using mirbase? - (Mar/30/2010 )

Hi folks, Someone please help me how to identify the function of a specific miRNA after identifying it, using microarray.

thanks.

There are many possible strategies. Here is one. Use a Morpholino oligo complementary to your pri-miRNA of interest (ideally a 25-mer spanning the guide sequence and extending slightly into the loop). Introduce the oligo into the cytosol of the cells, embryos or organism you wish to test. Wait a few days and harvest RNA from treated cells/embryos/organisms and untreated control cells/embryos/organisms, comparing the RNA from the treated and untreated cells/embryos/organism on microarrays.

For a specificity control, you might use a Morpholino targeting the guide strand and extending a bit into the loop. This may take longer to show an effect, as it will not bind to guide miRNA already on RISC. However, it should strand-invade the pri-miRNA and prevent cleavage by Dicer, so the pri-miRNA won't mature.