differential-tf-occupancy-analysis

differential-tf-occupancy-analysis is a skill for Claude Code, Codex from HolobiomicsLab/asb-skill-collections. It costs 33 tokens per session (1,874 once invoked), scanned A, original, Apache-2.0.

An analysis of ATAC-seq data that estimates which transcription factors are bound to DNA differently between experimental conditions. It uses footprint patterns, where factor binding can leave a dip in sequencing insertions, at known binding sites.

In plain words
What is it for?
Use it to compare transcription-factor occupancy between treatments, time points, or cell states from aligned ATAC-seq files.
Why use it?
It distinguishes changes in likely transcription-factor binding from general changes in open chromatin.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to compare transcription-factor occupancy between treatments, time points, or cell states from aligned ATAC-seq files.

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Install with agentmods
npx agentmods add skills/holobiomicslab/asb-skill-collections/differential-tf-occupancy-analysis
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.

Any agent
npx skills add HolobiomicsLab/asb-skill-collections --skill differential-tf-occupancy-analysis
Clone the repo
git clone --depth 1 https://github.com/HolobiomicsLab/asb-skill-collections

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for differential-tf-occupancy-analysis

README.md
[![agentmods](https://agentmods.dev/badge/skills/holobiomicslab/asb-skill-collections/differential-tf-occupancy-analysis/github.svg)](https://agentmods.dev/skills/holobiomicslab/asb-skill-collections/differential-tf-occupancy-analysis)
Your own site
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agentmods 80×15 button for differential-tf-occupancy-analysis

Your own site · 80×15
<a href="https://agentmods.dev/skills/holobiomicslab/asb-skill-collections/differential-tf-occupancy-analysis"><img src="https://agentmods.dev/badge/skills/holobiomicslab/asb-skill-collections/differential-tf-occupancy-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,874 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00033 $0.01874
Opus 5 $0.00016 $0.00937
Sonnet 5 $0.00007 $0.00375
Haiku 4.5 $0.00003 $0.00187

Measured 9d ago against content hash b1b0c73a11a1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

differential-tf-occupancy-analysis 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 9d ago.

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.

collections/epigenomics/v1/skills/differential-tf-occupancy-analysis/SKILL.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

differential-tf-occupancy-analysis

Summary

Identify transcription factors with significantly altered binding occupancy between two ATAC-seq conditions by correcting for Tn5 insertion bias, computing footprint enrichment scores, and performing differential binding detection at known transcription factor binding sites (TFBS). This skill leverages the visible depletion of Tn5 insertions around protein-bound sites (footprints) to quantify condition-specific changes in TF occupancy.

When to use

You have aligned ATAC-seq BAM files and peak annotations from two or more experimental conditions (e.g., treated vs. control, different timepoints, or different cell states) and want to discover which transcription factors show statistically significant changes in chromatin binding occupancy between those conditions, not just differences in open chromatin accessibility.

When NOT to use

  • Input is single-condition ATAC-seq data with no biological replicate or comparison group — differential analysis requires at least two conditions.
  • The ATAC-seq peaks were generated from single-cell clusters without adequate pseudobulk aggregation; TOBIAS requires sufficient sequencing depth per condition to detect footprints reliably.
  • You are interested only in differences in open chromatin peaks, not in transcription factor binding occupancy; standard peak-calling and differential accessibility tools (e.g., DESeq2 on peak counts) are more appropriate.

Inputs

  • BAM files (aligned ATAC-seq reads, one per condition)
  • Peak annotations in BED format (open chromatin regions)
  • Reference genome FASTA file
  • Motif database (JASPAR, HOCOMOCO, or similar format supported by TOBIAS)

Outputs

  • Uncorrected and bias-corrected BigWig files (.bw) of Tn5 insertion signal per condition
  • Footprint score BigWig files (.bw) per condition
  • BINDetect differential occupancy results table (.tsv) with TF names, footprint scores, fold-changes, and statistical significance metrics (p-values, adjusted p-values)
  • PDF or PNG summary visualizations showing top differential TFs and representative footprint patterns

Read the full file on GitHub · 103 lines

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. 9d ago First seen · 103 lines · 33 tokens per session scan A b1b0c73a11a1

Subscribe to this mod's changes

differential-tf-occupancy-analysis is a skill published in the GitHub repository HolobiomicsLab/asb-skill-collections (15 stars, last pushed yesterday), licensed Apache-2.0. It adds 33 tokens to every session and 1,874 once invoked, about $0.0002 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 2026-09-03.

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