Variation in BMPR1B, TGFRB1 and BMPR2 and control of dizygotic twinning

Luong, Hien T.T., Chaplin, Justine, McRae, Allan F., Medland, Sarah E., Willemsen, Gonneke, Nyholt, Dale R., Henders, Anjali K., Hoekstra, Chantal, Duffy, David L., Martin, Nicholas G., Boomsma, Dorret I., Montgomery, Grant W., & Painter, Jodie N. (2011) Variation in BMPR1B, TGFRB1 and BMPR2 and control of dizygotic twinning. Twin Research and Human Genetics, 14(5), pp. 408-416.

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Genes in the TGF9 signaling pathway play important roles in the regulation of ovarian follicle growth and ovulation rate. Mutations in three genes in this pathway, growth differentiation factor 9 (GDF9), bone morphogenetic protein 15 (BMP15) and the bone morphogenetic protein receptor B 1 (BMPRB1), influence dizygotic (DZ) twinning rates in sheep. To date, only variants in GDF9 and BMP15, but not their receptors transforming growth factor ss receptor 1 (TGFBR1), bone morphogenetic protein receptor 2 (BMPR2) and BMPR1B, have been investigated with respect to their roles in human DZ twinning. We screened for rare and novel variants in TGFBR1, BMPR2 and BMPR1B in mothers of dizygotic twins (MODZT) from twin-dense families, and assessed association between genotyped and imputed variants and DZ twinning in another large sample of MODZT. Three novel variants were found: a deep intronic variant in BMPR2, and one intronic and one non-synonymous exonic variant in BMPRB1 which would result in the replacement of glutamine by glutamic acid at amino acid position 294 (p.Gln294Glu). None of these variants were predicted to have major impacts on gene function. However, the p.Gln294Glu variant changes the same amino acid as a sheep BMPR1B functional variant and may have functional consequences. Six BMPR1B variants were marginally associated with DZ twinning in the larger case-control sample, but these were no longer significant once multiple testing was taken into account. Our results suggest that variation in the TGF9 signaling pathway type II receptors has limited effects on DZ twinning rates in humans.

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ID Code: 91918
Item Type: Journal Article
Refereed: Yes
Keywords: Bone Morphogenetic Protein Receptors, Type I/*genetics, Bone Morphogenetic Protein Receptors, Type II/*genetics, DNA/analysis/genetics, Genetic Association Studies, Genetic Variation/*genetics, Humans, Polymerase Chain Reaction, Protein-Serine-Threonine Kinases/*genetics, Receptors, Transforming Growth Factor beta/*genetics, Signal Transduction, Twins, Dizygotic/*genetics
DOI: 10.1375/twin.14.5.408
ISSN: 1832-4274
Deposited On: 14 Jan 2016 23:15
Last Modified: 20 Jan 2016 05:35

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