AT-rich DNA region

AT-rich DNA regions are segments of the genome with a high proportion of adenine and thymine bases. These regions are recognized as functionally significant, particularly as DNA unwinding elements at origins of replication in both prokaryotic and eukaryotic genomes, where local destabilization of the double helix facilitates the initiation of DNA replication[2]. AT-rich sequences are also commonly found at nucleosome-free regions, such as promoters, where they recruit chromatin remodelers and contribute to transcription regulation[3]. In eukaryotes, tissue-specific genes tend to be more AT-rich and are typically found in condensed chromatin, in contrast to gene-dense, GC-rich housekeeping regions[4]. While not a discrete molecular target like a protein or defined receptor, AT-rich DNA serves as a structural and regulatory element in DNA. It can form non-canonical DNA structures (e.g., cruciforms)[7], participate in protein-DNA interactions (such as with TATA-binding protein)[1], and modulate gene expression. Errors or instability in AT-rich regions can result in genomic instability, increasing susceptibility to diseases like cancer[4]. These regions do not function as a traditional therapeutic target (e.g., enzyme, receptor) but present important biological features critical for DNA replication, transcription, and genome architecture[2][3][7].

Other names

AT-rich DNAA/T-rich DNA sequenceDNA unwinding element (DUE)poly(dA:dT) tracts