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• W1967578419 endingPage "345" @default.
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• W1967578419 abstract "Birds seasonally switch from one life history state (LHS) to another to maximize their fitness. Accordingly, they exhibit distinct differences in their physiological and behavioral phenotypes between seasons. Possible molecular mechanisms underlying changes through the seasons have scarcely been examined in migratory birds. The present study measured key genes suggested to be involved in the metabolic regulation of 4 photoperiodically induced seasonal LHSs in a long-distance migratory songbird, the blackheaded bunting (Emberiza melanocephala). Buntings were held under short days (8 h light:16 h darkness, 8L:16D), during which they maintained the winter nonmigratory phenotype. Then they were exposed for several weeks to long days (13L:11D). Differences in the activity-rest pattern, body fattening and weight gain, testis size, organ (heart, intestine) weights, and blood glucose and triglyceride levels confirmed that buntings sequentially exhibited spring migration-linked premigratory, migratory, and postmigratory LHSs under long days. The mRNA levels of circadian genes involved in metabolism (Bmal1, Clock, Npas2, Rorα, and Rev-erbα) and of genes that encode for proteins/enzymes involved in the regulation of glucose (Sirt1, FoxO1, Glut1, and Pygl) and lipids (Hmg-CoA; Pparα, Pparγ; Fasn and Acaca) showed LHS-dependent changes in their light-dark expression patterns in the hypothalamus and liver. These initial results on genetic regulation of metabolism in a migratory species extend the idea that the transitions between LHSs in a seasonal species are accomplished by changes at multiple regulatory levels. Thus, these findings promise new insights into the mechanism(s) of adaptation to seasons in higher vertebrates." @default.
• W1967578419 created "2016-06-24" @default.
• W1967578419 creator A5003360991 @default.
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• W1967578419 date "2014-09-24" @default.
• W1967578419 modified "2023-10-16" @default.
• W1967578419 title "Annual Life History–Dependent Gene Expression in the Hypothalamus and Liver of a Migratory Songbird" @default.
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• W1967578419 doi "https://doi.org/10.1177/0748730414549766" @default.
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