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Tiny Gene Changes Means Big Differences in Pain: Fibromyalgia News

  [ 261 votes ]   [ Discuss This Article ]
www.ProHealth.com • August 2, 2004


A 2003 study by US researchers has linked differences in the way people withstand pain - both physical and emotional stress - to a gene which makes a protein important for brain chemistry. The gene makes catechol-O-methyl transferase (COMT), an enzyme vital for mopping up the dopamine - a brain chemical linked with sensing pain. Tough guys and wimps carry different forms of the gene, according to Jon-Kar Zubieta and his team at the University of Michigan and The National Institute of Alcohol and Alcoholism, Rocksville, Maryland.

People with a particularly active form of COMT were hardier, whereas people with a less active form of COMT felt pain more acutely. Those with both forms of the gene, one from each parent, experienced intermediate pain. The COMT gene exists in two forms which make copies differing by a single amino acid only either valine or methionine. This small variation has a big effect on the activity of COMT, say the researchers. People with the laziest form of the gene - who have two copies of the methionine version - make enzymes three to four-fold less effective than the other variants containing just valine or one of each.

The team used brain imaging or positron emission tomography to examine the brain activity of 29 people who were subjected to a "tolerable" pain over 20 minutes. The volunteers were given a salt water injection into their jaw muscles to simulate a condition called temporomandibular joint pain disorder. They rated their own level of pain every 15 seconds during the brain imaging. Dr.Zubieta, the chief investigator predicted correctly that those people who were able to metabolise dopamine best because both copies of their gene were of the valine form would feel least pain. He said: "Depending on the genotype you have inherited there is a gradation in pain responsiveness. In people with two copies of the methionine form of COMT, the dopamine is not cleared fast enough. If this becomes chronic the uncleared dopamine starts to act on a second brain pathway regulating pain and stress". Based on these results one could predict that a quarter of the population would be pain sensitive types, a quarter would be more stoic types, and half would be in between. Source: NewScientist.com news service



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