老鸦瓣实时定量PCR内参基因的筛选和验证

药用植物老鸦瓣供需矛盾日益凸显,但分子生物学方面研究基础还较薄弱。为开展老鸦瓣相关功能基因表达量的分析检测,需要选择适宜的内参基因以提高实验结果准确性。从老鸦瓣转录组数据中筛选出8个候选内参基因(ACT,TUA,CYP,GAPDH,UBQ,UBI,EF1α,UBC),利用实时荧光定量技术检测候选内参基因在老鸦瓣鳞茎、叶、花以及芽茎不同发育阶段中的表达水平。应用GeNorm,NormFinder和BestKeeper软件以及RefFinder网站综合评估内参基因稳定性。结果表明8个候选内参基因中UBC的Ct变化范围最小,表达水平最稳定,适合作为内参基因;GeNorm和NormFinder软件分析结果显示UBC和UBI的稳定性相对较好;BestKeeper评估CYP和UBC表达较稳定;RefFinder网站综合排序稳定性最好的基因为UBC和UBI,而ACT在所有软件评估中稳定性最差。分别以稳定性最好的UBC,UBI和最差的ACT为内参基因检测老鸦瓣GBSS基因的表达,GBSS基因在UBC和UBI校正下表达模式相同,以ACT为内参时表达趋势有较大差异,进一步验证了筛选结果的可靠性,表明UBC和UBI均适合作为老鸦瓣不同器官和芽茎不同发育时期基因表达研究的内参基因。该研究筛选得到的稳定内参基因UBC和UBI为后续开展老鸦瓣中关键基因表达分析研究奠定了基础。

Selection and validation of reference genes for quantitative Real-time PCR analysis in Amana edulis

Amana edulis is a traditional Chinese medicinal plant with low propagation coefficient. In recent years, the increasing demands of A. edulis lead to a shortage of its wild resources. In order to analyze the expression of related functional genes in A. edulis, the selection of suitable internal reference genes is crucial to improve the accuracy of experimental results. Eight genes(ACT, TUA, CYP, GAPDH, UBQ, UBI, EF1a, UBC)were chosen as candidate reference genes based on the RNA-Seq. Real-time fluorescence quantitative technique was used to detect the expression level of candidate internal reference genes in different organs(bulb, leaf, flo-wer) and stolons at different development stages of A. edulis. Then GeNorm, NormFinder, BestKeeper softwares and RefFinder website were used for a comprehensive analysis of the expression stability of the candidate genes.The results showed that among the 8 candidate reference genes, the variation range of Ct value of UBC was the smallest, and the expression level was stable, which was suitable for an reference gene. GeNorm and NormFinder software analysis showed that UBC and UBI were the optimal reference genes. BestKeeper analysis showed that CYP and UBC expression were relatively stable. Comprehensive evaluation of RefFinder website showed that UBC and UBI were the most stable genes, and ACT displayed the lowest stability in all software evaluation, indicating UBC and UBI were suitable for reference genes. Additionally, the most stable UBC, UBI and the most unstable ACT were used as internal reference genes to detect the expression of GBSS gene in A. edulis, and expression pattern of GBSS gene was the same under the calibration of UBC and UBI. The expression data of GBSS gene confirmed that UBC and UBI genes were reliable for A. edulis qRT-PCR as internal reference genes. The results would benefit future studies on related gene expression of A. edulis.