Effects of BmKIT3R Gene Transfer on Pupal Development of Bombyx mori Linnaeus Using a Gal4/UAS Binary Transgenic System

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• 作者：Hao-Kun Zhang ; Guang-Li Cao ; Xiao-Rong Zhang ; Xiao-Juan Wang ; Ren-Yu Xue ; Cheng-Liang Gong
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：March 28, 2012
• 年：2012
• 卷：60
• 期：12
• 页码：3173-3179
• 全文大小：310K
• 年卷期：v.60,no.12(March 28, 2012)
• ISSN：1520-5118

文摘

The pupal stage of the silkworm Bombyx mori Linnaeus lasts for approximately two weeks. However, prolongation of pupal duration would reduce the labor required to process and dry fresh cocoons. This study investigated the effects of BmKIT₃^R gene (from the Chinese scorpion Buthus martensii Karsch) transfer on the pupal development of B. mori using a Gal4/UAS binary transgenic system. Gal4 driven by a pupa-specific promoter BmWCP4 (from a B. mori wing-cuticle protein gene) or PDP (from a B. mori cocoonase gene), and BmKIT₃^R driven by a UAS cis-acting element were used to construct novel piggyBac-derived plasmids containing a neomycin-resistance gene (neo) controlled by the Bombyx mori nucleopolyhedrovirus (BmNPV) ie-1 (immediate-early gene) promoter and a green fluorescent protein gene (gfp) under the control of the B. mori actin 3 (A3) promoter. The vector was transferred into silkworm eggs by sperm-mediated gene transfer. Transgenic silkworms were produced after screening for neo and gfp genes, and gene transfer was verified by polymerase chain reaction and dot-blot hybridization. The larval development of the hybrid progeny of Gal4- and UAS-transgenic silkworms was similar to that of normal silkworms, but some pupae failed to metamorphose into moths, and the development of surviving pupae was arrested as a result of BmKIT₃^R expression. Moreover, Gal4 driven by the BmWCP4 promoter delayed pupal development more effectively than that driven by the PDP promoter in the Gal4/UAS binary transgenic system. Pupal durations of hybrid transgenic silkworm progeny with BmWCP4 and PDP promoters were approximately 5, 2, and 4 days longer, respectively, compared to corresponding normal silkworms, BmWCP4/Gal4, and UAS/BmKIT₃^R transgenic silkworms, respectively. These results suggest new avenues of research for prolonging the pupal duration of silkworms.

Keywords:

Bombyx mori Linnaeus; piggyBac; Gal4/UAS binary transgenic system; BmKIT₃^R; pupal stage