基于比较转录组的夏枯草组织差异表达分析

Comparative transcriptome analysis of differential expression in different tissues of Prunella vulgaris

目的分析夏枯草Prunella vulgaris果穗、茎、叶片转录组,挖掘夏枯草次生代谢产物生物合成的功能及调节基因。方法利用Illumina高通量测序技术对夏枯草不同组织进行转录组测序,并从差异表达的基因中鉴定次生代谢物生物合成的相关酶基因。结果在夏枯草的3个不同组织的转录本中,共有8 270个Unigenes在至少2个样品间差异显著。对不同组织差异表达的基因进行KEGG富集分析,结果表明,不同组织中苯丙素类生物合成的基因表达均有较大的变化。在夏枯草差异基因中分别搜索三萜类和酚酸类生物合成途径的关键酶,共鉴定到31个三萜类生物合成相关的Unigene,16个酚酸类生物合成相关的Unigenes,113个P450相关的Unigenes。结论本研究为后续发掘夏枯草次生物质代谢合成途径相关功能基因提供依据,也为夏枯草次生代谢物的生物合成调控研究奠定基础。

Objective To compare and analyze the transcriptome of ears, leaves and stems of Prunella vulgaris, and excavate the key enzyme genes related to the secondary metabolism biosynthesis of P. vulgaris. Methods The transcriptome of ears, leaves and stems of P. vulgaris were sequenced by Illumina high-throughput sequencing technology. Additionally biosynthesis related enzyme gene of secondary metabolism were identified from differentially expressed genes. Results In the transcripts of three different tissues of P. vulgaris, a total of 8 270 Unigenes differed significantly between at least two tissues. Kyoto Encyclopedia of Genes and Genomes(KEGG) enrichment analysis of genes differentially expressed in different tissues showed that the expression of phenylpropanoid biosynthesis genes varied greatly. A total of 31 triterpenoid biosynthesis-related Unigenes, 16 phenolic acid biosynthesis-related Unigenes, and 113 P450 s-related Unigenes were identified in the differentially expressed genes. Conclusion This study provides a basis for the subsequent discovery of functional genes related to the secondary metabolism synthesis pathway of P. vulgaris, and plays a foundation for the regulation of secondary metabolism biosynthesis of P. vulgaris.