Navigation Links
Environmental epigenetics has potential for preventing and treating disease

New research on environmental influences on health and disease has begun to shed light on why genetically identical individuals demonstrate different characteristics, such as susceptibility to disease. Scientists have found that environmental exposure to nutritional, chemical and physical factors can alter the epigenome. Literally meaning above the genome, the epigenome refers to differences in gene expression that are inherited without changing the sequence of DNA.

An article publishing in the January 2008 issue of Environmental and Molecular Mutagenesis examines some of the epigenetic mechanisms linked to disease, and explores how they occur and their significance in understanding, treating and preventing disease. Environmental and Molecular Mutagenesis, the official journal of the Environmental Mutagen Society, is published by John Wiley & Sons, Inc. and is available online via Wiley InterScience at

Authors Randy L. Jirtle and Dana C. Dolinoy of Duke University Medical Center in Durham, North Carolina, discuss genomic imprinting, a form of gene regulation in which epigenetic modifications in chromosomes result in differences in gene expression. First identified in 1991, there are approximately 80 imprinted genes that have been identified in mice and humans. Because imprinted genes behave as if they have a single set of chromosomes rather than the usual two, the health consequences of mutations in these genes are potentially disastrous, resulting in diseases such as cancer and several severe pediatric developmental disorders. In addition, mutations that occur in non-imprinted regions can influence the regulation of imprinted genes. The authors previously demonstrated that imprinting evolved anywhere from 230 to 150 million years ago, arising in mammals with the evolution of the placenta. They note that the expression of imprinted genes is species, tissue and developmental stage dependent and may play an important role in the speciation of mammals.

The article cites several studies involving metastable epialleles, which are alternate forms of a gene that are expressed due to epigenetic modifications linked to maternal nutrition and environmental exposure during very early development. The authors note that simple dietary changes were found to protect against the negative effects of environmental toxins on the fetal epigenome. They also cite evidence that embryos are vulnerable to environmentally-induced epigenetic alterations early in their development, highlighting the need to analyze the timing of exposure in order to fully understand environmental epigenomics.

The advent of bioinformatics has allowed researchers to more readily search the entire mouse genome for imprinted genes, but the real power of this approach has been recently demonstrated in its application to the human genome. While 2.5 percent of the mouse genome contains potentially imprinted genes, only 0.75 percent of the human genome is predicted to be imprinted. This means that the mouse genome may not be a suitable model for assessing human disease risk due to epigenetic mutations in imprinted genes. The authors point out the necessity of developing bioinformatic models that can identify metastable epialleles in order to characterize all of the genes susceptible to environmental influences.

With the identification of epigenetically unstable locations in the human genome, it will be possible to screen individuals at an early age for epigenetically susceptible diseases, allowing for closer monitoring and more frequent follow-up. In addition, unlike genetic mutation, epigenetic profiles are potentially reversible. Therefore, epigenetic approaches for prevention and treatment, such as nutritional supplementation and/or pharmaceutical therapies may be developed to counteract negative epigenomic profiles, the authors conclude. The future of epigenomics therapy holds tremendous potential for not only individualized health care but also for population-wide disease diagnostic, screening, and prevention strategies.


Contact: Sean Wagner
Blackwell Publishing Ltd.

Related biology news :

1. Pervasive environmental sensing a possibility
2. Environmental groups call for increased protection of coral reefs
3. Nonlinear ecosystem response points to environmental solutions
4. Smithsonian scientists highlight environmental impacts of biofuels
5. Waterborne carbon increases threat of environmental mercury
6. Environmental exodus
7. New journal Energy & Environmental Science to be launched by RSC Publishing
8. Environmental researchers propose radical human-centric map of the world
9. Relationship between environmental stress and cancer elucidated
10. Food and environmental sustainability focus of ASA-CSSA-SSSA Annual Meetings
11. UC-Riverside partners with Chinese university to address Chinas environmental problems
Post Your Comments:
(Date:11/17/2015)... Paris from 17 th until ... from 17 th until 19 th November ... has invented the first combined scanner in the world which scans ... Until now two different scanners were required: one for passports ... on the same surface. This innovation is an ideal solution ...
(Date:11/17/2015)... EASTON, Mass. , Nov. 17, 2015 ... a leader in the development and sale of broadly ... the worldwide life sciences industry, today announced it has ... of its $5 million Private Placement (the "Offering"), increasing ... to $4,025,000.  One or more additional closings are expected ...
(Date:11/12/2015)... Nov. 12, 2015  Arxspan has entered into ... and Harvard for use of its ArxLab cloud-based ... tools. The partnership will support the institute,s efforts ... chemical research information internally and with external collaborators. ... for managing the Institute,s electronic laboratory notebook, compound ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... , Nov. 24, 2015  Tikcro Technologies Ltd. (OTCQB: TIKRF) today ... December 29, 2015 at 11:00 a.m. Israel time, ... Tower, 98 Yigal Allon Street, 36 th Floor, Tel ... Eric Paneth and Izhak Tamir to the Board ... Skaliter as external directors; , approval of an amendment to certain ...
(Date:11/24/2015)... , Nov. 24, 2015  Twist Bioscience, ... that Emily Leproust, Ph.D., Twist Bioscience chief executive ... Healthcare Conference on December 1, 2015 at 3:10 ... in New York City. --> ... . Twist Bioscience is on Twitter. Sign ...
(Date:11/24/2015)... ... November 24, 2015 , ... InSphero AG, the leading supplier of ... has promoted Melanie Aregger to serve as Chief Operating Officer. , Having ... management team and was promoted to Head of InSphero Diagnostics in 2014. ...
(Date:11/24/2015)... , Nov. 24, 2015 /CNW Telbec/ - ProMetic Life Sciences ... today that Mr. Pierre Laurin , President and Chief ... at the upcoming Piper Jaffray 27 th Annual Healthcare ... on December 1-2, 2015. st , at ... one-on-one meetings throughout the day. The presentation will be available ...
Breaking Biology Technology: