参考2015的文章:《ACTN4 and the pathways associated with cell motility and adhesion contribute to the process of lung cancer metastasis to the brain》
一个肺癌患者:A 47-year-old female patient ,取3个样品:
The adjacent benign lung tissue (N16),
the original lung cancer (T16),
the metastatic brain tumor (T30)
3个样品就是3个分组, 所以只能是走无重复的转录组差异分析流程,这里作者选择了 DEGseq ,参数很普通,就是:a fold change > 2, P < 0.5, and false discovery rate (FDR) < 0.05
more than900 differentially expressed genes between N16 and T16
more than 800 differentially expressed genes between N16 and T30
但是作者并没有对这两次的差异分析结果列表做韦恩图,反而是做了一个“骚操作”:
classify the differentially expressed genes in eight clusters based on the reads per kb per million reads (RPKM) change tendency of genes in these three types of tissues (N16, T16, and T30),
最后作者关注的是:Cluster 1: expression in N16 > expression in T16 = expression in T30
这个时候的算法来源比较老了,是:Cluster analysis of gene expression dynamics. Proc Natl Acad Sci U S A. 2002;
We thank Dr.Jianming Zeng(University of Macau), and all the members of his bioinformatics team, biotrainee, for generously sharing their experience and codes.