DNA probes are single-stranded fragments of DNA, typically tens to hundreds of nucleotides long, engineered to hybridize with a complementary target sequence in a sample through Watson-Crick base pairing. A reporter group attached to the probe, historically a radioisotope and now more often a fluorophore, biotin, or…
DNA probes are single-stranded fragments of DNA, typically tens to hundreds of nucleotides long, engineered to hybridize with a complementary target sequence in a sample through Watson-Crick base pairing. A reporter group attached to the probe, historically a radioisotope and now more often a fluorophore, biotin, or enzyme conjugate, renders the bound duplex detectable, so that the presence, abundance, or chromosomal location of a specific sequence can be inferred. Probe specificity is governed by length, base composition, and hybridization stringency, parameters set through temperature and salt concentration to discriminate perfectly matched targets from near-matches. In practice, probes underpin Southern and northern blotting, fluorescence in situ hybridization, microarray analysis, and diagnostic assays, including detection of genetically modified organisms and capture of disease-associated nucleic acids. Related techniques extend the same hybridization principle to RNA targets such as microRNAs, where short complementary probes paired with microfluidic or digital amplification platforms enable sensitive quantification from complex biological matrices. Probe design must also account for secondary structure, self-complementarity, and off-target cross-hybridization, which can produce false signals. As reagents that translate sequence information into a measurable readout, DNA probes remain central to molecular diagnostics, gene-expression profiling, and the structural and functional study of genomes.
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