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陆地棉、亚洲棉和雷蒙德氏棉基因组序列为研究棉属 A 基因组进化提供了重要线索。

Genome sequence of Gossypium herbaceum and genome updates of Gossypium arboreum and Gossypium hirsutum provide insights into cotton A-genome evolution.

机构信息

Institute for Advanced Studies, Wuhan University, Wuhan, China.

State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China.

出版信息

Nat Genet. 2020 May;52(5):516-524. doi: 10.1038/s41588-020-0607-4. Epub 2020 Apr 13.

DOI:10.1038/s41588-020-0607-4
PMID:32284579
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7203013/
Abstract

Upon assembling the first Gossypium herbaceum (A) genome and substantially improving the existing Gossypium arboreum (A) and Gossypium hirsutum ((AD)) genomes, we showed that all existing A-genomes may have originated from a common ancestor, referred to here as A, which was more phylogenetically related to A than A. Further, allotetraploid formation was shown to have preceded the speciation of A and A. Both A-genomes evolved independently, with no ancestor-progeny relationship. Gaussian probability density function analysis indicates that several long-terminal-repeat bursts that occurred from 5.7 million years ago to less than 0.61 million years ago contributed compellingly to A-genome size expansion, speciation and evolution. Abundant species-specific structural variations in genic regions changed the expression of many important genes, which may have led to fiber cell improvement in (AD). Our findings resolve existing controversial concepts surrounding A-genome origins and provide valuable genomic resources for cotton genetic improvement.

摘要

在组装第一个陆地棉（A）基因组并大幅改进现有的亚洲棉（A）和海岛棉（AD）基因组之后，我们表明，所有现有的 A 基因组可能都起源于一个共同的祖先，我们称之为 A，它与 A 的亲缘关系比 A 更密切。此外，还表明异源四倍体的形成先于 A 和 A 的物种形成。两个 A 基因组独立进化，没有祖先-后代关系。高斯概率密度函数分析表明，从 570 万年前到不到 61 万年前发生的几个长末端重复序列爆发，有力地促成了 A 基因组大小的扩张、物种形成和进化。丰富的种特异性基因区域结构变异改变了许多重要基因的表达，这可能导致 AD 中纤维细胞的改善。我们的研究结果解决了围绕 A 基因组起源的现有争议概念，并为棉花遗传改良提供了有价值的基因组资源。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b991/7203013/e30d3b37071b/41588_2020_607_Fig15_ESM.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b991/7203013/4d165938958f/41588_2020_607_Fig6_ESM.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b991/7203013/bcbe98c8a1af/41588_2020_607_Fig7_ESM.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b991/7203013/0b99d28bf95d/41588_2020_607_Fig8_ESM.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b991/7203013/5b0ddbed0bd5/41588_2020_607_Fig9_ESM.jpg
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