Genetic variability in glutamic acid decarboxylase genes: associations with post-traumatic seizures after severe TBI.

Genetic variability in glutamic acid decarboxylase genes: associations with post-traumatic seizures after severe TBI.
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DOI:
10.1016/j.eplepsyres.2012.07.006
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发表时间:
2013-02
期刊:
影响因子:
2.2
通讯作者:
Wagner AK
Wagner AK
中科院分区:
医学4区
文献类型:
--
作者:
Darrah SD;Miller MA;Ren D;Hoh NZ;Scanlon JM;Conley YP;Wagner AK

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创伤后癫痫发作 (PTS) 经常发生在创伤性脑损伤 (TBI) 后。由于γ-氨基丁酸 (GABA) 神经传递对于多种模型的兴奋性毒性和癫痫发作发展至关重要,因此我们研究了谷氨酸脱羧酶 (GAD) 的遗传变异如何影响 PTS 的风险。使用标记和功能性单核苷酸多态性 (SNP) 方法,我们对 GAD1 和 GAD2 基因进行了基因分型,并将它们与从 257 名患有严重 TBI 的成年受试者获得的有关首次癫痫发作时间的 PTS 数据联系起来。未发现 GAD2 存在显着关联。在 GAD1 基因中,标记 SNP (tSNP) rs3828275 与 <1 周内发生 PTS 的风险增加相关。 GAD1 基因中的 tSNP rs769391 和功能性 SNP rs3791878 与损伤后 1 周至 6 个月发生的 PTS 风险增加相关。与具有 0-1 风险变异的受试者相比,两种风险变异都增加了对 PTS 的易感性。此外,那些具有两种风险变异的单倍型的人在受伤后 1 周至 6 个月内比不具有这些单倍型的人具有更高的 PTS 风险。同样,双倍型分析显示,拥有 2 个包含两个风险等位基因的单倍型拷贝的人处于最高的 PTS 风险。这些结果表明 GABA 系统内的遗传变异在调节 PTS 的发展中。
Post traumatic seizures (PTS) occur frequently after traumatic brain injury (TBI). Since gamma-amino butyric acid (GABA) neurotransmission is central to excitotoxicity and seizure development across multiple models, we investigated how genetic variability for glutamic acid decarboxylase (GAD) influences risk for PTS. Using both a tagging and functional single nucleotide polymorphism (SNP) approach, we genotyped the GAD1 and GAD2 genes and linked them with PTS data, regarding time to first seizure, obtained for 257 adult subjects with severe TBI. No significant associations were found for GAD2. In the GAD1 gene, the tagging SNP (tSNP) rs3828275 was associated with an increased risk for PTS occurring <1wk. The tSNP rs769391and the functional SNP rs3791878 in the GAD1 gene were associated with increased PTS risk occurring 1wk-6mo post-injury. Both risk variants conferred an increased susceptibility to PTS compared to subjects with 0-1 risk variant. Also, those with haplotypes having both risk variants had a higher PTS risk 1wk-6mo post-injury than those without these haplotypes. Similarly, diplotype analysis showed those with 2 copies of the haplotype containing both risk alleles were at the highest PTS risk. These results implicate genetic variability within the GABA system in modulating the development of PTS.
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