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Science 9 November 2001:
Vol. 294. no. 5545, pp. 1331 - 1334
DOI: 10.1126/science.1065683

Reports

Trithorax and dCBP Acting in a Complex to Maintain Expression of a Homeotic Gene

Svetlana Petruk,1* Yurii Sedkov,1* Sheryl Smith,1 Sergei Tillib,1 Vladislav Kraevski,1 Tatsuya Nakamura,1 Eli Canaani,12 Carlo M. Croce,1 Alexander Mazo1dagger

Trithorax (Trx) is a member of the trithorax group (trxG) of epigenetic regulators, which is required to maintain active states of Hox gene expression during development. We have purified from Drosophila embryos a trithorax acetylation complex (TAC1) that contains Trx, dCBP, and Sbf1. Like CBP, TAC1 acetylates core histones in nucleosomes, suggesting that this activity may be important for epigenetic maintenance of gene activity. dCBP and Sbf1 associate with specific sites on salivary gland polytene chromosomes, colocalizing with many Trx binding sites. One of these is the site of the Hox gene Ultrabithorax (Ubx). Mutations in either trx or the gene encoding dCBP reduce expression of the endogenous Ubx gene as well as of transgenes driven by the bxd regulatory region of Ubx. Thus Trx, dCBP, and Sbf1 are closely linked, physically and functionally, in the maintenance of Hox gene expression.

1 Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA.
2 Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel.
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed. E-mail: A_Mazo{at}lac.jci.tju.edu


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