Medical Definition of DNA methylation

1. 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 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. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of DNA Methylation

DNA helicases
DNA helix
DNA homology
DNA hybridisation
DNA hybridization
DNA insertion elements
DNA iteron
DNA ladder
DNA ladders
DNA library
DNA ligase
DNA ligases
DNA ligation
DNA markers
DNA melting
DNA methylation (current term)
DNA microarray
DNA microarrays
DNA modification
DNA modification methylases
DNA mutational analysis
DNA nucleotidylexotransferase
DNA nucleotidyltransferases
DNA photolyase
DNA polymerase
DNA polymerase II
DNA polymerase III
DNA polymerase beta
DNA polymerase i
DNA polymerisation

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