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. 1993 Dec 17;75(6):1187-98.
doi: 10.1016/0092-8674(93)90328-n.

Mapping Polycomb-repressed domains in the bithorax complex using in vivo formaldehyde cross-linked chromatin

V Orlando  1 , R Paro
Affiliations

Mapping Polycomb-repressed domains in the bithorax complex using in vivo formaldehyde cross-linked chromatin

V Orlando et al. Cell. .

Abstract

The Polycomb group (Pc-G) proteins are responsible for keeping developmental regulators, like homeotic genes, stably and inheritably repressed during Drosophila development. Several similarities to a protein class involved in heterochromatin formation suggest that the Pc-G exerts its function at the higher order chromatin level. Here we have mapped the distribution of the Pc protein in the homeotic bithorax complex (BX-C) of Drosophila tissue culture cells. We have elaborated a method, based on the in vivo formaldehyde cross-linking technique, that allows a substantial enrichment for Pc-interacting sites by immunoprecipitation of the cross-linked chromatin with anti-Pc antibodies. We find that the Pc protein quantitatively covers large regulatory regions of repressed BX-C genes. Conversely, we find that the Abdominal-B gene is active in these cells and the region devoid of any bound Pc protein.

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