| Phenotype details |
severe intellectual disability; onset congenital; 6w-normal hearing, 7m-hearing loss (7m 70 db, 3y 0 db); facial dysmorphism; motor development 6m-head control, 5y-sitting, 8y-autonomous wheelchair; simple sign language and scribbling; congenital strabismus, optic atrophy; 10m-dystonia; 8y-seizures; pyramidal signs, paraplegia, unexplained episodic fever, hyperactivity; failure to thrive, intrauterine growth delay; <3y-weight -3 SD, height -3 SD; >3y-weight -2 SD, height -2 SD; 2m-microcephaly (-3 SD), 2y-microcephaly (-2 SD); MRI brain 5.6y-periventricular hypomyelination; no atrophy |