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首页> 外文期刊>Journal of Fish Biology >Disentangling the role of MHC-dependent 'good genes' and 'compatible genes' in mate-choice decisions of three-spined sticklebacks Gasterosteus aculeatus under semi-natural conditions
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Disentangling the role of MHC-dependent 'good genes' and 'compatible genes' in mate-choice decisions of three-spined sticklebacks Gasterosteus aculeatus under semi-natural conditions

机译：弄清楚MHC依赖的“好基因”和“兼容基因”在半自然条件下三棘刺鱼Gasterosteus aculeatus的择偶决策中的作用

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摘要

To investigate and disentangle the role of major histocompatibility complex (MHC)-based 'good genes' and 'compatible genes' in mate choice, three-spined sticklebacks Gasterosteus aculeatus with specific MHC IIB genotypes were allowed to reproduce in an outdoor enclosure system. Here, fish were protected from predators but encountered their natural parasites. Mate choice for an intermediate genetic distance between parental MHC genotypes was observed, which would result in intermediate diversity in the offspring, but no mate choice based on good genes was found under the current semi-natural conditions. Investigation of immunological variables revealed that the less-specific innate immune system was more active in individuals with a genetically more divergent MHC allele repertoire. This suggests the need to compensate for an MHC-diminished T-cell repertoire and potentially explains the observed mate choice for intermediate MHC genetic distance. The present findings support a general pattern of mate choice for intermediate MHC diversity (i.e. compatible genes). In addition, the potentially dynamic role of MHC good genes in mate choice under different parasite pressures is discussed in the light of present and previous results.
机译：为了研究并弄清基于主要组织相容性复合体（MHC）的'好基因'和'兼容基因'在配偶选择中的作用，允许将具有特定MHC IIB基因型的三棘刺背G Gasterosteus aculeatus在室外封闭系统中繁殖。在这里，鱼类受到保护，免受捕食者侵袭，但遇到了自然寄生虫。观察到亲本MHC基因型之间的中间遗传距离的选择，这将导致后代之间的中间多样性，但在当前的半自然条件下，没有发现基于优良基因的选择。对免疫学变量的调查表明，具有MHC等位基因的遗传差异较大的个体，固有特异性较低的先天免疫系统更为活跃。这表明需要补偿MHC减少的T细胞库，并可能解释了中间MHC遗传距离的观察选择。本发现支持中等MHC多样性（即相容基因）的伴侣选择的一般模式。此外，根据当前和以前的结果，讨论了MHC优良基因在不同寄生虫压力下的配偶选择中的潜在动态作用。

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