方法学前半部分
sample collection
6个配对sample:化疗前VS 化疗后
RNA extraction
1.细胞提取/溶解
2.提取RNA:RNeasy Kit
library construction and sequencing
1.RNA QC:2100 Bioanalyzer( RNA Integrity Number (RIN) ≥8)
2.RNA定量: NanoDrop 2000
3.建库: TruSeq® RNA Library Prep Kit v2
4.测序:HiSeq 2500:2x150 bp PE
filtering
筛选三原则:
- reads with adaptor
2.N碱基占了5%以上的read
3.low-quality reads (低质量read定义:Phred Quality<19的bases占了15%以上)
DEGs
1.FPKM: 出去测序深度及基因长度的影响
2.false discovery rate ≤ 0.05 and fold change ≥ 2
比对和丰度评估
程序:tophat/ Cufflinks
参考:转录组和hg19基因组
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