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Development, Vol 127, Issue 18 3923-3930, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
JF Ainscough, RM John, SC Barton and MA Surani
Wellcome/CRC Institute of Cancer and Developmental Biology, and Physiological Laboratory, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QR, UK. jfxa1@mole.bio.cam.ac.uk
Igf2 and H19 are closely linked and reciprocally expressed genes on distal chromosome 7 in the mouse. We have previously shown that a 130 kb YAC transgene contains multiple tissue-specific enhancers for expression of both genes during embryogenesis. The YAC also contains all the crucial elements responsible for initiating and maintaining appropriate parent-of-origin-specific expression of these genes at ectopic sites, with expression of Igf2 after paternal inheritance and of H19 after maternal inheritance. Located centrally between Igf2 and H19 are two prominent DNaseI hypersensitive sites, and two stretches of sequence that are conserved between mouse and human. In this study, we have deleted, from the transgene, a one kb part of the intergenic region that contains the hypersensitive sites and one of the homologous stretches. We demonstrate that this deletion results in loss of maternal Igf2 repression in skeletal muscle cells, most strikingly in the tongue, late in embryogenesis. We propose that the intergenic region functions as a tissue-specific repressor element, forming an integral part of the complex regulatory mechanism that controls monoallelic gene expression in this domain.
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