Frequent intragenic microdeletions of elastin in familial supravalvular aortic stenosis.

Abstract

BACKGROUND:

Supravalvular aortic stenosis (SVAS) is a congenital heart disease affecting approximately 1:25,000 live births. SVAS may occur sporadically, be inherited in an autosomal dominant manner, or be associated with Williams-Beuren syndrome, a complex developmental disorder caused by a microdeletion of chromosome 7q11.23. ELN on 7q11.23, which encodes elastin, is the only known gene to be recurrently mutated in less than half of SVAS patients.

METHODS:

Whole-exome sequencing (WES) was performed for seven familial SVAS families to identify other causative gene mutations of SVAS.

RESULTS:

Three truncating mutations and three intragenic deletions affecting ELN were identified, yielding a diagnostic efficiency of 6/7 (85%). The deletions, which explained 3/7 of the present cohort, spanned 1-29 exons, which might be missed in the course of mutational analysis targeting point mutations. The presence of such deletions was validated by both WES-based copy number estimation and multiplex ligation-dependent probe amplification analyses, and their pathogenicity was reinforced by co-segregation with clinical presentations.

CONCLUSIONS:

The majority of familial SVAS patients appear to carry ELN mutations, which strongly indicates that elastin is the most important causative gene for SVAS. The frequency of intragenic deletions highlights the need for quantitative tests to analyze ELN for efficient genetic diagnosis of SVAS.

• Authors: Satoshi Hayano, Yusuke Okuno, Makiko Tsutsumi, Hidehito Inagaki, Yoshie Fukasawa, Hiroki Kurahashi, Seiji Kojima, Yoshiyuki Takahashi, Taichi Kato
• Journal: International journal of cardiology (Int J Cardiol) Vol. 274 Pg. 290-295 (Jan 01 2019) ISSN: 1874-1754 [Electronic] Netherlands
• PMID: 30228022 (Publication Type: Journal Article)
• Copyright: Copyright © 2018 Elsevier B.V. All rights reserved.

Chemical References

• DNA
• Elastin

Topics

• Aortic Stenosis, Supravalvular (diagnosis, genetics, metabolism)
• DNA (genetics)
• DNA Mutational Analysis
• Elastin (genetics, metabolism)
• Female
• Humans
• Male
• Pedigree
• Point Mutation
• Exome Sequencing (methods)