rett syndrome is a rare genetic neurological disorder that predominantly affects females. it is caused by a randomly occurring mutation in the mecp2 gene.
children who develop rett syndrome generally start to show symptoms around one to two years of age, but they often appear completely healthy in the first six months of life.
when the signs of rett syndrome begin to develop, such as slowed development, loss of movement and communication, and unusual hand movements, it can be hard to discern between “normal” infant behaviours and disease characteristics. because of this, and because it’s rare—there are only 600 to 900 cases in canada—diagnosing rett syndrome can be a challenge.
dr. laura mcadam, a pediatrician at holland bloorview kids rehabilitation hospital in toronto, ontario, works in the rett syndrome clinic and sees how difficult it can be to reach a diagnosis for parents who have children living with the disease.
“the challenge with rett syndrome (is that) children are developing, and so that means they’re gaining skills. they’re sitting, they’re interacting, they can be talking, and then at some point in time, their development, usually within 18 months to two years of age, there’s this slowing of the gaining of these developmental skills,” she said. “then, they hit a period of time where they regress, and they lose some of the skills they have already gained.”