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Genetics, Vol 146, 1399-1405, Copyright © 1997
INVESTIGATIONS |
Paternal Transmission of X-Linked Placental Dysplasia in Mouse Interspecific Hybrids
U. Zechner, M. Reule, P. S. Burgoyne, A. Schubert, A. Orth, H. Hameister and R. Fundele
Max-Planck-Institut fur Molekulare Genetik, Berlin, Germany, Abteilung Medizinische Genetik der Universitat Ulm, Ulm, Germany
It has previously been shown that abnormal placental development, i.e., hyper- and hypoplasia, occurs in crosses and backcrosses between different mouse (Mus) species. These defects are caused mainly by abnormal growth of the spongiotrophoblast. The precise genetic basis for these placental malformations has not been determined. However, a locus that contributes to the abnormal development (Ihpd: interspecific hybrid placental dysplasia) has been mapped to the X chromosome. The X-chromosomal location of Ihpd and its site of action, that is the spongiotrophoblast, mean that normally only the maternally inherited Ihpd locus is active even in female fetuses. However, by making use of the X-chromosomal inversion In(X)1H, we have produced interspecific hybrid X(p)0, in which the active X chromosome was inherited from Mus macedonicus males. In contrast to XX female and XY male conceptuses from this cross, which have hypoplastic placentas, the X(p)0 female conceptuses have hyperplastic placentas. This finding supports the view that it is expression of the M. macedonicus Ihpd locus in the spongiotrophoblast that leads to hyperplasia due to an abnormal interaction with M. musculus autosomal loci.
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