Investigating the Role of cnb-1 and chpf-1 in GABA DD Motor Neuron Remodeling and Synapse Maintenance

项目摘要 在人类大脑的发育过程中，突触连接经历了密集的重新布线，以形成 成熟的电路人类发育重塑的破坏与神经系统疾病有关， 精神分裂症和自闭症谱系障碍。该项目的目标是确定保守的机制， 直接突触重塑遗传学的简单性，再加上更简单的组织和不变式 无脊椎动物神经系统的结构为神经元重塑的研究提供了强大的优势。我 本工作主要研究线虫中GABA能D类运动神经元的重塑 秀丽隐杆线虫以前的研究主要集中在突触前末梢的重塑。在 相比之下，我的初步工作集中在了解直接消除的机制， 突触后受体在重塑过程中。突触后区弗朗西斯实验室先前证明， 同源域转录因子dve-1是GABA神经元中突触消除所必需的。我的工作 主要集中在两个假定的DVE-1靶点，钙调神经磷酸酶样EF-手蛋白CHP 1/chpf-1和调节蛋白 钙调神经蛋白PPP 3R 1/cnb-1的亚基，其在dve-1突变体中被下调。我的初步 研究表明，CNB-1或CHPF-1的突变在重塑期间破坏突触消除。我 拟议的工作将确定cnb-1的功能要求和行动地点，并确定 钙调磷酸酶和蛋白酶体功能对突触消除的贡献（目的1）。在目标2中，我 将定义chpf-1如何促进突触的消除和维持。在目标3中，我将确定其他 通过使用神经元特异性RNA-seq.我的工作将 推进我们对重塑和调节机制的理解，可能为 未来的探索

Project Summary During development of the human brain, synaptic connections undergo intensive rewiring in order to form mature circuits. Disruption of developmental remodeling in humans is linked to neurological disorders such as schizophrenia and autism spectrum disorders. The goal of this project is to identify conserved mechanisms that direct synapse remodeling. The ease of genetics, couple with the simpler organization and invariant architecture of invertebrate nervous systems offer strong advantages for studies of neuronal remodeling. My work focuses on the remodeling of GABAergic dorsal D-class (DD) motor neurons in the nemaode Caenorhabditis elegans. Prior studies have largely focused on the remodeling of presynaptic terminals. In contrast, my preliminary work has focused on understanding mechanisms that direct the elimination of postsynaptic receptors during remodeling. post-synaptic domain. The Francis lab previously demonstrated that the homeodomain transcription factor dve-1 is required for synapse elimination in GABA neurons. My work focuses on two putative DVE-1 targets, the calcineurin-like EF-hand protein CHP1/chpf-1 and the regulatory subunit of CalciNeurin PPP3R1/cnb-1, that were shown to be downregulated in dve-1 mutants. My preliminary studies suggest that mutation of either cnb-1 or chpf-1 disrupt synapse elimination during remodeling. My proposed work will determine the functional requirement and site of action for cnb-1, and identify the contribution of calcineurin phosphatase and proteasomal function to synapse elimination (Aim 1). In Aim 2, I will define how chpf-1 contributes to synapse elimination and maintenance. In Aim 3, I will identify additional potential targets of dve-1 in the remodeling pathway by using neuron-specific RNA-seq. My proposed work will advance our understanding of remodeling and the mechanisms of regulation, potentially providing targets for future exploration.