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Chromatin, Epigenetics & Transcription![]() Trevor K. Archer, Ph.D.
Principal Investigator and Chief, Laboratory of Molecular Carcinogenesis Tel (919) 316-4565 Fax (919) 316-4566 archer1@niehs.nih.gov P.O. Box 12233 Mail Drop D4-01 Research Triangle Park, North Carolina 27709 Delivery Instructions Research SummaryThe American Cancer Society(http://www.cancer.org/docroot/STT/STT_0.asp) ![]() Figure 1. Glucocorticoid Receptor Activated
In human cells, DNA is organized with the aid of small basic proteins, histones, to form chromatin. The nucleosome, comprising 147 base pairs of DNA and 2 copies each of histones H2a, H2b, H3 and H4, is the fundamental organizing principle of chromatin. It is this architecture that is the substrate for epigenetic regulation. Biological processes have to overcome this inherently repressive structure and do so with the aid of two classes of enzymes. The first class disrupts chromatin structure using ATP-dependent chromatin remodeling, and the second class mediates the covalent modification of histone proteins. These enzymes and their activities often are altered in cancer cells, thus becoming important targets for novel therapeutics. The mechanisms by which cells regulate the steady state levels of proteins is clearly critical to understanding disease. While cells have multiple systems for protein degradation, the ubiquitin-proteasome system (UPS) as possibly the best described and most actively studied. The UPS is both highly complex and tightly regulated perhaps contributing to its relevance to human health and disease, particularly cancer. Indeed drugs targeting the UPS represent potentially important treatments for specific cancers and neurodegenerative diseases. The development of human embryonic stem cells almost 10 years ago ushered in a exciting and controversial era in molecular medicine. The shared characteristic for continuous self renewal and ability to differentiate into all cell types is thought to imbue these cells with great therapeutic potential. For this reason, the mechanisms that underpin reprogramming of the genetic repertoire of these cells represent attractive targets for chromatin and epigenetic studies. Major areas of research:
Current projects:
Trevor A. Archer, Ph.D., leads the Chromatin & Gene Expression Group and is Chief of the Laboratory of Molecular Carcinogenesis. He earned his Ph.D. in 1987 at Queen’s University, Kingston Ontario Canada. He has published more than 60 peer-reviewed articles in leading biomedical journals as well as several book chapters. He served as a Tenured Associate Professor in the Departments of Biochemistry and Obstetrics and Gynecology at the University of Western Ontario in London Canada before joining NIEHS in 1999. |
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