Understanding decreased fertility in women carriers of the FMR1 premutation: A possible mechanism for Fragile X-Associated Primary Ovarian Insufficiency (FXPOI)

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Abstract

Fragile X syndrome (FXS) and its associated disorders are caused by the expansion of the CGG repeat in the 5′ untranslated region of the fragile X mental retardation 1 gene (FMR1). The full mutation, defined as >200 cytosine-guanine-guanine (CGG) triplet repeats, causes FXS. Individuals with 55-199 CGG repeats, classified as premutation carriers, are affected by two distinct disorders depending on their premutation status. Disorders associated with premutation carriers include: Fragile X-associated Tremor Ataxia Syndrome (FXTAS) and Fragile X-associated Primary Ovarian Insufficiency (FXPOI). The molecular similarities of FXTAS and FXPOI (e.g. overabundance of FMR1 transcript and intranuclear inclusions) suggest that similar molecular mechanisms underlie both FXTAS and FXPOI. The current hypothesis describes the underlying mechanism for FXTAS as an mRNA gain-of-function mutation, however the underlying mechanism for FXPOI remains unresolved. New data suggests that repeat associated non-AUG (RAN) translation could underlie FXPOI.

Original languageEnglish (US)
Article number67
JournalReproductive Health
Volume11
Issue number1
DOIs
StatePublished - Aug 19 2014

Keywords

  • CGG repeat
  • FMR1
  • FXPOI
  • Female reproductive health
  • Ovarian insufficiency

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynecology

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