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J Mol Biol. 2004 Nov 19;344(2):369-81.

Differential hypoxia response of hsp-16 genes in the nematode.

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1
National Research Laboratory, Department of Biology, Yonsei University, 134 Shinchon, Seoul, 120-749 South Korea, Korea.

Abstract

Small heat shock proteins are induced by various stresses. We here report the differential hypoxia responses of the hsp-16 genes in the nematode. The hsp-16.1 and hsp-16.2 genes in Caenorhabditis elegans responded to hypoxia, while hsp-16.41 and hsp-16.48, which share the promoter regions with hsp-16.1 and hsp-16.2, respectively, did not. For comparative genomic analysis, we identified ten hsp-16 genes in the nematode C.briggsae from the genome database. The comparison of the promoter sequences revealed a new conserved sequence block, CAC(A/T)CT, that was required for the orientation-dependent hypoxia response, but not for other stress responses such as heat or ethanol. We propose a working model for the orientation-dependent promoter usage between two genes sharing the promoter region. We also discuss a possible application of the hypoxia-inducible promoter for conditional gene expression.

PMID:
15522291
DOI:
10.1016/j.jmb.2004.09.077
[Indexed for MEDLINE]

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