Human polymorphic variants of the NEIL1 DNA glycosylase

Laura M. Roy, Pawel Jaruga, Thomas Wood, Amanda K. McCullough, Miral Dizdaroglu, R. Stephen Lloyd

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Abstract

In mammalian cells, the repair of DNA bases that have been damaged by reactive oxygen species is primarily initiated by a series of DNA glycosylases that include OGG1, NTH1, NEIL1, and NEIL2. To explore the functional significance of NEIL1, we recently reported that neil1 knock-out and heterozygotic mice develop the majority of symptoms of metabolic syndrome (Vartanian, V., Lowell, B., Minko, I. G., Wood, T. G., Ceci, J. D., George, S., Ballinger, S. W., Corless, C. L., McCullough, A. K., and Lloyd, R. S. (2006) Proc. Natl. Acad. Sci. U. S. A. 103, 1864-1869). To determine whether this phenotype could be causally related to human disease susceptibility, we have characterized four polymorphic variants of human NEIL1. Although three of the variants (S82C, G83D, and D252N) retained near wild type levels of nicking activity on abasic (AP) site-containing DNA, G83D did not catalyze the wild type β,δ-elimination reaction but primarily yielded the β-elimination product. The AP nicking activity of the C136R variant was significantly reduced. Glycosylase nicking activities were measured on both thymine glycol-containing oligonucleotides and γ-irradiated genomic DNA using gas chromatography/mass spectrometry. Two of the polymorphic variants (S82C and D252N) showed near wild type enzyme specificity and kinetics, whereas G83D was devoid of glycosylase activity. Although insufficient quantities of C136R could be obtained to carry out gas chromatography/mass spectrometry analyses, this variant was also devoid of the ability to incise thymine glycol-containing oligonucleotide, suggesting that it may also be glycosylase-deficient. Extrapolation of these data suggests that individuals who are heterozygous for these inactive variant neil1 alleles may be at increased risk for metabolic syndrome.

Original languageEnglish (US)
Pages (from-to)15790-15798
Number of pages9
JournalJournal of Biological Chemistry
Volume282
Issue number21
DOIs
StatePublished - May 25 2007

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DNA Glycosylases
Oligonucleotides
Gas Chromatography-Mass Spectrometry
Gas chromatography
Mass spectrometry
DNA
Disease Susceptibility
Knockout Mice
DNA Repair
Reactive Oxygen Species
Alleles
Phenotype
Extrapolation
Repair
Enzymes
Cells
Kinetics
thymine glycol

ASJC Scopus subject areas

  • Biochemistry

Cite this

Roy, L. M., Jaruga, P., Wood, T., McCullough, A. K., Dizdaroglu, M., & Lloyd, R. S. (2007). Human polymorphic variants of the NEIL1 DNA glycosylase. Journal of Biological Chemistry, 282(21), 15790-15798. https://doi.org/10.1074/jbc.M610626200

Human polymorphic variants of the NEIL1 DNA glycosylase. / Roy, Laura M.; Jaruga, Pawel; Wood, Thomas; McCullough, Amanda K.; Dizdaroglu, Miral; Lloyd, R. Stephen.

In: Journal of Biological Chemistry, Vol. 282, No. 21, 25.05.2007, p. 15790-15798.

Research output: Contribution to journalArticle

Roy, LM, Jaruga, P, Wood, T, McCullough, AK, Dizdaroglu, M & Lloyd, RS 2007, 'Human polymorphic variants of the NEIL1 DNA glycosylase', Journal of Biological Chemistry, vol. 282, no. 21, pp. 15790-15798. https://doi.org/10.1074/jbc.M610626200
Roy LM, Jaruga P, Wood T, McCullough AK, Dizdaroglu M, Lloyd RS. Human polymorphic variants of the NEIL1 DNA glycosylase. Journal of Biological Chemistry. 2007 May 25;282(21):15790-15798. https://doi.org/10.1074/jbc.M610626200
Roy, Laura M. ; Jaruga, Pawel ; Wood, Thomas ; McCullough, Amanda K. ; Dizdaroglu, Miral ; Lloyd, R. Stephen. / Human polymorphic variants of the NEIL1 DNA glycosylase. In: Journal of Biological Chemistry. 2007 ; Vol. 282, No. 21. pp. 15790-15798.
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