Recessive mutations in SLC35A3 cause early onset epileptic encephalopathy with skeletal defects.
Publication Title
American journal of medical genetics. Part A
Document Type
Article
Publication Date
4-1-2017
Keywords
Arthrogryposis; Bone and Bones; Child; Electroencephalography; Female; Gene Expression; Glycosylation; Heterozygote; Humans; Intellectual Disability; Male; Microcephaly; Mutation; Nucleotide Transport Proteins; Quadriplegia; Siblings; Spasms, Infantile
Abstract
We describe the clinical and whole genome sequencing (WGS) study of a non-consanguineous Italian family in which two siblings, a boy and a girl, manifesting a severe epileptic encephalopathy (EE) with skeletal abnormalities, carried novel SLC35A3 compound heterozygous mutations. Both siblings exhibited infantile spasms, associated with focal, and tonic vibratory seizures from early infancy. EEG recordings showed a suppression-burst (SB) pattern and multifocal paroxysmal activity in both. In addition both had quadriplegia, acquired microcephaly, and severe intellectual disability. General examination showed distal arthrogryposis predominant in the hands in both siblings and severe left dorso-lumbar convex scoliosis in one. WGS of the siblings-parents quartet identified novel compound heterozygous mutations in SLC35A3 in both children. SLC35A3 encodes the major Golgi uridine diphosphate N-acetylglucosamine transporter. With this study, we add SLC35A3 to the gene list of epilepsies. Neurological symptoms and skeletal abnormalities might result from impaired glycosylation of proteins involved in normal development and function of the central nervous system and skeletal apparatus.
Area of Special Interest
Neurosciences (Brain & Spine)
Specialty/Research Institute
Institute for Systems Biology
Specialty/Research Institute
Neurosciences
