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Chitin deacetylases (CDAs) are enzymes that catalyze the conversion of chitin into chitosan, thereby influence the mechanical and permeability properties of structures such as the cuticle and peritrophic matrices. The full length cDNAs of chitin deacetylase2 (CDA2) genes from Hyphantria cunea were fully cloned by PCR amplification. Two cDNA sequences of HcCDA2 were searched from transcriptome of H. cunea and named as HcCDA2a and HcCDA2b. The deduced protein sequences showed that HaCDA2a and HaCDA2b are synthesized as preproteins of 524 and 518 amino acid residues with an 18-amino acid signal peptide, respectively. HcCDA2a and HcCDA2b contained a chitin-binding domain (ChBD), a low-density lipoprotein receptor class A domain (LDLa) and a polysaccharide deacetylase-like catalytic domain (CDA). Gene expression analyses results showed that HcCDA2a and HcCDA2b were both expressed at the head, integument, foregut, midgut, hindgut, Malpighian tubules and fat body, as well as the 1st to 5th days of fifth instar larvae. Western blot analyses revealed that HcCDA2 protein was highly abundant in the head and integument, and the developmental expression result in the fifth instars showed that HcCDA2 was highly present at the first two days. Besides, RT-PCR results showed that HcCDA2a and HcCDA2b were both expressed in integument and head, whether in molting stage or feeding stage. No visiable phenotypic changes were observed after injection of dsHcCDA2b, while lethal phenotypes of cuticle shedding failure and high mortality were resulted from injection of dsHcCDA2a. The silence of HcCDA2a leads to the ecdysis failure and death of H. cunea. These results suggest that HcCDA2 plays an important role during insect development, and provide new candidate targets and basis for developing environment-friendly pesticides.
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