- Variations in the dopamine beta-hydroxylase gene are not associated with the autonomic disorders, pure autonomic failure, or multiple system atrophy. Cho, S., Kim, C.H., Cubells, J.F., Zabetian, C.P., Hwang, D.Y., Kim, J.W., Cohen, B.M., Biaggioni, I., Robertson, D., Kim, K.S. Am. J. Med. Genet. A (2003)









