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Título

Expression of juvenile hormone acid O-methyltransferase and juvenile hormone synthesis in Blattella germanica

AutorDomíngez, Claudia; Maestro, José L.
Palabras claveBlattella germanica
Corpora allata
JHAMT
Juvenile hormone
Nutritional signaling
Fecha de publicación4-abr-2017
EditorJohn Wiley & Sons
CitaciónInsect Science (2017)
ResumenJuvenile hormone (JH), a sesquiterpenoid synthetized by the insect corpora allata (CA), plays critical roles in metamorphosis and reproduction. Penultimate or last step of JH synthesis is catalyzed by juvenile hormone acid O-methyltransferase (JHAMT). Here we report the cloning and expression analysis of the JHAMT orthologue in the cockroach, Blattella germanica (L.) (BgJHAMT). BgJHAMT is mainly expressed in CA, with only expression traces in ovary. Three different isoforms, differing in the 3′-UTR sequence, were identified. Isoform A shows between 35 and 65 times higher expression than B and C in CA from penultimate nymphal instar and adult females. RNAi-triggered knock down of BgJHAMT produces a dramatic reduction of JH synthesis, concomitant with a decrease of fat body vitellogenin expression and basal follicle length. BgJHAMT mRNA levels in CA of females along the gonadotrophic cycle parallel, with a slight advancement, JH synthesis profile. BgJHAMT mRNA levels were reduced in starved females and in females in which we reduced nutritional signaling by knocking down insulin receptor and target of rapamycin (TOR). Results show that conditions that modify JH synthesis in adult B. germanica females show parallel changes of BgJHAMT mRNA levels and that the JH-specific branch of the JH synthesis pathway is regulated in the same way as the mevalonate branch. Furthermore, we demonstrate that nutrition and its signaling through the insulin receptor and TOR pathways are essential for activating BgJHAMT expression, which suggests that this enzyme can be a checkpoint for the regulation of JH production in relation to nutritional status.
Versión del editorhttps://doi.org/10.1111/1744-7917.12467
URIhttp://hdl.handle.net/10261/148115
DOI10.1111/1744-7917.12467
ISSN1672-9609
E-ISSN1744-7917
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