全球智库信息集成服务系统(G2TT): Egg size-dependent expression of growth hormone receptor accompanies compensatory growth in fish.

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来源类型	Article
规范类型	其他
DOI	10.1098/rspb.2011.1104
	Egg size-dependent expression of growth hormone receptor accompanies compensatory growth in fish.
	Segers FHID; Berishvili G; Taborsky B
发表日期	2012
出处	Proceedings of the Royal Society B: Biological Sciences 279 (1728): 592-600
出版年	2012
语种	英语
摘要	Large egg size usually boosts offspring survival, but mothers have to trade off egg size against egg number. Therefore, females often produce smaller eggs when environmental conditions for offspring are favourable, which is subsequently compensated for by accelerated juvenile growth. How this rapid growth is modulated on a molecular level is still unclear. As the somatotropic axis is a key regulator of early growth in vertebrates, we investigated the effect of egg size on three key genes belonging to this axis, at different ontogenetic stages in a mouthbrooding cichlid (Simochromis pleurospilus). The expression levels of one of them, the growth hormone receptor (GHR), were significantly higher in large than in small eggs, but remarkably, this pattern was reversed after hatching: young originating from small eggs had significantly higher GHR expression levels as yolk sac larvae and as juveniles. GHR expression in yolk sac larvae was positively correlated with juvenile growth rate and correspondingly fish originating from small eggs grew faster. This enabled them to catch up fully in size within eight weeks with conspecifics from larger eggs. This is the first evidence for a potential link between egg size, an important maternal effect, and offspring gene expression, which mediates an adaptive adjustment in a relevant hormonal axis.
主题	Evolution and Ecology (EEP)
关键词	Maternal effects Egg size Gene expression Compensatory growth
URL	http://pure.iiasa.ac.at/id/eprint/10036/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/129448
推荐引用方式 GB/T 7714	Segers FHID,Berishvili G,Taborsky B. Egg size-dependent expression of growth hormone receptor accompanies compensatory growth in fish.. 2012.