RNA Editing Sites Exist in Protein-coding Genes in the Chloroplast Genome of Cycas taitungensis

查看全文 作　　者：Haiyan Chen Likun Deng Yuan Jiang Ping Lu Jianing [1]Yu

机构地区：[1]College of Life Sciences, Shaanxi Normal University, Xi'an 710062, China

出　　处：《Journal of Integrative Plant Biology》索引2011年第53卷第12期,共10页

基　　金：supported by the Fundamental Research Fund for the Central Universities (Grant No. GK200902028) 摘　　要：RNA editing is a post-transcriptional process that results in modifications of ribonucleotides at specific locations.In land plants editing can occur in both mitochondria and chloroplasts and most commonly involves C-to-U changes,especially in seed plants.Using prediction and experimental determination,we investigated RNA editing in 40 protein-coding genes from the chloroplast genome of Cycas taitungensis.A total of 85 editing sites were identified in 25 transcripts.Comparison analysis of the published editotypes of these 25 transcripts in eight species showed that RNA editing events gradually disappear during plant evolution.The editing in the first and third codon position disappeared quicker than that in the second codon position.ndh genes have the highest editing frequency while serine and proline codons were more frequently edited than the codons of other amino acids.These results imply that retained RNA editing sites have imbalanced distribution in genes and most of them may function by changing protein structure or interaction.Mitochondrion protein-coding genes have three times the editing sites compared with chloroplast genes of Cycas,most likely due to slower evolution speed. 关键词：蛋白编码基因叶绿体基因组 RNA编辑台东苏铁线粒体蛋白质站点种子植物密码子

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RNA Editing Sites Exist in Protein-coding Genes in the Chloroplast Genome of Cycas taitungensis

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