MedGen

MRT18 is an autosomal recessive disorder characterized by impaired intellectual development with or without epilepsy. Other features may include spasticity, congenital heart disease, brain abnormalities, and atypical electroencephalography (summary by Trehan et al., 2015). [from OMIM]

When an activity, substance, object, or behavior becomes a major focus of a person's life, excluding other activities, or has begun to harm the individual or others physically, mentally, or socially, it can be considered addictive behavior. A person can become addicted or compulsively engaged with anything. [from HPO]