title: Conserved repressive function of Krüppel homolog 1 on insect metamorphosis in hemimetabolous and holometabolous species.
abstract: Insect metamorphosis is regulated by ecdysteroids, which induce molts, and juvenile hormone (JH), which inhibits metamorphic changes. The molecular action of ecdysteroids has been thoroughly studied, but that of JH is poorly understood, with data currently only being available for holometabolous species, like Drosophila melanogaster and Tribolium castaneum. We studied the function of Krüppel homolog 1 (Kr-h1) in Blattella germanica, a hemimetabolous model. Kr-h1 is a Zn finger transcription factor whose function as transductor of the antimetamorphic action of JH has recently been demonstrated in D. melanogaster and T. castaneum. The RNAi experiments reported herein indicated that Kr-h1 transduces the antimetamorphic action of JH also in B. germanica, thereby suggesting that this role is an ancestral condition that has been conserved in insect evolution from hemimetabolous to holometabolous species.
authors.affiliation: Institut de Biologia Evolutiva (CSIC-UPF), Passeig Martim de la Barceloneta 37 , 08003 Barcelona,  Spain.
authors.forename: Jesus
authors.initials: J
authors.lastname: Lozano
authors.forename: Xavier
authors.initials: X
authors.lastname: Belles
mesh_terms: D000818:Animals; D001483:Base Sequence; D020048:Blattellidae / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D017124:Conserved Sequence; D018076:DNA, Complementary / Q000235:genetics; D029721:Drosophila Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology; D004331:Drosophila melanogaster / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D019143:Evolution, Molecular; D005260:Female; D017344:Genes, Insect; D019476:Insect Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D007313:Insecta / Q000235:genetics / Q000254:growth & development* / Q000502:physiology*; D007605:Juvenile Hormones / Q000502:physiology; D051741:Kruppel-Like Transcription Factors / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D008297:Male; D008675:Metamorphosis, Biological / Q000502:physiology; D034622:RNA Interference; D013045:Species Specificity; D014231:Tribolium / Q000235:genetics / Q000254:growth & development / Q000502:physiology
chemical_list: D018076:DNA, Complementary; D029721:Drosophila Proteins; D019476:Insect Proteins; D007605:Juvenile Hormones; C497242:Kr-h1 protein, Drosophila; D051741:Kruppel-Like Transcription Factors