Fiche publication
Date publication
juillet 2019
Journal
European journal of human genetics : EJHG
Auteurs
Membres identifiés du Cancéropôle Est :
Dr ALBUISSON Juliette
Tous les auteurs :
Luyckx I, Kumar AA, Reyniers E, Dekeyser E, Vanderstraeten K, Vandeweyer G, Wünnemann F, Preuss C, Mazzella JM, Goudot G, Messas E, Albuisson J, Jeunemaitre X, Eriksson P, Mohamed SA, Kempers M, Salemink S, Duijnhouwer A, Andelfinger G, Dietz HC, Verstraeten A, Van Laer L, Loeys BL,
Lien Pubmed
Résumé
Bicuspid aortic valve (BAV) is the most common congenital heart defect (CHD), affecting 1-2% of the population. BAV is associated with thoracic aortic aneurysms (TAAs). Deleterious copy number variations (CNVs) were found previously in up to 10% of CHD cases. This study aimed at unravelling the contribution of deleterious deletions or duplications in 95 unrelated BAV/TAA patients. Seven unique or rare CNVs were validated, harbouring protein-coding genes with a role in the cardiovascular system. Based on the presence of overlapping CNVs in patients with cardiovascular phenotypes in the DECIPHER database, the identification of similar CNVs in whole-exome sequencing data of 67 BAV/TAA patients and suggested topological domain involvement from Hi-C data, supportive evidence was obtained for two genes (DGCR6 and TBX20) of the seven initially validated CNVs. A rare variant burden analysis using next-generation sequencing data from 637 BAV/TAA patients was performed for these two candidate genes. This revealed a suggestive genetic role for TBX20 in BAV/TAA aetiology, further reinforced by segregation of a rare TBX20 variant with the phenotype within a BAV/TAA family. To conclude, our results do not confirm a significant contribution for deleterious CNVs in BAV/TAA as only one potentially pathogenic CNV (1.05%) was identified. We cannot exclude the possibility that BAV/TAA is occasionally attributed to causal CNVs though, or that certain CNVs act as genetic risk factors by creating a sensitised background for BAV/TAA. Finally, accumulative evidence for TBX20 involvement in BAV/TAA aetiology underlines the importance of this transcription factor in cardiovascular disease.
Mots clés
Adult, Aortic Aneurysm, Thoracic, genetics, Aortic Valve, abnormalities, Bicuspid Aortic Valve Disease, DNA Copy Number Variations, Databases, Genetic, Female, Genome-Wide Association Study, Heart Defects, Congenital, genetics, Heart Valve Diseases, genetics, Humans, Male, Middle Aged, T-Box Domain Proteins, genetics
Référence
Eur J Hum Genet. 2019 07;27(7):1033-1043
