25. RNA-Seq用于mRNA编辑分析
Peng Z, Cheng Y, B, Kang L, Tian Z, et al. Nature
Biotechnology 2012, 30: 253–262.
Ramaswami G, Lin W, Piskol R, Tan
MH, Davis C, et al. Nat Methods
2012.
50. 参考序列:
基因组 and/or 转录组
Can I use ______ as a reference?
a different accession
a different species in same genus
a different species in same family
有无参考序列
使用Arabidopsis thaliana col. 作为参
考序列的reads mapping结果
52. How deep is deep enough?
对人B-cell的一项研究称:
精确测量所有表达转录本,需要~500M reads;精确测量绝大多数转
录本,需要~100M reads(SE50)。
对大肠杆菌的一项研究表明,上述两个值为50M 和10M(76-101 PE)。
不过由于尚未达成转录组分析的金标准,对具体数值的确定仍存在争议。
Toung JM, Morley M, Li M, Cheung VG. Genome Res. 2011 Jun;21(6):991-8
Haas et al. BMC Genomics 2012 13:734.
55. 随机化Randomization
materials & order(required by random variable(s))
重复Replication
error estimate & more accurate parameter
repeated measure differs from replication.
区组化Blocking(control(s)的推广)
Reduce or eliminate variation introduced by nuisance factors.
实验设计三大统计学原则
69. 必不可少的步骤
目前还没有关于分析金标准的一致看法,典型的分析流程至少包含以下
步骤:
mapping of the reads 【mismatch】
summarization of the reads per adopted gene model【multi-reads】
normalization【reads counts, FPKM, TPM,percellome】
testing for differential expression【GFOLD,edgeR,NOIseq】
eventually, system biological analysis(GO, pathway, network etc.)
RNA‐Seq is a general term to describe the process of high‐throughput sequencing of all messenger RNA (the ”transcriptome”) present in a specific condition.