Brain:癫痫、海马硬化及热性惊厥与SCN1A基因相关遗传变异有关

2013-09-26 lilyfighting dxy

癫痫包含多种综合征,其中最常见的是颞叶内侧癫痫伴海马硬化。颞叶内侧癫痫伴海马硬化的痫性发作通常存在耐药性,且常伴随重要的并发症,因此,我们迫切需要寻求对该综合征更深入的理解和更好的治疗方法。颞叶内侧癫痫伴海马硬化的病因尚不明确,然而其与儿童热性惊厥存在关联。SCN1A基因编码了可在脑组织表达的钠通道亚单位,这是许多抗癫痫药物的作用靶点,该基因的变异可导致数种以热性惊厥为特征的更罕见的癫痫。基于此,

癫痫包含多种综合征,其中最常见的是颞叶内侧癫痫伴海马硬化。颞叶内侧癫痫伴海马硬化的痫性发作通常存在耐药性,且常伴随重要的并发症,因此,我们迫切需要寻求对该综合征更深入的理解和更好的治疗方法。颞叶内侧癫痫伴海马硬化的病因尚不明确,然而其与儿童热性惊厥存在关联。SCN1A基因编码了可在脑组织表达的钠通道亚单位,这是许多抗癫痫药物的作用靶点,该基因的变异可导致数种以热性惊厥为特征的更罕见的癫痫。

基于此,来自英国伦敦大学神经病学研究所的Dalia Kasperavičiūtė医学博士等人进行了一项研究,研究结果在线发表于2013年9月6日的《脑》(Brain)杂志中。作者发现颞叶内侧癫痫伴海马硬化与热性惊厥者与SCN1A基因附近常见的遗传变异有关。【原文下载】

该研究为一项全基因组关联研究,作者在1018名颞叶内侧癫痫伴海马硬化的患者与7552名对照者中进行了全基因组关联分析,并在另一单独样本组中进行验证,该样本组包含959名颞叶内侧癫痫伴海马硬化患者与3591名对照者。为了仔细分析与热性惊厥病史相关的变异,作者还检测了颞叶内侧癫痫伴海马硬化且同时存在(总体n=757)与不存在(总体n=803)热性惊厥病史的病例。

研究结果揭示了颞叶内侧癫痫伴海马硬化与热性惊厥者在2q24.3染色体上的钠通道基因簇上,存在全基因组显著关联[即SCN1A基因内含子上的rs7587026, P = 3.36 × 10-9, 优势比 (腺苷酸A) = 1.42, 95%置信区间: 1.26-1.59]。在一组包含172名伴热性惊厥但跟踪观察到13岁仍未发展为癫痫的患者,以及6456名对照者的人群队列中,作者发现rs7587026与热性惊厥之间没有关联。

该研究提示SCN1A基因与该常见的癫痫综合征有关,这为生物学上认识颞叶内侧癫痫伴海马硬化与热性惊厥提供了新的方向,为一些热性惊厥儿童中预后因素及可能的癫痫预防研究开辟了途径。

原文下载

Kasperaviciute D, Catarino CB, Matarin M, Leu C, Novy J, Tostevin A, Leal B, Hessel EV, Hallmann K, Hildebrand MS, Dahl HH, Ryten M, Trabzuni D, Ramasamy A, Alhusaini S, Doherty CP, Dorn T, Hansen J, Krämer G, Steinhoff BJ, Zumsteg D, Duncan S, Kälviäinen RK, Eriksson KJ, Kantanen AM, Pandolfo M, Gruber-Sedlmayr U, Schlachter K, Reinthaler EM, Stogmann E, Zimprich F, Théâtre E, Smith C, O'Brien TJ, Meng Tan K, Petrovski S, Robbiano A, Paravidino R, Zara F, Striano P, Sperling MR, Buono RJ, Hakonarson H, Chaves J, Costa PP, Silva BM, da Silva AM, de Graan PN, Koeleman BP, Becker A, Schoch S, von Lehe M, Reif PS, Rosenow F, Becker F, Weber Y, Lerche H, Rössler K, Buchfelder M, Hamer HM, Kobow K, Coras R, Blumcke I, Scheffer IE, Berkovic SF, Weale ME; UK Brain Expression Consortium, Delanty N, Depondt C, Cavalleri GL, Kunz WS, Sisodiya SM.Epilepsy, hippocampal sclerosis and febrile seizures linked by common genetic variation around SCN1A.Brain. 2013 Sep 6. 

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