title: Epigenetics: regulation through repression.
abstract: Epigenetics is the study of heritable changes in gene expression that occur without a change in DNA sequence. Epigenetic phenomena have major economic and medical relevance, and several, such as imprinting and paramutation, violate Mendelian principles. Recent discoveries link the recognition of nucleic acid sequence homology to the targeting of DNA methylation, chromosome remodeling, and RNA turnover. Although epigenetic mechanisms help to protect cells from parasitic elements, this defense can complicate the genetic manipulation of plants and animals. Essential for normal development, epigenetic controls become misdirected in cancer cells and other human disease syndromes.
authors.affiliation: Laboratory of Molecular Embryology, National Institute of Child Heath and Human Development, NIH, Building 18T, Room 106, Bethesda, MD 20892-5431, USA. awlme@helix.nih.gov
authors.forename: A P
authors.initials: AP
authors.lastname: Wolffe
authors.forename: M A
authors.initials: MA
authors.lastname: Matzke
mesh_terms: D000818:Animals; D019175:DNA Methylation; D019143:Evolution, Molecular; D005786:Gene Expression Regulation; D018507:Gene Expression Regulation, Developmental; D020868:Gene Silencing; D030342:Genetic Diseases, Inborn / Q000235:genetics; D016678:Genome; D006801:Humans; D009369:Neoplasms / Q000235:genetics; D012313:RNA / Q000235:genetics / Q000378:metabolism; D012091:Repetitive Sequences, Nucleic Acid
chemical_list: D012313:RNA