People with the disease appear to have normal psychomotor development during the first 6 to 18 months of life, followed by a developmental "plateau," and then rapid regression in language and motor skills. Rett syndrome is a neurodevelopmental condition that primarily affects girls. The vast majority of cases are not inherited from a parent, but are due to a new genetic change in the affected person. Classic Rett syndrome is most commonly caused by genetic changes in the MECP2 gene and is usually inherited in an X-linked dominant manner. Some people have an atypical form of Rett syndrome that may be more mild or more severe. Additional signs and symptoms may include repetitive, stereotypic hand movements fits of screaming and inconsolable crying autistic features panic-like attacks teeth grinding (bruxism) episodic apnea and/or hyperpnea gait ataxia and apraxia tremors seizures and slowed head growth.
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