Collins syndrome This condition has an autosomal dominant pattern of inheritance, which means one copy of the altered gene in each cell is sufficient to cause the disorder. About 60 percent of cases result from new mutations in the TCOF1 gene. These cases occur in people with no history of the disorder in their family. In the remaining cases, a person with Treacher Collins syndrome inherits the altered gene from an affected parent. I got this info from http://www.medicinenet.com/treacher_collins_syndrome/page2.htm