Human Reproduction, Vol. 15, No. 12, 2644-2649,
December 2000
© 2000 European Society of Human Reproduction and Embryology
Inhibin: a candidate gene for premature ovarian failure
1 Research Centre in Reproductive Medicine, Department of Obstetrics and Gynaecology and 2 Fertility PLUS, National Women's Hospital, Auckland, 3 School of Biological Sciences and 4 Department of Molecular Medicine, University of Auckland, Auckland, New Zealand, 5 Department of Obstetrics and Gynecology, University Medical Centre, Ljubljana, Slovenia and 6 Department of Clinical Genetics, Helsinki University Central Hospital, Helsinki, Finland
Premature ovarian failure (POF) occurs in 1% of all women, and in 0.1% of women under the age of 30 years. The mechanisms that give rise to POF are largely unknown. Inhibin has a role in regulating the pituitary secretion of FSH, and is therefore a potential candidate gene for ovarian failure. Using single-stranded conformation polymorphism (SSCP) and DNA sequencing, DNA samples were screened from 43 women with POF for mutations in the three inhibin genes. Two variants were found: a 1032C
T transition in the INHßA gene in one patient, and a 769G
A transition in the INH
gene in three patients. The INHßA variant appears to be a polymorphism, as there was no change in the amino acid sequence of the gene product. The INH
variant resulted in a non-conservative amino acid change, with a substitution from alanine to threonine. This alanine is highly conserved across species, and has the potential to affect receptor binding. The INH
variant is significantly associated with POF (3/43 patients; 7%) compared with control samples (1/150 normal controls; 0.7%) (Fisher's exact test, P < 0.035). Further analysis of the inhibin gene in POF patients and matched controls will determine its role in the aetiology of POF.
Key words: infertility/inhibin/mutation detection/ovarian failure/premature
7 To whom correspondence should be addressed at: Research Centre in Reproductive Medicine, Department of Obstetrics and Gynaecology, National Women's Hospital, Auckland, New Zealand. E-mail: a.shelling{at}auckland.ac.nz
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