Journal
CURRENT BIOLOGY
Volume 10, Issue 10, Pages 607-610Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/S0960-9822(00)00489-9
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Funding
- NIGMS NIH HHS [R01GM48103-04A2] Funding Source: Medline
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Parent-of-origin-specific expression of the mouse insulin-like growth factor 2 (Igf2) gene and the closely linked H19 gene are regulated by an intervening 2 kb imprinting control region (ICR), which displays parent-specific differential DNA methylation [1,2]. Four 21 bp repeats are embedded within the ICR and are conserved in the putative ICR of human and rat Igf2 and H19, suggesting that the repeats have a function [3,4]. Here, we report that prominent DNA footprints were found in vivo on the unmethylated maternal ICR at ail four 21 bp repeats, demonstrating the presence of protein binding. The methylated paternal ICR displayed no footprints. Significantly, the maternal-specific footprints were localized to putative binding sites for CTCF, a highly conserved zinc-finger DNA-binding protein with multiple roles in gene regulation including that of chromatin insulator function [5,6]. These results strongly suggest that the maternal ICR functions as an insulator element in regulating mutually exclusive expression of Igf2 and H19 in cis.
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