Positive correlation between Bax and Bcl-2 gene polymorphisms with the risk of endometriosis: A case-control study

Abstract

Background: Endometriosis is a chronic, gynecological disorder, and the disease’s pathogenesis is still debatable. Genes related to apoptosis have been revealed to be deregulated in endometriosis.


Objective: This study investigates the relationship between polymorphic variants of Bax -248G>A and Bcl-2 -938C>A promoter regions with endometriosis risk in an Iranian population.


Materials and Methods: In this case-control study, the polymorphisms of Bax -248G>A and Bcl-2 -938C>A promoter regions were analyzed in 127 Iranian cases and 125 controls who were referred to Ali-ibn-Abi Taleb Educational hospital, Zahedan, Iran between May 2022 and February 2023. The genotypic analysis was performed for all the subjects using the polymerase chain reaction-restriction fragment length polymorphism method.


Results: The frequencies of mutant allele A carriers and the A allele of Bax -248G>A polymorphism showed about 2-fold significant increase of endometriosis risk (p = 0.04; p = 0.01, respectively). The frequencies of the mutant genotype AA and A allele carriers of Bcl-2 -938C>A polymorphism were approximately 4 and 2.5-fold higher in endometriosis compared to the control women, which were highly significant (p > 0.001). Moreover, the allele A frequency of Bcl-2 -938C>A was associated with a 2-fold higher risk of endometriosis (p > 0.001). Furthermore, the combination effects of these 2 single nucleotide polymorphisms showed that women with Bax -248G>A GG and Bcl-2 -938C>A AA variant alleles were associated with about 5 times higher risk of endometriosis (p > 0.001). Notably, a significant difference was observed in mutant allele distribution between minimal/mild (stage I and II) and moderate/severe (stage III and IV) women with endometriosis disease.


Conclusion: The results of our study provide evidence that Bcl-2 -938C>A and Bax -248G>A single nucleotide polymorphisms might be associated with the risk of endometriosis.


Key words: Endometriosis, Apoptosis, Genetic polymorphism, Bax, Bcl-2.

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