Selection on structural allelic variation biases plasticity estimates

Selection on structural allelic variation biases plasticity estimates
复制标题

结构等位基因变异的选择会影响可塑性估计

DOI:
10.1111/evo.13723
复制
发表时间:
2019
期刊:
影响因子:
3.3
通讯作者:
Althoff, David M.
Althoff, David M.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Santos, Mauro;Matos, Margarida;Wang, Sheng Pei;Althoff, David M.

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王和阿尔索夫(2019)探索了果蝇在新环境中表现出适应性可塑性的能力。在全同胞、半同胞设计中,他们对酒精脱氢酶(ADH)的活性和塑料反应进行了评分,测量的是乙醇浓度在0-10%(自然变化)和16%(新环境)范围内ADH活性的变化。ADH活性随酒精浓度的增加而增加,在新环境中幼虫存活率与ADH活性呈正相关。他们还报告说,表现出更大可塑性的家系在新环境中有更高的幼虫存活率,得出ADH可塑性是适应的结论。然而,这四位作者现在同意,由于这项研究使用全同胞家系从不同环境中的表型差异估计可塑性,因此不可能将AdhLocus等位基因频率变化的贡献与已知影响ADH活性的基因座的调控相分离。因此,等位基因频率的选择性变化可能会混淆对可塑性的估计;根据等位基因频率,可以推断出任何类型的“可塑性”(适应性、中性或非适应性)。在任何不能使用复制基因的可塑性研究中,应该考虑选择后对同胞群进行评分的问题。研究人员应该监测等位基因频率的变化,作为处理这一问题的一种机制。
Wang and Althoff (2019) explored the capacity ofDrosophila melanogasterto exhibit adaptive plasticity in a novel environment. In a full-sib, half-sib design, they scored the activity of the enzyme alcohol dehydrogenase (ADH) and plastic responses, measured as changes in ADH activity across ethanol concentrations in the range of 0–10% (natural variation) and 16% (the novel environment). ADH activity increased with alcohol concentration, and there was a positive association between larval viability and ADH activity in the novel environment. They also reported that families exhibiting greater plasticity had higher larval survival in the novel environment, concluding that ADH plasticity is adaptive. However, the four authors now concur that, since the study estimated plasticity from phenotypic differences across environments using full-sib families, it is not possible to disentangle the contributions of allele frequency changes at theAdhlocus from regulatory control at loci known to influence ADH activity. Selective changes in allele frequencies may thus conflate estimates of plasticity; any type of “plasticity” (adaptive, neutral, or maladaptive) could be inferred depending on allele frequencies. The problem of scoring sib-groups after selection should be considered in any plasticity study that cannot use replicated genotypes. Researchers should monitor changes in allele frequencies as one mechanism to deal with this issue.
通过调控基因控制表型可塑性
DOI: 10.1086/285543
发表时间: 1993
期刊: The American Naturalist
影响因子: --
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C. Schlichting;M. Pigliucci
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影响因子: --
作者:
S. Scheiner
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DOI: 10.1038/hdy.1985.118
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期刊: Heredity
影响因子: 3.8
作者:
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通讯作者: W. van Delden
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期刊: Genetics
影响因子: 3.3
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果蝇中 Adh 基因座产物之间的生化差异。
DOI: --
发表时间: 1980
期刊: Genetics
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