Downregulation of the schizophrenia risk-gene Dgcr2 alters early microcircuit development in the mouse medial prefrontal cortex.

Downregulation of the schizophrenia risk-gene Dgcr2 alters early microcircuit development in the mouse medial prefrontal cortex.
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DOI:
10.1002/jdn.10175
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发表时间:
2022-05
影响因子:
1.8
通讯作者:
Dayer, Alexandre
Dayer, Alexandre
中科院分区:
医学4区
文献类型:
--
作者:
Molinard-Chenu, Aude;Godel, Michel;Rey, Alicia;Musardo, Stefano;Bodogan, Timea;Vutskits, Laszlo;Bellone, Camilla;Dayer, Alexandre

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内侧前额叶皮层(mPFC)微回路中不同亚型神经元的产生、迁移和整合的改变可能在精神分裂症易感性中起重要作用。通过对锥体神经元(PNs)祖细胞的体内细胞类型特异性操作,我们旨在研究精神分裂症风险基因Dgcr2在发育小鼠mPFC皮层回路形成中的作用。本报告描述了Dgcr2在上层PNs中的敲低如何影响mPFC中PNs和中间神经元(INs)的功能成熟。首先,我们证明Dgcr2敲低会破坏上层PNs的层流定位、树突形态和兴奋性活性。有趣的是,Dgcr2敲低PNs的抑制活性也发生了改变,表明涉及中间神经元的更广泛的微电路改变。进一步的分析表明,小白蛋白(PV) INs的组织学成熟并没有显著受损,这意味着其他INs亚型可能在报道的微电路改变中起作用。总的来说,本研究揭示了PNs中Dgcr2敲低如何诱导mPFC出生后早期发育的局部功能缺陷。小鼠内侧前额叶皮层锥体神经元中精神分裂症风险基因Dgcr2的敲低会破坏局部微回路的树突发生和电生理成熟。
Alterations in the generation, migration and integration of different subtypes of neurons in the medial prefrontal cortex (mPFC) microcircuit could play an important role in vulnerability to schizophrenia. Using in vivo cell‐type specific manipulation of pyramidal neurons (PNs) progenitors, we aim to investigate the role of the schizophrenia risk‐gene DiGeorge Critical Region 2 (Dgcr2) on cortical circuit formation in the mPFC of developing mice. This report describes how Dgcr2 knock down in upper‐layer PNs impacts the functional maturation of PNs and interneurons (INs) in the mPFC. First, we demonstrate that Dgcr2 knock‐down disrupts laminar positioning, dendritic morphology and excitatory activity of upper‐layer PNs. Interestingly, inhibitory activity is also modified in Dgcr2 knock‐down PNs, suggesting a broader microcircuit alteration involving interneurons. Further analyses show that the histological maturation of parvalbumin (PV) INs is not dramatically impaired, thus implying that other INs subtypes might be at play in the reported microcircuit alteration. Overall, this study unravels how local functional deficits of the early postnatal development of the mPFC can be induced by Dgcr2 knock‐down in PNs. Knock‐down of the schizophrenia risk‐gene Dgcr2 in pyramidal neurons of the medial prefrontal cortex in mice disrupts dendritogenesis and electrophysiological maturation of the local microcircuit.
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