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- Title
The homeobox gene Mohawk represses transcription by recruiting the sin3A/HDAC co-repressor complex.
- Authors
Anderson, Douglas M.; Beres, Brian J.; Wilson-Rawls, Jeanne; Rawls, Alan
- Abstract
Mohawk is an atypical homeobox gene expressed in embryonic progenitor cells of skeletal muscle, tendon, and cartilage. We demonstrate that Mohawk functions as a transcriptional repressor capable of blocking the myogenic conversion of 10T1/2 fibroblasts. The repressor activity is located in three small, evolutionarily conserved domains (MRD1-3) in the carboxy-terminal half of the protein. Point mutation analysis revealed six residues in MRD1 are sufficient for repressor function. The carboxy-terminal half of Mohawk is able to recruit components of the Sin3A/HDAC co-repressor complex (Sin3A, Hdac1, and Sap18) and a subset of Polymerase II general transcription factors (Tbp, TFIIA1 and TFIIB). Furthermore, Sap18, a protein that bridges the Sin3A/HDAC complex to DNA-bound transcription factors, is co-immunoprecipitated by MRD1. These data predict that Mohawk can repress transcription through recruitment of the Sin3A/HDAC co-repressor complex, and as a result, repress target genes required for the differentiation of cells to the myogenic lineage. Developmental Dynamics 238:572-580, 2009. © 2009 Wiley-Liss, Inc.
- Publication
Developmental Dynamics, 2009, Vol 238, Issue 3, p572
- ISSN
1058-8388
- Publication type
Article
- DOI
10.1002/dvdy.21873