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Genetics, Vol. 178, 35-45, January 2008, Copyright © 2008
doi:10.1534/genetics.107.081562

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Parental Effect of DNA (Cytosine-5) Methyltransferase 1 on Grandparental-Origin-Dependent Transmission Ratio Distortion in Mouse Crosses and Human Families

Lanjian Yang*, Moises Freitas Andrade{dagger},1, Stephane Labialle{dagger}, Sanny Moussette{dagger}, Geneviève Geneau{ddagger}, Donna Sinnett{ddagger}, Alexandre Belisle{ddagger}, Celia M. T. Greenwood§ and Anna K. Naumova*,{dagger},2

* Department of Human Genetics, Faculty of Medicine, McGill University, Montreal, Quebec H3A 1B1, Canada, {dagger} Department of Obstetrics and Gynecology, Faculty of Medicine, McGill University, and the Research Institute of the McGill University Health Centre, Montreal, Quebec H3A 1A1, Canada, {ddagger} McGill University and Genome Quebec Innovation Centre, Montreal, Quebec H3A 1A4, Canada and § Hospital for Sick Children, Research Institute, Program in Genetics and Genome Biology, Toronto, Ontario M5G 1L7 and the Department of Public Health Sciences, University of Toronto, Toronto, Ontario M5T 3M7, Canada

2 Corresponding author: Department of Obstetrics and Gynecology, Royal Victoria Hospital, Women's Pavilion, F3.32, 687 Pine Ave. West, Montreal, QC H3A 1A1, Canada.
E-mail: anna.naumova{at}muhc.mcgill.ca

Transmission ratio distortion (TRD) is a deviation from the expected Mendelian 1:1 ratio of alleles transmitted from parents to offspring and may arise by different mechanisms. Earlier we described a grandparental-origin-dependent sex-of-offspring-specific TRD of maternal chromosome 12 alleles closely linked to an imprinted region and hypothesized that it resulted from imprint resetting errors in the maternal germline. Here, we report that the genotype of the parents for loss-of-function mutations in the Dnmt1 gene influences the transmission of grandparental chromosome 12 alleles. More specifically, maternal Dnmt1 mutations restore Mendelian transmission ratios of chromosome 12 alleles. Transmission of maternal alleles depends upon the presence of the Dnmt1 mutation in the mother rather than upon the Dnmt1 genotype of the offspring. Paternal transmission mirrors the maternal one: live-born offspring of wild-type fathers display 1:1 transmission ratios, whereas offspring of heterozygous Dnmt1 mutant fathers tend to inherit grandpaternal alleles. Analysis of allelic transmission in the homologous region of human chromosome 14q32 detected preferential transmission of alleles from the paternal grandfather to grandsons. Thus, parental Dnmt1 is a modifier of transmission of alleles at an unlinked chromosomal region and perhaps has a role in the genesis of TRD.






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Copyright © 2008 by the Genetics Society of America.