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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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A consistent pattern of slide effects in Illumina DNA methylation BeadChip array data.

Julian Hecker1, Sanghun Lee1,2,3, Priyadarshini Kachroo1

  • 1Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.

Epigenetics
|September 21, 2023
PubMed
Summary

Epigenetic studies using DNA methylation arrays face challenges from batch effects. This research identifies systematic patterns in slide effects on the Illumina MethylationEPIC array, improving data analysis for complex diseases.

Keywords:
DNA methylationEWASbatch effectsmethylation arraysslide effects

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Area of Science:

  • Genetics
  • Epigenetics
  • Bioinformatics

Background:

  • Thousands of DNA methylation CpG associations with complex diseases highlight epigenetics' role.
  • Methylation array analyses are vulnerable to batch/slide effects, impacting accuracy.
  • These effects can inflate false positive rates or reduce statistical power in association studies.

Purpose of the Study:

  • To characterize consistent patterns and joint distributions of slide effects across CpGs.
  • To extend previous findings on slide effects using the Illumina Infinium MethylationEPIC BeadChip array.
  • To provide insights for improving existing adjustment approaches for methylation data.

Main Methods:

  • Analysis of multiple DNA methylation datasets from the Illumina Infinium MethylationEPIC BeadChip array.
  • Identification and description of consistent patterns in slide effects.
  • Examination of the joint distribution of slide effects across CpGs.

Main Results:

  • Consistent patterns and joint distributions of slide effects were observed across CpGs.
  • The CpGs affected by slide effects overlap with content on the Illumina Infinium HumanMethylation450 BeadChip array.
  • Systematic patterns in slide effects were revealed, confirming and extending prior research.

Conclusions:

  • The study reveals systematic patterns in slide effects within DNA methylation data.
  • These findings offer deeper insights into the characteristics of slide effects.
  • The results can aid in refining and improving current methods for adjusting these effects in analyses.