Common Questions About Dna Food Testing Answered

It’s critical (for legal, ethical, religious, and health reasons) to know what kinds of animals a food product comprises. The species composition and authenticity or adulteration can be discovered using a microarray test that detects DNA sequences. Continue reading to learn more about DNA food testing.

Why is DNA food testing necessary?

Deoxyribonucleic acid, or DNA, is the unique genetic material in every cell and is present in plants and animals, including the food we eat. DNA food testing has become a helpful tool to evaluate the food chain’s integrity, safety, and quality, thanks to developments in molecular biology.

It has many uses, including the detection of allergenic material, the detection of adulteration (such as the replacement of species as a result of commercial fraud), and the identification of bacteria that cause food-borne illnesses. Additionally, it can be utilized for supply chain traceability needs.

What kind of testing is done?

Three techniques are available: RFLP (Restriction Fragment Length Polymorphisms), DNA barcoding, and Polymerase Chain Reaction [PCR] sequencing are three examples of molecular techniques.

The most popular technique, polymerase chain reaction (PCR), entails removing DNA from the food and amplifying particular DNA fragments using an enzyme procedure. Agarose gel electrophoresis is used to divide the fragments into sizes that differ to identify the amplified DNA fragments.

The first DNA profiling method practical for wider use was RFLP analysis. In RFLP analysis, restriction enzymes—enzymes that can detect specific DNA base sequences and cut the DNA at those sites—(the restriction site) break the DNA sample into fragments. The resulting restriction fragments are segregated based on their sizes using gel electrophoresis.

DNA barcoding is a molecular method that analyzes a brief genetic identifier found in each organism’s DNA, known as the “DNA barcode.” It is possible to determine which species an organism belongs to by comparing its DNA barcode to a database of other barcodes.

The technique’s effectiveness depends on both the availability of high-quality reference sequence repositories and the molecular diversity of species (i.e., DNA sequences of known species).

Do food DNA tests have any limitations?

Crossover contamination

Contaminants amplified up to a billion times their initial concentration during PCR can affect the procedure’s outcome. In the absence of good laboratory practices, such contamination could happen in the lab or the food supply (e.g., crossover contamination between two animals slaughtered in the same facilities or carried in the same vehicle).

Integrity loss in the DNA

Altered or broken DNA can hurt the accuracy of DNA testing methods, which depend on high-quality DNA to function correctly. Because of physical forces during processing, DNA can be harmed or destroyed by heating, boiling, UV radiation, etc.

Hybridization

Genetic hybridization, such as that caused by crossbreeding, can result in multiple species or breeds having the same DNA profile. In these situations, DNA testing might not distinguish between breeds, making it challenging to trace some meat products through the food chain.

Final take

Researchers, food industry professionals, and regulatory agencies can use DNA testing in various situations. The latter might evaluate the authenticity and safety of foods using this technology and find any violations of labeling laws.