Researchers in Australia have found that a rare mutation in kidney genes may be related to OCD:
"Australia's researchers have found gene mutations which cause a rare kidney disease may also be involved in obsessive compulsive disorder (OCD), the Australian Associated Press reported on Wednesday.
Researchers from the Centenary Institute in Sydney have now identified mutations that stop the gene working properly in the kidneys, and suspect these same mutations are also involved in OCD.
They hope to develop their findings into a simple urine test that can allow earlier diagnosis of children with OCD, also known as debilitating mental disorder."
Read More: http://news.xinhuanet.com/english2010/health/2011-01/05/c_13677275.htm