Folate deficiency causes uracil misincorporation into human DNA and chromosome breakage: implications for cancer and neuronal damage.
Level 5 - mechanism / opinion, no new human data
Mechanistic/bench research examining biochemical pathways and cellular DNA damage markers
PubMed 9096386 · doi:10.1073/pnas.94.7.3290
What was done
Investigated the mechanistic impact of folate deficiency on uracil misincorporation into human DNA, repair-associated nicking, and chromosome breaks (assessed by micronucleus frequency), as well as the reversibility of these alterations following folate administration.
What was found
Folate deficiency resulted in massive uracil incorporation into human DNA (approximately 4 million uracil molecules per cell) and chromosome breaks. Both elevated DNA uracil content and increased micronucleus frequency were reversed upon folate administration.
Why it matters
Provides a direct biochemical and cytogenetic mechanism linking low folate intake to genomic instability, offering a biological rationale for how folate deficiency may elevate risks of malignancy and neurological dysfunction.
Limits
The abstract lacks details on sample size, study population demographics, specific experimental models (in vitro cell lines versus human in vivo testing), dosages, time courses, and statistical variance estimates.
Cited by
- supports Folate deficiency causes DNA double-strand breaks that can lead to cancer-causing mutations.