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Yıl:2019; Cilt: 6; Sayı: 1>> Özet
TAM METİN
The Journal of Neurobehavioral Sciences; 2019;6(1):49-53
Dravet sendromunda SCN1a geni mutasyonlarının hipokampal NA v 1.1 sodyum kanalları üzerine etkisi
H Doğangüneş, BA Arslan
Üsküdar Üniversitesi, İstanbul
Voltaj kapılı sodyum kanalları, nöronlar gibi uyarılabilir hücrelerde aksiyon potansiyelini oluşturan temel birimlerdir ve bu kanallar tipik olarak kanalın daha büyük merkezi gözeneklerini oluşturan bir alfa-alt biriminden, kanal fonksiyonlarını düzenleyen iki daha küçük yardımcı-alt-biriminden oluşan entegre olmuş zar proteinleridir. Nöronal voltaj kapılı sodyum iyonu kanalı tip 1 (NaV1.1) α-alt birimini kodlayan SCN1A genindeki genetik değişimler, Dravet sendromunda görülmektedir. Dravet sendromu, geleneksel tedavilerde sıklıkla dirençli olan çoklu nöbet tiplerine sahip epileptik ensefalopatidir. Epilepsiyle alakalı genler arasında SCN1A belki de en fazla sayıda hastalıkla ilişkili allellere sahip olduğu bilinmektedir. Dravet Sendromu mutasyonlarının birincil etkisinin GABAerjik inhibitör nöronların aktivitesini azaltması olduğunu düşünülmektedir. İnhibitör devrenin azalan aktivitesi, Dravet Sendromu hastalarında nöbet oluşumuna katkıda bulunan önemli bir faktör olabilir ve SCN1A mutasyonlarının genel bir sonucu olabilir.
Impact of SCN1a gene mutations on hippocampal na v1.1 sodium channels in Dravet syndrome
Voltage gated sodium channels are the basic units of action potential in excitable cells such as neurons and these channels are typically integrated membrane proteins consisting of two smaller auxiliary subunits that regulate channel functions and from an alpha-subunit that comprise the larger central pores of the channel. Genetic changes in the SCN1A gene encoding the neuronal voltage-gated sodium ion channel type 1 (Na V 1.1) a-subunit are seen in Dravet syndrome. Dravet syndrome is an epileptic encephalopathy with multiple types of seizures that are often resistant to conventional therapies. Among genes related to epilepsy, SCN1A is known to have perhaps the largest number of allelles associated with the disease. The primary effect of Dravet Syndrome mutations is thought to be to reduce the activity of GABAergic inhibitor neurons. Decreased activity of the inhibitor cycle may be an important contributing factor to seizure formation in Dravet Syndrome patients and may be a general consequence of SCN1A mutations.

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