A bacterial route for folic acid supplementation

Area of Science:

• Microbiology
• Nutritional Science
• Developmental Biology

Background:

• Folic acid is a synthetic folate used in food fortification to prevent deficiencies.
• Its metabolism and uptake differ from natural folates, and interactions with gut bacteria are understudied.
• The Caenorhabditis elegans - Escherichia coli model was used to investigate bacterial folic acid uptake routes.

Purpose of the Study:

• To examine the potential for a bacterial route in folic acid uptake and its impact on host health.
• To understand the role of gut bacteria, specifically E. coli, in processing supplemented folic acid.
• To investigate the implications of bacterial folate synthesis modulation on host longevity.

Main Methods:

• Utilized a C. elegans - E. coli animal-microbe model to study folic acid supplementation.
• Assessed the dependence of folic acid's effectiveness on the E. coli gene abgT.
• Quantified para-aminobenzoate-glutamate (PABA-glu) in folic acid preparations.
• Examined the impact of bacterial folate synthesis on C. elegans lifespan.

Main Results:

• Folic acid supplementation rescued a folate-deficient C. elegans mutant, but required higher concentrations than reduced folates.
• Effectiveness of folic acid was dependent on E. coli's abgT gene, indicating a bacterial uptake pathway.
• Folic acid preparations contained up to 4% PABA-glu, which E. coli utilizes for folate synthesis.
• Inhibition of bacterial folate synthesis, influenced by folic acid, extended C. elegans lifespan.

Conclusions:

• Folic acid supplementation in C. elegans is largely indirect, mediated by bacterial breakdown product uptake via E. coli AbgT.
• This bacterial pathway influences C. elegans development and longevity.
• Further research into folic acid's effects on human gut bacterial folate synthesis is crucial for assessing supplementation safety.