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. 1997 Dec;61(6):1362–1369. doi: 10.1086/301647

Fragile X premutations are not a major cause of early menopause.

A Kenneson 1, D W Cramer 1, S T Warren 1
PMCID: PMC1716097  PMID: 9399905

Abstract

Fragile X syndrome is an X-linked mental retardation condition that usually is due to a trinucleotide-repeat expansion in the FMR1 gene. Whereas full-mutation alleles (> 230 repeats) lead to fragile X syndrome, premutation alleles (approximately 60-200 repeats) are apparently non-penetrant. However, previous studies have suggested that female premutation carriers may have an increased incidence of premature menopause. To test this possible association, we screened for premutation alleles among 216 women with early menopause (at age < 47 years), 33 of whom had premature menopause (at age < 40 years), as well as among 107 control women, all of whom were ascertained solely on the basis of age at menopause. No full-mutation alleles were found; and only one premutation allele was found, but, it was in a member of the control group. These results are consistent with what would be expected on the basis of chance only. Our sample size was sufficient to rule out a > or = 3-fold increased risk of early menopause and a > or = 9-fold increased risk of premature menopause due to an FMR1 premutation, under a model considering the risk of both sporadic and familial early menopause. Likewise, our results rule out a > or = 4-fold increased risk of familial early menopause and a > or = 26-fold increased risk of familial premature menopause, under a less probable model in which only familial early menopause is considered. These results indicate that the fragile X premutation is not a major risk factor for early menopause and suggest that the risk of premature menopause to fragile X-premutation carriers may not be as great as that reported elsewhere.

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Selected References

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