JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Susceptibility Risk Alleles of -238G/A, -308G/A and -1031T/C Promoter Polymorphisms of TNF-α Gene to Uterine Leiomyomas.

BACKGROUND: Uterine Leiomyomas (UL) are non-cancerous single celled mass of uterine smooth muscles distinguished by presence of large amounts of collagen, fibronectin and proteoglycans. Tumor necrosis factor-α (TNF-α), an inflammation inducing cytokine, plays a major role in various disorders of the immune system; is involved in tumor development and progression. It is proposed to study the influence of three functional promoter polymorphisms of TNF-α viz -238G/A, -308G/A and -1031T/C in the development and progression of UL.

METHODOLOGY: Study included 146 individuals positive for uterine fibroids and 150 healthy individuals. Genomic DNA was isolated from white blood corpuscles and subjected to PCR-RFLP analysis and Allele Specific PCR (ARMS). The significance of the obtained data in controls and patients was estimated and computed by adopting appropriate statistical tools.

RESULTS: In this study an association between TNF-α -1031T/C polymorphism and UL was reported. A significant association of the TC genotype (χ(2) - 14.34; p=0.0008) and the C allele (χ(2) - 5.898 p=0.015) with uterine leiomyomas was observed. Likewise odds risk estimates of 2.56 (95% CI 1.56-4.20, p=0.0007) revealed a significant association of TC genotype and C allele with uterine leiomyomas.

CONCLUSIONS: "TC" genotype and "C" allele of rs1799964 (-1031T/C) is associated with higher risks to leiomyomas. The "C" allele of -1031T/C results in an increased expression TNF-α leading to smooth cell proliferation and tumor progression, hence, may be a relevant molecular marker in the identification and establishment of UL.

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