Methylation

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.
Related ...
Full article >>>

Methylation of DNA is a common method of gene silencing. DNA is typically methylated by methyltransferase enzymes on cytosine nucleotides in a CpG dinucleotide sequence (also called "CpG islands").
Full article >>>

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.
Full article >>>

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. Link to discussion.) ...
Full article >>>

DNA methylation regulates Tn10 transposition by at least three mechanisms.
Facts ...
Full article >>>

Hemimethylation
Double stranded DNA in which only one strand is methylated at a particular site. For example, at GATC sites in E.
Full article >>>

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 ...
Full article >>>

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.
Full article >>>

Structural approaches to understanding ribosome biogenesis and rRNA methylation at extreme temperatures.
Carl Friddle (Stanford University, Genetics): Lawrence Berkeley National Laboratory, Edward Rubin.
Full article >>>

These changes include histone modifications, such as histone H3 methylation and histone H2A ubiquitylation , as well as direct modification of the DNA itself, via the methylation of CpG sites.
Full article >>>

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.
Full article >>>

This is called epigenetic inheritance and may include phenomena such as DNA methylation, prions, and structural inheritance.
Full article >>>

Jeffrey Yoder et al "Cytosine methylation and the ecology of intragenomic parasites", Trends in Genetics, Aug 1997, vol 13, no. 8 [PubMed]
Acknowledgements ...
Full article >>>

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.
Full article >>>

Maintenance methylase: An enzymatic activity responsible for maintaining the patterns of methylation on each strand of a DNA molecule after replication.
Mapping: See gene mapping, linkage map, physical map.
Marker: Two typical usages: ...
Full article >>>

: Differing expression of genetic material dependent on the parent-of-origin. This is due to
methylation
of one of the alleles depending of its origin. A very illustrative example is the inherited neck
tumor ...
Full article >>>

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.
Full article >>>


'"/>