Analysis of the transcriptome of Isodon rubescens and key enzymes involved in terpenoid biosynthesis
2016
Su, Xiuhong | Li, Qinglei | Chen, Suiqing | Dong, Chengming | Hu, Yuansen | Yin, Lei | Yang, Jingfan
Isodon rubescens is an important medicinal plant in China that has been shown to reduce tumour growth due to the presence of the compound oridonin. In an effort to facilitate molecular research on oridonin biosynthesis, we reported the use of next generation massively parallel sequencing technologies and de novo transcriptome assembly to gain a comprehensive overview of I. rubescens transcriptome. In our study, a total of 50,934,276 clean reads, 101,640 transcripts and 44,626 unigenes were generated through de novo transcriptome assembly. A number of unigenes – 23,987, 10,263, 7359, 18,245, 17,683, 19,485, 9361 – were annotated in the National Center for Biotechnology Information (NCBI) non-redundant protein (Nr), NCBI nucleotide sequences (Nt), Kyoto Encyclopedia of Genes and Genomes (KEGG) Orthology (KO), Swiss-Prot, protein family (Pfam), gene ontology (GO), eukaryotic ortholog groups (KOG) databases, respectively. Furthermore, the annotated unigenes were functionally classified according to the GO, KOG and KEGG. Based on these results, candidate genes encoding enzymes involved in terpenoids backbone biosynthesis were detected. Our data provided the most comprehensive sequence resource available for the study on I. rubescens, as well as demonstrated the effective use of Illumina sequencing and de novo transcriptome assembly on a species lacking genomic information.
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