenstrup RJ,Langland GT,Willing MC,D'Souza VN,Cole WG

doi

10.1093/hmg/5.11.1733

subject

Has Abstract

pub_date

1996-11-01 00:00:00

pages

1733-6

issue

11

eissn

0964-6906

issn

1460-2083

pii

6w0158

journal_volume

5

pub_type

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