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Most animals are oviparous. However, the genes regulating egg shell formation remain not very clear. In this study, we found that Nilaparvata lugens Forkhead box transcription factor L2 ( Nl FoxL2) directly activated follicle cell protein 3C ( NlFcp3C ) to regulate chorion formation. NlFoxL2 and NlFcp3C had a similar expression pattern, both highly expressed in the follicular cells of female adults. Knockdown of NlFoxL2 or NlFcp3C also resulted in the same phenotypes: obesity and female infertility. RNA interference (RNAi) results suggested that NlFcp3C is a downstream gene of NlFoxL2 Furthermore, transient expression showed that Nl FoxL2 could directly activate the NlFcp3C promoter. These results suggest that NlFcp3C is a direct target gene of Nl FoxL2. Depletion of NlFoxL2 or NlFcp3C prevented normal chorion formation. Our results first revealed the functions of Fcp3C and FoxL2 in regulation of oocyte maturation in an oviparous animal.

Forkhead box transcription factor L2 activates Fcp3C to regulate insect chorion formation