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. 1991 Mar;48(3):511–517.

Characterization of a large deletion associated with a polymorphic block of repeated dinucleotides in the type III procollagen gene (COL3A1) of a patient with Ehlers-Danlos syndrome type IV.

B Lee 1, M D'Alessio 1, H Vissing 1, F Ramirez 1, B Steinmann 1, A Superti-Furga 1
PMCID: PMC1682995  PMID: 1998337

Abstract

Ehlers-Danlos syndrome type IV (EDS IV) is an autosomal dominant condition characterized by extreme fragility of skin, blood vessels, intestine, gravid uterus, and lungs. The phenotype is accounted for by mutations affecting the integrity and/or synthesis of the precursor procollagen molecules of type III collagen. In this article, we report the elucidation of the molecular defect in an EDS IV patient whose type III collagen was previously found to be structurally abnormal. We utilized PCR in a two-step process involving first the localization of the mutation in the mRNA and then the characterization of the defect in the gene. The results established the patient's heterozygosity for a genomic deletion of about 7.5 kb which eliminates 1,026 nucleotides of coding sequences in the message. The mutation arose as a result of an exon-to-intron recombination. The deleted segment extends from the 13th nucleotide of exon 9 to within a DNA sequence of intron 24, which is composed of a series of dinucleotide repeats. Using PCR, we tested the polymorphic nature of this DNA element on several unrelated individuals. Analysis of amplified genomic products of 45 chromosomes recognized at least four distinct allelic forms that display frequencies ranging from 5% to 61%. Mendelian segregation of three of the four alleles was established by the same method in a 3-generation family.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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