PMID: 7544754Sep 1, 1995Paper

An enhancer deletion affects both H19 and Igf2 expression

Genes & Development
P A LeightonS M Tilghman

Abstract

The distal end of mouse Chromosome 7 contains four tightly linked genes whose expression is dependent on their parental inheritance. Mash-2 and H19 are expressed exclusively from the maternal chromosome, whereas Insulin-2 (Ins-2) and Insulin-like growth factor 2 (Igf2) are paternally expressed. The identical expression during development of the 3'-most genes in the cluster, Igf2 and H19, led to the proposal that their imprinting was mechanistically linked through a common set of transcriptional regulatory elements. To test this hypothesis, a targeted deletion of two endoderm-specific enhancers that lie 3' of H19 was generated by homologous recombination in embryonic stem cells. Inheritance of the enhancer deletion through the maternal lineage led to a loss of H19 gene expression in cells of endodermal origin, including cells in the liver, gut, kidney, and lung. Paternal inheritance led to a very similar loss in the expression of Igf2 RNA in the same tissues. These results establish that H19 and Igf2 utilize the same endoderm enhancers, but on different parental chromosomes. Mice inheriting the enhancer deletion from fathers were 80% of normal size, reflecting a partial loss-of-function of Igf2. The reduction was uniformly obser...Continue Reading

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