title: Screening LGI1 in a cohort of 26 lateral temporal lobe epilepsy patients with auditory aura from Turkey detects a novel de novo mutation.
abstract: Autosomal dominant lateral temporal lobe epilepsy (ADLTE) is an autosomal dominant epileptic syndrome characterized by focal seizures with auditory or aphasic symptoms. The same phenotype is also observed in a sporadic form of lateral temporal lobe epilepsy (LTLE), namely idiopathic partial epilepsy with auditory features (IPEAF). Heterozygous mutations in LGI1 account for up to 50% of ADLTE families and only rarely observed in IPEAF cases. In this study, we analysed a cohort of 26 individuals with LTLE diagnosed according to the following criteria: focal epilepsy with auditory aura and absence of cerebral lesions on brain MRI. All patients underwent clinical, neuroradiological and electroencephalography examinations and afterwards they were screened for mutations in LGI1 gene. The single LGI1 mutation identified in this study is a novel missense variant (NM_005097.2: c.1013T>C; p.Phe338Ser) observed de novo in a sporadic patient. This is the first study involving clinical analysis of a LTLE cohort from Turkey and genetic contribution of LGI1 to ADLTE phenotype. Identification of rare LGI1 gene mutations in sporadic cases supports diagnosis as ADTLE and draws attention to potential familial clustering of ADTLE in suggestive generations, which is especially important for genetic counselling.
authors.affiliation: Istanbul University, Institute of Experimental Medicine, Department of Genetics, Istanbul, Turkey.
authors.forename: Yesim F
authors.initials: YF
authors.lastname: Kesim
authors.affiliation: Istanbul University, Istanbul Faculty of Medicine, Department of Neurology, Clinical Neurophysiology Unit, Istanbul, Turkey.
authors.forename: Gunes Altiokka
authors.initials: GA
authors.lastname: Uzun
authors.affiliation: Istanbul University, Institute of Experimental Medicine, Department of Genetics, Istanbul, Turkey.
authors.forename: Emrah
authors.initials: E
authors.lastname: Yucesan
authors.affiliation: Istanbul University, Institute of Experimental Medicine, Department of Genetics, Istanbul, Turkey.
authors.forename: Feyza N
authors.initials: FN
authors.lastname: Tuncer
authors.affiliation: Istanbul University, Institute of Experimental Medicine, Department of Genetics, Istanbul, Turkey.
authors.forename: Ozkan
authors.initials: O
authors.lastname: Ozdemir
authors.affiliation: Istanbul University, Istanbul Faculty of Medicine, Department of Neurology, Clinical Neurophysiology Unit, Istanbul, Turkey.
authors.forename: Nerses
authors.initials: N
authors.lastname: Bebek
authors.affiliation: Istanbul University, Institute of Experimental Medicine, Department of Genetics, Istanbul, Turkey.
authors.forename: Ugur
authors.initials: U
authors.lastname: Ozbek
authors.affiliation: Istanbul University, Institute of Experimental Medicine, Department of Genetics, Istanbul, Turkey. Electronic address: sibel.ugur@istanbul.edu.tr.
authors.forename: Sibel A Ugur
authors.initials: SA
authors.lastname: Iseri
authors.affiliation: Istanbul University, Istanbul Faculty of Medicine, Department of Neurology, Clinical Neurophysiology Unit, Istanbul, Turkey.
authors.forename: Betul
authors.initials: B
authors.lastname: Baykan
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D015331:Cohort Studies; D004252:DNA Mutational Analysis; D004833:Epilepsy, Temporal Lobe / Q000175:diagnosis / Q000235:genetics* / Q000503:physiopathology; D005260:Female; D005820:Genetic Testing; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D011506:Proteins / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D014421:Turkey
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; C116499:LGI1 protein, human; D011506:Proteins
keywords: Auditory aura; Autosomal Dominant Lateral Temporal Epilepsy (ADLTE); De novo Mutation; Idiopathic Partial Epilepsy with Auditory Features (IPEAF); LGI1; Lateral temporal lobe epilepsy (LTLE)