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Spectrum of elastin sequence variants and cardiovascular phenotypes in 49 patients with Williams-Beuren syndrome.

American journal of medical genetics. Part A (2013-02-13)
Maria Delio, Kathleen Pope, Tao Wang, Joy Samanich, Chad R Haldeman-Englert, Paige Kaplan, Tamim H Shaikh, Jinlu Cai, Robert W Marion, Bernice E Morrow, Melanie Babcock
ABSTRACT

Haploinsufficiency of the elastin gene (ELN) on 7q11.23 is responsible for supravalvular aortic stenosis (SVAS) and other arteriopathies in patients with Williams-Beuren syndrome (WBS). These defects occur with variable penetrance and expressivity, but the basis of this is unknown. To determine whether DNA variations in ELN could serve as genetic modifiers, we sequenced the 33 exons and immediately surrounding sequence of the ELN gene (9,455 bp of sequence) in 49 DNAs from patients with WBS and compared cardiovascular phenotypes. Four missense, and four novel intronic variants were identified from a total of 24 mostly intronic single nucleotide variations and one indel. Two missense changes were present in one patient each, one published, p.Gly610Ser in exon 27 (MAF, 0.003) and one novel, p.Cys714Tyr, in exon 33 (MAF, 0.001), were rare in the general population. To identify a statistical association between the variants identified here and cardiovascular phenotypes a larger cohort would be needed.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Elastin from bovine neck ligament, powder
Sigma-Aldrich
Elastin, soluble from bovine neck ligament, salt-free, lyophilized powder
Sigma-Aldrich
Elastin from human skin, insoluble powder
Sigma-Aldrich
Elastin, soluble from human aorta, lyophilized powder
Sigma-Aldrich
Elastin from mouse lung, powder
Sigma-Aldrich
Elastin, soluble from human lung, lyophilized powder