Structural Variation Analysis of Mutated Nannochloropsis oceanica Caused by Zeocin Through Genome Re-Sequencing  

作　　者：LIN Genmei ZHANG Zhongyi GUO Li DING Haiyan YANG Guanpin 

机构地区：[1]Laboratory of Marine Genetics and Breeding,Ocean University of China [2]College of Marine Life Sciences,Ocean University of China [3]Institutes of Evolution and Marine Biodiversity,Ocean University of China

出　　处：《Journal of Ocean University of China》2018年第5期1225-1230,共6页中国海洋大学学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(No.31270408);the National High Technology Research and Development Program(863 Program) of China(No.2014AA022001)

摘　　要：Zeocin can cause double strand breaks of DNA and thus may be employed as a mutagen. In this study, two strains of Nannochloropsis oceanica, the wild and the Zeocin-tolerant strains, were re-sequenced to verify such function of Zeocin, The results showed that Zeocin can mutate the N. oceanica genome and cause the structural variation. Zeocin either swept away or selected the alleles of genes functioning in ubiquitin-mediated proteolysis, alpha-linolenic acid metabolism, ascorbate and aldarate metabolism, ribosome biogenesis, and circadian rhythm, indicating that N. oceanica may have adjusted its metabolic performances for protein, carbohydrate, and lipid, and changed its ribosome biosynthesis and living rhythm to survive in Zeocin containing medium. In addition, Zeocin caused mutation may have influenced the expression of a set of tanscription factors. It was concluded that Zeocin effectively caused the structural variation of the genome of N. oceanica, and forced the microalgae to select out the alleles of a set of genes around these variations in order to adapt to Zeocin containing medium. Further studies on the genetic basis of the phenotypic adaptation of this haploid and asexual microalga and the application of Zeocin to its genetic improvement are very important.Zeocin can cause double strand breaks of DNA and thus may be employed as a mutagen.In this study,two strains of Nannochloropsis oceanica,the wild and the Zeocin-tolerant strains,were re-sequenced to verify such function of Zeocin.The results showed that Zeocin can mutate the N.oceanica genome and cause the structural variation.Zeocin either swept away or selected the alleles of genes functioning in ubiquitin-mediated proteolysis,alpha-linolenic acid metabolism,ascorbate and aldarate metabolism,ribosome biogenesis,and circadian rhythm,indicating that N.oceanica may have adjusted its metabolic performances for protein,carbohydrate,and lipid,and changed its ribosome biosynthesis and living rhythm to survive in Zeocin containing medium.In addition,Zeocin caused mutation may have influenced the expression of a set of transcription factors.It was concluded that Zeocin effectively caused the structural variation of the genome of N.oceanica,and forced the microalgae to select out the alleles of a set of genes around these variations in order to adapt to Zeocin containing medium.Further studies on the genetic basis of the phenotypic adaptation of this haploid and asexual microalga and the application of Zeocin to its genetic improvement are very important.

关 键 词：Nannochloropsis oceanica Zeocin MUTATION genome re-sequencing structural variation 

分 类 号：S917.4[农业科学—水产科学]