New to the field and want to get up to speed quick? Take a dive into our Epigenetics Background section. With a field that’s changing so rapidly, we can’t promise every bit will still hold true, but it should point you in the right direction.
Epigenetics has been changing so fast that it makes maintaining a “Background” section almost impossible. Fortunately for us, our friends at Zymo Research and Active Motif produced some really nice review content with the help of some of the field’s top researchers and their own scientists. What’s even nicer is that they let us use it. If you’d like to print out a hard copy, you can find links to the downloads in each of these expanded sections.
The field of epigenetics, transcending genetics, genomics, and molecular biology, is now poised to be the vanguard of biological science. The rise of epigenetics marks a maturation of the field, which only 50 years ago was given its name and a vague definition, but is now a dynamic discipline, challenging and revising traditional paradigms of inheritance. Through epigenetics the classic works of Charles Darwin, Gregor Mendel, and Jean-Baptiste Lamarck are now seen in different ways. As more factors influencing heredity are discovered, today’s scientists are using epigenetics to decipher the roles of DNA, RNA, proteins, and environment in inheritance.
The future of epigenetics will reveal the complexities of genetic regulation, cellular differentiation, embryology, aging, cancer, and other diseases. In this review fundamental concepts of epigenetics will be described, including chromatin structure, epigenetic markers, model systems, research methods, and future directions. Read more on Epigenetics Background
Epigenetic Regulation in Mammalian Genomes
DNA methylation, histone modifications and higher order chromatin structure play a central role in the regulation of mammalian genome organization. The epigenetic signature of any cell provides valuable information about its cellular state, its developmental potential, and its health. A detailed description and understanding of the epigenome will notably expand our understanding of human health and disease. The aim of this review is to provide a broad overview of epigenetic modifications and mechanisms in large mammalian genomes. Read more on Epigenetic Regulation in Mammalian Genomes.
Epigenetics in Cancer
Cancer is caused by failure of checks and balances that control cell numbers in response to the needs of the whole organism. Inappropriate function of genes that promote or inhibit cell growth or survival can be caused by errors introduced into the genetic code itself or by faulty epigenetic mechanisms deciding which genes can and cannot be expressed. Epigenetic lesions and genetic mutations are acquired during the life of an individual and accumulate with aging. Both types of events, either individually or in cooperation, can result in the loss of control over cell growth and development of cancer. Read more on Epigenetics in Cancer.
Epigenetic Regulation of Gene Expression in Insects and Plants
Epigenetic gene regulatory mechanisms are important in a variety of phenomena throughout the eukaryotes including the silencing of transposons, sex chromosome dosage compensation, imprinting,and the inappropriate gene expression that occurs in cancer cells. In addition, recent findings suggest that epigenetic mechanisms play an unforeseen and expanding role in the normal regulation of genes during development. This review will focus on advances made in our understanding of epigenetic gene regulation in insect and plants. Read more on Epigenetic Regulation of Gene Expression in Insects and Plants.
Histone Acetylation and Genome Function
The role of histone acetylation and its involvement in the regulation of transcription has long been a topic of research in cell and molecular biology labs. Recent studies have revealed the role of histone acetylation in other important processes regulating the structure and function of chromatin, and hence, the eukaryotic genome. The process of organizing the millions (billions in the case of humans) of base pairs of genetic material in the eukaryotic nucleus has profound effects on DNA-dependent events, such as transcription, recombination, replication and repair. DNA is organized by its incorporation into chromatin, the basic subunit of chromatin being the nucleosome. A nucleosome is composed of 147 base pairs of DNA coiled around an octamer of histone proteins, two molecules each of histone H2A, H2B, H3 and H4. Histone H1 associates with chromatin outside the core octamer unit and regulates higher order chromatin structure.
Chromatin and chromosomes undergo dramatic and dynamic changes in organization in response to a myriad of cellular signals. Chromosomes condense and relax during the cell division process. Damaged DNA adopts a unique structure that facilitates repair. Critical to cell function, most of the genome must remain in a transcriptionally silent state, save for specific combinations of genes, which vary significantly between cell types. These processes must be tightly regulated to maintain the integrity of the genome and the proper function of the cell. Read more on Histone Acetylation and Genome Function.