Linking neuronal identity transcription factors to neural circuit establishment and maintenance

将神经元身份转录因子与神经回路的建立和维护联系起来

• 批准号: 10386149
• 负责人: Kristen M Lee
• 金额: $ 6.98万
• 依托单位: UNIVERSITY OF OREGON
• 依托单位国家: 美国
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-05-01 至 2025-04-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10386149
• 关键词: Address; Adult; Affect; Aging; Attention deficit hyperactivity disorder; Axon; Biological Assay; Biological Metamorphosis; Brain; Caenorhabditis elegans; Cell surface; Cognition; Complex; Coupled; Data; Defect; Dendrites; Development; Developmental Process; Drosophila genus; Drug abuse; Embryo; Esthesia; Event; Foundations; Gene Expression; Gilles de la Tourette syndrome; Goals; Hormones; Individual; Interneurons; Larva; Lead; Learning; Life; Link; Locomotion; Maintenance; Mammals; Membrane; Mental disorders; Modeling; Molecular; Molecular Profiling; Morphology; Motor; Movement; Neuraxis; Neurites; Neurodevelopmental Disorder; Neuronal Plasticity; Neurons; Neurotransmitters; Outcome; Phenotype; Property; Puberty; RNA interference screen; Risk; Role; Schizophrenia; Shapes; Sleep; Specific qualifier value; Synapses; System; Testing; Therapeutic; Walking; Work; autism spectrum disorder; behavioral phenotyping; experimental study; fly; homeodomain; interest; molecular marker; neural circuit; neural patterning; neurogenesis; neuromechanism; optogenetics; relating to nervous system; response; transcription factor

PROJECT SUMMARY/ABSTRACT Neuronal identity is generated during development, with identity characterized by neuron-specific gene expression, axon/dendrite morphology, and connectivity. Homeodomain transcription factors (TFs) are required for establishing gene expression and neuronal morphology, but whether they are required for neuronal connectivity is unknown. Understanding the developmental processes generating neuronal identity in general, and connectivity in particular, is essential for understanding brain assembly and function. An attractive model is that homeodomain TFs – known to regulate neuronal molecular and morphological identity – also facilitate the expression of cell surface molecules that allow the formation of highly-specific neural connections. Connections between individual neurons contribute to neural circuits, which allow sensation, movement and cognition. Proper circuit function throughout life relies on continued circuit remodeling, both synaptically and structurally. Interestingly, homeodomain TFs are expressed in adult neurons, well after neuronal identity has been established. I hypothesize that the homeodomain TFs are required for neural circuit establishment and maintenance throughout life. To test this, I have performed a systematic screen for homeodomain TFs required for the function of a locomotor neural circuit in Drosophila, the Moonwalker Descending Neuron (MDN) and Pair1 circuit. I have identified 16 homeodomain TFs required for MDN or Pair1 optogenetic induced locomotion. In Aim 1, I will test how these 16 homeodomain TFs contribute to neuronal identity by assaying molecular identity, axon/dendrite morphology, and connectivity. My pilot experiments have already shown that the homeodomain TF Bicoid is required for connectivity but not molecular identity or morphology. In Aim 2, I will utilize how the MDN-Pair1 circuit is remodeled during Drosophila metamorphosis and persists in the adult fly. I will assay whether the TFs required for establishing MDN-Pair1 connectivity are also required for maintaining the MDN-Pair1 circuit throughout adulthood. My pilot data shows that Bicoid is also expressed in the adult Pair1 neurons. My overarching goal is to advance the understanding of how developmental mechanisms, specifically homeodomain TFs, establish circuits during development and maintain circuits after periods of plasticity/remodeling. Given that fly and mammalian neurogenesis share many conserved features, that homeodomain TFs are highly conserved between species, and that aberrant neural circuits have been implicated in neurodevelopmental and psychiatric disorders, we expect our results to be both translatable and therapeutically relevant.

项目总结/摘要 神经元的身份是在发育过程中产生的，其特征在于神经元特异性。 基因表达、轴突/树突形态和连通性。同源结构域转录因子 (TFs)是建立基因表达和神经元形态所必需的，但它们是否 神经元连接所需的是未知的。了解发展过程 一般来说，产生神经元的同一性，特别是连接性，对于理解 大脑的组装和功能一个有吸引力的模型是同源结构域TF-已知调节 神经元的分子和形态特征-也促进细胞表面的表达 这些分子可以形成高度特异性的神经连接。之间的连接 单个神经元对神经回路有贡献，神经回路允许感觉、运动和认知。 在整个生命过程中，正确的回路功能依赖于持续的回路重塑，无论是突触还是神经元。 结构上。有趣的是，同源结构域TF在成年神经元中表达，在神经元表达之后很久， 身份已经确立。我假设同源域TF是神经系统 电路的建立和维护贯穿整个生命周期。为了验证这一点，我执行了一个 系统筛选运动神经回路功能所需的同源域TF， 果蝇，月球漫步下降神经元（MDN）和Pair 1回路。我已经确认了16个 MDN或Pair 1光遗传学诱导的运动所需的同源域TF。在目标1中，我将测试 这16个同源结构域TF如何通过测定分子身份来促进神经元身份， 轴突/树突形态和连通性。我的初步实验已经表明， 同源结构域TF Bicoid是连接所必需的，而不是分子身份或形态。在Aim中 2，我将利用MDN-Pair 1电路在果蝇变态过程中如何重塑并持续存在 在成年苍蝇中。我将分析建立MDN-Pair 1连接所需的TF是否也 在整个成年期维持MDN-Pair 1回路所需的。我的飞行员数据显示Bicoid 在成年Pair 1神经元中也有表达。我的首要目标是促进对 发育机制，特别是同源结构域TF，如何在 在可塑性/重塑期后发展和维持回路。考虑到那只苍蝇 哺乳动物的神经发生具有许多保守的特征，同源结构域TF高度保守， 在物种之间是保守的，异常的神经回路与 神经发育和精神疾病，我们希望我们的结果既可翻译， 治疗相关。