Gene probes

Finding a specific gene in a haystack of DNA is what gene probes do: molecules tagged with radioisotopes, fluorescent dyes or enzymes so they latch onto matching sequences, allowing identification or isolation. Diagnostic kits use them to detect pathogens or GM traits in foods, and blotting techniques rely on probe hybridisation to reveal particular genes. The label choice balances sensitivity against safety and cost, with non-radioactive systems now standard in food testing laboratories. Validation confirms each probe binds only its intended target before routine use.