Identifying Signaling Mechanisms Controlling Flagellar Length in Chlamydomonas

识别衣藻中控制鞭毛长度的信号机制

• 批准号: 7997846
• 负责人: PRACHEE AVASTHI
• 金额: $ 4.76万
• 依托单位: UNIVERSITY OF CALIFORNIA, SAN FRANCISCO
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7997846
• 关键词: Bardet-Biedl Syndrome; Cell physiology; Cells; Chlamydomonas; Chlamydomonas reinhardtii; Cilia; Cilium Microtubule; Complex; Cytoplasm; Disease; Environment; Flagella; G Protein-Coupled Receptor Genes; Green Algae; Green Fluorescent Proteins; Hydrocephalus; Insertional Mutagenesis; Length; Lipase; Maintenance; Mammalian Cell; Nephronophthisis; Organelles; Pathologic; Pathology; Pathway interactions; Polycystic Kidney Diseases; Proteins; Public Health; RNA Interference; Regulation; Retinal Degeneration; Role; Sensory; Signal Transduction; Signaling Molecule; Signaling Protein; Source; Structure; Surface; Testing; Therapeutic Intervention; base; extracellular; insight; mutant; novel; public health relevance; seven-transmembrane G-protein-coupled receptor

DESCRIPTION (provided by applicant): Cilia are microtubule-based organelles that protrude from the surface of most mammalian cells for functions ranging from regulating body symmetry to sensory functions. Abnormalities in formation and maintenance of cilia often have variable pathologic consequences due to the near-ubiquity of these organelles. The structure and assembly of cilia are highly conserved and are readily studied in the motile flagella of the unicellular green alga Chlamydomonas reinhardtii. The length of flagella on these cells is highly responsive to the extracellular and intracellular environment. Understanding the signaling mechanisms involved in sensing abnormalities and responding with changes in length, as well as understanding the mechanisms involved in intrinsic length determination are critically important for identifying sources of cilia related pathology. To tackle this central question, I will first identify the function of uncharacterized signaling molecules that are unregulated during flagellar assembly including a GPCR and a lipase domain containing protein, FAP12. I will also investigate the complex interactions of known length-regulating proteins LF1p, LF2p, LF3p and LF4p to determine how they act with one another for tight control of flagellar length. Finally I will identify novel components in this pathway using an insertional mutagenesis screen for suppressors of a long flagella mutant. PUBLIC HEALTH RELEVANCE: Identifying and characterizing signaling molecules that can control the length of the nearly ubiquitous ciliary organelle will give us significant insights into the ciliopathies that result from abnormal cilium size. Specifically, testing the specific role of cilia length regulation complexes and identifying novel components in pathways regulating length will provide many new potential targets for therapeutic intervention in a wide range of ciliopathies. These ciliopathies include polycystic kidney disease, nephronophthisis, Bardet-Biedl syndrome, hydrocephalus, retinal degeneration and many others.

描述（由申请人提供）：纤毛是基于微管的细胞器，它们从大多数哺乳动物细胞的表面伸出，用于从调节身体对称性到感觉函数的功能。纤毛的形成和维持的异常，由于这些细胞器的近乎偶然性，通常会产生可变的病理后果。纤毛的结构和组装是高度保守的，并且很容易在单细胞绿色藻类衣原体的林格氏鞭毛中进行研究。这些细胞上的鞭毛长度对细胞外和细胞内环境有很高的反应。了解传感异常和响应长度变化以及理解内在长度确定所涉及的机制对于识别纤毛相关病理的来源至关重要。为了解决这个中心问题，我将首先确定在鞭毛组装过程中不受监管的未表征信号分子的功能，包括GPCR和含有蛋白质蛋白质FAP12的脂肪酶结构域。我还将研究已知的长度调节蛋白LF1P，LF2P，LF3P和LF4P的复杂相互作用，以确定它们如何相互作用以紧密控制鞭毛长度。最后，我将使用插入诱变筛选为长鞭毛突变体的抑制剂来鉴定该途径中的新成分。 公共卫生相关性：识别和表征可以控制几乎无处不在的纤毛细胞器长度的信号分子，将使我们对异常纤毛大小产生的纤毛病态有很大的见解。具体而言，测试纤毛长度调节复合物的特定作用并在调节长度的途径中鉴定新成分将为多种纤毛病的治疗干预提供许多新的潜在目标。这些纤毛病包括多囊性肾脏疾病，肾植物，Bardet-Biedl综合征，脑积水，视网膜变性等。