dna-methylation-block-detection-analysis

dna-methylation-block-detection-analysis is a skill for Claude Code, Codex from HolobiomicsLab/asb-skill-collections. It costs 46 tokens per session (1,486 once invoked), scanned A, original, Apache-2.0.

A method for finding contiguous blocks of DNA sites that show coordinated methylation changes in normalized 450K or EPIC array data. A block is a larger region, rather than a single CpG site.

In plain words
What is it for?
Use it to compare methylation blocks between defined sample groups after quality control, normalization, and batch correction.
Why use it?
It reveals broad regional patterns that may be missed when testing individual sites or smaller regions.

Skill for Claude CodeCodex

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

Good fit Use it to compare methylation blocks between defined sample groups after quality control, normalization, and batch correction.

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Install with agentmods
npx agentmods add skills/holobiomicslab/asb-skill-collections/dna-methylation-block-detection-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 dna-methylation-block-detection-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.

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README.md
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Your own site
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<a href="https://agentmods.dev/skills/holobiomicslab/asb-skill-collections/dna-methylation-block-detection-analysis"><img src="https://agentmods.dev/badge/skills/holobiomicslab/asb-skill-collections/dna-methylation-block-detection-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,486 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 $0.00046 $0.01486
Opus 5 $0.00023 $0.00743
Sonnet 5 $0.00009 $0.00297
Haiku 4.5 $0.00005 $0.00149

Measured 9d ago against content hash c247ed607031, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

dna-methylation-block-detection-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/dna-methylation-block-detection-analysis/SKILL.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

dna-methylation-block-detection-analysis

Summary

Detection and visualization of differentially methylated blocks (DMBs) in EPIC and 450k DNA methylation array data using ChAMP's champ.Block() function. This skill identifies contiguous genomic regions with coordinated differential methylation patterns that may represent functional regulatory units.

When to use

Apply this skill when you have loaded normalized methylation data from EPIC or 450k arrays and need to identify differentially methylated blocks rather than individual CpG sites or DMRs. Use it after quality control, normalization, and batch correction are complete, and when you have defined comparison groups (case vs. control) in your sample metadata.

When NOT to use

  • Input data has not been normalized and batch-corrected; quality control and preprocessing must precede block detection
  • You need single-CpG-level differential methylation analysis rather than regional/block-level patterns—use probe-level DMR detection (champ.DMR with Probe Lasso, Bumphunter, or DMRcate) instead
  • Sample size is very small (< 4 samples per group) or phenotype groups are not clearly defined in metadata

Inputs

  • Normalized beta-value matrix (numeric matrix with CpG probes as rows, samples as columns)
  • ExpressionSet object containing methylation data and sample metadata
  • Sample phenotype/group labels (e.g., case/control assignments)

Outputs

  • Block detection results table (genomic coordinates, effect sizes, p-values)
  • Block.GUI() interactive visualization interface
  • Differentially methylated block annotations with probe ranges and statistical summaries

How to apply

Load the preprocessed methylation dataset (beta-value matrix or ExpressionSet object) into the R environment. Call champ.Block() with the appropriate arraytype parameter (either 'EPIC' or '450K') to detect contiguous blocks of differential methylation across your sample groups. The function will perform block-level statistical testing to identify regions where multiple adjacent probes show coordinated methylation differences. Launch the Block.GUI() interactive visualization interface to inspect, filter, and explore detected blocks by genomic location, effect size, and statistical significance. Verify output by checking that block boundaries align with genomic features and that the number and magnitude of detected blocks are consistent with the expected biology of your comparison (note: negative results—absence of blocks—may be valid for certain datasets, particularly simulation data).

Read the full file on GitHub · 99 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 · 99 lines · 46 tokens per session scan A c247ed607031

Subscribe to this mod's changes

dna-methylation-block-detection-analysis is a skill published in the GitHub repository HolobiomicsLab/asb-skill-collections (15 stars, last pushed yesterday), licensed Apache-2.0. It adds 46 tokens to every session and 1,486 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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