The Prevalence of Polymorphic Variants of ABCB1 Gene among Indigenous Populations of Siberia

We compared the frequencies of genotypes and alleles of the C3435T and C1236T polymorphisms of the multidrug resistance gene (ABCB1) among adolescents of the indigenous populations of North Asia: Tofalars, Evenks, Soyots. The sample included 86 people (Tofalars-26 people, Evenks-38, Soyots-22). The average age was 14 [12.5-15.5] years for Soyots, 13 [11-15] years for Evenks, and 12 [11.5-15] years for Tofalars. We used real-time polymerase chain reaction (RT-PCR) to identify ABCB1 genotypes. CC genotype C3435T and CC genotype C1236T of the ABCB1 gene could be the cause of drug resistance. The frequency of CC genotype C3435T was 31.82, 18.42, and 15.38% in Soyots, Evenks, and Tofalars, respectively. The frequency of the C allele C3435T of the ABCB1 gene in Soyots, Evenks, and Tofalars was 0.59, 0.46, and 0.52, respectively. The frequency of CC genotype C1236T of the ABCB1 gene was 22.73, 18.42, and 7.69% in Soyots, Evenks, and Tofalars, respectively. The frequency of the C allele of the C1236T polymorphism of the ABCB1 gene was 0.55, 0.58, and 0.54 in Soyots, Evenks, and Tofalars, respectively. Identifying gene variants is important for predicting drug susceptibility. We revealed the similarity of the frequencies of genotypes and alleles of the C3435T and C1236T ABCB1 gene in the indigenous peoples of North Asia to other populations around the world. This allows the use of clinical guidelines for drugs transported by the P-gp system.