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Semin Reprod Med 2011; 29(4): 299-307
DOI: 10.1055/s-0031-1280915
© Thieme Medical Publishers

FMR1 and the Continuum of Primary Ovarian Insufficiency

Shannon D. Sullivan1 , Corrine Welt2 , Stephanie Sherman3
  • 1Washington Hospital Center, Department of Endocrinology, Washington, DC
  • 2Reproductive Endocrine Unit, Massachusetts General Hospital, Boston, Massachusetts
  • 3Department of Human Genetics, Emory University, Atlanta, Georgia
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Publikationsverlauf

Publikationsdatum:
03. Oktober 2011 (online)

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ABSTRACT

Spontaneous 46,XX primary ovarian insufficiency (POI) is a term that describes ovarian dysfunction resulting in a range of abnormalities, from infertility to early menopause as the end stage (overt POI). The most common known genetic cause of 46,XX POI is the expansion of a CGG repeat to 55 to 199 copies in the 5′ untranslated region in the X-linked FMR1 gene. This “premutation” is associated with overt POI (FXPOI) in ~20% of carrier women. Greater than 200 CGG copies results in methylation of the CGG repeats and subsequent silencing of the FMR1 gene, causing fragile X syndrome. This “full” mutation is not associated with FXPOI. Even in the absence of overt FXPOI, women who carry the premutation may exhibit ovarian dysfunction along a continuum of severity. Evidence also suggests that the severity of FXPOI depends on the CGG repeat length, background modifier genes, and environmental factors (e.g., smoking). This review explores the range of ovarian dysfunction, the mechanisms behind the dysfunction, and the reasons for the variability in presentation in women who carry the FMR1 premutation. Understanding the mechanisms responsible for development of FXPOI is paramount to providing these women with the best overall health care.

KEYWORDS

Primary ovarian insufficiency - premature ovarian failure - fragile X syndrome - Fragile X Mental Retardation 1 (FMR1) gene

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Shannon D SullivanM.D. Ph.D. 

Washington Hospital Center

110 Irving St. NW, Suite 217–72, Washington, DC 20010

eMail: Shannon.D.Sullivan@Medstar.net