News tagged with dna methylation

Related topics: genes , cancer , dna sequences , gene expression , embryonic stem cells

DNA signature found in ice storm babies

The number of days an expectant mother was deprived of electricity during Quebec's Ice Storm (1998) predicts the epigenetic profile of her child, a new study finds.

Sep 29, 2014
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Throwing a loop to silence gene expression

All human cells contain essentially the same DNA sequence – their genetic information. How is it possible that shapes and functions of cells in the different parts of the body are so different? While every cell's DNA contains ...

Sep 02, 2014
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How black truffles deal with the jumpers in their genome

The black truffle uses reversible epigenetic processes to regulate its genes, and adapt to changes in its surroundings. The 'methylome' - a picture of the genome regulation taking place in the truffle, is published in the ...

Jul 31, 2014
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DNA methylation

DNA methylation is a type of chemical modification of DNA that can be inherited and subsequently removed without changing the original DNA sequence. As such, it is part of the epigenetic code and is also the best characterized epigenetic mechanism. Because methylation is a common capability of all viruses for self non-self identification, the epigenetic code could be a persistent remnant of ancient viral infection events.

DNA methylation involves the addition of a methyl group to DNA — for example, to the number 5 carbon of the cytosine pyrimidine ring — in this case with the specific effect of reducing gene expression. DNA methylation at the 5 position of cytosine has been found in every vertebrate examined. In adult somatic tissues, DNA methylation typically occurs in a CpG dinucleotide context; non-CpG methylation is prevalent in embryonic stem cells.

In plants, cytosines are methylated both symmetrically (CpG or CpNpG) and asymmetrically (CpNpNp), where N can be any nucleotide but guanine.

Research has suggested that long term memory storage in humans may be regulated by DNA methylation.

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