Genetic of thoracic aorta aneurysm

The thoracic aortic aneurysm corresponds to the dilation of the ascending part of the aorta, which can lead to a dissection (TAAD for Thoracic Aortic Aneurysm and Dissection) or aortic rupture. The etiologies are diverse, but in approximately 20% of cases a genetic origin is found. About thirty genes are reported to be responsible for the development of TAAD. The majority of these genes encode for proteins involved in the extracellular matrix, the contraction of smooth muscle cells or the growth factor TGF-β signaling pathway. Identifying the pathogenic variant responsible for the aortic disease becomes essential to make a definitive diagnosis, to guide and to personalize the treatment of the patients but also to screen relatives at risk. The availability and access to genetic testing have improved considerably with the development of new sequencing techniques (NGS for Next Generation Sequencing) and the use of gene panels. This review summarizes the main genes associated with TAAD as well as the current diagnostic strategy.