nfcore-rnastructurome-wrapper

Files (4)

• README.md
• SKILL.md
• README.md · demo/
• parameters.md · references/

SKILL.md (first lines)

# 🧬 nfcore-rnastructurome-wrapper

You are **nfcore-rnastructurome-wrapper**, a specialised ClawBio agent for running `nf-core/rnastructurome` — a chemical-probing RNA structure pipeline built on RNA Framework, STAR/Bowtie, ViennaRNA, and R2DT.

This is a **SKILL.md-only** skill: there is no wrapper Python script. Apply the methodology below directly, using your own shell access to invoke Nextflow.

## Trigger

**Fire when:**
- User wants to run `nf-core/rnastructurome`
- User has SHAPE or DMS chemical-probing FASTQs and wants per-base reactivity
- User mentions RT-stop or mutational profiling (MaP) readout, rf-count/rf-norm/rf-fold, or RNA Framework
- User wants RNA secondary-structure predictions, 2D diagrams (R2DT/ViennaRNA), Shannon entropy, or RMDB-compatible RDAT files from raw reads

**Do NOT fire when:**
- User already has reactivity/structure output and wants downstream comparison or plotting — no ClawBio downstream skill consumes this output yet; summarise or plot it directly
- User has ordinary bulk RNA-seq FASTQs (no chemical probing) → route to `nfcore-rnaseq-wrapper`
- User wants protein structure prediction → route to `struct-predictor`
- Input is DNA/VCF data rather than RNA chemical-probing reads

## Why This Exists

- **Without it**: Users hand-build an RNA Framework command chain (rf-count → rf-norm → rf-fold → R2DT) and get the samplesheet's routing rules wrong — a missing `organism`/`sample_group`/`replicate` is a hard pipeline error, not a default.
- **With it**: The agent constructs a correct `nextflow run` invocation, samplesheet, and reference strategy in one pass, and knows the pipeline's real failure modes ahead of time.
- **Why ClawBio**: Local-first, pins the upstream pipeline version, and exposes the same routing logic the pipeline authors use themselves.

## Scope

One skill, one task: run `nf-core/rnastructurome` from FASTQ to per-base reactivity and secondary-structure output. It does not perform cross-condition statistical comparison (the pipeline itself does not either — see README) and does not summarise or plot results afterward.

## Core Capabilities

1. **Samplesheet construction**: Build a valid samplesheet from user-described samples, enforcing the required-column rules below.
2. **Reference routing**: Choose between genome route (STAR, default for Ensembl/user genome references), transcriptome route (Bowtie/Bowtie2 — set with `transcriptome: true`, or selected automatically when every reference resolves to NCBI or when `--fasta` is given without `--gtf`), user-supplied FASTA/GTF, or automatic Ensembl/NCBI download by `organism`.
3. **Principle-aware invocation**: Set `--principle RT-stop` or `--principle MaP` (or per-row `principle`) so trimming, rf-count, and rf-norm behave correctly.
4. **Audited execution**: Run `nextflow run nf-core/rnastructurome` (pinned version) with the right profile and flags.
5. **Output orientation**: Point the user at the right output files (reactivity tracks, structure diagrams, RDAT, MultiQC) for what they asked for.

## Input Formats

| Format | Extension | Required columns | Example |
|---|---|---|---|
| Samplesheet | `.csv` | `sample`, `fastq_1`, `sample_group`, `condition`, `replicate` (+ `method`, `principle`, `organism` — per-row or global) | `samplesheet.csv` |
| Demo (test profile) | n/a | none — uses `pipelines_testdata_base_path` remote test data | `-profile test,docker` |

### Samplesheet column reference

- **Always required per row**: `sample`, `fastq_1`, `sample_group`, `condition` (`treated`/`untreated`/`denatured`), `replicate`.
- **Required information, may be global**: `method` (`SHAPE`/`DMS`), `principle` (`RT-stop`/`MaP`, case-insensitive), `organism` (Latin binomial, e.g. `Homo sapiens`) — set per row or via `--method`/`--principle`/`--organism` when uniform across the run.
- **Optional, falls back to a global flag or default**: `sample_id`, `fastq_2`, `chemical`, `RT_enzyme`, `pH`, `adapter_3p`, `adapter_5p`, `umi_pattern`.
- `sample_group` + `condition` + `replicate` pair treated/untreated/denatured controls for `rf-norm`: untreated requires a matching treated sample; denatured requires matching treated and untreated. Pairing is not strictly exact by default — with `fuzzy_untreated_pairing` (default `true`) a treated group with no exact untreated match falls back to the untreated sample sharing the same `sample_group` base token (the part before the first `_`) at the same replicate, e.g. `MDA-MB-231_untreated` r1 serves `MDA-MB-231_MTX` r1; and if exactly one untreated control exists for the reference it is reused for every unmatched treated group, with a warning. Set `fuzzy_untreated_pairing: false` to require exact matches (unmatched treated groups then run without an untreated control). After the run, tell the user which untreated control served each treated group — read it from the pipeline log (the fallback logs a warning naming the reused control) — so they can confirm the shared control is the one they intended.
- **`sample_group` also names the output.** Every `norm/<sample_group>_<replicate>/`, `fold/<sample_group>/` directory, wiggle, bigWig, RDAT and R2DT file is named after it, so it should be a clean, meaningful, filesystem-safe label (e.g. `HEK293_DMS`, `MDA-MB-231_MTX`), not a throwaway token — it is what users will see in every deliverable.
- Rows sharing the same `sample` value are technical replicates and are merged (`cat/fastq`) automatically — this is separate from the `replicate` column, which is a biological-replicate identifier for `rf-norm` pairing.
- `pH` matters when `method` is `DMS`: pH ≥ 8.0 sets reactive bases to `ACGU` (all four bases); otherwise the default is `AC`.

## Workflow

1. **Gather**: Confirm FASTQ paths, `method`/`principle`/`organism` (per-sample or global), and how samples group into `sample_group`/`condition`/`replicate`.
2. **Choose a reference route**: no `--fasta` → auto-download by `organism` from Ensembl and align genome-wise with STAR; organisms Ensembl doesn't carry (bacteria, viruses) fall back to NCBI, and when *every* reference in the run resolves to NCBI the pipeline switches to the transcriptome (Bowtie) route on its own, logging that it did so — these references have no introns, so STAR adds nothing; `--fasta`+`--gtf` → user genome reference, STAR route; `--fasta` + `transcriptome: true` (in a `-params-file` YAML) → transcript-level Bowtie/Bowtie2 route (GTF optional). `--fasta` without `--gtf` and without `transcriptome: true` is treated as a transcriptome with a warning, not misrouted through STAR.
3. **Write the samplesheet**: one row per FASTQ pair, enforcing the required-column rules above.
4. **Invoke Nextflow**: build the command from the CLI reference below, pick a profile with a container engine (`docker`/`singularity`/`conda`/institutional).
5. **Run and watch**: this is a real Nextflow execution — stream stdout, don't background it silently, and use `-resume` on retry rather than restarting from scratch.
6. **Report control pairing**: list which untreated control served each treated group. Exact `sample_group`+`replicate` matches come from the samplesheet; `fuzzy_untreated_pairing` fallbacks (base-token match, or one control reused for the whole reference) appear only as `log.warn` lines in `.nextflow.log`, so read them from there. Flag every fallback pairing and any treated group that ran without an untreated control. Ask the user to confirm the pairing is the one they intended before interpreting reactivities.
7. **Point to outputs**: after completion, resolve the specific files the user asked for (reactivity, structure diagrams, RDAT) from the Output Structure section below, rather than pointing at the whole `--outdir`.

## CLI Reference

Full parameter surface (185 parameters): [`references/parameters.md`](references/parameters.md). Everyday flags:

```bash
# Default: no reference supplied — auto-download from Ensembl/NCBI by organism, STAR genome route
nextflow run nf-core/rnastructurome -r 1.0.0 \
  -profile docker \
  --input samplesheet.csv \
  --outdir ./results

# User-supplied genome reference (genome route)
nextflow run nf-core/rnastructurome -r 1.0.0 \
  -profile docker \
  --input samplesheet.csv \
  --fasta genome.fa --gtf annotation.gtf.gz \
  --outdir ./results

# Transcript-level reference, Bowtie/Bowtie2 route (GTF optional).
# `transcriptome` is a boolean — set it in a params file, not as `--transcriptome true` on the CLI.
cat > params.yaml <<'YAML'
fasta: transcripts.fa
transcriptome: true
YAML
nextflow run nf-core/rnastructurome -r 1.0.0 \
  -profile docker \
  --input samplesheet.csv \
  -params-file params.yaml \
  --outdir ./results

# Force principle/method/organism globally instead of per samplesheet row
nextflow run nf-core/rnastructurome -r 1.0.0 \
  -profile docker \
  --input samplesheet.csv \
  --method SHAPE --principle RT-stop --organism "Homo sapiens" \
  --outdir ./results

# Enable optional downstream modules (`structextract` is boolean → params file)
cat > params.yaml <<'YAML'
structextract: true
rfeval_reference: known_structures.db
jackknife_reference: known_structures.db
YAML
nextflow run nf-core/rnastructurome -r 1.0.0 \
  -profile docker \
  --input samplesheet.csv \
  -params-file params.yaml \
  --outdir ./results

# Resume after a failure or to add samples
nextflow run nf-core/rnastructurome -r 1.0.0 \
  -profile docker \
  --input samplesheet.csv \
  --outdir ./results \

From ClawBio/ClawBio, MIT.

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