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A novel statistical method for modeling covariate effects in bisulfite sequencing derived measures of DNA methylation

Author

Listed:
  • Kaiqiong Zhao
  • Karim Oualkacha
  • Lajmi Lakhal‐Chaieb
  • Aurélie Labbe
  • Kathleen Klein
  • Antonio Ciampi
  • Marie Hudson
  • Inés Colmegna
  • Tomi Pastinen
  • Tieyuan Zhang
  • Denise Daley
  • Celia M.T. Greenwood

Abstract

Identifying disease‐associated changes in DNA methylation can help us gain a better understanding of disease etiology. Bisulfite sequencing allows the generation of high‐throughput methylation profiles at single‐base resolution of DNA. However, optimally modeling and analyzing these sparse and discrete sequencing data is still very challenging due to variable read depth, missing data patterns, long‐range correlations, data errors, and confounding from cell type mixtures. We propose a regression‐based hierarchical model that allows covariate effects to vary smoothly along genomic positions and we have built a specialized EM algorithm, which explicitly allows for experimental errors and cell type mixtures, to make inference about smooth covariate effects in the model. Simulations show that the proposed method provides accurate estimates of covariate effects and captures the major underlying methylation patterns with excellent power. We also apply our method to analyze data from rheumatoid arthritis patients and controls. The method has been implemented in R package SOMNiBUS.

Suggested Citation

  • Kaiqiong Zhao & Karim Oualkacha & Lajmi Lakhal‐Chaieb & Aurélie Labbe & Kathleen Klein & Antonio Ciampi & Marie Hudson & Inés Colmegna & Tomi Pastinen & Tieyuan Zhang & Denise Daley & Celia M.T. Green, 2021. "A novel statistical method for modeling covariate effects in bisulfite sequencing derived measures of DNA methylation," Biometrics, The International Biometric Society, vol. 77(2), pages 424-438, June.
    • Handle: RePEc:bla:biomet:v:77:y:2021:i:2:p:424-438
    DOI: 10.1111/biom.13307
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    References listed on IDEAS

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