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为什么杀虫剂靶标基因中与抗性相关的突变如此之少?

Why are there so few resistance-associated mutations in insecticide target genes?

作者信息

ffrench-Constant R H, Pittendrigh B, Vaughan A, Anthony N

机构信息

Department of Entomology, University of Wisconsin-Madison 53706, USA.

出版信息

Philos Trans R Soc Lond B Biol Sci. 1998 Oct 29;353(1376):1685-93. doi: 10.1098/rstb.1998.0319.

Abstract

The genes encoding the three major targets of conventional insecticides are: Rdl, which encodes a gamma-aminobutyric acid receptor subunit (RDL); para, which encodes a voltage-gated sodium channel (PARA); and Ace, which encodes insect acetylcholinesterase (AChE). Interestingly, despite the complexity of the encoded receptors or enzymes, very few amino acid residues are replaced in different resistant insects: one within RDL, two within PARA and three or more within AChE. Here we examine the possible reasons underlying this extreme conservation by looking at the aspects of receptor and/or enzyme function that may constrain replacements to such a limited number of residues.

摘要

编码传统杀虫剂三大主要作用靶标的基因分别是

Rdl,编码γ-氨基丁酸受体亚基(RDL);para,编码电压门控钠通道(PARA);以及Ace,编码昆虫乙酰胆碱酯酶(AChE)。有趣的是,尽管所编码的受体或酶结构复杂,但在不同的抗性昆虫中只有极少的氨基酸残基发生了替换:RDL中有一个,PARA中有两个,AChE中有三个或更多。在此,我们通过研究受体和/或酶功能中可能将替换限制在如此少量残基的方面,来探究这种极端保守性背后的潜在原因。

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