Non-specific X-linked mental retardation is a heterogeneous group of disorders with an incidence of approximately 1 in 500 males. A recently identified gene in Xq12, encoding a Rho-GTPase-activating protein, was found to be mutated in individuals with mental retardation. We describe here two sisters
BACKGROUND
Glucose transporter type 1 deficiency syndrome (GLUT1 DS) is caused by impaired glucose transport across the blood-brain barrier and commonly presents as severe early onset epilepsy, developmental delay, and movement abnormalities. In rare instances, GLUT1 DS can present as a paroxysmal
A progressive neurological condition characterised by megalencephaly, spasticity, ataxia and seizures in two siblings of consanguineous parents is described. The electroencephalogram showed posterior discharges and an unusual photoparoxysmal response whereas brainstem auditory evoked potential
We report on a girl, born to first-cousin Lebanese parents, with severe intellectual disability, congenital hip luxation, cardiac malformation, short stature, facial dysmorphic features including microcephaly, sparse hair, bilateral epicanthal folds, ataxia, seizures, and elevated lactate and
Bovine familial convulsion and ataxia, a heritable disorder, is present in crossbred Aberdeen Angus cattle in western Canada. Though the prevalence appears to be low, this genetic defect might become widespread if not controlled. Characteristic histological lesions were seen in the lingula, uvula,
CACNA2D2 is a putative tumor suppressor gene located in the human chromosome 3p21.3 region that shows frequent allelic imbalances in lung, breast, and other cancers. The alpha2delta-2 protein encoded by the gene is a regulatory subunit of voltage-dependent calcium channels and is expressed in brain,
Tottering and leaner, two mutations of the mouse tottering locus, have been studied extensively as models for human epilepsy. Here we describe the isolation, mapping, and expression analysis of Cacnl1a4, a gene encoding the alpha subunit of a proposed P-type calcium channel, and also report the
Prominent neurological abnormalities, including myoclonus, seizures, ataxia, and hearing loss, have been noted in juvenile-onset biotin-responsive MCD. The underlying defect in many of these patients, who generally present in the first year of life, appears to be a deficiency of biotinidase. We have
BACKGROUND
Transporters, ion pumps, and ion channels are membrane proteins that regulate selective permeability and maintain ionic gradients across cell membranes. Mutations in CACNA1A encoding a neuronal calcium channel and ATP1A2 encoding an ion pump cause episodic ataxia, hemiplegic migraine, and
Sialidosis is an autosomal recessive lysosomal storage disease caused by pathogenic variants in NEU1 which encodes lysosomal sialidase (neuraminidase 1). Lysosomal neuraminidase catalyzes the removal of terminal sialic acid molecules from glycolipids, glycoproteins and oligosaccharides. Sialidosis
We present a case of a 4-year-old previously healthy child who had a possible first-time seizure at home, and upon a second Emergency Department evaluation was found to have gross cerebellar ataxia suggestive of acute stroke. Initial computed tomography scan and metabolic work-up were unrevealing.
OBJECTIVE
To describe the histopathological lesions of a new canine disease characterised by progressive ataxia, head tremor and seizures, and to deduce the cause of the lesions.
METHODS
Formalin-fixed tissues were processed into paraffin wax and epoxy resin for light and transmission electron
Ca2+ channel beta subunits regulate voltage-dependent calcium currents through direct interaction with alpha 1 subunits. The beta- and alpha 1-binding motifs are conserved, and all beta subunits can stimulate current amplitude, voltage dependence, and kinetics when coexpressed with various alpha 1
SNAP25 is a core component of the soluble N-ethylmaleimide-sensitive factor attachment receptor complex, which plays a critical role in synaptic vesicle exocytosis. To date, six de novo SNAP25 mutations have been reported in patients with neurological features including seizures, intellectual
Biotinidase deficiency is the primary biochemical defect in late-onset multiple carboxylase deficiency and an autosomal recessive disorder and characterized by seizures, ataxia, alopecia and skin rash. We describe a colorimetric semiquantitative method for screening for biotinidase activity from
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