Asparagine-dependent glycosylation 11-congenital disorders of glycosylation (ALG11-CDG) is a rare autosomal recessive N-glycosylation defect with multisystem involvement particularly neurological symptoms such as epilepsy and neuromotor developmental delay. A 31-month-old male patient admitted to our center with complaints of axial hypotonia, drug-resistant myoclonic seizures, microcephaly and deafness. […]Compound heterozygous mutations of the ALG11 gene were found by whole exome sequencing (WES) analysis. It was determined that the c.476T>C mutation is a novel mutation.