Huded Arun Kumar C, Jingade Pavankumar, Mishra Manoj Kumar
Plant Biotechnology Division, Unit of Central Coffee Research Institute, Coffee Board, Manasagangothri, Mysore, Karnataka India.
3 Biotech. 2018 Mar;8(3):183. doi: 10.1007/s13205-018-1209-z. Epub 2018 Mar 14.
Isolation of high-quality RNA from coffee is challenging because of high level of polysaccharides, polyphenols and other secondary metabolites. In the present study, a rapid and efficient RNA extraction protocol from different tissues of coffee was optimized. Sufficiently high quality and quantity (225.6-454.8 µg/g) of RNA was obtained by using the optimized protocol. The presence of two distinct bands of 28S rRNA and 18S rRNA in agarose gel proved the intactness of the RNA samples. The average spectrophotometric values of the isolated RNA ranged from 1.96 to 2.02 () and 1.95 to 2.14 (), indicating the high quality of RNA devoid of polyphenols, polysaccharides and protein contamination. In the optimized protocol, addition of PVPP to the extraction buffer and a brief incubation of samples at 65 °C and subsequent purification with potassium acetate resulted in good-quality RNA isolation. The suitability of RNA for downstream processing was confirmed by PCR amplification with cytochrome c oxidase gene-specific primers. The amplification of a single 392 bp fragment using cDNA and 1.5 kb fragment using genomic DNA samples confirmed the absence of DNA contamination. The present protocol is rapid and yielded good quality and quantity of RNA suitable for functional genomics studies.
由于咖啡中多糖、多酚和其他次生代谢物含量较高,从咖啡中分离高质量RNA具有挑战性。在本研究中,优化了一种从咖啡不同组织中快速高效提取RNA的方法。使用优化后的方法获得了足够高质量和数量(225.6 - 454.8 µg/g)的RNA。琼脂糖凝胶中出现的两条清晰的28S rRNA和18S rRNA条带证明了RNA样品的完整性。分离得到的RNA的平均分光光度值在1.96至2.02()和1.95至2.14()之间,表明RNA质量高,不含多酚、多糖和蛋白质污染。在优化后的方法中,向提取缓冲液中添加聚乙烯聚吡咯烷酮(PVPP),样品在65°C短暂孵育,随后用醋酸钾纯化,从而实现了高质量RNA的分离。通过使用细胞色素c氧化酶基因特异性引物进行PCR扩增,证实了RNA适用于下游处理。使用cDNA扩增出单一的392 bp片段,使用基因组DNA样品扩增出1.5 kb片段,证实不存在DNA污染。本方法快速,能产生适合功能基因组学研究的高质量和数量的RNA。