M1G (pyrimido[1,2-a]purin-10(3H)-one) is a heterocyclic compound which is a by-product of base excision repair (BER) of a specific type of DNA adduct called M1dG. The M1dG adduct in turn is formed by a condensation reaction between guanosine nucleotides in DNA and either malondialdehyde (propanedial) [1] or acrolein.[2] If not repaired, these adducts are mutagenic and carcinogenic.

IUPAC name
3D model (JSmol)
MeSH C107643
Molar mass 187.162 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Malondialdehyde is an end product of lipid peroxidation[2] while acrolein is a result of DNA peroxidation.[3]

M1dG is the major endogenous DNA adduct in humans. M1dG adducts have been detected in cell DNA in liver, leucocytes, pancreas and breast in concentrations of 1-120 per 108 nucleotides.[1] Detection and quantification of M1dG adducts in the body as measured by free M1G is a tool for detecting DNA damage that may lead to cancer. Free M1G is also biomarker for oxidative stress.[1]


  1. Marnett LJ (1999). "Lipid peroxidation-DNA damage by malondialdehyde". Mutat. Res. 424 (1–2): 83–95. doi:10.1016/S0027-5107(99)00010-X. PMID 10064852.
  2. Seto H, Okuda T, Takesue T, Ikemura T (1983). "Reaction of Malonaldehyde with Nucleic Acid. I. Formation of Fluorescent Pyrimido[1,2-a]purin-10(3H)-one Nucleosides". Bulletin of the Chemical Society of Japan. 56 (6): 1799–1802. doi:10.1246/bcsj.56.1799.
  3. Knutson CG, Akingbade D, Crews BC, Voehler M, Stec DF, Marnett LJ (March 2007). "Metabolism in vitro and in vivo of the DNA base adduct, M1G". Chem. Res. Toxicol. 20 (3): 550–7. doi:10.1021/tx600334x. PMID 17311424.
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