A systematic variant screening in familial cases of congenital heart defects demonstrates the usefulness of molecular genetics in this field.
Fiche publication
Date publication
février 2016
Journal
European journal of human genetics : EJHG
Auteurs
Membres identifiés du Cancéropôle Est :
Pr THAUVIN-ROBINET Christel
Tous les auteurs :
El Malti R, Liu H, Doray B, Thauvin C, Maltret A, Dauphin C, Gonçalves-Rocha M, Teboul M, Blanchet P, Roume J, Gronier C, Ducreux C, Veyrier M, Marçon F, Acar P, Lusson JR, Levy M, Beyler C, Vigneron J, Cordier-Alex MP, Heitz F, Sanlaville D, Bonnet D, Bouvagnet P
Lien Pubmed
Résumé
The etiology of congenital heart defect (CHD) combines environmental and genetic factors. So far, there were studies reporting on the screening of a single gene on unselected CHD or on familial cases selected for specific CHD types. Our goal was to systematically screen a proband of familial cases of CHD on a set of genetic tests to evaluate the prevalence of disease-causing variant identification. A systematic screening of GATA4, NKX2-5, ZIC3 and Multiplex ligation-dependent probe amplification (MLPA) P311 Kit was setup on the proband of 154 families with at least two cases of non-syndromic CHD. Additionally, ELN screening was performed on families with supravalvular arterial stenosis. Twenty-two variants were found, but segregation analysis confirmed unambiguously the causality of 16 variants: GATA4 (1 ×), NKX2-5 (6 ×), ZIC3 (3 ×), MLPA (2 ×) and ELN (4 ×). Therefore, this approach was able to identify the causal variant in 10.4% of familial CHD cases. This study demonstrated the existence of a de novo variant even in familial CHD cases and the impact of CHD variants on adult cardiac condition even in the absence of CHD. This study showed that the systematic screening of genetic factors is useful in familial CHD cases with up to 10.4% elucidated cases. When successful, it drastically improved genetic counseling by discovering unaffected variant carriers who are at risk of transmitting their variant and are also exposed to develop cardiac complications during adulthood thus prompting long-term cardiac follow-up. This study provides an important baseline at dawning of the next-generation sequencing era.
Mots clés
Female, GATA4 Transcription Factor, genetics, Genetic Testing, Genetic Variation, Heart Defects, Congenital, diagnosis, High-Throughput Nucleotide Sequencing, Homeobox Protein Nkx-2.5, Homeodomain Proteins, genetics, Humans, Male, Multiplex Polymerase Chain Reaction, Mutation, Pedigree, Transcription Factors, genetics
Référence
Eur J Hum Genet. 2016 02;24(2):228-36