Development, Vol 118, Issue 3 731-736, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Rescue of the T-associated maternal effect in mice carrying null mutations in Igf-2 and Igf2r, two reciprocally imprinted genes

AJ Filson, A Louvi, A Efstratiadis and EJ Robertson
Department of Genetics and Development, Columbia University, New York, NY 10032.

In mice, only the paternal allele of the Igf2 gene, encoding insulin-like growth factor II (IGF-II) is expressed due to parental imprinting. Interestingly, the Igf2r gene, which encodes one of the two known receptors (IGF2R) to which IGF-II binds with high affinity is also subject to imprinting, but in a reciprocal fashion. This observation raises the possibility that imprinting of these loci serves to regulate the ratios of the gene products, since IGF2R provides a mechanism for IGF-II turnover. To test this hypothesis, we crossed mice mutant for Igf-2 with animals carrying the Thp chromosomal deletion, which encompasses the Igf2r locus. Inheritance of the Thp chromosome through the maternal germline results in a dominant lethal maternal effect (Tme). However, as we show here, Thp/+ embryos that inherit the Thp maternally are variably rescued to birth if they also lack IGF-II. Based on these data, the Tme phenotype can be viewed as a dominant effect resulting from an overabundance of IGF-II.

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