Significance of a common single nucleotide polymorphism in exon 10 of the follicle-stimulating hormone (FSH) receptor gene for the ovarian response to FSH: a pharmacogenetic approach to controlled ovarian hyperstimulation

Abstract

The p.N680S sequence variation of the follicle-stimulating hormone (FSH) receptor gene was previously shown to influence the ovarian response to FSH in normo-ovulatory women undergoing controlled ovarian hyperstimulation. In this prospective, randomized, controlled study, we tested whether the same daily dose of FSH results in lower levels of oestradiol in women homozygous for the p.N680S sequence variation, and whether the difference can be overcome by higher FSH doses. Women undergoing controlled ovarian hyperstimulation for in vitro fertilization or intracytoplasmic sperm injection and homozygous for the wild-type or for the p.N680S FSH receptor were randomly assigned to group I (Ser/Ser, n=24), receiving an FSH dose of 150 U/day, or group II (Ser/Ser, n=25), receiving an FSH dose of 225 U/day. In group III (Asn/Asn, n=44), the FSH dose was 150 U/day. Age and basal FSH levels were not different between groups. At ovulation induction, total FSH doses were comparable in group I (1631±96 U) and group III (1640±57 U) but significantly higher in group II (2421±112 U) (P