DOI: 10.1073/pnas.94.7.3290. Folate deficiency causes uracil misincorporation into human DNA and chromosome breakage: Implications for cancer and neuronal damage

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

10.1073/pnas.94.7.3290

Crossref journal-article

Proceedings of the National Academy of Sciences

Proceedings of the National Academy of Sciences (341)

Abstract

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.

Bibliography

Blount, B. C., Mack, M. M., Wehr, C. M., MacGregor, J. T., Hiatt, R. A., Wang, G., Wickramasinghe, S. N., Everson, R. B., & Ames, B. N. (1997). Folate deficiency causes uracil misincorporation into human DNA and chromosome breakage: Implications for cancer andâneuronalâdamage. Proceedings of the National Academy of Sciences, 94(7), 3290â3295.

Authors 9

Benjamin C. Blount (first)
Matthew M. Mack (additional)
Carol M. Wehr (additional)
James T. MacGregor (additional)
Robert A. Hiatt (additional)
Gene Wang (additional)
Sunitha N. Wickramasinghe (additional)
Richard B. Everson (additional)
Bruce N. Ames (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 10:35 a.m.)
Deposited	3 years, 4 months ago (April 13, 2022, 3:24 p.m.)
Indexed	1 week, 1 day ago (Aug. 29, 2025, 6:48 a.m.)
Issued	28 years, 5 months ago (April 1, 1997)
Published	28 years, 5 months ago (April 1, 1997)
Published Online	28 years, 5 months ago (April 1, 1997)
Published Print	28 years, 5 months ago (April 1, 1997)

Funders 0

None

BibTeX

@article{Blount_1997, title={Folate deficiency causes uracil misincorporation into human DNA and chromosome breakage: Implications for cancer and neuronal damage}, volume={94}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.94.7.3290}, DOI={10.1073/pnas.94.7.3290}, number={7}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Blount, Benjamin C. and Mack, Matthew M. and Wehr, Carol M. and MacGregor, James T. and Hiatt, Robert A. and Wang, Gene and Wickramasinghe, Sunitha N. and Everson, Richard B. and Ames, Bruce N.}, year={1997}, month=apr, pages={3290–3295} }

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