Domestication of rice has reduced the occurrence of transposable elements within gene coding regions

BMC Genomics

Research Article

Staffan Persson¹  Kai Guo²  Xukai Li³  Lingqiang Wang³  Yanting Wang³  Xiaobo Zhu³  Peng Chen³  Liangcai Peng³  Guosheng Xie³  Ying Li³ 

[1] Biomass and Bioenergy Research Centre, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;School of Biosciences, University of Melbourne, 3010, Melbourne, VIC, Australia;Biomass and Bioenergy Research Centre, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;College of Life Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;Biomass and Bioenergy Research Centre, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei, People’s Republic of China;

关键词: Oryza;    Transposable elements;    Cultivated rice;    Wild rice;    Evolution;   

DOI  :  10.1186/s12864-016-3454-z

 received in 2016-09-15, accepted in 2016-12-22,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundTransposable elements (TEs) are prominent features in many plant genomes, and patterns of TEs in closely related rice species are thus proposed as an ideal model to study TEs roles in the context of plant genome evolution. As TEs may contribute to improved rice growth and grain quality, it is of pivotal significance for worldwide food security and biomass production.ResultsWe analyzed three cultivated rice species and their closest five wild relatives for distribution and content of TEs in their genomes. Despite that the three cultivar rice species contained similar copies and more total TEs, their genomes contained much longer TEs as compared to their wild relatives. Notably, TEs were largely depleted from genomic regions that corresponded to genes in the cultivated species, while this was not the case for their wild relatives. Gene ontology and gene homology analyses revealed that while certain genes contained TEs in all the wild species, the closest homologs in the cultivated species were devoid of them. This distribution of TEs is surprising as the cultivated species are more distantly related to each other as compared to their closest wild relative. Hence, cultivated rice species have more similar TE distributions among their genes as compared to their closest wild relatives. We, furthermore, exemplify how genes that are conferring important rice traits can be regulated by TE associations.ConclusionsThis study demonstrate that the cultivation of rice has led to distinct genomic distribution of TEs, and that certain rice traits are closely associated with TE distribution patterns. Hence, the results provide means to better understand TE-dependent rice traits and the potential to genetically engineer rice for better performance.

【 授权许可】

CC BY   
© The Author(s). 2017