Cell
Volume 64, Issue 4, 22 February 1991, Pages 849-859
Journal home page for Cell

Article
Parental imprinting of the mouse insulin-like growth factor II gene

https://doi.org/10.1016/0092-8674(91)90513-XGet rights and content

Abstract

We are studying mice that carry a targeted disruption of the gene encoding insulin-like growth factor II (IGF-II). Transmission of this mutation through the male germline results in heterozygous progeny that are growth deficient. In contrast, when the disrupted gene is transmitted maternally, the heterozygous offspring are phenotypically normal. Therefore, the difference in growth phenotypes depends on the type of gamete contributing the mutated allele. Homozygous mutants are indistinguishable in appearance from growth-deficient heterozygous siblings. Nuclease protection and in situ hybridization analyses of the transcripts from the wild-type and mutated alleles indicated that only the paternal allele is expressed in embryos, while the maternal allele is silent. An exception is the choroid plexus and leptomeninges, where both alleles are transcriptionally active. These results demonstrate that IGF-II is indispensable for normal embryonic growth and that the IGF-II gene is subject to tissue-specific parental imprinting.

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