Transcriptomic and Pharmacogenetic Asthma Endotypes in Minority Children

少数民族儿童哮喘内型的转录组学和药物遗传学

基本信息

批准号：
9219450
负责人：
Esteban Gonzalez Burchard
金额：
$ 80.54万
依托单位：
NATIONAL JEWISH HEALTH
依托单位国家：
美国
项目类别：
财政年份：
2017
资助国家：
美国
起止时间：
2017-05-01 至 2022-04-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/9219450
关键词：
Adrenal Cortex Hormones Affect African American Albuterol Asthma Biological Markers Blood Breathing Bronchoscopy Cell Culture Techniques Cells Child Childhood Asthma Chromosome Mapping Clinical Collaborations Communities Complex Computer Analysis DNA Data Death Rate Disease Environment Epithelial Epithelial Cells Exhibits Functional disorder Gene Expression Gene Expression Profiling Genetic Genetic Determinism Genetic Markers Genetic Screening Genetic Transcription Genomics Goals Health Policy Heterogeneity Human In Vitro Infection Interleukin-13 Laboratories Latino Lead Measures Medical Methods Modeling Molecular Molecular Profiling Morbidity - disease rate Nose Pathogenesis Pathology Patients Pharmaceutical Preparations Pharmacogenetics Population Public Health Publications Puerto Rican RNA Recurrence Research Resources Respiratory Signs and Symptoms Respiratory physiology Rhinovirus Risk Sampling Severities Subgroup Testing Therapeutic airway epithelium airway inflammation airway obstruction analytical method asthmatic clinical practice cytokine design differential expression disease phenotype ethnic difference ethnic diversity experience genome sequencing genome wide association study high risk minimally invasive minority children mortality novel peripheral blood personalized medicine racial and ethnic response success synergism targeted treatment trait transcriptome transcriptome sequencing transcriptomics whole genome

项目摘要

PROJECT SUMMARY Asthma affects 5% of the world population. In the U.S., asthma death rates are four-fold higher in Latinos and African Americans compared to Whites. Childhood asthma is a complex disease historically defined by partially overlapping clinical features. However, the heterogeneity observed in clinical disease and airway pathology suggests that the standard definition of asthma is composed of multiple clinical subgroups each with a distinct pathogenesis (i.e. endotypes). Gene expression profiling of bronchial airway brushings identified the type 2- high asthma endotype, defined by excessive airway inflammation driven by type 2 cytokines. We found that the type 2-high asthma endotype can be identified by gene expression profiling of minimally invasive nasal airway epithelium brushings. We also found high nasal expression of the type 2 cytokine, IL-13, was associated with higher risk of asthma attacks among Puerto Ricans, who have the highest asthma morbidity and mortality in the U.S. The populations with the highest asthma morbidity also have the poorest response to the most common asthma medication, albuterol. We hypothesize that specific molecular airway endotypes will define children with severe asthma and poor drug response and that these endotypes will have a strong genetic basis. To investigate this hypothesis the following aims are proposed: (1) Determine the expression endotypes of childhood asthma that underlie poor albuterol drug response and severe disease, using minimally invasive samples. Molecular endotyping with be performed by computational analysis of whole transcriptome sequencing data generated from 745 asthmatic and healthy children. Correlates of airway endotypes will be identified using peripheral blood gene expression. (2) Determine how IL-13 modifies airway cell responses to albuterol and HRV infection, and the genetic control of these responses. A powerful in vitro airway epithelial model will be used to determine if type 2 inflammation of the airway epithelium modifies transcriptional response to albuterol (most common asthma medication) and human rhinovirus (HRV) infection (most common trigger of asthma attacks). (3) Determine the genetic basis of and validate poor drug response and severe asthma endotypes in ethnically diverse children. We will perform the first genetic screen of type 2-high and other asthma endotypes. We will examine data from 4,379 minority children with asthma to determine how asthma endotypes influence response to albuterol and risk for severe asthma. Our goal is to understand the genetic basis of racial/ethnic differences in asthma severity and lung function. Results from this proposal will inform public health policy and clinical practice and aide in the mechanistic understanding of asthma severity (morbidity), which may lead to more targeted therapies. Data generated from our proposal will become a valuable resource for the medical and scientific communities.

项目概要哮喘影响着世界 5% 的人口。在美国，拉丁裔和拉丁裔的哮喘死亡率高出四倍非裔美国人与白人相比。儿童哮喘是一种复杂的疾病，历史上部分定义为重叠的临床特征。然而，在临床疾病和气道病理学中观察到的异质性表明哮喘的标准定义由多个临床亚组组成，每个亚组都有不同的特征发病机制（即内型）。支气管气道刷检的基因表达谱鉴定出 2 型高哮喘内型，定义为由 2 型细胞因子驱动的过度气道炎症。我们发现通过微创鼻气道的基因表达谱可以识别2型高哮喘内型上皮刷。我们还发现 2 型细胞因子 IL-13 的高鼻表达与波多黎各人哮喘发作的风险较高，他们的哮喘发病率和死亡率最高在美国，哮喘发病率最高的人群对最严重的哮喘病的反应也最差。常见的哮喘药物，沙丁胺醇。我们假设特定的分子气道内型将定义患有严重哮喘和药物反应不佳的儿童，并且这些内型将具有很强的遗传性基础。为了研究这一假设，提出以下目标：（1）确定表达内型使用微创治疗导致沙丁胺醇药物反应不佳和严重疾病的儿童哮喘样品。通过整个转录组的计算分析进行分子内型分析测序数据来自 745 名哮喘儿童和健康儿童。气道内型的相关性是使用外周血基因表达进行鉴定。 (2) 确定 IL-13 如何改变气道细胞的反应沙丁胺醇和 HRV 感染，以及这些反应的遗传控制。强大的体外气道上皮细胞模型将用于确定气道上皮的 2 型炎症是否会改变转录对沙丁胺醇（最常见的哮喘药物）和人鼻病毒（HRV）感染（最常见的药物）的反应哮喘发作的诱因）。 (3) 确定药物反应不良和严重的遗传基础并验证不同种族儿童的哮喘内型。我们将进行第一次 2 型高和其他哮喘内型。我们将检查 4,379 名患有哮喘的少数民族儿童的数据，以确定如何哮喘内型影响对沙丁胺醇的反应和严重哮喘的风险。我们的目标是了解哮喘严重程度和肺功能的种族/民族差异的遗传基础。该提案的结果将为公共卫生政策和临床实践提供信息，并帮助从机制上理解哮喘严重程度（发病率），这可能会导致更有针对性的治疗。我们的提案生成的数据将成为医学界和科学界的宝贵资源。