ood. these forms are very rare. sandhoff disease is caused by mutations in the hexb gene. these mutations cause a deficiency of the enzyme beta-hexosaminidase, which results in the accumulation of certain fats (lipids) in the brain and other organs of the body. sandhoff disease is inherited in an autosomal recessive manner. last updated: 10/19/2011Wikipedia:64 Sandhoff disease, also known as Sandh