Check this out.... The UCSC Genome Browser. Nice visual way to look at all sorts of data associated with any locus. Here is the human PHEX locus showing refseq annotated transcripts, H3K27Ac marks, DNAse sensitivity and ENCODE transcription factor chip results. You can display/hide many more things as well. This is a good place to start looking a what sort of regulatory elements may be controlling the expression of your favorite mRNA.