Interpretable Machine Learning to Identify Alzheimer's Disease Therapeutic Targets

可解释的机器学习识别阿尔茨海默病的治疗目标

• 批准号: 10132962
• 负责人: Su-In Lee
• 金额: $ 58.2万
• 依托单位: UNIVERSITY OF WASHINGTON
• 依托单位国家: 美国
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-02-15 至 2023-12-21
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10132962
• 关键词: Address; Affect; Algorithms; Alzheimer' s Disease; Alzheimer' s disease diagnosis; Alzheimer' s disease model; Alzheimer' s disease therapeutic; Amyloid beta-Protein; Animal Model; Award; Big Data; Biological; Biological Markers; Brain; Caenorhabditis elegans; Cause of Death; Cell physiology; Classification; Collaborations; Complex; Computer Models; Country; Data; Data Science; Data Set; Disease; Disease Progression; Drug Targeting; Educational workshop; Frequencies; Gene Expression; Genes; Genetic study; Heterogeneity; Human; Image; Individual; International; Intervention; Knowledge; Label; Lasso; Learning; Linear Models; Machine Learning; Measures; Methods; Modeling; Molecular; Molecular Chaperones; Multiomic Data; Nature; Nematoda; Network-based; Neurofibrillary Tangles; Oral; Orthologous Gene; Outcome; Paper; Pathogenesis; Pathologic; Pathology; Pathway interactions; Peptides; Phenotype; Play; Prevention; RNA Interference; Research Priority; Role; Selection Criteria; Senile Plaques; Signal Transduction; Statistical Models; Supervision; Techniques; Testing; Toxic effect; Training; Transgenic Organisms; Trees; United States; Validation; Variant; base; biomarker discovery; brain tissue; candidate marker; clinical practice; deep learning; direct application; disease heterogeneity; drug response prediction; effective therapy; experimental study; feature selection; gene function; gene interaction; high dimensionality; human data; improved; in vivo; interest; knock-down; machine learning algorithm; machine learning method; molecular marker; novel; outcome prediction; phenotypic biomarker; precision medicine; predictive modeling; protective factors; proteostasis; rapid growth; response; success; tau Proteins; therapeutic target; therapy development

Project Summary Alzheimer’s disease (AD) is an urgent national and international research priority. Amyloid plaques and neurofibrillary tangles are the hallmark of AD. Their building blocks are Amyloid-β (Aβ) and tau, respectively. At present, we lack an understanding of the set of genes that affect formation of plaques and tangles along with protective and pathological responses to these toxic peptides. Biologists are now gathering gene expression data and Aβ and tau measures from human brain tissues. The current approach attempts to find a set of features (here, gene expression levels) that best predict an outcome (Aβ or tau level). The identified features, biomarkers, can help determine the molecular basis for plaques and tangles. Unfortunately, false positive biomarkers are very common, as evidenced by low success rates of replication in independent data and low success reaching clinical practice (less than 1%). We seek to radically shift the current paradigm in biomarker discovery by resolving three fundamental problems with the current approach using novel, theoretically well-founded machine learning (ML) methods to learn interpretable models from data. Aim 1. Learn an interpretable feature representation from publicly available, high-throughput brain data. High-dimensionality, hidden variables, and complex feature correlations create a discrepancy between predictability (i.e., observed statistical associations) and true biological interactions. To increase the chance to identify true positive biomarkers, we need new feature selection criteria to learn a model that better explains rather than simply predicts the outcome. To do so, our proposed ML algorithms will identify the genes that are likely to give a meaningful explanation of the outcome (Aβ or tau level) by inferring both the functions of genes in the cellular processes contributing to AD and the gene interaction network from many existing brain datasets. Aim 2. Make interpretable predictions using a unified framework to explain model predictions. Due to disease heterogeneity, complex models (e.g., deep learning or ensemble models) often more accurately describe relationships between genes and an outcome than simpler, linear models, but lack interpretability. We will develop a novel ML framework that interprets complex model predictions by estimating the importance of each feature to a specific prediction, which will identify features of high importance for each individual as personalized markers and classify subjects based on these importance estimates. Aim 3. Validate the identified candidate biomarkers using powerful worm models of AD. Analyzing observational data without doing interventional experiments cannot prove causal relationships. In collaboration with co-I Matt Kaeberlein, we will utilize powerful nematode models of AD to test our hypotheses on the role of certain genes as disease modifiers, and develop a new way to refine the models based on this knowledge. Successful completion of this project will result in previously unknown molecular basis for Aβ and tau levels, potential therapeutic targets, and general ML techniques widely applicable to many other data science problems.

项目总结