Transcription Factor Identification Of Mirna Microarray Data

Question

[khan]

Hi everyone,

I have created heatmap of miRNA microarray expression data . I want to find the transcription factors for the over-expressed and under-expressed rejoins of heatmap. does anybody have idea, how to find TF for specific sets of genes in microarray ? is there any R package for this purpose ? or is there any tools for creating hierarchical model of TF regulation of genes ?