DNA methylation
A post-replication process. Cytosine residues in CpG sequences are methylated, forming gene-specific methylation patterns. Methylation of promoter regions correlates with gene expression patterns.
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methylation
Several protein residues can be methylated, most notably the positive groups of lysine and arginine. Methylation at these sites is used to regulate the binding of proteins to nucleic acids.
Hemimethylation
Double stranded DNA in which only one strand is methylated at a particular site. For example, at GATC sites in E.
DNA methylation
The addition of methyl groups (-CH3) to bases of DNA after DNA synthesis; may serve as a long-term control of gene expression.
DNA polymerase ...
DNA methylation in vertebrates The addition of a methyl group to a cytosine base of a CpG dinucleotide to form 5-methylcytosine. in micro-organisms many other methylation positions may be used.
Methylation
Attachment of methyl groups (-CH3) to DNA most commonly at cytosine residues. May be involved in regulation of gene expression. Also may prevent some restriction endonucleases from cutting DNA at their recognition sites.
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Methylation of lysine-4 in H3 is associated with active genes while
methylation of lysine-9 in H3 is associated with inactive genes. (These include those imprinted genes that have been permanently inactivated in somatic cells.
Undermethylation
Deficiency in DNA-methylation.
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Methylation
Attachment of methyl groups (-CH3) to DNA most commonly at cytosine residues. May be involved in regulation of gene expression.
the number of DNA methylation sites
D.
the number of times a simple DNA sequence is repeated ...
Cuts nonspecifically a distance greater than 1000 bp from its recognition sequence and contains both restriction and methylation activities. Type II. Cuts at or near a short, and often symmetrical, recognition sequence.
Structural approaches to understanding ribosome biogenesis and rRNA methylation at extreme temperatures.
Carl Friddle (Stanford University, Genetics): Lawrence Berkeley National Laboratory, Edward Rubin.
At the replication fork, nucleosomes, transcription factors and RNA polymerases are stripped off the DNA, the DNA double strands are unzipped and DNA methylation marks may be erased.
Kling, Jim. 2003. Put the blame on methylation. The Scientist 16[12]:27-28.
Gene silencing by methylation rather than by gene mutation may create some cancer cells.
See: methyl transferase and dNA methylation.
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Box C/D containing snoRNAs (U14, U15, U16, U20, U21 and U24-U63) direct site-specific methylation of various ribose moieties. Box H/ACA containing snoRNAs (E2, E3, U19, U23, and U64-U72) direct the conversion of specific uridines to pseudouridine.
For example, homocysteine is formed through the transsulfuration pathway or by the demethylation of methionine via the intermediate metabolite S-adenosyl methionine, [21] while dopamine is synthesized from l-DOPA, ...
Jeffrey Yoder et al "Cytosine methylation and the ecology of intragenomic parasites", Trends in Genetics, Aug 1997, vol 13, no. 8 [PubMed]
Acknowledgements ...
Methylation involves adding methyl groups (CH3) after DNA is synthesized. Shortly after DNA is synthesized, however, the new strand is not yet methylated.. Mismatch repair enzymes are able to detect which strand is not methylated.
Fluorouracil An analog of dump that inhibits the methylation of dump to form thymidylate; fluorouracil is used in chemotherapy.
The cell's own DNA is protected by addition of a methyl group to one of the bases at the site where the endonuclease would cut it. Methylation is carried out by an enzyme called a methylase which matches with the RE present in the cell.
Cytosine has one other interesting property that none of the other nucleotides have, is that very often in the cell, cytosine can have an extra chemical attached to them, a methyl group. And this DNA methylation at cytosines is thought helps ...
On the other hand, many genes with restricted expression patterns have (methylated) CpG islands located downstream of transcription initiation does not block elongation of the transcript (see also Methylation paradox).
Methylation -- addition of a methyl group (-CH3) to DNA or RNA. Methylmalonic acidemia -- a group of conditions characterized by the inability to metabolize methylmalonic acid or by a defect in the metabolism of Vitamin B12.
 See also: DNA, Gene, Trans, Sequence, Protein
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