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Scientists led by Washington University School of Medicine in St. Louis have identified the first gene directly linked to the most common form of psoriasis, a chronic skin condition.
The research shows that rare mutations in the CARD14 gene, when activated by an environmental trigger, can lead to plaque psoriasis. This type of psoriasis accounts for 80 percent of all cases and is characterized by dry, raised, red patches covered with silvery scales that can be itchy and painful.
The new findings also indicate that mutations in CARD14 can be involved in the pustular form of psoriasis and in a debilitating arthritis linked to the psoriasis. The discovery may lead to more effective, targeted therapies for plaque psoriasis and other forms of the disease.
The research is published May 4 in two separate papers in The American Journal of Human Genetics.
“We have searched for almost two decades to find a single gene linked to plaque psoriasis,” says the senior author of both papers, Anne Bowcock, PhD, professor of genetics. “Individually, the rare mutations we have found likely confer a high risk for the disease, and we think they will be important in the search to find new, more effective treatments.”
Although psoriasis has long been thought to be caused by an overactive immune system, the genetic pathway uncovered by the scientists points to defects in the skin as the main culprit of the condition and to immune cells as secondary players.
Now, the researchers want to find out how common the altered pathway is in the different types of psoriasis and in patients with psoriatic arthritis. Their work suggests that in at least some patients with different forms of psoriasis, this pathway is the same.
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