核心要点
- 问题/背景
- 这篇 Nature 论文研究发育关键期中，环境经验如何从细胞类型和基因调控层面限制神经可塑性。
- 方法/机制
- 作者在小鼠 primary visual cortex 发育过程中结合单细胞转录组和 chromatin accessibility sequencing，解析不同皮层细胞类型随视觉经验成熟的 activity-dependent gene programs。
- 结果/证据
- 关键发现是光照经验通过 astrocyte 中 glucocorticoid receptor 的染色质招募推动星形胶质细胞成熟，激活部分在人脑发育中保守的调控程序，并促进限制神经可塑性/关闭关键期的成熟过程。
- 收录价值
- 它值得收录，因为它把经验、胶质细胞成熟、激素受体信号、染色质调控和神经可塑性边界连接起来，对理解学习窗口、可塑性-稳定性权衡和生物系统如何从高可塑状态转向稳定状态有核心机制意义。
原始摘要与中文对照
中文对照翻译
感觉经验在出生后发育的关键期完善神经网络。尽管已知神经元活动能协调这一过程背后的电路连接，但随着动物成熟而限制发育可塑性的环境线索尚不清楚。在这里，我们使用配对的单细胞转录组和染色质可及性测序，研究了小鼠初级视皮层在出生后发育过程中经验依赖性的成熟。除了识别出每种皮层细胞类型中出现的活动依赖性基因程序外，我们还发现光照通过细胞类型特异性地招募糖皮质激素受体（由Nr3c1编码）到染色质，从而驱动星形胶质细胞的成熟。星形胶质细胞糖皮质激素受体信号传导激活了一个广泛的基因调控程序，该程序在人类大脑发育中部分保守，并促进可能调节关键期关闭的成熟过程。综上所述，这些发现揭示了星形胶质细胞糖皮质激素受体信号传导限制了神经元可塑性。糖皮质激素对星形胶质细胞成熟的调节也可能导致早期生活压力对大脑的影响，而这一过程的破坏可能会增加对神经精神疾病的易感性。
原始摘要
Sensory experience refines neural circuits during critical periods of postnatal development . Although neuronal activity is known to orchestrate the circuit wiring that underlies this process , the environmental cues that restrain developmental plasticity as animals mature are less clear. Here we examine the experience-dependent maturation of the mouse primary visual cortex across postnatal development using paired single-cell transcriptomic and chromatin accessibility sequencing. In addition to identifying the activity-dependent gene programs that emerge within each cortical cell type, we find that light exposure drives astrocyte maturation through cell-type-specific recruitment of the glucocorticoid receptor (encoded by Nr3c1 ) to chromatin. Astrocyte glucocorticoid receptor signalling activates an extensive gene regulatory program that is partially conserved in human brain development and promotes maturation processes that may regulate critical period closure. Collectively, these findings reveal that astrocyte glucocorticoid receptor signalling restricts neuronal plasticity. Glucocorticoid regulation of astrocyte maturation may also contribute to the effects of early-life stress across the brain, and the disruption of this process may increase susceptibility to neuropsychiatric disease.