Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0014547 (focal epilepsy)
 1,627 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We characterized an autosomal-recessive syndrome of focal epilepsy, dysarthria, and mild to moderate intellectual disability in a consanguineous Arab-Israeli family associated with subtle cortical thickening. We used multipoint linkage analysis to map the causative mutation to a 3.2 Mb interval within 16p13.3 with a LOD score of 3.86. The linked interval contained 160 genes, many of which were considered to be plausible candidates to harbor the disease-causing mutation. To interrogate the interval in an efficient and unbiased manner, we used targeted sequence enrichment and massively parallel sequencing. By prioritizing unique variants that affected protein translation, a pathogenic mutation was identified in TBC1D24 (p.F251L), a gene of unknown function. It is a member of a large gene family encoding TBC domain proteins with predicted function as Rab GTPase activators. We show that TBC1D24 is expressed early in mouse brain and that TBC1D24 protein is a potent modulator of primary axonal arborization and specification in neuronal cells, consistent with the phenotypic abnormality described.
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PMID:A focal epilepsy and intellectual disability syndrome is due to a mutation in TBC1D24. 2079 91

TBC1D24 is a newly recognized gene in which variations lead to variable clinical phenotypes including drug-resistant epilepsy. We report four patients with novel variants of TBC1D24 demonstrating drug-resistant focal epilepsy, developmental delays, and head growth deceleration. All patients had seizure semiologies consisting of prolonged, unilateral, focal clonic activity of the arm, leg or face, in addition to generalized clonic or myoclonic seizures. Ictal EEG characteristics included epilepsia partialis continua, epilepsy of infancy with migrating focal seizures, and other focal seizures with indiscrete interictal-ictal transitions. Two seemingly unrelated Navajo patients with identical variations experienced super-refractory status epilepticus at 9 months of age, with one achieving resolution with ketogenic diet therapy. Our series suggests that TBC1D24-related epilepsy can manifest with hypotonia, developmental delays, and a variety of focal-onset seizures prone to electroclinical dissociation.
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PMID:Electroclinical phenotypes and outcomes in TBC1D24-related epilepsy. 2750 53