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Functional Dysconnectivity in Ventral Striatocortical Systems in 22q11.2 Deletion Syndrome
Schizophrenia Bulletin ( IF 5.3 ) Pub Date : 2021-12-21 , DOI: 10.1093/schbul/sbab139
Ángeles Tepper 1 , Analía Cuiza 1 , Luz María Alliende 1 , Carlos Mena 1, 2 , Juan Pablo Ramirez-Mahaluf 1 , Barbara Iruretagoyena 1, 3 , Claudia Ornstein 4 , Rosemarie Fritsch 4 , Ruben Nachar 5, 6 , Alfonso González-Valderrama 5, 6 , Juan Undurraga 3, 5 , Juan Pablo Cruz 7 , Cristian Tejos 8, 9, 10 , Alex Fornito 11 , Gabriela Repetto 12 , Nicolas Crossley 1, 9, 10
Affiliation  

Abstract
22q11.2 deletion syndrome (22q11.2DS) is a genetic neurodevelopmental disorder that represents one of the greatest known risk factors for psychosis. Previous studies in psychotic subjects without the deletion have identified a dopaminergic dysfunction in striatal regions, and dysconnectivity of striatocortical systems, as an important mechanism in the emergence of psychosis. Here, we used resting-state functional MRI to examine striatocortical functional connectivity in 22q11.2DS patients. We used a 2 × 2 factorial design including 125 subjects (55 healthy controls, 28 22q11.2DS patients without a history of psychosis, 10 22q11.2DS patients with a history of psychosis, and 32 subjects with a history of psychosis without the deletion), allowing us to identify network effects related to the deletion and to the presence of psychosis. In line with previous results from psychotic patients without 22q11.2DS, we found that there was a dorsal to ventral gradient of hypo- to hyperstriatocortical connectivity related to psychosis across both patient groups. The 22q11.2DS was additionally associated with abnormal functional connectivity in ventral striatocortical networks, with no significant differences identified in the dorsal system. Abnormalities in the ventral striatocortical system observed in these individuals with high genetic risk to psychosis may thus reflect a marker of illness risk.


中文翻译:

22q11.2 缺失综合征腹侧纹状体皮质系统的功能性连接异常

摘要
22q11.2 缺失综合征 (22q11.2DS) 是一种遗传性神经发育障碍,是已知的精神病最大危险因素之一。先前对没有缺失的精神病患者的研究已经确定纹状体区域的多巴胺能功能障碍和纹状皮质系统的连接异常是精神病出现的重要机制。在这里,我们使用静息态功能 MRI 检查 22q11.2DS 患者的纹状皮质功能连接。我们使用 2 × 2 析因设计,包括 125 名受试者(55 名健康对照、28 名无精神病史的 22q11.2DS 患者、10 名有精神病史的 22q11.2DS 患者和 32 名有精神病史但未删除的受试者) ,使我们能够识别与缺失和精神病存在相关的网络效应。与没有 22q11.2DS 的精神病患者的先前结果一致,我们发现在两个患者组中都存在与精神病相关的低纹状体皮质连接到高纹状皮质连接的背侧到腹侧梯度。22q11.2DS 还与腹侧纹状皮质网络中的异常功能连接相关,而在背侧系统中未发现显着差异。因此,在这些具有精神病高遗传风险的个体中观察到的腹侧纹状皮质系统异常可能反映了疾病风险的标志。2DS 还与腹侧纹状皮质网络中的异常功能连接相关,而在背侧系统中没有发现显着差异。因此,在这些具有精神病高遗传风险的个体中观察到的腹侧纹状皮质系统异常可能反映了疾病风险的标志。2DS 还与腹侧纹状皮质网络中的异常功能连接相关,而在背侧系统中没有发现显着差异。因此,在这些具有精神病高遗传风险的个体中观察到的腹侧纹状皮质系统异常可能反映了疾病风险的标志。
更新日期:2021-12-21
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