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Tokishita, S. et al.

Tokishita, Kato, Kobayashi, Nakamura, Ohta, Yamagata,

Organization and repression by juvenile hormone of a vitellogenin gene cluster in the crustacean, Daphnia magna.

Two Daphnia magna vitellogenin (VTG) genes in neighboring but opposite orientations were identified. One was the gene for DmagVTG1, a previously characterized VTG polypeptide with a superoxide dismutase (SOD)-like domain at its NH(2)-terminus [Kato et al., Gene 334 (2004) 157-165]. Both genes had a 17-exon and 16-intron structure in the same configuration. DmagVTG2, a polypeptide encoded by the other gene, also had a SOD-like domain at its NH(2)-terminus. The amino acid sequences of the two VTG domains were highly homologous (95.5% identity), while those of the SOD-like domains were less homologous (62.4% identity). The VTG domains are phylogenetically related to insect VTGs while the SOD-like domains are related to viral and bacterial SODs. The intergenic region of 2.6kb between the two genes contains sequences resembling known juvenile hormone (JH)-responsive and ecdysone-responsive elements. JH agonists, pyriproxyfen and fenoxycarb, strongly repressed the expression of VTG genes in neonate daphnids.[1]

References

Organization and repression by juvenile hormone of a vitellogenin gene cluster in the crustacean, Daphnia magna. Tokishita, S., Kato, Y., Kobayashi, T., Nakamura, S., Ohta, T., Yamagata, H. Biochem. Biophys. Res. Commun. (2006) [Pubmed]

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