Abstract
Bidirectional promoters are the transcription regulatory regions of genes positioned head-to-head on opposite strands. Specific sequence signals, chromatin modifications and three-dimensional structures of the transcription site facilitate the unconventional yet tightly regulated transcription proceeding in both directions from these promoters. Mutations or aberrant epigenetic changes can lead to abnormal enhanced or reduced expression from either of the bidirectionally transcribed genes resulting in tumorigenesis. Moreover, bidirectionally transcribed genes might also contribute towards the immune regulation in tumor microenvironment. In this review, we aimed to expound the characteristic features of bidirectional promoters alongside their transcriptional regulations, and ultimately, the association of these enigmatic genomic elements in different cancers.
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