Association of polymorphism in the tumor necrotic factor-alpha (TNF-alpha) gene and interleukin-1beta (IL-1beta) gene with preterm delivery / 대한산부인과학회잡지

ABSTRACT

OBJECTIVE: To elucidate whether polymorphisms of tumor necrotic factor-alpha (TNF-alpha) and interleukin-1beta (IL-1beta) are associated with preterm delivery caused by preterm labor and preterm premature rupture of membrane (PPROM) in korean pregnant women. METHODS: From August 2002 to October 2003, we recruited 93 pregnant women who delivered before 37 weeks in gestation. In 93 cases, there were 66 cases with preterm labor and 27 cases with PPROM. 288 pregnant women who delivered after 37 weeks in gestation served as controls. Maternal blood was collected and Genomic DNA was extracted from peripheral blood and the relevant genomic region was amplified using polymerase chain reaction (PCR). PCR products were digested with the restriction enzymes, Nco I for TNF-alpha and Ava I for IL-1beta. Data was analyzed by 2-tailed unpaired t test, x2 test, odds ratio with 95% confidence interval using SPSS 10.0. RESULTS: In normal pregnant group, the proportions of TNF-alpha*1/ TNF-alpha*1, TNF-alpha*1/ TNF-alpha*2, and TNF-alpha*2/ TNF-alpha*2 were 91%, 8%, and 1%, respectively. In normal pregnant group, the proportions of IL-1beta*A/IL-1beta*A, IL-1beta*A/IL-1beta*a, and IL-1beta*a/IL-1beta*a were 29%, 40%, and 31%,respectively. The carrier rate of TNF-alpha*2 was significantly different in PPROM group compared with control group (22% vs. 9%, P=0.03), while not in preterm labor group (15% vs. 9%, P=0.138). The allelic frequency of TNF-alpha*2 was significantly different neither in preterm labor group nor in PPROM group compared with control group (0.08 vs. 0.05, P=0.248; 0.11 vs. 0.5, P=0.062, respectively). The carrier rate of IL-1beta*a was significantly different neither in preterm labor group nor in PPROM group compared with control group (68% vs. 71%, P=0.671; 67% vs. 71%, P=0.65, respectively). The allelic frequency of IL-1beta*a was significantly different neither in preterm labor group nor in PPROM group compared with control group (0.44 vs 0.52, P=0.151; 0.52 vs. 0.52, P=0.512, respectively). CONCLUSION: These results suggest that TNF-alpha polymorphism may be, at least in part, associated with PPROM.