Genetics, Vol. 168, 1557-1562, November 2004, Copyright © 2004
doi:10.1534/genetics.104.032177

A Complex Interaction of Imprinted and Maternal-Effect Genes Modifies Sex Determination in Odd Sex (Ods) Mice

* Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas 77030
§§ Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030
{ddagger} Broad Institute, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142
{dagger} Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142
** Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142
§ Department of Genetics, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106
{dagger}{dagger} Center for Computational Genomics and Systems Biology, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106
{ddagger}{ddagger} Department of Epidemiology and Biostatistics, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106

1 Corresponding author: Department of Obstetrics and Gynecology, Smith Tower, Room 880, Baylor College of Medicine, 6550 Fannin St., Houston, TX 77030.
E-mail: bishop{at}bcm.tmc.edu

The transgenic insertional mouse mutation Odd Sex (Ods) represents a model for the long-range regulation of Sox9. The mutation causes complete female-to-male sex reversal by inducing a male-specific expression pattern of Sox9 in XX Ods/+ embryonic gonads. We previously described an A/J strain-specific suppressor of Ods termed Odsm1A. Here we show that phenotypic sex depends on a complex interaction between the suppressor and the transgene. Suppression can be achieved only if the transgene is transmitted paternally. In addition, the suppressor itself exhibits a maternal effect, suggesting that it may act on chromatin in the early embryo.




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