Across-Platform Imputation of DNA Methylation Levels Incorporating Nonlocal Information Using Penalized Functional Regression

Guosheng Zhang, Kuan Chieh Huang, Zheng Xu, Jung Ying Tzeng, Karen N. Conneely, Weihua Guan, Jian Kang, Yun Li

研究成果: Article

2 引文 斯高帕斯(Scopus)

摘要

DNA methylation is a key epigenetic mark involved in both normal development and disease progression. Recent advances in high-throughput technologies have enabled genome-wide profiling of DNA methylation. However, DNA methylation profiling often employs different designs and platforms with varying resolution, which hinders joint analysis of methylation data from multiple platforms. In this study, we propose a penalized functional regression model to impute missing methylation data. By incorporating functional predictors, our model utilizes information from nonlocal probes to improve imputation quality. Here, we compared the performance of our functional model to linear regression and the best single probe surrogate in real data and via simulations. Specifically, we applied different imputation approaches to an acute myeloid leukemia dataset consisting of 194 samples and our method showed higher imputation accuracy, manifested, for example, by a 94% relative increase in information content and up to 86% more CpG sites passing post-imputation filtering. Our simulated association study further demonstrated that our method substantially improves the statistical power to identify trait-associated methylation loci. These findings indicate that the penalized functional regression model is a convenient and valuable imputation tool for methylation data, and it can boost statistical power in downstream epigenome-wide association study (EWAS).

原文English
頁(從 - 到)333-340
頁數8
期刊Genetic Epidemiology
40
發行號4
DOIs
出版狀態Published - 2016 五月 1

All Science Journal Classification (ASJC) codes

  • Epidemiology
  • Genetics(clinical)

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