epigenetics

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epigenetics

(ĕp′ĭ-jə-nĕt′ĭks)
n. (used with a sing. verb)
The study of heritable changes in gene expression that are caused by factors such as DNA methylation rather than by a change in the sequence of base pairs in DNA itself.

epigenetics

(ĕp″ĭ-jĕ-nĕt′ĭks)
Changes in the way genes are expressed that occur without changes in the sequence of nucleic acids. In mammals the most common form of epigenetic change results from methylation (the addition of methyl [-CH3] moieties) to the promoter regions of genes. Although epigenetic changes do not alter the sequence of nucleotides, they are inheritable.
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References in periodicals archive ?
Simultaneous hyper- and hypomethylation at imprinted loci in a subset of patients with GNAS epimutations underlies a complex and different mechanism of multilocus methylation defect in pseudohypoparathyroidism type 1b.
It is necessary to be sure that it is going to be awakened a direct reflection of our embryological origin, and mutations or epimutations are just instruments to express the different potential that each germ layer possesses.
Cancer-causing nuclear mutations (and epimutations)
Altered epigenetic modifications (i.e., epimutations) may also be passed on from one generation to the next.
Skinner, "Plastics derived endocrine disruptors (BPA, DEHP and DBP) induce epigenetic transgenerational inheritance of obesity, reproductive disease and sperm epimutations," PloS One, vol.
(13) In many cases wherein epimutations are associated with disease, direct causality has not yet been determined.
Hydrocarbons (jet fuel JP-8) induce epigenetic transgenerational inheritance of obesity, reproductive disease and sperm epimutations. Reprod Toxicol 2013; 36:104-116.
(2008) Deletions and epimutations affecting the human chromosome 14q32.2 imprinted region in individuals with paternal and maternal upd (14)-like phenotypes.
This understanding may allow for improvement of healthy aging by reversing disease-prone epimutations involved in chronic inflammatory and metabolic disorders.
Richards, "Developmental abnormalities and epimutations associated with DNA hypomethylation mutations," Proceedings of the National Academy of Sciences of the United States of America, vol.
Importantly, VELs are not mutations in the actual DNA sequence, but rather are changes in proteins that bind to DNA, a type of alteration known as "epigenetic" or "epimutations." This is a critical finding because such epimutations are potentially reversible.
Recently, spermatozoal RNA has been used as a noninvasive means to identify germline epimutations (5), but it was found to be unsuitable in individuals with azoospermia (complete absence of sperm).