Global regulation of Hox gene expression in C. elegans by a SAM domain protein

Hong Zhang, Ricardo B.R. Azevedo, Robyn Lints, Christina Doyle, Yingqi Teng, Daniel Haber, Scott W. Emmons

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Polycomb group (PcG)-mediated repression of C. elegans Hox genes has not been demonstrated, and genes homologous to components of one of the PcG complexes (PRC1) have not been identified in the C. elegans genome. We find that a mechanism of general Hox gene repression exists in C. elegans, carried out in part by SOP-2, a protein related to, but not orthologous with, any PcG protein. sop-2 mutations lead to widespread ectopic expression of Hox genes and homeotic transformations. SOP-2 contains a SAM domain, a self-associating protein domain found in other repressors, including a core component of PRC1 and ETS transcription factors. Phylogenetic analysis indicates that this domain is more closely related to those of the ETS family than to those of PcG proteins. The results suggest that global repression of Hox genes has been taken over by a different branch of the SAM domain family during the evolution of nematodes.

Original languageEnglish (US)
Pages (from-to)903-915
Number of pages13
JournalDevelopmental cell
Issue number6
StatePublished - Jun 1 2003

ASJC Scopus subject areas

  • Molecular Biology
  • General Biochemistry, Genetics and Molecular Biology
  • Developmental Biology
  • Cell Biology


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