Tier 2 — strong

Genetic impairments in folate enzymes increase dependence on dietary choline for phosphatidylcholine production at the expense of betaine synthesis

Ariel B Ganz, Kelsey Shields, Vlad G Fomin, Yusnier S Lopez, Sanjay Mohan, Jessica Lovesky, Jasmine C Chuang, Anita Ganti, Bradley Carrier, Jian Yan, Siraphat Taeswuan, Vanessa V Cohen, Camille C Swersky, Julie A Stover, Gerardo A Vitiello, Olga V Malysheva, Erika Mudrak, Marie A Caudill
FASEB journal : official publication of the Federation of American Societies for Experimental Biology 2016 30(10):3321-3333

Bibliography

PubMed
PMID 27342765
PubMed Central
PMC5024689
DOI
10.1096/fj.201500138RR
Funding
Indexed grant support: T32 DK007158 — NIDDK NIH HHS — United States. The indexed list may not contain the complete funding declaration.
Competing interests
A competing-interest declaration was not available in the indexed record or accessible disclosure metadata.

Study snapshot

DesignControlled feeding and genotype analysis
ModelHuman participants
SamplePregnant, lactating and nonpregnant women in a controlled feeding study
InterventionCholine 480 or 930 mg/day, including stable-isotope-labelled choline
DurationLong-term controlled feeding; timing varies by reproductive group
EndpointsCholine partitioning; Betaine synthesis; Genotype

What the study showed, in plain terms

Published in 2016, this source examined homocysteine, methylation and vascular function. Design: Controlled feeding and genotype analysis. Sample/model: Pregnant, lactating and nonpregnant women in a controlled feeding study. The exposure or intervention was Choline 480 or 930 mg/day, including stable-isotope-labelled choline. Follow-up or treatment period: Long-term controlled feeding; timing varies by reproductive group.

Folate-pathway variants altered the partitioning of choline toward phosphatidylcholine and away from betaine synthesis. Higher choline intake restored some partitioning patterns in selected genotype groups.

This was a choline intervention with exploratory genotype analyses, not a trial showing that MTHFR carriers require TMG supplements.

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Continue with TMG and Homocysteine: How Much Can Betaine Lower It?

Key findings

  • Folate-pathway variants altered the partitioning of choline toward phosphatidylcholine and away from betaine synthesis.
  • Higher choline intake restored some partitioning patterns in selected genotype groups.
  • The recorded outcome domains were Choline partitioning; Betaine synthesis; Genotype.
  • The result applies to the tested exposure: Choline 480 or 930 mg/day, including stable-isotope-labelled choline; Long-term controlled feeding; timing varies by reproductive group.

What this study can and cannot tell us

  • This was a choline intervention with exploratory genotype analyses, not a trial showing that MTHFR carriers require TMG supplements.
  • An individual controlled trial must be interpreted alongside its comparator, sample size, endpoint selection and independent replication. It does not validate a different commercial formulation or a general longevity claim.
  • Source basis: Indexed abstract and bibliographic data. Missing method details, funding information or participant denominators are not inferred.

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Editorial review

Reviewed by the Biohack Blueprint research team

Last verified

Dr. Khaled Mahmoud, MBBChCritical Care Medicine, Longevity Science & Editorial Direction Dr. Amr Yasser, PhDCardiometabolic, Musculoskeletal, Gut & Bioavailability Dr. Abdulla Mostafa, PhDCellular Senescence, Neurological, Mitochondrial & Brain-Ageing Biology