Hum. Reprod. Advance Access originally published online on June 22, 2007
Human Reproduction 2007 22(8):2142-2152; doi:10.1093/humrep/dem148
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Examination of reproductive aging milestones among women who carry the FMR1 premutation
1 Department of Human Genetics, Emory University 2 Department of Epidemiology, Rollins School of Public Health, Emory University 3 Department of Gynecology and Obstetrics, School of Medicine, Emory University
4 Correspondence address. 615 Michael Street, Suite 301, Atlanta, GA 30322, USA. Tel: +1-404-778-8473; Fax: +1-404-727-3949; E-mail: egraves{at}genetics.emory.edu
BACKGROUND: The fragile X premutation is characterized by a large CGG repeat track (55–199 repeats) in the 5' UTR of the FMR1 gene. This X-linked mutation leads to an increased risk for premature ovarian failure; interestingly, the association of repeat size with risk is non-linear. We hypothesize that the premutation-associated ovarian insufficiency is due to a diminished oocyte pool and examined reproductive aging milestones by repeat size group to determine if the same non-linear association is observed.
METHODS: We analyzed cross-sectional reproductive history questionnaire data from 948 women with a wide range of repeat sizes.
RESULTS: We have confirmed the non-linear relationship among premutation carriers for ovarian insufficiency. The mid-range repeat size group (80–100 repeats), not the highest group, had an increased risk for: altered cycle traits (shortened cycle length, irregular cycles and skipped cycles), subfertility and dizygotic twinning. Smoking, a modifiable risk, decreased the reproductive lifespan of women with the premutation by about 1 year, similar to its effect on non-carriers. As expected, premutation carriers were found to be at an increased risk for osteoporosis.
CONCLUSIONS: Possible molecular mechanisms to explain the non-linear repeat size risk for ovarian insufficiency are discussed.
Key words: FMRP/infertility/menopause/RNA toxic effect/trinucleotide
Submitted on December 18, 2006; resubmitted on May 1, 2007; accepted on May 8, 2007.
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