I did deep sequencing and now interested to make a network between miRNAs influencing other miRNAs/mRNA (genes) belonging to different pathways and GOs (gene ontologies). Can anybody suggest any free software/online tool?
I'd second Pratik on using TargetScan to predict target protein-coding genes first. From there you can build a network based on literature using CytoScape or IPA or other tools. It would help if you also have mRNA-Seq data from same samples, that way you can find high-confidence target genes that show tight correlation with your miRNAs. The network built on integrated miRNA-mRNA data will also be more reliable.
I. S. Vlachos, N. Kostoulas, T. Vergoulis, G. Georgakilas, M. Reczko, M. Maragkakis, M. D. Paraskevopoulou, K. Prionidis, T. Dalamagas, A. G. Hatzigeorgiou DIANA miRPath v.2.0: investigating the combinatorial effect of microRNAs in pathways Nucleic Acids Research 2012 (Web server issue)
For miRNA:mRNA interactions, we have developed microrna body map a couple of years ago (see paper). This resource has now been upgraded to decodeRNA which will be online soon.
Article The microRNA body map: Dissecting microRNA function through ...