omics.co.in logo omics.co.in

13: Reproducible Research with Quarto & R Markdown

1 min read • Verified October 2026 • Peer-Reviewed Learning Resource
Tested Stacks: GATK 4.6.1 Samtools 1.21 Nextflow 24.10 Seurat v5.1 Python 3.12
Prerequisites: Basic Linux CLI & Sequencing Formats
📚 Chapter 13 of 13 0% Course Completed
📊 Downloadable Lesson R Script 3.7 KB

r13_reproducible_quarto_notebook.R

Automated generation of parameterized Quarto computational notebooks (.qmd), literate programming best practices, and pipeline environment locking via sessionInfo().

$ Rscript r13_reproducible_quarto_notebook.R

Chapter 13: Capstone: Reproducible Research with Quarto & R Markdown

Reproducibility is the foundational currency of modern scientific inquiry. Parameterized computational notebooks authored with Quarto (.qmd) and R Markdown (.Rmd) seamlessly interweave biological narrative, statistical code, and publication figures into self-contained HTML/PDF reports.

1. Anatomy of a Quarto Genomic Notebook

---
title: "Precision Oncology Multi-Omics Report"
author: "Omics Portal Core"
format:
  html:
    toc: true
    code-fold: show
    self-contained: true
params:
  cohort: "NSCLC_Tumors"
  fdr_cutoff: 0.01
---

2. Environment Provenance & Package Locking

Recording precise software versions guarantees analysis reproducibility decades later:

# Capture exact session dependencies
sessionInfo()

# Initialize renv for project lockfile
# renv::init()
# renv::snapshot()
The 5-Step Computational Biology Reproducibility Audit
  1. Immutable Raw Data: Never overwrite raw sequencing reads or primary count matrices.
  2. Set Random Seeds: Explicitly call set.seed() prior to UMAP, t-SNE, or clustering runs.
  3. Locked Dependencies: Commit renv.lock with specific Bioconductor build versions.
  4. Parameterization: Decouple data file paths from analytical algorithms.
  5. Open Code & Data: Deposit scripts to GitHub and raw data to NCBI GEO / SRA.
⚠️

Common Pitfalls & Troubleshooting Checklist

  • Java Heap Exhaustion (GATK / Picard): If processes terminate with java.lang.OutOfMemoryError, set your environment variable explicitly: export _JAVA_OPTIONS="-Xmx16g -Djava.io.tmpdir=/tmp".
  • Index Timestamp Mismatch: If tools complain that a BAM index is missing or out of date, regenerate with samtools index -@ 4 sample.bam.
  • Conda Channel Conflicts: Avoid ABI incompatibilities between bioconda and conda-forge by setting strict priority: conda config --set channel_priority strict.
  • Chromosome Naming Contamination: Always verify whether reference FASTA headers use chr1 or 1; divergent naming causes silent alignment drops.
Was this guide helpful to your research?
Help us maintain 100% accurate, peer-reviewed bioinformatics standards.
📝 Propose Edit on GitHub ↗