Clinical Neuroscience

The methylation status of NKCC1 and KCC2 in the patients with refractory temporal lobe epilepsy

UNAL Yasemin1, KARA Murat2, GENC Fatma3, OZTURK Aslan Dilek1, GÖMCELI Bicer Yasemin3, KAYNAR Taner2, TOSUN Kursad4, KUTLU Gülnihal1

MAY 30, 2019

Clinical Neuroscience - 2019;72(05-06)

DOI: https://doi.org/10.18071/isz.72.0181

Purpose - Methylation is a key epigenetic modification of DNA and regarding its impact on epilepsy, it is argued that “DNA methylation may play an important role in seizure susceptibility and maintenance of the disorder”. DNA methylation status of KCC2 (SCL12A5) and NKCC1 (SCL12A2) associated with refractory temporal lobe epilepsy was investigated in our study. Materials and methods - Thirty-eight patients with temporal lobe epilepsy (TLE) who were diagnosed by video EEG monitoring and 32 healthy control subjects were included in the study. Twenty-three patients in TLE group were men and the remaining 15 were women. Among them, 27 had unilateral temporal focus (9 with right; 18 with left) and 11 patients had bilateral TLE. We analyzed promoter region methylation status of the KCC2 (SCL12A5) and NKCC1 (SCL12A2) genes in the case and control groups. Gene regions of interest were amplified through PCR and sequencing was accomplished with pyro-sequencing. Results - We found a significant relationship between TLE and methylation on the NKCC1. However, there was no association between TLE and methylation on the KCC2 gene. Also, we found no association between right or left and unilateral or bilateral foci of TLE. There was no relationship between TLE and methylation on the NKCC1and KCC2 genes in terms of mesial temporal sclerosis in cranial MRI, head trauma or febrile convulsions. Conclusion - The methylation of NKCC1 can be a mecha­nism of refractory temporal lobe epilepsy. There are limited findings about DNA methylation in TLE. Therefore, further studies with large sample sizes are necessary.

AFFILIATIONS

  1. Department of Neurology, Mugla Sitki Kocman University Faculty of Medicine, Mugla, Turkey
  2. Sitogen Biomedical and Laboratory Systems Industrial Trade Limited Company, Istanbul, Turkey
  3. Department of Neurology, Antalya Research and Training Hospital, Ministry of Health, Antalya, Turkey
  4. Siena College, Loudonville, NY, 12211 USA

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Aim - The purpose of this prospective study was to investigate whether mid-term treatment with oral isotretinoin may impact peripheral nerve function. Methods - In this study, we included 28 patients with no apparent neurological or neurophysiological findings. The patients received treatment with oral isotretinoin for papulopustular or nodulocystic acne. The patients with normal findings in the first examination were given 1 mg/kg/day oral isotretinoin. Neurological examinations and electroneurographic studies were performed before and 6 months after the onset of isotretinoin treatment. Results - Clinical examinations and electroneurographic evaluations prior to treatment revealed no abnormalities in any of the patients. However, 20 patients (72%) displayed one or more abnormal values in the tested parameters after treatment. Although the mean amplitudes of compound muscle action potential of the ulnar and median nerves did not vary, significant decreases were observed in the mean sensory conduction velocities of median, ulnar, sural, medial plantar, medial dorsal cutaneous, and dorsal sural nerves 6 months after the onset of treatment. Conclusion - Systemic use of isotretinoin may cause electroneurographic changes. Probable electroneurographic alterations may be detected at a much earlier period via dorsal sural nerve tracing when electrophysiological methods used in routine clinical practice cannot detect these changes.

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Clinical Neuroscience

[In memoriam Mátyás Papp]

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[Mátyás Papp died on 4th of April, 2019, at the age of 92, following a long disease. He was working for nearly 60 years in the Department of Neurology, Semmelweis University. He was known about his works on the inclusion bodies in multiple system atrophy (Papp-Lantos bodies). He was a honorary member of the International Society of Neuropathology. ]

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