In the chemical sciences, methylation denotes the addition of a methyl group to a substrate or the substitution of an atom or group by a methyl group. Methylation is a form of alkylation with a methyl group, rather than a larger carbon chain, replacing a hydrogen atom. These terms are commonly used in chemistry, biochemistry, soil science, and the...
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http://en.wikipedia.org/wiki/Methylation
(from the article `poison`) Two types of conjugations, acetylations and methylation, do not enhance the excretion of the parent chemical. Acetylation and methylation decrease ... Three types of natural methylation have been reported in DNA. Cytosine can be modified either on the ring to form 5-methylcytosine or on the ... [2 related ...
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http://www.britannica.com/eb/a-z/m/80
A chemical reaction in which a small molecule called a methyl group is added to other molecules. Methylation of proteins or nucleic acids may affect how they act in the body.
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http://www.cancer.gov/dictionary?expand=M
A biochemical process that involves the modification of a molecule by the addition of a methyl group to DNA. Thought to be a mechanism in X-chromosome inactivation, imprinting, and gene silencing. See
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http://www.cat-world.com.au/glossary
Addition of methyl groups. In histo-chemistry methylation is used to esterify carboxyl groups and remove sulfate groups by treating tissue sections with hot methanol in the presence of hydrochloric acid. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
(meth″әl-a´shәn) the addition of methyl groups. DNA methylation the postsynthetic addition of methyl groups to specific sites on DNA molecules; the reaction is catalyzed by enzymes called DNA methyltransferases that are specific for nucleotide and position of me...
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Addition of a methyl group (-ch3) to dna or rna.
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When a base on the DNA strand is altered by the addition of a methyl group. This change causes that section of DNA to coil more tightly, preventing the genes around if from being used or expressed. This process is important as embryos develop and new cells take on specific roles in the body, but errors in DNA methylation have been linked to many hu...
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http://www.genesinlife.org/glossary
Type: Term Pronunciation: meth-i-lā′shŭn Definitions: 1. Addition of methyl groups; in histochemistry, used to esterify carboxyl groups and remove sulfate groups by treating tissue sections with hot methanol in the presence of hydrochloric acid, the net effect being to reduce tissue basophilia and abolish metachromasia. &nbs...
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http://www.medilexicon.com/medicaldictionary.php?t=54909
Methylation: 1. In chemistry, the addition of a methyl group to a molecule. 2. On a protein level, the addition of a methyl group or groups to the amino acid arginine or lysine in a protein. 3. On a DNA level, the addition of a methyl group to a cytosine residue to convert it to 5-methylcytosine. Methylation of DNA occurs at CpG sites, where cytosi...
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