Let's suppose hsa-miR-320 was found to be deferentially expressed in ESRD (end stage renal disease) - how can we predict its exact gene in the renal cortex?
Generally, the collected miRNA-target interactions are validated experimentally by reporter assay, western blot, microarray and next-generation sequencing experiments.
You may try miRecords (http://mirecords.biolead.org /) which includes 11 databases (DIANAmicroT, Microinspector, miRanda, MirTarget2, miTarget, NBmiRTar, PicTar, PITA, RNA22, RNAhybrid and TargetScan) for prediction.
Targets avialble in miRTarbase, dIANA tools, MirWalk are showed oly targeted gene, but they are not showing any organ specific gene, so is there any database which have data for target organ specific gene.