Drift drives the evolution of chromosome number I: The impact of trait transitions on genome evolution in Coleoptera.
Drift drives the evolution of chromosome number I: The impact of trait transitions on genome evolution in Coleoptera.
复制标题
漂移驱动 I 号染色体的进化：性状转变对鞘翅目基因组进化的影响。
DOI：
10.1093/jhered/esae001
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Demuth,JefferyP
中科院分区：
文献类型：
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作者：
Blackmon,Heath;Jonika,MichelleM;Alfieri,JamesM;Fardoun,Leen;Demuth,JefferyP
染色体突变，如融合和分裂，通常被认为是有害的，特别是在杂合子（欠显性），因此不太可能成为固定。然而，许多染色体物种形成的模型将重要作用归于染色体突变。当有效群体规模（Ne）较小时，选择的效力减弱，通过遗传漂变固定弱显性突变的可能性更大。因此，调节Ne的生态和表型转变可能促进染色体变化的固定，从而增加核型进化的速率。我们综合所有可用的染色体数目的数据，鞘翅目和估计的影响，预计改变霓虹灯的染色体组型进化的速度在家庭步甲和12个不同的分支，从整个鞘翅目。我们的分析表明，在步甲科，无翅分支有更快的染色体数目增加的速度。此外，我们的分析表明，表现出多个性状的分支，包括严格的近亲繁殖，寡食，无翅，和岛屿特有，具有很高的核型进化率。我们的研究结果表明，染色体数目的变化很可能是固定的遗传漂变，尽管初始健身成本和染色体物种形成模型可能是很重要的，考虑在非常小的Ne分支。
Chromosomal mutations such as fusions and fissions are often thought to be deleterious, especially in heterozygotes (underdominant), and consequently are unlikely to become fixed. Yet, many models of chromosomal speciation ascribe an important role to chromosomal mutations. When the effective population size (Ne) is small, the efficacy of selection is weakened, and the likelihood of fixing underdominant mutations by genetic drift is greater. Thus, it is possible that ecological and phenotypic transitions that modulateNefacilitate the fixation of chromosome changes, increasing the rate of karyotype evolution. We synthesize all available chromosome number data in Coleoptera and estimate the impact of traits expected to changeNeon the rate of karyotype evolution in the family Carabidae and 12 disparate clades from across Coleoptera. Our analysis indicates that in Carabidae, wingless clades have faster rates of chromosome number increase. Additionally, our analysis indicates clades exhibiting multiple traits expected to reduceNe, including strict inbreeding, oligophagy, winglessness, and island endemism, have high rates of karyotype evolution. Our results suggest that chromosome number changes are likely fixed by genetic drift despite an initial fitness cost and that chromosomal speciation models may be important to consider in clades with very smallNe.