Conditions

r

Restrictive and Repetitive Behavior

One of the hallmark features of an autism spectrum disorder is the presence of restrictive and repetitive behaviors (RRBs), interests, and activities. Individuals may engage in stereotyped and repetitive motor movements (e.g., hand flapping or lining up items) or speech (e.g., echolalia). They may...

Rett Syndrome

Unlike females, who have two X-chromosomes, males have an X and a Y chromosome. Because males lack a "backup" copy of the X chromosome that can compensate for a defective one, mutations in MECP2 are lethal to the male fetus. This is why RS is found overwhelmingly in females. Rett Syndrome occurs in...