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Adaptive evolution of the circadian gene timeout in insects

文献类型： 外文期刊

作者： Gu, Hai-Feng 1 ; Xiao, Jin-Hua 1 ; Niu, Li-Ming 3 ; Wang, Bo 1 ; Ma, Guang-Chang 3 ; Dunn, Derek W. 4 ; Huang, Da-Wei 1 ;

作者机构： 1.Chinese Acad Sci, Inst Zool, Key Lab Zool Systemat & Evolut, Beijing 100101, Peoples R China

2.Univ Chinese Acad Sci, Beijing, Peoples R China

3.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Danzhou 571737, Hainan, Peoples R China

4.Yunnan Univ Finance & Econ, Stat & Math Coll, Kunming 650221, Yunnan, Peoples R China

5.Shandong Agr Univ, Plant Protect Coll, Tai An 271018, Shandong, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2014 年 4 卷

页码：

收录情况： SCI

摘要： Most insects harbor two paralogous circadian genes, namely timeout and timeless. However, in the Hymenoptera only timeout is present. It remains unclear whether both genes, especially timeout in hymenopteran insects, have distinct evolutionary patterns. In this study, we examine the molecular evolution of both genes in 25 arthropod species, for which whole genome data are available, with addition of the daily expression of the timeout gene in a pollinating fig wasp, Ceratosolen solmsi (Hymenoptera: Chalcidoidea: Agaonidae). Timeless is under stronger purifying selection than timeout, and timeout has positively selected sites in insects, especially in the Hymenoptera. Within the Hymenoptera, the function of timeout may be conserved in bees and ants, but still evolving rapidly in some wasps such as the chalcids. In fig wasps, timeout is rhythmically expressed only in females when outside of the fig syconium but arrhythmically in male and female wasps inside the syconium. These plastic gene expressions reflect adaptive differences of males and females to their environment.

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