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首页> 外文期刊>Journal of Insect Physiology >Upregulation of two actin genes and redistribution of actin during diapause and cold stress in the northern house mosquito, Culex pipiens
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Upregulation of two actin genes and redistribution of actin during diapause and cold stress in the northern house mosquito, Culex pipiens

机译：北方房屋蚊（Culex pipiens）在滞育和冷应激期间两个肌动蛋白基因的上调和肌动蛋白的重新分布

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摘要

Two actin genes cloned from Culex pipiens L. are upregulated during adult diapause. Though actins 1 and 2 were expressed throughout diapause, both genes were most highly expressed early in diapause. These changes in gene expression were accompanied by a conspicuous redistribution of polymerized actin that was most pronounced in the midguts of diapausing mosquitoes that were exposed to low temperature. In nondiapausing mosquitoes reared at 25 degrees C and in diapausing mosquitoes reared at 18 degrees C, polymerized actin was clustered at high concentrations at the intersections of the muscle fibers that form the midgut musculature. When adults 7-10 days post-eclosion were exposed to low temperature (-5 degrees C for 12h), the polymerized actin was evenly distributed along the muscle fibers in both nondiapausing and diapausing mosquitoes. Exposure of older adults (1 month post-eclosion) to low temperature (-5 degrees C for 12h) elicited an even greater distribution of polymerized actin, an effect that was especially pronounced in diapausing mosquitoes. These changes in gene expression and actin distribution suggest a role for actins in enhancing survival of diapausing adults during the low temperatures of winter by fortification of the cytoskeleton.
机译：从成年滞育过程中克隆了从淡色库蚊（Culex pipiens L.）克隆的两个肌动蛋白基因。尽管肌动蛋白1和2在整个滞育期均表达，但两个基因在滞育期均表达最高。这些基因表达的变化伴随着聚合肌动蛋白的明显重新分布，这在暴露于低温的滞育蚊子的中肠中最为明显。在以25摄氏度饲养的非渗水蚊子和以18摄氏度饲养的滞育蚊子中，聚合的肌动蛋白以高浓度聚集在形成中肠肌肉组织的肌肉纤维交叉处。当成年后7-10天的成年人暴露于低温（-5摄氏度，持续12h）时，聚合的肌动蛋白在不停滞和滞育的蚊子中沿着肌纤维均匀分布。老年人（驱蚊后1个月）暴露于低温（-5摄氏度，持续12h）会引起聚合肌动蛋白的分布更大，这种效果在滞蚊中尤为明显。基因表达和肌动蛋白分布的这些变化表明肌动蛋白在冬季低温下通过细胞骨架的增强在滞育成年成年人的存活中发挥作用。

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