Symptoms of DHMN2 usually begin from the age of 10 to the middle of adulthood. Early signs of this disorder include clogging or weakness in the muscles of the toe and the next, the whole leg. The DHMN2 syndrome is caused by the mutation of the HSPB1 gene, which is positioned in the long arm of chromosome 7 as 7q11.23, and the HSPB8 gene, which is based on the long arm of chromosome 12, is 12q24.23.