Submitted by Catherine Jeans on Thu, 07/10/2008 - 16:57.
Researchers have discovered a mutant gene that causes a rare form of epilepsy in women. Known as epilepsy and mental retardation limited to females (EFMR), the condition is characterised by seizures from around the age of one, with the slowing of development and cognitive impairment, in some cases with severe mental retardation.
The mutant gene, known as PCDH19, was found on the X chromosome of female sufferers. Males can also carry the mutant gene on their X chromosome and pass it onto their children, however they do not suffer from the illness.