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Author Notes:

Correspondence: Emily G. Allen; emgrave@emory.edu

Author Contributions: EA performed the data analysis and manuscript preparation.

AG, NT, WH, AA, and SN performed the lab work.

KC, LS, and HH participated in subject recruitment.

AG, KC, HH, SN, and SS contributed to manuscript preparation.

Acknowledgments: We would like to thank the volunteers and their families whose participation made the work possible.

Disclosures: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Subjects:

Research Funding:

This work was supported by an award (Grant No. NIH U54NS09185) from the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) and the National Institute of Neurological Disorders and Stroke (NINDS).

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Genetics & Heredity
  • FXPOI
  • POF
  • FMR1
  • Fragile X
  • premutation
  • menopause
  • infertility
  • FRAGILE-X-SYNDROME
  • PRIMARY OVARIAN INSUFFICIENCY
  • FMR1 MESSENGER-RNA
  • TREMOR ATAXIA SYNDROME
  • CGG REPEAT NUMBER
  • TREMOR/ATAXIA SYNDROME
  • CARRIERS
  • TRANSLATION
  • FEATURES
  • RISK

FXPOI: Pattern of AGG Interruptions Does not Show an Association With Age at Amenorrhea Among Women With a Premutation

Tools:

Journal Title:

Frontiers in Genetics

Volume:

Volume 9, Number AUG

Publisher:

, Pages 292-292

Type of Work:

Article | Final Publisher PDF

Abstract:

Fragile X-associated primary ovarian insufficiency (FXPOI) occurs in about 20% of women who carry a premutation allele (55-200 CGG repeats). These women develop hypergonadotropic hypogonadism and have secondary amenorrhea before age 40. A non-linear association with repeat size and risk for FXPOI has been seen in multiple studies women with a premutation: those with a mid-range of repeats are at highest risk (~70-100 CGG repeats). Importantly, not all carriers with 70-100 repeats experience FXPOI. We investigated whether AGG interruptions, adjusted for repeat size, impacted age at secondary amenorrhea. We have reproductive history information and AGG interruption data on 262 premutation women: 164 had an established age at amenorrhea (AAA) (for some, age at onset of FXPOI) or menopause, 16 had a surgery involving the reproductive system such as a hysterectomy, and 82 women were still cycling at the last interview. Reproductive status was determined using self-report reproductive questionnaires and interviews with a reproductive endocrinologist. For each of these 262 women, FMR1 repeat size and number of AGG interruptions were determined. We confirmed the association of repeat size with AAA or menopause among women with a premutation. As expected, both premutation repeat size and the quadratic form of repeat size (i.e., squared term) were significant in a survival analysis model predicting AAA (p < 0.0001 for both variables). When number of AGG interruptions was added to the model, this variable was not significant (p = 0.59). Finally, we used a regression model based on the 164 women with established AAA to estimate the proportion of variance in AAA explained by repeat size and its squared term. Both terms were again highly significant (p < 0.0001 for both), but together only explained 13% of the variation in AAA. The non-linear association between AAA and FMR1 repeat size has been described in several studies. We have determined that AGG interruption pattern does not contribute to this association. Because only 13% of the variation is described using repeat size, it is clear that further research of FXPOI is needed to identify other factors that affect the risk for FXPOI.

Copyright information:

© 2018 Allen, Glicksman, Tortora, Charen, He, Amin, Hipp, Shubeck, Nolin and Sherman.

This is an Open Access work distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).
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