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During animal development, Hox genes are expressed in characteristic, spatially restricted patterns and specify regional identities along the anterior–posterior (A–P) axis. Polycomb group (PcG) proteins in Drosophila repress Hox expression and maintain the expression patterns during development. Mice deficient for homologues of the Drosophila PcG genes, such as M33, bmi1, mel18, rae28 and eed, show...
The Polycomb group of (PcG) genes were originally described in Drosophila, but many PcG genes have mammalian homologs. Genetic studies in flies and mice show that mutations in PcG genes cause posterior transformations caused by failure to maintain repression of homeotic loci, suggesting that PcG proteins have conserved functions. The Drosophila gene Sex comb on midleg (Scm) encodes an unusual PcG...
Polycomb group genes were originally identified in Drosophila as repressors required to maintain the silenced state of homeotic loci. About ten Polycomb group genes have been cloned in Drosophila, and mammalian homologs have been identified for most of these. Here, we isolate cDNAs encoding two isoforms of a human homolog of Drosophila Sex comb on midleg (Scm), named Sex comb on midleg homolog-1 (SCMH1)...
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