Gene regulation by dietary microRNAs

Area of Science:

• Molecular Biology
• Genetics
• Nutritional Science

Background:

• MicroRNAs (miRNAs) are key regulators of gene silencing, traditionally viewed as endogenous molecules.
• Recent research suggests food-borne miRNAs are bioavailable and can impact gene expression in consumers.
• Evidence points to bovine and avian miRNAs from milk and eggs potentially regulating human genes.

Purpose of the Study:

• To review the evidence for the bioavailability and bioactivity of dietary microRNAs (miRNAs).
• To discuss the implications of food-borne miRNAs challenging the endogenous-only dogma.
• To highlight current research challenges and future directions in dietary miRNA research.

Main Methods:

• Literature review of studies investigating dietary miRNA bioavailability and effects.
• Analysis of bioinformatics predictions for bovine miRNA targets in human health.
• Discussion of experimental challenges, including miRNA knockout models and sequence similarity.

Main Results:

• Compelling evidence suggests humans utilize bovine miRNAs from milk and avian miRNAs from eggs for gene regulation.
• Mice on miRNA-depleted diets show inability to compensate via increased endogenous synthesis.
• Bioinformatics implicates dietary miRNAs in regulating genes crucial for human health and development.

Conclusions:

• Dietary miRNAs, particularly from milk, should be considered bioactive compounds in food.
• Further research is warranted to fully understand the role and impact of dietary miRNAs.
• Distinguishing exogenous from endogenous miRNAs remains a significant challenge in the field.