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Stress can control our genes
Date:9/24/2010

Stress has become one of the major disease states in the developed world. But what is stress? It depends on from where you look. You may experience stress as something that affects your entire body and mind, the causes of which are plentiful. But if we zoom in on the building bricks of the body, our cells, stress and its causes are defined somewhat differently. Stress can arise at the cellular level after exposure to pollution, tobacco smoke, bacterial toxins etc, where stressed cells have to react to survive and maintain their normal function. In worst case scenario, cellular stress can lead to development of disease.

Researchers from Dr.Klaus Hansen's group at BRIC, University of Copenhagen, have just shown that external factors can stress our cells through the control of our genes. "We found that stress-activating factors can control our genes by turning on certain genes that were supposed to be silenced. It is very important that some genes are on and others are off in order to ensure normal foetal development and correct function of our cells later in life" says Dr. Klaus Hansen. Simmi Gehani, PhD-student in the Hansen group, found that exposing human cells to a stress-activating compound turned on silenced genes. Even brief changes in gene activation can be disastrous during foetal development as establishment of correct cellular identity can be disturbed in our cells. But altered gene activity can also have consequences in the adult body. "For example, one could imagine that prolonged stress causes nerve cells in the brain to produce hormones and other signalling molecules they do not normally produce and this can disturb normal brain function" says Simmi Gehani.

The Hansen research group is very interested in understanding how our genes are turned on and off. "We know that different protein complexes can associate with specific proteins (histones) to which DNA is wound around and thereby determine whether the genes are active or inac
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Contact: Klaus Hansen
klaus.hansen@bric.ku.dk
453-532-5664
University of Copenhagen
Source:Eurekalert  

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