Comparative transcriptomics uncovers alternative splicing and molecular marker development in radish (Raphanus sativus L.)

BMC Genomics

Research Article

Xianwen Zhu¹  Mingjia Tang²  Xiaobo Luo²  Liwang Liu²  Haiyan Jiang²  Yan Wang²  Yuelin Zhu²  Liang Xu²  Dongyi Liang²  Wei Zhang² 

[1] Department of Plant Sciences, North Dakota State University, 58108, Fargo, ND, USA;National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, 210095, Nanjing, People’s Republic of China;

关键词: Radish;    Transcriptome;    Alternative splicing (AS);    Single nucleotide polymorphism (SNP);    Insertion/deletion (InDel);    Genetic diversity;   

DOI  :  10.1186/s12864-017-3874-4

 received in 2017-01-06, accepted in 2017-06-20,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundAlternative splicing (AS) plays important roles in gene expression and proteome diversity. Single nucleotide polymorphism (SNP) and insertion/deletion (InDel) are abundant polymorphisms and co-dominant inheritance markers, which have been widely used in germplasm identification, genetic mapping and marker-assisted selection in plants. So far, however, little information is available on utilization of AS events and development of SNP and InDel markers from transcriptome in radish.ResultsIn this study, three radish transcriptome datasets were collected and aligned to the reference radish genome. A total of 56,530 AS events were identified from three radish genotypes with intron retention (IR) being the most frequent AS type, which accounted for 59.4% of the total expressed genes in radish. In all, 22,412 SNPs and 9436 InDels were identified with an average frequency of 1 SNP/17.9 kb and 1 InDel/42.5 kb, respectively. A total of 43,680 potential SSRs were identified in 31,604 assembled unigenes with a density of 1 SSR/2.5 kb. The ratio of SNPs with nonsynonymous/synonymous mutations was 1.05:1. Moreover, 35 SNPs and 200 InDels were randomly selected and validated by Sanger sequencing, 83.9% of the SNPs and 70% of the InDels exhibited polymorphism among these three genotypes. In addition, the 15 SNPs and 125 InDels were found to be unevenly distributed on 9 linkage groups. Furthermore, 40 informative InDel markers were successfully used for the genetic diversity analysis on 32 radish accessions.ConclusionsThese results would not only provide new insights into transcriptome complexity and AS regulation, but also furnish large amount of molecular marker resources for germplasm identification, genetic mapping and further genetic improvement of radish in breeding programs.

【 授权许可】

CC BY   
© The Author(s). 2017