Non-PU.1-associated AT-rich DNA minor groove sites

Non-PU.1-associated AT-rich DNA minor groove sites refer to the vast array of genomic sequences composed of adenine and thymine (AT) base pairs that are not associated with the binding of the transcription factor PU.1 (SPI1) (Stephens et al., 2016). These sites possess a narrow minor groove architecture that serves as a high-affinity docking site for various small-molecule minor groove binders (MGBs), such as heterocyclic diamidines (Munde et al., 2014). In the development of targeted therapies for acute myeloid leukemia (AML) and other PU.1-dependent diseases, these sites are primarily characterized as off-targets rather than therapeutic targets (Poon, 2012). While drugs like DB1976 are designed to selectively bind the AT-rich tracks flanking the PU.1 consensus sequence (GGAA), they often retain some level of affinity for these non-specific genomic sites (Antony-Debré et al., 2017). Binding to non-PU.1-associated AT-rich sites can lead to the sequestration of the drug, reducing its therapeutic efficacy at intended regulatory elements, and may cause significant safety concerns, including systemic toxicity and the unintended disruption of other essential transcription factors that utilize AT-rich minor groove interactions (Stephens et al., 2016).

Other names

Genomic AT-rich minor groove sitesNon-specific AT-rich DNAOff-target AT-rich sitesNon-PU.1-bound AT-rich sitesGenomic AT-rich background

Minor groove binding and competitive displacement of DNA-binding proteins at non-specific genomic sites.