0118 Association between TNF-α G308A Polymorphism (rs1800629) and Insomnia Vulnerability in Fertile Age Women with Primary Dysmenorrhea

Abstract

Abstract Introduction Higher tumor necrosis factor-alpha (TNF-α) gene expression has been revealed in the peripheral blood monocytes across the menstrual cycle in patients with primary dysmenorrhea (PDM) than in the unaffected control. Sleep quality is affected by environmental factors, endocrine function abnormalities and genetic factors. The aim of this study was to evaluate the effect of TNF-α G308A polymorphism (rs1800629) on the self-reported sleep, health, menstrual pain severity as well as peri-ovulatory serum TNF-α level in women with and without PDM. Methods Sleep, psychological and physiological characteristics and menstrual pain severity were collected with questionnaires and sleep/menstrual diary within a menstrual cycle from a cohort of 43 PDM women and 42 healthy controls (aged 20-30 years, right-handed, non-smoking and non-shift workers without psychiatric, sleep and neurological comorbidity). Chi-square tests were used to check if the genotype proportions of the investigated gene fitted the Hardy-Weinberg equilibrium (HWE) and to evaluate if the genotypic and allelic distribution is associated with PDM. Chi-square tests or analysis of variance were used to examine the effects of genotype, group and/or genotype x group interaction with the sleep, mind and the body health variables. Results Neither allele frequencies nor genotypes of TNF-α G-308A gene could serve as an independent risk factor of PDM in the Taiwanese population. Circulating serum TNF-α did not correspond with the -308 TNF-α promoter polymorphism, either, which might be due to a multifactorial control process. The TNF-α 308 A allele carriers (28.6%) which was less common than the G allele carriers (71.4%), showed lower Beck depression score, lower bodily pain and better physical health and higher subjective sleep quality. Furthermore, in G allele carriers, the PDM group showed higher insomnia severity and lower sleep duration than that of the control group. Conclusion Present results suggested that TNF-alpha polymorphism conferred no prediction to PDM risk and peri-ovulatory serum TNF-α level. However, our findings were evident that the A allele at the TNFα 308 locus, as compared to the more common G allele, was associated to better health and better sleep, with an indication of a genetic underpinning to their better resistance from the risk of PDM. Support (if any)