柞蠶PTTH基因的克隆及表達(dá)分析
[Abstract]:Antheraea pernyi is a unique silk insect in China and an important model insect with pupae diapause. The development of diapause is suspended and the insect continues to grow and reproduce after diapause is released. The prothymic hormone of Antheraea pernyi is secreted by the brain, and the metamorphosis and development of Antheraea pernyi are controlled by stimulating the ecdysone of the prethymic gland to study the gene expression of prothymic hormone and its regulation to clarify the diapause mechanism of Antheraea pernyi. It also helps to regulate the living environment of tussah to control the occurrence and release of diapause and to realize the high and stable production of tussah. Based on the diapause pupae of Henan Province Antheraea pernyi cultivar "Yuda 1" and the 5th instar larva, pupae and adult of Liaoning Province, the (ApPTTH) gene of prothymic hormone was obtained by RT.PCR technique. The structure and function were predicted by bioinformatics analysis. The prokaryotic expression vector of ApPTTH was constructed by prokaryotic expression technique, and the expression of ApPTTH protein was induced successfully. Using semi-quantitative PCR technique, the expression profiles of ApPTTH in different larval tissues were analyzed by using the tissue of the 5th instar larva of "Shenhuang No. 2", a diploid Antheraea pernyi cultivar "Shenhuang No. 2". Diapause pupae of Antheraea pernyi were treated with 300 Lux illumination and 17 h light for 17 h, respectively. The expression of ApPTTH in brain tissue of diapause pupae of "Yuda 1" and "Shenhuang 2" diapause pupae was detected by real-time fluorescence quantitative PCR. The results were as follows. 1. Using TA cloning technique, the ORF length of ApPTTH cDNA of ApPTTH, was 666 bp, encoding 221 amino acids, the protein isoelectric point PI was 8.38, and the predicted protein length was about 25.96 kDa. The homology of PTTH amino acid sequence between tussah PTTH and other insects was more than 70%. The results of 2.RT-PCR showed that ApPTTH was expressed in the brain of early 5th instar larvae of tussah. The expression of ApPTTH was also detected in ovary tissues of early 5th instar larvae of tussah, but no expression of ApPTTH was detected in other tissues. During diapause, the expression of ApPTTH in pupae brain of tussah did not change much, but the expression of ApPTTH increased to the maximum when diapause was removed and pupae development was about to enter the adult. The expression of ApPTTH began to decrease after the adult development of tussah silkworm pupae was close to the emergence of adult, indicating that the expression of ApPTTH gene and the synthesis of ApPTTH played an important role in relieving diapause and adult development to emergence. 4. The cloned ApPTTH was linked to the expression vector pEASY (?)-Blunt E1 and transformed into the expressed protein of the strain BL21 (DE3). The antibody was prepared after purification. The protein extracted from pupa brain was detected by Western-blot and a coarse band appeared at about 30 kD. The size of the protein was the same as the predicted molecular weight of ApPTTH. The protein bound to the antibody was the PTTH protein of Antheraea pernyi (Antheraea pernyi). This study laid a foundation for further understanding the role of ApPTTH and its relationship with diapause.
【學(xué)位授予單位】:沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:S885.1;Q78
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