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    Preliminary study about a significant and treatable cause of epileptic encephalopathy: GRIN2D mutation
    (2021) Kutluk, Gültekin; Randa, Nadide Cemre
    Aim: The GRIN2D gene mutation causes severe forms of epileptic encephalopathy. NMDAR antagonists and magnesium sulfate could be useful as adjunctive therapy to control seizures in individuals with GRIN2D encephalopathy. The aim of this study was to describe the clinical features and treatment options of GRIN2D encephalopathy. Methods: Patients followed up with epileptic encephalopathy in our pediatric neurology clinic were investigated for genetic etiology using next-generation sequencing (NGS)-based tests. Patients with the GRIN2D mutation were overviewed for clinical and genetic characteristics. Results: A total of 53 patients were screened and GRIN2D mutations (c.3684_3685insGA, c.3248_3254del, c.1579G>T, c.47_49del) were detected in four patients. Occipital epileptic activity was frequently detected among our patients. Three patients received memantine treatment for intractable epilepsy and remained seizure-free. Conclusion: GRIN2D encephalopathy is a treatable epileptic encephalopathy, and its recognition is important in terms of outcomes. Occipital epilepsy is generally benign, but developmental and epileptic encephalopathies such as GRIN2D encephalopathy should be considered in the presence of concomitant developmental delay.
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    The pitt-hopkins syndrome: Report of 5 patients and literature comparison
    (2021) Kutluk, Gültekin; Kadem, Elif Naz; Randa, Nadide Cemre; Öz, Ayşe
    Pitt-Hopkins syndrome (PTHS) is characterized by developmental delay, intellectual disability and behavioral changes, distinctive facial gestalt, and breathing abnormalities. PTHS is caused by deletions or pathological variants in the TCF4 gene located at 18q21.2. In this report, we aimed to describe the clinical and genetic findings of patients diagnosed with PTHS and compare our patients with the literature. Patients who were followed up with severe intellectual disability and a variable association of features previously described as characteristic of the PTHS phenotype in the pediatric neurology clinic of Antalya Training and Research Hospital were screened for TCF4 mutations using next-generation sequencing (NGS)-based tests, between 2017 and 2020. A genetic mutation associated with PTHS was detected in five patients. This paper emphasis on mutational and clinical spectrum of PTHS and its significant part in the differential diagnosis of severe mental retardation