Scientists say they’ve identified the first gene directly linked to the most common form of psoriasis, known as plaque psoriasis. “We have searched for almost two decades to find a single gene linked to plaque psoriasis,” study senior author Anne Bowcock, professor of genetics at Washington University School of Medicine in St. Louis, said in a university news release. “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.”