猪笼草蚊（Wyeomyia smithii）中昼夜节律基因timeless表达的地理和发育变异

Geographic and developmental variation in expression of the circadian rhythm gene, timeless, in the pitcher-plant mosquito, Wyeomyia smithii.

作者信息

Mathias D, Jacky L, Bradshaw W E, Holzapfel C M

机构信息

Center for Ecology and Evolutionary Biology, University of Oregon, Eugene, OR 97403-5289, USA.

出版信息

J Insect Physiol. 2005 Jun;51(6):661-7. doi: 10.1016/j.jinsphys.2005.03.011.

DOI:10.1016/j.jinsphys.2005.03.011

PMID:15979087

Abstract

Expression of the circadian rhythm gene timeless was investigated in the pitcher-plant mosquito, Wyeomyia smithii (Coq.), and was found to vary with time of day, instar of diapause, and latitude of origin. The temporal pattern of timeless expression differed between the two diapausing instars and was significantly higher in southern (38-40 degrees N) than in northern (50 degrees N) populations, when diapausing instar was held constant. Expression of timeless is therefore both developmentally and evolutionarily variable. This result provides the first example of a latitudinal difference in the expression of timeless, suggesting that, along with evidence from other insects, timeless has the potential to affect photoperiodic response and its adaptive evolution in temperate seasonal environments.

摘要

对瓶草蚊（Wyeomyia smithii (Coq.)）体内昼夜节律基因timeless的表达进行了研究，发现其表达随时间、滞育龄期和起源地纬度而变化。两种滞育龄期的timeless表达时间模式不同，当滞育龄期保持不变时，南部（北纬38 - 40度）种群的timeless表达明显高于北部（北纬50度）种群。因此，timeless的表达在发育和进化上都是可变的。这一结果首次例证了timeless表达存在纬度差异，表明与其他昆虫的证据一起，timeless有可能影响光周期反应及其在温带季节性环境中的适应性进化。