Folate deficiency causes uracil misincorporation into human DNA and chromosome breakage: implications for cancer and neuronal damage.

Proc Natl Acad Sci U S A 1997 Apr;94(7):3290-5

Department of Cell and Molecular Biology, University of California, Berkeley 94720, USA.

Folate deficiency causes massive incorporation of uracil into human DNA (4 million per cell) and chromosome breaks. The likely mechanism is the deficient methylation of dUMP to dTMP and subsequent incorporation of uracil into DNA by DNA polymerase. During repair of uracil in DNA, transient nicks are formed; two opposing nicks could lead to chromosome breaks. Both high DNA uracil levels and elevated micronucleus frequency (a measure of chromosome breaks) are reversed by folate administration. A significant proportion of the U.S. population has low folate levels, in the range associated with elevated uracil misincorporation and chromosome breaks. Such breaks could contribute to the increased risk of cancer and cognitive defects associated with folate deficiency in humans.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC20362PMC
http://dx.doi.org/10.1073/pnas.94.7.3290DOI Listing
April 1997
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