Organization and repression by juvenile hormone of a vitellogenin gene cluster in the crustacean, Daphnia magna
- 2 May 2006
- journal article
- Published by Elsevier BV in Biochemical and Biophysical Research Communications
- Vol. 345 (1), 362-370
- https://doi.org/10.1016/j.bbrc.2006.04.102
Abstract
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 NH2-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 NH2-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 2.6 kb 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.Keywords
Funding Information
- Ministry of Education, Culture, Sports, Science and Technology (1260067)
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