bio-splicing-quantification

Methods for measuring alternative splicing from RNA-seq as PSI, or the percentage of a transcript’s RNA that includes a particular segment. They cover event-based, intron-cluster, local-splicing, and transcript-level measurements.

In plain words
What is it for?
Use it to measure exon inclusion, alternative splice-site use, intron retention, local splice variation, and transcript-level changes across samples or conditions.
Why use it?
It turns RNA-seq reads into comparable measurements of splice choices while making clear that different methods answer different biological questions. The choice also affects which data limitations matter.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/gptomics/bioskills/splicing-quantification
Any agent
npx skills add GPTomics/bioSkills --skill splicing-quantification
Clone the repo
git clone --depth 1 https://github.com/GPTomics/bioSkills

Made for: Claude Code, Codex.

Per session 187 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,168 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00187 $0.07168
Opus 5 $0.00093 $0.03584
Sonnet 5 $0.00037 $0.01434
Haiku 4.5 $0.00019 $0.00717

Measured 3d ago against content hash 5252e845e9e2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bio-splicing-quantification scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (examples/quantify_splicing.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

alternative-splicing/splicing-quantification/SKILL.md · 377 lines

How it starts

The opening of the file, as written. The whole thing — 377 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Version Compatibility

Reference examples tested with: rMATS-turbo 4.3+, SUPPA2 2.4+, leafcutter 0.2.9+, MAJIQ 3.0+, IRFinder-S 2.0+, kallisto 0.50+, Salmon 1.10+, pandas 2.2+, STAR 2.7.11+

Before using code patterns, verify installed versions match. If versions differ:

  • Python: pip show <package> then help(module.function) to check signatures
  • R: packageVersion('<pkg>') then ?function_name to verify parameters
  • CLI: <tool> --version then <tool> --help to confirm flags

If code throws ImportError, AttributeError, or TypeError, introspect the installed package and adapt the example to match the actual API rather than retrying.

Splicing Quantification

Quantify alternative splicing events as PSI (percent spliced in) from RNA-seq. PSI = inclusion read evidence / (inclusion + skipping read evidence), normalized for differential mapping opportunity between isoforms. The choice of quantification unit (event, intron cluster, LSV, transcript) determines which biological questions can be answered and which failure modes apply.

Algorithmic Taxonomy

Family Unit Reference tools Fails when
Event-based Pre-defined SE/A5SS/A3SS/MXE/RI events from annotation rMATS-turbo, SUPPA2, VAST-TOOLS Event isn't in annotation; complex multi-junction events split arbitrarily; AFE/ALE confounded with splicing
LSV-based Local Splice Variations at single source/target nodes MAJIQ V3 Memory-constrained environments; cohorts smaller than ~3 reps; non-academic users (license)
Junction-cluster Annotation-free intron clusters by shared splice sites leafcutter, leafcutter2 Undersampled clusters lose power; topology biologically uninterpretable for novel events
Splice-graph Graph nodes (non-overlapping exonic regions) Whippet, Shiba Whippet maintenance status uncertain since ~2022; complex multi-exon graphs
Coverage-aware (IR) Intron body coverage + flanking junctions IRFinder-S, S-IRFindeR, iREAD Confounded by overlapping exons, repeats, low mappability regions
Isoform-based Transcript abundance via EM Salmon/kallisto + tximport Salmon EM uncertainty propagates; many similar isoforms (TTN, MAPT) become indistinguishable

Read the full file on GitHub · 377 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 377 lines · 187 tokens per session scan A 5252e845e9e2

Subscribe to this mod's changes

bio-splicing-quantification is a skill published in the GitHub repository GPTomics/bioSkills (1,198 stars, last pushed 18d ago), licensed MIT. It adds 187 tokens to every session and 7,168 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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