DNA methylation is a biochemical process where a methyl group is added to the cytosine or adenine DNA nucleotides. The rate of cytosine DNA methylation differs strongly between species, e.g. absolute quantification by mass spectrometry revealed 14% of cytosines methylated in Arabidopsis thaliana, 8% in Mus musculus, 2.3% in Escherichia coli, 0.03%...
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http://en.wikipedia.org/wiki/DNA_methylation
<molecular biology> Process by which methyl groups are added to certain nucleotides in genomic DNA. ... This affects gene expression, as methylated DNA is not easily transcribed. The degree of methylation is passed on to daughter strands at mitosis by maintainance DNA methylases. Accordingly, DNA methylation is thought to play an important de...
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http://www.encyclo.co.uk/local/20973
A type of epigenetic mark. Changes in methylation affect gene expression; the more methylated a stretch of DNA, the less likely it is to be transcribed to RNA.
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http://www.encyclo.co.uk/local/22237
Process by which methyl groups are added to certain nucleotides in genomic DNA. This affects gene expression, as methylated DNA is not easily transcribed. The degree of methylation is passed on to daughter strands at mitosis by maintenance DNA methylases. Accordingly, DNA methylation is thought to play an important developmental role in sequentially restricting the transcribable genes available to distinct cell lineages. In bacteria, methylation plays an important role in the restriction systems, as restriction enzymes cannot cut sequences with certain specific methylations.
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An endogenous process in the cell which adds a methyl group, -CH3, to the base cytosine or adenosine, resulting in gene-silencing, or failure of the gene to become expressed
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http://www.i-sis.org.uk/Glossary.php
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