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JAMA Psychiatry:精神分裂症患者全脑白质连接不完整

2015-11-28 MedSci MedSci原创

精神分裂症患者全脑白质完整性降低很大程度上与精神分裂症的风险基因有关。网络分析显示精神分裂症遗传基因主要与额叶和皮质下区域连接减少相关,表明额叶和皮质下区域白质纤维完整性丢失。白质完整性的减少可能是精神分裂症独立的遗传脆弱性的新标志。



重要性:  精神分裂症患者中构成大脑结构网络的白质连接失去完整性,减少脑区之间信息传递的效率。然而,目前尚不清楚遗传因素在在多大程度上影响白质功能的完整性。

目标:  确定白质完整性与精神分裂症的遗传因素是否关联。

设计,设定和受试者:  70对患精神分裂症的双胞胎和130对匹配的健康控制双胞胎,使用结构方程建模量化遗传因素和环境因素对大脑连接和疾病负担的影响。研究从2008年10月1日开始,在2013年9月30日结束。2013年11月1日-2015年3月30日处理数据。

主要指标:  通过MRI扩散加权成像评估脑结构连接和网络效率,测量FA(fractional anisotropy)和streamlines。

结果:  受试者样本包括30对同卵双胞胎和与之相匹配的72例控制组受试者,40对异卵双胞胎和与之相匹配的58例控制组受试者。全脑FA降低与精神分裂症责任基因增加显著相关(phenotypic correlation −0.25,95%CI -0.38 --0.10,P=0001),83.4%的责任基因为常见基因。

总的来说,8.1%的与全脑FA有关的遗传变异也与精神分裂症责任基因有关。额叶、纹状体、丘脑包含了85.7%的受基因影响的脑区,全脑区域性网络连接(定义为FA加权局部效率)减少。

多元遗传模型显示独立于其他遗传标记如白质容量和皮质厚度,全脑FA与患精神分裂症相关。

结论和意义:  精神分裂症患者全脑白质完整性降低很大程度上与精神分裂症的风险基因有关。网络分析显示精神分裂症遗传基因主要与额叶和皮质下区域连接减少相关,表明额叶和皮质下区域白质纤维完整性丢失。白质完整性的减少可能是精神分裂症独立的遗传脆弱性的新标志。

原文出处

Bohlken MM, Brouwer RM, Mandl RW, et al. Structural Brain Connectivity as a Genetic Marker for Schizophrenia. JAMAPsychiatry. Published online November 25,2015.
 

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