Satoshi Hayano1, Yusuke Okuno2, Makiko Tsutsumi3, Hidehito Inagaki4, Yoshie Fukasawa5, Hiroki Kurahashi6, Seiji Kojima7, Yoshiyuki Takahashi8, Taichi Kato9. 1. Department of Pediatrics, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan. Electronic address: javauma@gmail.com. 2. Center for Advanced Medicine and Clinical Research, Nagoya University Hospital, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan. Electronic address: yusukeokuno@gmail.com. 3. Division of Molecular Genetics, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Japan. Electronic address: makiko@fujita-hu.ac.jp. 4. Division of Molecular Genetics, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Japan. Electronic address: hinagaki@fujita-hu.ac.jp. 5. Department of Pediatrics, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan. Electronic address: love.rodin.love@gmail.com. 6. Division of Molecular Genetics, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Japan. Electronic address: kura@fujita-hu.ac.jp. 7. Department of Pediatrics, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan. Electronic address: kojimas@med.nagoya-u.ac.jp. 8. Department of Pediatrics, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan. Electronic address: ytakaha@med.nagoya-u.ac.jp. 9. Department of Pediatrics, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan. Electronic address: ktaichi@med.nagoya-u.ac.jp.
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.
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 SVASpatients. 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 SVASpatients 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: Adrien Morel; Dora Janeth Fonseca-Mendoza; Camilo Andres Velandia-Piedrahita; Victor Manuel Huertas-Quiñones; David Castillo; Juan Diego Bonilla; Camilo José Hernandez-Toro; Marta Catalina Miranda-Fernández; Carlos Martin Restrepo; Rodrigo Cabrera Journal: Appl Clin Genet Date: 2020-12-17
Authors: Veronique Saey; Annelies Decloedt; Mario Van Poucke; Luc Peelman; Gunther van Loon; Katrien Vanderperren; Richard Ducatelle; Koen Chiers Journal: J Vet Intern Med Date: 2020-09-14 Impact factor: 3.333