# Bio Clip Seq Clip Alignment

> Align CLIP-seq reads to the genome with crosslink site awareness. Use when mapping preprocessed CLIP reads for peak calling.

- Skill: `fridrichmethod/bio-clip-seq-clip-alignment` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add fridrichmethod/bio-clip-seq-clip-alignment`
- Raw SKILL.md: https://api.skillmd.com/api/skills/fridrichmethod/bio-clip-seq-clip-alignment/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: FridrichMethod (https://skillmd.com/u/fridrichmethod)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/fridrichmethod/bio-clip-seq-clip-alignment

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# CLIP-seq Alignment

## STAR Alignment

```bash
STAR --runMode alignReads \
    --genomeDir STAR_index \
    --readFilesIn trimmed.fq.gz \
    --readFilesCommand zcat \
    --outFilterMultimapNmax 1 \
    --outFilterMismatchNmax 1 \
    --alignEndsType EndToEnd \
    --outSAMtype BAM SortedByCoordinate \
    --outFileNamePrefix clip_
```

## Bowtie2 Alternative

```bash
bowtie2 -x genome_index \
    -U trimmed.fq.gz \
    --very-sensitive \
    -p 8 \
    | samtools view -bS - \
    | samtools sort -o aligned.bam
```

## Post-Alignment Processing

```bash
# Index
samtools index aligned.bam

# Deduplicate with UMIs
umi_tools dedup \
    --stdin=aligned.bam \
    --stdout=deduped.bam
```

## Related Skills

- clip-preprocessing - Prepare reads
- clip-peak-calling - Call peaks


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