Identification of Variants of Uncertain Significance in the Genes Associated with Thoracic Aortic Disease in Russian Patients with Nonsyndromic Sporadic Subtypes of the Disorder

Author:

Goncharova Irina A.1,Shipulina Sofia A.1ORCID,Sleptcov Aleksei A.1ORCID,Zarubin Aleksei A.1,Valiakhmetov Nail R.1ORCID,Panfilov Dmitry S.2ORCID,Lelik Evgeniya V.2ORCID,Saushkin Viktor V.2,Kozlov Boris N.2ORCID,Nazarenko Ludmila P.1,Nazarenko Maria S.1ORCID

Affiliation:

1. Research Institute of Medical Genetics, Tomsk National Research Medical Center, Russian Academy of Sciences, 10 Ushaika Str., Tomsk 634050, Russia

2. Cardiology Research Institute, Tomsk National Research Medical Center, Russian Academy of Sciences, 111a Kievskaya Str., Tomsk 634012, Russia

Abstract

Nonsyndromic sporadic thoracic aortic aneurysm (nssTAA) is characterized by diverse genetic variants that may vary in different populations. Our aim was to identify clinically relevant variants in genes implicated in hereditary aneurysms in Russian patients with nssTAA. Forty-one patients with nssTAA without dissection were analyzed. Using massive parallel sequencing, we searched for variants in exons of 53 known disease-causing genes. Patients were found to have no (likely) pathogenic variants in the genes of hereditary TAA. Six variants of uncertain significance (VUSs) were identified in four (9.8%) patients. Three VUSs [FBN1 c.7841C>T (p.Ala2614Val), COL3A1 c.2498A>T (p.Lys833Ile), and MYH11 c.4993C>T (p.Arg1665Cys)] are located in genes with “definitive” disease association (ClinGen). The remaining variants are in “potentially diagnostic” genes or genes with experimental evidence of disease association [NOTCH1 c.964G>A (p.Val322Met), COL4A5 c.953C>G (p.Pro318Arg), and PLOD3 c.833G>A (p.Gly278Asp)]. Russian patients with nssTAA without dissection examined in this study have ≥1 VUSs in six known genes of hereditary TAA (FBN1, COL3A1, MYH11, NOTCH1, COL4A5, or PLOD3). Experimental studies expanded genetic testing, and clinical examination of patients and first/second-degree relatives may shift VUSs to the pathogenic (benign) category or to a new class of rare “predisposing” low-penetrance variants causing the pathology if combined with other risk factors.

Funder

the Russian Science Foundation

Publisher

MDPI AG

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