title: Gene polymorphisms in RANKL/RANK/OPG pathway are associated with ages at menarche and natural menopause in Chinese women.
abstract: BACKGROUND
  Age at menarche (AAM) and age at natural menopause (AANM) have been shown intimately associated with woman's health later in life. Previous studies have indicated that AAM and AANM are highly heritable. RANKL/RANK/OPG signaling pathway is essential for mammary gland development, which is also found associated with post-menopausal and hormone-related diseases. The aim of this study was to evaluate associations between the polymorphisms in the TNFSF11, TNFRSF11A and TNFRSF11B genes in the RANKL/RANK/OPG pathway with AAM and AANM in Chinese women.
  
  
  METHODS
  Post-menopausal Chinese women (n = 845) aged from 42 to 89 years were recruited in the study. Information about AAM and AANM were obtained through questionnaires and the genomic DNA was isolated from peripheral blood from the participants. Total 21 tagging single nucleotide polymorphisms (SNPs) of TNFSF11, TNFRSF11A and TNFRSF11B were genotyped.
  
  
  RESULTS
  Three SNPs of TNFRSF11A (rs4500848, rs6567270 and rs1805034) showed significant association with AAM (P < 0.01, P = 0.02 and P = 0.01, respectively), and one SNP (rs9962159) was significantly associated with AANM (P = 0.03). Haplotypes TC and AT (rs6567270-rs1805034) of TNFRSF11A were found to be significantly associated with AAM (P = 0.01 and P = 0.02, respectively), and haplotypes GC and AC (rs9962159-rs4603673) of TNFRSF11A showed significant association with AANM (P = 0.03 and P < 0.01, respectively). No significant association between TNFSF11 or TNFRSF11B gene with AAM or AANM was found.
  
  
  CONCLUSIONS
  The present study suggests that TNFRSF11A but not TNFSF11 and TNFRSF11B genetic polymorphisms are associated with AAM and AANM in Chinese women. The findings provide evidence that genetic variations in RANKL/RANK/OPG pathway may be associated with the onset and cessation of the menstruation cycle.
authors.affiliation: Department of Endocrinology and Metabolism, Nanchang Key Laboratory of Diabetes, The Third Hospital of Nanchang/The Affiliated Nanchang Hospital of Southern Medical University, NO.2, South Xiangshan road, Nanchang city, Xihu District, Jiangxi province, 330009, People's Republic of China. 13479111177@163.com.
authors.forename: Peng
authors.initials: P
authors.lastname: Duan
authors.affiliation: Department of Endocrinology and Metabolism, Nanchang Key Laboratory of Diabetes, The Third Hospital of Nanchang/The Affiliated Nanchang Hospital of Southern Medical University, NO.2, South Xiangshan road, Nanchang city, Xihu District, Jiangxi province, 330009, People's Republic of China. 314677548@qq.com.
authors.forename: Zhi-Ming
authors.initials: ZM
authors.lastname: Wang
authors.affiliation: Department of Endocrinology and Metabolism, Nanchang Key Laboratory of Diabetes, The Third Hospital of Nanchang/The Affiliated Nanchang Hospital of Southern Medical University, NO.2, South Xiangshan road, Nanchang city, Xihu District, Jiangxi province, 330009, People's Republic of China. 64824815@qq.com.
authors.forename: Jiang
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Endocrinology and Metabolism, Nanchang Key Laboratory of Diabetes, The Third Hospital of Nanchang/The Affiliated Nanchang Hospital of Southern Medical University, NO.2, South Xiangshan road, Nanchang city, Xihu District, Jiangxi province, 330009, People's Republic of China. 498377843@qq.com.
authors.forename: Li-Na
authors.initials: LN
authors.lastname: Wang
authors.affiliation: Department of Endocrinology and Metabolism, Nanchang Key Laboratory of Diabetes, The Third Hospital of Nanchang/The Affiliated Nanchang Hospital of Southern Medical University, NO.2, South Xiangshan road, Nanchang city, Xihu District, Jiangxi province, 330009, People's Republic of China. 84991794@qq.com.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Department of Endocrinology and Metabolism, Nanchang Key Laboratory of Diabetes, The Third Hospital of Nanchang/The Affiliated Nanchang Hospital of Southern Medical University, NO.2, South Xiangshan road, Nanchang city, Xihu District, Jiangxi province, 330009, People's Republic of China. tuping8877@126.com.
authors.forename: Ping
authors.initials: P
authors.lastname: Tu
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000235:genetics; D002681:China; D005260:Female; D006801:Humans; D008572:Menarche / Q000208:ethnology / Q000235:genetics; D008593:Menopause / Q000208:ethnology / Q000235:genetics; D008875:Middle Aged; D053244:Osteoprotegerin / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D053245:RANK Ligand / Q000235:genetics*; D053246:Receptor Activator of Nuclear Factor-kappa B / Q000235:genetics*; D016387:Women's Health / Q000208:ethnology
chemical_list: D053244:Osteoprotegerin; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; C505686:TNFRSF11A protein, human; C506030:TNFRSF11B protein, human; C505688:TNFSF11 protein, human