Pathogenic Variants in PIGG Cause Intellectual Disability with Seizures and Hypotonia

De novo variants in EBF3 are associated with hypotonia, developmental delay, intellectual disability, and autism

Using whole-exome sequencing, we identified seven unrelated individuals with global developmental delay, hypotonia, dysmorphic facial features, and an increased frequency of short stature, ataxia, and autism with de novo heterozygous frameshift, nonsense, splice, and missense variants in the Early B-cell Transcription Factor Family Member 3 (EBF3) gene. EBF3 is a member of the collier/olfactory...

Biallelic Mutations in UNC80 Cause Persistent Hypotonia, Encephalopathy, Growth Retardation, and Severe Intellectual Disability.

Ion channel proteins are required for both the establishment of resting membrane potentials and the generation of action potentials. Hundreds of mutations in genes encoding voltage-gated ion channels responsible for action potential generation have been found to cause severe neurological diseases. In contrast, the roles of voltage-independent "leak" channels, important for the establishment and...

SPATA5 mutations cause a distinct autosomal recessive phenotype of intellectual disability, hypotonia and hearing loss

We examined an extended, consanguineous family with seven individuals with severe intellectual disability and microcephaly. Further symptoms were hearing loss, vision impairment, gastrointestinal disturbances, and slow and asymmetric waves in the EEG. Linkage analysis followed by exome sequencing revealed a homozygous variant in SPATA5 (c.1822_1824del; p.Asp608del), which segregates with the ph...

Zellweger syndrome: A cause of neonatal hypotonia and seizures.

Zellweger syndrome, a paradigm of human peroxisomal disorders is characterized by dysmorphic features, hypotonia, severe neuro-developmental delay, hepatomegaly, renal cysts, sensorineural deafness and retinal dysfunction. This is a case report of a baby boy born with facial dysmorphism, profound hypotonia, seizures, and hepatomegaly. The diagnosis was not evident initially but only later when ...

Do seizures in children cause intellectual deterioration.