code: def relevant_transcripts(self, var_g):
          
          tx = self.hdp.get_tx_for_region(var_g.ac, self.alt_aln_method, var_g.posedit.pos.start.base,
                                          var_g.posedit.pos.end.base)
          return [e["tx_ac"] for e in tx]
docs: return list of transcripts accessions (strings) for given variant,
          selected by genomic overlap