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An enhancer element at the Igf2/H19 locus drives gene expression in both imprinted and non-imprinted tissues


Charalambous, M and Menheniott, TR and Bennett, WR and Kelly, SM and Dell, G and Dandolo, L and Ward, A, An enhancer element at the Igf2/H19 locus drives gene expression in both imprinted and non-imprinted tissues , Developmental Biology: An International Journal, 271, (2) pp. 488-497. ISSN 0012-1606 (2004) [Refereed Article]

DOI: doi:10.1016/j.ydbio.2004.04.022


The insulin-like growth factor 2 (Igf2) gene encodes a potent growth factor that is expressed in multiple tissues during embryonic development. Expression at this locus is mediated by genomic imprinting. In the developing endodermal tissues, imprinting of Igf2 is mediated by the interaction of a set of enhancers downstream of the linked H19 gene with a differentially methylated domain (DMD) that lies approximately 2-4 kb upstream of H19 that has a boundary or insulator function in the hypomethylated state. In the remainder of tissues that express Igf2 and H19, the cis elements that drive their correct expression and imprinting are not well understood. In addition, enhancers driving expression of Igf2 in the choroid plexus and leptomeninges, tissues where the gene is thought not to be imprinted, have not been isolated. Here we show that biallelic (non-imprinted) expression within the choroid plexus is restricted to the epithelium, and we provide evidence that a conserved intergenic region functions as an enhancer for Igf2 both in tissues where the gene is imprinted, and where Igf2 is biallelically expressed. The presence of an enhancer for imprinted tissues in the intergenic region argues for the existence of imprinting controls distinct from the DMD, which may be provided by differential methylation at sites proximal to Igf2. © 2004 Elsevier Inc. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Developmental genetics (incl. sex determination)
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Bennett, WR (Dr Bill Bennett)
ID Code:63715
Year Published:2004
Web of Science® Times Cited:31
Deposited By:Menzies Institute for Medical Research
Deposited On:2010-05-26
Last Modified:2011-08-01

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