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Gaining insights: the effects of the RMK gain-of-function mutations on brain development and neurodevelopmental disorders

获得见解：RMK 功能获得性突变对大脑发育和神经发育障碍的影响

基本信息

批准号：
10688073
负责人：
Tamar Green
金额：
$ 63.86万
依托单位：
STANFORD UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2022
资助国家：
美国
起止时间：
2022-08-21 至 2027-07-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10688073
关键词：
16 year old Acceleration Address Affect Animal Model Anisotropy Area Attention Attention deficit hyperactivity disorder Biological Models Biology Brain Brain imaging Brain region Caenorhabditis elegans Child Child Psychiatry Complex Copy Number Polymorphism Corpus striatum structure Correlation Studies Data Development Disease Genes Genetic Genetic Diseases Genomics Human In Vitro Individual Investigation Learning Disabilities Location Maps Measures Methods Mitogen-Activated Protein Kinases Modality Modeling Molecular Molecular Genetics Mutation Myelin Neurodevelopmental Disorder Noonan Syndrome Outcome PTPN11 gene Pathogenicity Pathway interactions Penetrance Phenotype Phosphorylation Predisposition Prognosis Proteins Psychological Tests RAF1 gene Rest Restriction Spectrum Imaging Risk Role Sampling Severities Signal Transduction Structure Surface Symptoms Syndrome System Testing Thick Time Translating Up-Regulation Variant Work autism spectrum disorder autosomal dominant mutation brain tissue clinical application comparison control computational neuroscience connectome connectome based predictive modeling density gain of function gain of function mutation genetic risk factor genetic testing genetic variant human model human morbidity imaging modality imaging study in silico in vivo innovation insight interest molecular dynamics neuroimaging non-invasive imaging rare genetic disorder src Homology Region 2 Domain white matter

项目摘要

Project Summary/Abstract Rare genetic disorders are a major cause of human morbidity, frequently affect brain development and cause neurodevelopmental disorders. Here, we propose using Noonan syndrome (NS, 1:2000) as a human model system to provide critical data on the effects of Ras/mitogen-activated protein kinase (RMK)-genetic alterations on the human brain's complex systems-level biology. Three lines of evidence support using NS as a human model system: 1) NS is caused by autosomal dominant mutations of high penetrance in specific genes compared to idiopathic neurodevelopmental disorders genetics of common variance, 2) NS has a larger impact on brain development and thus larger effect sizes than idiopathic neurodevelopmental disorders, 3) NS is associated with increased risk for neurodevelopmental disorders such as attention abilities, learning disabilities, and autism spectrum symptoms. Our lab has recently observed the effect of NS mutations in the PTPN11 gene on human brain structure, specifically the striatum, and brain function, specifically frontostriatal connectivity. However, there is limited data available on the effect of other NS mutations, RAF1 and SOS1, on the developing brain. To address this limitation, we propose determining whether three major NS disease genes RAF1, PTPN11, and SOS1 mutations, are associated with striatal alteration in a gradient of severity. To provide critical data on the relationships between PTPN11 genetic variance and brain development, we will test whether PTPN11 pathogenic variants are associated with altered brain development. Finally, we will test whether whole-brain connectivity can predict attention abilities in NS. This aim will provide a neuromarker for attention abilities (specifically inhibition) in NS. We will perform "deep phenotyping" - imaging studies of the striatum (volume, cellular density, seed-based functional connectivity) and the whole brain (surface area, cortical thickness, white matter, cortical myelin content, and whole-brain functional connectivity) and assess attention (inhibition) in children (7-16 years of age) with RAF1 (n=30), PTPN11 (n=45), and SOS1 (n=30) mutations, and compare them to typically developing controls (n=45). Two innovative aspects of the proposed work are using restriction spectrum imaging (RSI) to map the RMK pathway upregulation effect on the striatum cellular density. Second, we will assess the effect of RAF1 mutations on brain development for the first time. Defining the relationships between the brain and Noonan's genetics will accelerate the use of genetic testing to inform prognosis and treatments in NS. Further, describing these relationships will provide critical data on the role of the RMK in brain development.

项目总结/文摘