Alignment Quality Control FAQs

Question 1

Can this skill be used for biological peak validation?

Accepted Answer

No. This skill is strictly for alignment-level quality control (technical metrics). It is not intended for biological signal validation, such as checking for peak enrichment or open chromatin regions.

Question 2

What does the Alignment Quality Control skill do?

Accepted Answer

This skill automates the technical evaluation of aligned BAM files from ChIP-seq and ATAC-seq experiments. It calculates critical metrics like read depth, mapping quality, PCR duplication rates, and mitochondrial contamination using industry-standard tools like samtools and Picard.

Question 3

Does this skill handle BAM file formatting issues?

Accepted Answer

Yes. It includes automated steps to check if BAM files are coordinate-sorted, have proper Read Groups (RG), and are indexed. It will automatically perform these fixes and create the necessary temporary files to ensure the QC metrics run correctly.

Question 4

When should I use this skill in my workflow?

Accepted Answer

You should use this skill immediately after read alignment and before any downstream processing like peak calling. It is designed to validate the performance of the aligner and ensure the data integrity of your BAM files.

Question 5

What kind of quality reports does it generate?

Accepted Answer

The skill generates a comprehensive visual report via MultiQC and a concise 'qc_summary.txt' file. This summary provides a clear PASS/WARN/FAIL status for each sample based on established genomic quality thresholds.

Alignment Quality Control

Alignment Quality Control

Key Features

Use Cases

Key Features

Use Cases