User-defined genomic DNA sequence

A user-defined genomic DNA sequence refers to a specific location within the genome selected for therapeutic intervention, typically through gene editing technologies (NIH, 2023). These sequences are targeted to correct deleterious mutations, knock out disease-causing genes, or insert functional genetic material into a precise locus. In the context of modern medicine, this target is defined by the researcher based on the underlying genetic cause of a disease, such as the HBB gene in sickle cell anemia (PubMed, PMID: 30545852). The biological function of the target sequence is to provide the template for transcription and regulation of cellular proteins. Therapeutic agents like CRISPR-Cas9 use guide RNAs to home in on these specific sequences, where they induce precise modifications like double-strand breaks or base changes (Science, 2012). While highly promising for treating previously incurable genetic conditions, targeting genomic DNA carries significant risks such as off-target effects (Nature Methods, 2015). Off-target effects occur when unintended parts of the genome are altered, potentially leading to oncogenesis or other cellular dysfunctions. Therefore, the specificity of the interaction between the drug and the user-defined sequence is the primary determinant of therapeutic safety and efficacy.

Other names

Target DNA sequenceGenomic locusTargeted genomic siteDNA target

Site-specific modification of the genome through double-strand breaks, base conversion, or epigenetic modulation to correct mutations or disrupt pathogenic genes.