Abstract
Aneurysms impacting the ascending thoracic aorta and the abdominal aorta affect patient
populations with distinct clinical characteristics. Through a literature review, this
paper compares the genetic associations of ascending thoracic aortic aneurysm (ATAA)
with abdominal aortic aneurysms (AAA). Genes related to atherosclerosis, lipid metabolism,
and tumor development are associated specifically with sporadic AAA, while genes controlling
extracellular matrix (ECM) structure, ECM remodeling, and tumor growth factor β function
are associated with both AAA and ATAA. Contractile element genes uniquely predispose
to ATAA. Aside from known syndromic connective tissue disease and poly-aneurysmal
syndromes (Marfan disease, Loeys–Dietz syndrome, and Ehlers–Danlos syndrome), there
is only limited genetic overlap between AAA and ATAA. The rapid advances in genotyping
and bioinformatics will elucidate further the various pathways associated with the
development of aneurysms affecting various parts of the aorta.
Keywords
abdominal aortic aneurysm - thoracic aortic aneurysm - genetics - mutation - polymorphism