Genomic DNA Locus (DNA Locus)

A genomic DNA locus refers to a specific, fixed position on a chromosome where a particular gene or genetic marker is located (National Human Genome Research Institute, 2024). In modern medicine, specific loci serve as the primary targets for gene-editing platforms such as CRISPR-Cas9, Zinc Finger Nucleases (ZFNs), and TALENs, which aim to modify the genetic code to treat disease (Nature Reviews Genetics, 2023). These technologies allow for the precise correction of pathogenic mutations, the disruption of harmful genes, or the targeted insertion of functional genetic material. For instance, the HBB gene locus is targeted by exagamglogene autotemcel to treat sickle cell disease by inducing fetal hemoglobin expression (FDA, 2023). While traditional pharmacotherapy typically targets proteins, locus-specific interventions operate at the level of the genome to provide potentially curative outcomes. However, targeting a genomic locus carries significant risks, including off-target cleavage and unintended permanent alterations to the host genome (PubMed, 2022).

Other names

Genetic locusGene locusChromosomal locusDNA sequence

Site-specific genomic modification via double-strand breaks, base editing, or DNA alkylation.