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. 1985 Jun;5(6):1268–1278. doi: 10.1128/mcb.5.6.1268

Locus encoding a family of small heat shock genes in Caenorhabditis elegans: two genes duplicated to form a 3.8-kilobase inverted repeat.

R H Russnak, E P Candido
PMCID: PMC366854  PMID: 4033652

Abstract

The genes coding for hsp 16-48, previously identified by cDNA cloning, and for another 16-kilodalton heat shock protein designated hsp16-1 were characterized by DNA sequencing. The two genes were arranged in a head-to-head orientation. Both the coding and flanking regions were located within a 1.9-kilobase module which was duplicated exactly to form a 3.8-kilobase inverted repeat structure. The inverted repeat structure ended in an unusual guanine-plus-cytosine-rich sequence 24 nucleotides in length. The identity of the two modules at the nucleotide sequence level implies that the duplication event may have occurred recently. Alternatively, gene conversion between the two modules could also maintain homology of the two gene pairs. The small heat shock genes of Caenorhabditis elegans contained TATA boxes and heat-inducible promoters, the latter agreeing closely with the Drosophila melanogaster consensus sequence described by Pelham (Cell 30:517-528, 1982). Unlike the homologous D. melanogaster genes, each of these C. elegans genes contained a short intron, the position of which has been conserved in a related murine alpha-crystallin gene. The intron separated variable and conserved regions within the amino acid sequences of the encoded heat shock polypeptides.

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Selected References

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