PMID: 8943029Nov 26, 1996Paper

The structural H19 gene is required for transgene imprinting

Proceedings of the National Academy of Sciences of the United States of America
K PfeiferS M Tilghman

Abstract

The product of the H19 gene is an untranslated RNA that is expressed exclusively from the maternal chromosome during mammalian development. The H19 gene and its 5'-flanking sequence are required for the genomic imprinting of two paternally expressed genes, Ins-2 (encodes insulin-2) and Igf-2 (encodes insulin-like growth factor-2), that lie 90 and 115 kb 5' to the H19 gene, respectively. In this report, the role of the H19 gene in its own imprinting is investigated by introducing a Mus spretus H19 gene into heterologous locations in the mouse genome. Multiple copies of the transgene were sufficient for its paternal silencing and DNA methylation. Replacing the H19 structural gene with a luciferase reporter gene resulted in loss of imprinting of the transgene. That is, high expression and low levels of DNA methylation were observed upon both paternal and maternal inheritance. The removal of 701 bp at the 5' end of the structural gene resulted in a similar loss of paternal-specific DNA methylation, arguing that those sequences are required for both the establishment and maintenance of the sperm-specific gametic mark. The M. spretus H19 transgene could not rescue the loss of Igf-2 imprinting in trans in H19 deletion mice, implying a...Continue Reading

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