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Ecdysone receptor and retinoid X receptor are key regulators in molting. Here, full length ecdysone receptor ( PcEcR ) and retinoid X receptor ( PcRXR ) cDNAs from Procambarus clarkii were cloned. Full length cDNA of PcEcR has 2500 bp, encoding 576 amino acid proteins, and full length cDNA of PcRXR has 2593 bp, in which a 15 bp and a 204 bp insert/deletion splice variant regions in DNA binding domain and hinge domain were identified. The two splice variant regions in PcRXR result four isoforms: PcRXR1 -4, encoding 525, 520, 457 and 452 amino acids respectively. PcEcR was highly expressed in the hepatopancreas and eyestalk and PcRXR was highly expressed in the eyestalk among eight examined tissues. Both PcEcR and PcRXR had induced expression after eyestalk ablation (ESA) in the three examined tissues. In muscle, PcEcR and PcRXR were upregulated after ESA, PcEcR reached the highest level on day 3 after ESA and increased 33.5-fold relative to day 0, and PcRXR reached highest the level on day 1 after ESA and increased 2.7-fold relative to day 0. In the hepatopancreas, PcEcR and PcRXR d EcR eased continuously after ESA, and the expression levels of PcEcR and PcRXR were only 0.7% and 1.7% on day 7 after ESA relative to day 0, respectively. In the ovaries, PcEcR was upregulated after ESA, reached the highest level on day 3 after ESA, increased 3.0-fold relative to day 0, and the expression level of PcRXR changed insignificantly after ESA ( p &gt; 0.05). The different responses of PcEcR and PcRXR after ESA indicates that different tissues play different roles (and coordinates their functions) in molting.

Cloning and Expression of Ecdysone Receptor and Retinoid X Receptor from Procambarus clarkii: Induction by Eyestalk Ablation