What causes Multiple familial trichoepithelioma ?
What causes multiple familial trichoepithelioma? Multiple familial trichoepithelioma is thought to be inherited in an autosomal dominant fashion with reduced penetrance. Autosomal dominant means that a single mutation in one copy of a gene is sufficient to cause the condition. Reduced penetrance means that not everyone with the gene mutation will develop symptoms of the condition. Multiple familial trichoepithelioma can be caused by mutations in the CYLD gene which is found on chromosome 16 or by a mutation on a gene on chromsome 9 that has yet to be identified.