Methylation pattern of mouse mitochondrial DNA

Yaakov Pollack*, Judith Kasir, Ruth Shemer, Shulamit Metzger, Moshe Szyf

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

133 Scopus citations


The pattern of methylation of mouse mitochondrial DNA (mtDNA) was studied using several techniques. By employing a sensitive analytical procedure it was possible to show that this DNA contains the modified base 5-methylcytosine (m5Cyt). This residue occurred exclusively at the dinucleo-tide sequence CpG at a frequency of 3 to 5%. The pattern of methylation was further investigated by determining the state of methylation of several MspI(HpaII) sites. Different sites were found to be methylated to a different extent, implying that methylation of mtDNA is nonrandom. Based on the known base composition and nucleotide sequence of mouse mtDNA, the dinucleo-tide sequence CpG was found to be underrepresented in this DNA.The features of mtDNA methylation (CpG methylation, partial methylation of specific sites and CpG underrepresentation) are also characteristic of vertebrate nuclear DNA. This resemblance may reflect functional relationship between the mitochondrial and nuclear genomes.

Original languageAmerican English
Pages (from-to)4811-4824
Number of pages14
JournalNucleic Acids Research
Issue number12
StatePublished - 25 Jun 1984


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