Demystifying Disorders of Bicistronic Calcium Channel Genes

揭秘双顺反子钙通道基因的疾病

• 批准号: 10625488
• 负责人: Christopher Manuel Gomez
• 金额: $ 109.06万
• 依托单位: UNIVERSITY OF CHICAGO
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-01 至 2028-04-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10625488
• 关键词: Affect; Antisense Oligonucleotides; Binding; Biological; Calcium Channel; Calcium Signaling; Cell Nucleus; Cell physiology; Complex; Disease; Epitopes; Genes; Genotype; Human; Impairment; Individual; Internal Ribosome Entry Site; Luciferases; MicroRNAs; Microscopy; Mutation; Neurologic Symptoms; Neurons; Nuclear Translocation; Outcome; Patients; Phenotype; Physiological; Process; Proteins; Recombinants; Regulation; Reporter; Research; Source; Stimulus; Transgenic Mice; Translating; Translations; Viral Vector; Western Blotting; insight; neuron development; neuropsychiatric symptom; next generation; novel; protein function; therapy development; transcription factor

Abstract The long term objectives of this project are to explain the basis for the complex genotype-phenotype relationships for a growing number of severe calcium channel gene disorders and develop therapies based on these new insights. To make these advances we will capitalize on our new discovery that at least three of these calcium channel genes are bicistronic i.e. they encode two distinct proteins, the calcium channel proteins and a newly discovered transcription factor. We have discovered that the transcription factor is translated by internal translation by a process resembling an internal ribosomal entry site (IRES). We hypothesize that mutations in these Ca2+ channel genes may have a diversity of outcomes, affecting, in distinct cases, neuronal firing, calcium signaling, regulation of the expression of the transcription factor or directly altering the function of the transcription factor. In this study we will systematically explore the function and biological action of these three novel transcription factors, how their expression is regulated by the IRES, how normal cellular physiology governs their translocation to and from the nucleus, and how different mutations affecting channel gating, IRES function and transcription factor cause impaired neuronal development and or viability in these different disorders. We will study this using recombinant calcium channels expressed in primary neurons and human reprogrammed neurons from normal and patient sources, and in transgenic mice expressing well characterized mutations. We will study gene binding and expression using next generation approaches, nuclear translocation using epitope and fluorescent tags with physiological stimuli, IRES function using dual luciferase reporters and immunoblotting, neuronal development using immunofluorescent microscopy and corrective therapy using antisense oligos, miRNA and AAV viral vectors expressing transcription factors.

摘要