Hum. Reprod. Advance Access originally published online on July 9, 2008
Human Reproduction 2008 23(10):2372-2379; doi:10.1093/humrep/den268
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Variation in bone morphogenetic protein 15 is not associated with spontaneous human dizygotic twinning
1 Molecular Epidemiology, Queensland Institute of Medical Research, Royal Brisbane Hospital, 300 Herston Rd, Brisbane, QLD 4029, Australia 2 Genetic Epidemiology, Queensland Institute of Medical Research, Brisbane, Australia 3 Cancer and Population Studies, Queensland Institute of Medical Research, Brisbane, Australia 4 Oncogenomics, Queensland Institute of Medical Research, Brisbane, Australia 5 Biological Psychology Department, Free University, Amsterdam, The Netherlands
6 Correspondence address. Tel: +61-7-3362-0247; Fax: +61-7-3362-0101; E-mail: grant.montgomery{at}qimr.edu.au
BACKGROUND: Spontaneous dizygotic (DZ) twinning in humans is under genetic control. In sheep, heterozygous loss of function mutations in bone morphogenetic protein 15 (BMP15) increase ovulation and hence twinning rates.
METHODS: To investigate the role of BMP15 in human twinning, we typed 14 common variants, 4 rare novel variants initially detected by sequencing 279 mothers of DZ twins (MODZT) and 17 variants previously associated with premature ovarian failure (POF) in 933 DZ twinning families. We also typed five additional POF associated GDF9 variants.
RESULTS: There was some evidence for association between DZ twinning and a common intronic BMP15 variant (rs3897937), but this was not significant after correction for multiple testing. Three of the four novel variants (p.Pro174Ser, p.Ala311Thr and p.Arg392Thr) occurred in 1–5 MODZT but were not detected in 1512 controls. We also detected three POF associated mutations in both BMP15 and GDF9 at low frequencies in MODZT and controls.
CONCLUSIONS: We conclude that neither rare nor common BMP15 variants play a significant role in the variation in human DZ twinning.
Key words: dizygotic twinning/BMP15/variation/genetic association/primary ovarian failure
Submitted on January 23, 2008; resubmitted on June 11, 2008; accepted on June 16, 2008.