Fragile X premutation screening in women with premature ovarian failure.

We have screened 132 women with premature ovarian failure for fragile X (FRAXA) premutations. Three out of 23 (13%) pedigrees with the familial premature ovarian failure and 3/106 (3%) of women with the sporadic form of premature ovarian failure have FRAXA premutations compared with an expected prevalence of 1:590 (P=0.02). The mechanism of the association between FRAXA premutations and premature ovarian failure is unknown but as a genetic marker, FRAXA screening will be particularly valuable in predicting premature ovarian failure in some pedigrees and in the identification of families at risk of transmitting fragile X syndrome.