(mentions CMT) SHUTTING OFF A GENE CAUSES MOBILITY ISSUES, RESEARCHERS SAY

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SHUTTING OFF A GENE CAUSES MOBILITY ISSUES, RESEARCHERS SAY

Posted on October 25, 2010, 1:42 am

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sues-researchers-say/

Marek Michalak and Kraus worked with an international team of medical

researchers.

Researchers at the University of Alberta have discovered that shutting off an

important gene in the body causes mobility issues, reminiscent of neurological

diseases like multiple sclerosis.

The discovery may have major implications for neurological diseases and other

disorders of the nervous system that deal with something called myelin

impairment. Myelin is the protective coating around neurons and is important

because it allows messages to quickly travel within the nervous system.

Two scientists from the Faculty of Medicine & Dentistry, Marek Michalak and

Kraus, made the discovery while working with an international team of

medical researchers, including colleagues throughout Alberta. About five years

ago, Michalak and Kraus decided they wanted to research a specific type of gene

that is responsible for the protein folding ability in cells. Depending on the

protein and their purpose in a cell, they & #65533;fold & #65533; themselves into

certain shapes to perform their function. They assemble themselves based on the

instructions they get from genes in the cell. But i f protein-folding functions

in cells don & #65533;t work properly, it can lead to a host of diseases,

including multiple sclerosis.

The duo wanted to specifically study what would happen if they removed a

specific chaperone, a protein used in the cell-folding process, called calnexin.

In doing so, they inadvertently created a neurological disease in their

experimental models. The laboratory models had numerous mobility issues and the

speed of messages being relayed in the nervous systems of the test subjects were

delayed as well. The symptoms displayed were very similar to the symptoms seen

in people with myelin impairment diseases such as MS and Charcot Marie Tooth

disease, a neurological disorder that involves myelin impairment.

It was a surprise, says Kraus, a PhD student. We never expected to find out what

we did. Then we needed to expand our study and that's when it became a bigger

and more collaborative effort with numerous researchers around the globe

becoming involved.

Michalak and Kraus say their findings provide a step forward in understanding

the complexity of neurological diseases and may one day lead to the development

of better treatments for common neurological diseases. The next step for

researchers is to study DNA from people with certain neurological diseases to

see if this gene contains mutations that could contribute to their disease.

The results of the duos research, recently published in The Journal of

Biological Chemistry, clearly showed for the first time that chaperones impact

myelin, something that no one had realized until now.

Myelin diseases are so diverse and so tricky to figure out, says Michalak, a

professor in the department of biochemistry. Nobody understands why these

diseases, which cause people to progressively lose their motor functions,

happen. We have discovered a new player in myelin diseases that was never

considered before.

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