THE NEW GENETIC ASPECTS OF ATRIAL FIBRILLATION IN PERSONS OF THE RUSSIAN POPULATION
Atrial fibrillation (AF) is one of the most common and dangerous heart rhythm disorders. Lone AF is due to a genetic predisposition. Foreign studies have proven the association of rs2200733 polymorphism of chromosome 4q25 with AF. No such studies have been conducted in the Russian Federation. Purpose of the study: to determine the association of the rs2200733 polymorphism of chromosome 4q25 with the development of AF, and to exclude the possible connection of the studied polymorphic marker with concomitant cardiovascular pathology. A total of 247 patients with AF were examined (113 from lone AF, 134 from secondary). Control group - 182 healthy people. Behavior: ECG, EchoCG, Holter ECG monitoring, blood test for thyroid hormones, VEM, CAG, molecular genetic research. In the group of patients with AF, the TT genotype was detected in 12.95%, which is statistically significant more often than in the control group (4.94%), p<0.05. In the presence of a genotype with a rare T allele, the risk of developing AF increases by 1.5 times. The TT genotype was statistically significant more often in the subgroup of patients with isolated AF (17.70%) in comparison with the control group (4.94%), p<0.05. The risk of developing isolated AF in the presence of a genotype with a rare allele T is 1.8 times increased. Chronic heart failure, no statistically significant differences were found (p>0.05). In patients with the TT genotype, the mean LA size was 3.738 ± 0.494 cm, it was statistically significantly smaller than in patients with the CC genotype, which corresponded to 3.925 ± 0.629 cm, p<0.05; and than in individuals with a heterozygous CT genotype, its value in this subgroup is 4.018 ± 0.639 cm, p<0.05. Conclusions: Homozygous genotype for the rare TT allele and the T allele of the rs2200733 polymorphism of chromosome 4q25 are predictors of lone AF. The rs2200733 polymorphism has no association with any cardiovascular pathology, such as hypertension, ischemic heart disease and chronic heart failure. The TT genotype and the T allele of the rs2200733 polymorphism do not affect left atrial remodeling in patients with AF.