CMT is an inherited disease and we all have two copies of all genes one from each parent. “Some forms of CMT are inherited in an autosomal dominant fashion, which means only one copy of the abnormal gene is needed to cause the disease. The other form of CMT are inherited in an autosomal recessive fashion, which means that both copies of the abnormal gene must be present to cause that disease. Still other forms of CMT are inherited in an X-link fashion, which means that the abnormal is located on the X chromosome.” (291, Judd) They also say that in some rare cases that a new mutation happens to the gene and it wasn’t passed down through the family.
