Regulation of intracellular localization of human MTH1, OGG1, and MYH proteins for repair of oxidative DNA damage

Research output: Chapter in Book/Report/Conference proceedingConference contribution

119 Citations (Scopus)

Abstract

In mammalian cells, more than one genome has to be maintained throughout the entire life of the cell, one in the nucleus and the other in mitochondria. It seems likely that the genomes in mitochondria are highly exposed to reactive oxygen species (ROS) as a result of their respiratory function. Human MTH1 (hMTHI) protein hydrolyzes oxidized purine nucleoside triphosphates, such as 8-oxo-dGTP, 8-oxo-dATP, and 2-hydroxy (OH)-dATP, thus suggesting that these oxidized nucleotides are deleterious for cells. Here, we report that a single-nucleotide polymorphism (SNP) in the human MTH1 gene alters splicing patterns of hMTH1 transcripts, and that a novel hMTH1 polypeptide with an additional mitochondrial targeting signal is produced from the altered hMTH1 mRNAs; thus, intracellular location of hMTH1 is likely to be affected by a SNP. These observations strongly suggest that errors caused by oxidized nucleotides in mitochondria have to be avoided in order to maintain the mitochondrial genome, as well as the nuclear genome, in human cells. Based on these observations, we further characterized expression and intracellular localization of 8-oxoG DNA glycosylase (hOGG1) and 2-OH-A/adenine DNA glycosylase (hMYH) in human cells. These two enzymes initiate base excision repair reactions for oxidized bases in DNA generated by direct oxidation of DNA or by incorporation of oxidized nucleotides. We describe the detection of the authentic hOGG1 and hMYH proteins in mitochondria, as well as nuclei in human cells, and how their intracellular localization is regulated by alternative splicing of each transcript.

Original languageEnglish
Title of host publicationProgress in Nucleic Acid Research and Molecular Biology
Subtitle of host publicationBase Excsion Repair
EditorsKive Moldave
Place of PublicationSan Dieg, CA, USA
PublisherAcademic Press Inc.
Pages75-94
Number of pages20
ISBN (Print)0125400683, 9780125400688
Publication statusPublished - Dec 1 2001

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DNA Damage
Mitochondria
DNA Glycosylases
Proteins
Nucleotides
Single Nucleotide Polymorphism
Genome
Purine Nucleosides
Mitochondrial Genome
DNA
Alternative Splicing
Human Genome
DNA Repair
Reactive Oxygen Species
Messenger RNA
Peptides
Enzymes
Genes

All Science Journal Classification (ASJC) codes

  • Molecular Biology

Cite this

Nakabeppu, Y. (2001). Regulation of intracellular localization of human MTH1, OGG1, and MYH proteins for repair of oxidative DNA damage. In K. Moldave (Ed.), Progress in Nucleic Acid Research and Molecular Biology: Base Excsion Repair (pp. 75-94). San Dieg, CA, USA: Academic Press Inc..

Regulation of intracellular localization of human MTH1, OGG1, and MYH proteins for repair of oxidative DNA damage. / Nakabeppu, Yusaku.

Progress in Nucleic Acid Research and Molecular Biology: Base Excsion Repair. ed. / Kive Moldave. San Dieg, CA, USA : Academic Press Inc., 2001. p. 75-94.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nakabeppu, Y 2001, Regulation of intracellular localization of human MTH1, OGG1, and MYH proteins for repair of oxidative DNA damage. in K Moldave (ed.), Progress in Nucleic Acid Research and Molecular Biology: Base Excsion Repair. Academic Press Inc., San Dieg, CA, USA, pp. 75-94.
Nakabeppu Y. Regulation of intracellular localization of human MTH1, OGG1, and MYH proteins for repair of oxidative DNA damage. In Moldave K, editor, Progress in Nucleic Acid Research and Molecular Biology: Base Excsion Repair. San Dieg, CA, USA: Academic Press Inc. 2001. p. 75-94
Nakabeppu, Yusaku. / Regulation of intracellular localization of human MTH1, OGG1, and MYH proteins for repair of oxidative DNA damage. Progress in Nucleic Acid Research and Molecular Biology: Base Excsion Repair. editor / Kive Moldave. San Dieg, CA, USA : Academic Press Inc., 2001. pp. 75-94
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