Skip to main content

Python module to manipulate the minimap2's CS tag

Project description

Licence Test Python PyPI Bioconda DOI

cstag

cstag is a Python library tailored for the manipulation and handling of minimap2's CS tags.

🌟 Features

  • cstag.call(): Generate a CS tag
  • cstag.shorten(): Convert a CS tag from its long to short format
  • cstag.lengthen(): Convert a CS tag from its short to long format
  • cstag.consensus(): Create a consensus CS tag from multiple CS tags
  • cstag.mask(): Mask low-quality bases within a CS tag
  • cstag.split(): Break down a CS tag into its constituent parts
  • cstag.revcomp(): Convert a CS tag to its reverse complement
  • cstag.to_sequence(): Reconstruct a reference subsequence from the alignment
  • cstag.to_vcf(): Generate a VCF file
  • cstag.to_html(): Produce an HTML representation

For comprehensive documentation, please visit our docs.
To add CS tags to SAM/BAM files, check out cstag-cli.

🛠 Installation

Using PyPI:

pip install cstag

Using Bioconda:

conda install -c bioconda cstag

💡 Usage

Generating CS Tags

import cstag

cigar = "8M2D4M2I3N1M"
md = "2A5^AG7"
seq = "ACGTACGTACGTACG"

print(cstag.call(cigar, md, seq))
# :2*ag:5-ag:4+ac~nn3nn:1

cstag.call(cigar, md, seq, long=True)
# =AC*ag=TACGT-ag=ACGT+ac~nn3nn=G

Shortening or Lengthening CS Tags

import cstag

# Convert a CS tag from long to short
cs_tag = "=ACGT*ag=CGT"

cstag.shorten(cs_tag)
# :4*ag:3


# Convert a CS tag from short to long
cs_tag = ":4*ag:3"
cigar = "8M"
seq = "ACGTACGT"

cstag.lengthen(cs_tag, cigar, seq)
# =ACGT*ag=CGT

Creating a Consensus

import cstag

cs_tags = ["=ACGT", "=AC*gt=T", "=C*gt=T", "=C*gt=T", "=ACT+ccc=T"]
positions = [1, 1, 2, 2, 1]

cstag.consensus(cs_tags, positions)
# =AC*gt*T

Masking Low-Quality Bases

import cstag

cs_tag = "=ACGT*ac+gg-cc=T"
cigar = "5M2I2D1M"
qual = "AA!!!!AA"
phred_threshold = 10
cstag.mask(cs_tag, cigar, qual, phred_threshold)
# =ACNN*an+ng-cc=T

Splitting a CS Tag

import cstag

cs_tag = "=ACGT*ac+gg-cc=T"
cstag.split(cs_tag)
# ['=ACGT', '*ac', '+gg', '-cc', '=T']

Reverse Complement of a CS Tag

import cstag

cs_tag = "=ACGT*ac+gg-cc=T"
cstag.revcomp(cs_tag)
# =A-gg+cc*tg=ACGT

Reconstructing the Reference Subsequence

import cstag
cs_tag = "=AC*gt=T-gg=C+tt=A"
cstag.to_sequence(cs_tag)
# ACTTCTTA

Generating a VCF Report

import cstag
cs_tag = "=AC*gt=T-gg=C+tt=A"
chrom = "chr1"
pos = 1
print(cstag.to_vcf(cs_tag, chrom, pos))
"""
##fileformat=VCFv4.2
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO
chr1	3	.	G	T	.	.	.
chr1	4	.	TGG	T	.	.	.
chr1	5	.	C	CTT	.	.	.
"""

The multiple CS tags enable reporting of the variant allele frequency (VAF).

import cstag
cs_tags = ["=ACGT", "=AC*gt=T", "=C*gt=T", "=ACGT", "=AC*gt=T"]
chroms = ["chr1", "chr1", "chr1", "chr2", "chr2"]
positions = [2, 2, 3, 10, 100]
print(cstag.to_vcf(cs_tags, chroms, positions))
"""
##fileformat=VCFv4.2
##INFO=<ID=DP,Number=1,Type=Integer,Description="Total Depth">
##INFO=<ID=RD,Number=1,Type=Integer,Description="Depth of Ref allele">
##INFO=<ID=AD,Number=1,Type=Integer,Description="Depth of Alt allele">
##INFO=<ID=VAF,Number=1,Type=Float,Description="Variant allele frequency (AD/DP)">
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO
chr1	4	.	G	T	.	.	DP=3;RD=1;AD=2;VAF=0.667
chr2	102	.	G	T	.	.	DP=1;RD=0;AD=1;VAF=1.0
"""

Generating an HTML Report

import cstag
from pathlib import Path

cs_tag = "=AC+ggg=T-acgt*at~gt10ag=GNNN"
description = "Example"

cs_tag_html = cstag.to_html(cs_tag, description)
Path("report.html").write_text(cs_tag_html)
# Output "report.html"

You can visualize mutations indicated by the CS tag using the generated report.html file as shown below:

image

📣 Feedback and Support

For questions, bug reports, or other forms of feedback, we'd love to hear from you!
Please use GitHub Issues for all reporting purposes.

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

cstag-0.6.2.tar.gz (14.6 kB view hashes)

Uploaded Source

Built Distribution

cstag-0.6.2-py3-none-any.whl (17.5 kB view hashes)

Uploaded Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page