Abstract
The SET domain is a highly conserved domain shared between proteins of the antagonistic trithorax and Polycomb groups. It has been shown to play an important role in the assembly of either transcriptional activating or repressing protein complexes, and possesses a histone methyl-transferase activity. We report here the characterisation of the Caenorhabditis elegans gene, set-1, encoding a conserved SET-domain protein. We have analysed the developmental expression pattern of set-1 and show that maximal expression is observed early in development when set-1 is ubiquitously expressed. Its expression is more and more restricted as development progress. Gene inactivation by RNA interference shows that set-1 is an essential gene. Functional analysis of set-1 may contribute to the understanding of the molecular role of the SET domain.
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