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imRIP

Integrated methods for meRIP-seq data analysis

Multiple conda environments involved to use all these tools together.

1. Pre-processing

  • Starting from raw Fastq files
  • Trimming task using cutadapt
  • Alignment task using STAR
  • Check raw data quality using MultiQC

2. Peak-calling [+ Differential methylation analysis]

  • Using RADAR package
    • It only works for peak-calling and differential methylation analysis at once (samples at two conditions)
    • (it has multiprocessing option then it works faster)
  • Gene level methylation enrichment and pathway analysis using iPAGE If study design has no differential analysis:
  • Using exomePeak package
    • It also works with samples which are only at one condition

3. Validating meRIP experiment success

  • Draw metagene plots using Guitar package
  • Motif analysis to check DRACH & RGAC motif presentation using FIRE algorithm

4. Test global hyper/hypo methylation shift

  • Draw histogram using ggplot2 package (easy!)
  • Using wilcox-test and t-test to confirm global hyper or hypo methylation among significant peaks

5. Enrichment analysis of condition-induced methylated sites in other datasets

  • Select hyper/hypo gene sets (genes with logFC above/under a threshold) using awk command (easy!)
  • Evaluate enrichment within other high-throughput datasets using a module from TIESER algorithm
    • It works through Mutual Information (MI) evaluation same as FIRE and iPAGE

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Contributors

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