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We cloned and sequenced the cDNA which encodes the Caenorhabditis elegans homologue (suf-1) of the Drosophila suppressor of forked (su(f)) gene product. The amino acid sequence deduced from the suf-1 cDNA shares extensive similarity with the su(f) and the human 77K subunit of the CstF, including the proline residues near the carboxy-terminus. Developmental Northern blot analysis showed that a 2.6-kb suf-1 transcript was expressed constitutively from L1 to young adult stages, suggesting it has a housekeeping function in vivo. Furthermore, this idea is consistent with the recent proposition that su(f) homologues play an essential role as a subunit of the cleavage stimulation factor (CstF) during polyadenylation of mRNA precursors.

Developmental Expression Pattern of the Caenorhabditis elegans Homologue of the Drosophila suppressor of forked Gene