In probe-based Target Enrichment, complementary probes recognize matching DNA or RNA sequences within a complex sample. Hybridization creates a sequence-selective association, after which target-associated material can be captured and separated from unwanted molecules. This selectivity increases the fraction of informative sequences available for downstream sequencing, focusing analysis on predefined genomic regions.
Probe capture and primer-based amplification enrich targets through different molecular routes. Hybridization uses complementary probes to associate selected sequences with capture material, whereas sequence-specific primers direct amplification of the regions they match. Both approaches increase target representation, but they do so through selection and separation in the first case and targeted copying in the second.
Selectivity matters because a complex sample contains many molecules outside the regions under investigation. Removing unwanted material through probe capture or emphasizing matched sequences through primer-based amplification increases the relative representation of informative molecules. The resulting sequencing effort is concentrated on chosen regions instead of being distributed across unrelated genomic content.
A basic probe-capture workflow brings complementary probes into contact with DNA or RNA from a complex sample, allowing target sequences to hybridize. The associated target material is then captured and separated from unwanted molecules. The enriched fraction can subsequently undergo sequencing, so the resulting data emphasize genomic regions selected at the beginning of the workflow.
Target enrichment is useful when the biological question concerns a defined set of sequences rather than the entire genome. Supported applications include variant detection, gene panel analysis, and pathogen identification. It can also focus experiments on genomic regions with clinical or biological importance, directing sequencing resources toward information most relevant to the study.
For a study centered on defined genomic regions, Target Enrichment directs sequencing toward selected sequences rather than surveying the entire genome. This focus can improve coverage while reducing sequencing cost and data-processing demands. Whole-genome analysis is broader in scope, whereas enrichment prioritizes detailed analysis of specified regions considered informative for the investigation.