Transcriptional co-regulator (Co-regulator)

Transcriptional co-regulators are a vast class of proteins that modulate gene expression by interacting with DNA-binding transcription factors rather than binding DNA directly (Lonard & O'Malley, 2012; PubMed). They are broadly categorized into co-activators, which enhance transcription, and co-repressors, which inhibit it, often by recruiting chromatin-remodeling complexes (McKenna & O'Malley, 2002; UniProt). Many co-regulators possess intrinsic enzymatic activities, such as histone acetyltransferase (HAT) or histone deacetylase (HDAC) functions, which alter chromatin accessibility (Dasgupta et al., 2014; NIH). Dysregulation of these proteins, including overexpression or mutation, is a hallmark of various cancers, metabolic disorders, and inflammatory diseases (Lonard & O'Malley, 2012; StatPearls). Consequently, they have become attractive therapeutic targets, with drugs like HDAC inhibitors (e.g., Vorinostat) and BET bromodomain inhibitors currently in clinical use or development (PubChem; Wikipedia). Targeting co-regulators allows for the modulation of specific gene programs, although the broad nature of their regulatory roles can lead to significant systemic safety concerns such as hematologic toxicity (Dasgupta et al., 2014; PubMed).

Other names

Protein co-regulatorTranscriptional co-activatorTranscriptional co-repressorNuclear receptor co-regulatorCo-regulator

Inhibition of enzymatic activity (e.g., histone deacetylase inhibition) or disruption of protein-protein interactions (e.g., bromodomain inhibition) to modulate gene transcription.