Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA.
Department of Neuroscience, University of Arizona, Tucson, AZ, USA.
J Evol Biol. 2021 Aug;34(8):1333-1339. doi: 10.1111/jeb.13884. Epub 2021 Jun 25.
Understanding the mechanisms that underlie chromosome evolution could provide insights into the processes underpinning the origin, persistence and evolutionary tempo of lineages. Here, we present the first database of chromosome counts for animals (the Animal Chromosome Count database, ACC) summarizing chromosome numbers for ~15,000 species. We found remarkable a similarity in the distribution of chromosome counts between animals and flowering plants. Nevertheless, the similarity in the distribution of chromosome numbers between animals and plants is likely to be explained by different drivers. For instance, we found that while animals and flowering plants exhibit similar frequencies of speciation-related changes in chromosome number, plant speciation is more often related to changes in ploidy. By leveraging the largest data set of chromosome counts for animals, we describe a previously undocumented pattern across the Tree of Life-animals and flowering plants show remarkably similar distributions of haploid chromosome numbers.
了解染色体进化的机制可以深入了解谱系起源、持续存在和进化速度的过程。在这里，我们呈现了第一个动物染色体计数数据库（动物染色体计数数据库，ACC），总结了约 15000 个物种的染色体数量。我们发现动物和开花植物之间的染色体计数分布存在显著的相似性。然而，动物和植物之间的染色体数量分布的相似性可能是由不同的驱动因素造成的。例如，我们发现虽然动物和开花植物在与物种形成相关的染色体数量变化方面表现出相似的频率，但植物的物种形成更常与倍性变化有关。通过利用最大的动物染色体计数数据集，我们描述了一个以前未被记录的跨生命之树的模式——动物和开花植物的单倍体染色体数量分布惊人地相似。
