Journal
INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY
Volume 38, Issue 11, Pages 969-976Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ibmb.2008.07.010
Keywords
Lepidoptera; Chemosensory protein (CSP); Odorant binding protein (OBP); EST analysis; Genomic gene cluster; Diversification by gene duplication
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Chemoreception is a key feature for selection of host plants by phytophagous insects. Female swallowtail butterflies recognize their host plants using chemosensilla present on foreleg tarsi. We constructed a cDNA library of female tarsi and a genome library of Papilio xuthus. We identified 11 chemosensory protein (CSP) genes and three odorant binding proteins (OBP) genes from the cDNA library and eight additional CSP genes from the genome library using the ESTs as probes. A sequence similarity tree of insect CSPs showed that lepidopteran CSPs constructed big branches of the order. Small numbers of CSPs have been identified from the whole genomes of several insect orders which belong to branches separated from those of Lepidoptera. The CSP gene family of Lepidoptera may have diverged in at least two steps, the first on a small scale and the second on a large scale before and after the diversification of insect orders, respectively. Seventeen of 19 CSP genes of P. xuthus clustered in a specific region of the genome, suggesting that they were diversified by gene duplication from a common ancestral gene. (C) 2008 Elsevier Ltd. All rights reserved.
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