Is there any sense in antisense editing?

A number of recent studies have hypothesized that sense-antisense RNA transcript pairs create dsRNA duplexes that undergo extensive A-to-I RNA editing. Here we studied human and mouse genomic antisense regions, and found that the editing level in these areas is negligible. This observation puts in question the scope of sense-antisense duplexes formation in-vivo, which is the basis for a number of proposed regulatory mechanisms.