Abstract
We isolated and characterized two members of the α-crystallin/sHsp family, SnoHsp19.5 and SnoHsp20.8 from Sesamia nonagrioides (Lepidoptera: Noctuidae). The cDNAs encoded proteins of 174 and 185 amino acids, with calculated molecular weights of 19.5 and 20.8 kDa, respectively. The deduced amino acid sequences of SnoHsp19.5 and SnoHsp20.8 showed highest homology to Hsp19.7 of Mamestra brassicae and to Bombyx mori Hsp20.4, respectively. Expression patterns of SnoHsp19.5 and SnoHsp20.8 in non-diapausing individuals under different environmental conditions (heat or cold) showed different accumulation profiles for the two genes after heat and cold treatment. SnoHsp19.5 was consistently expressed, while SnoHsp20.8 gene was down-regulated in deep diapause and was up-regulated at the termination of diapause. Our results suggest that these two genes play distinctive roles in the regulation of diapause.
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