bqtools

A command-line utility for working with BINSEQ files.

Overview

bqtools provides tools to encode, decode, concatenate, and analyze BINSEQ (.bq) and VBINSEQ (.vbq) files. BINSEQ is a binary format designed for efficient storage of fixed-length DNA sequences, using 2-bit encoding for nucleotides. VBINSEQ is a binary format designed for efficient storage of variable-length DNA sequences with optional quality score support.

Features

• Encode: Convert FASTA or FASTQ files to a BINSEQ format
• Decode: Convert a BINSEQ file back to FASTA, FASTQ, or TSV format
• Cat: Concatenate multiple BINSEQ files
• Count: Count records in a BINSEQ file

Installation

From Cargo

bqtools can be installed using cargo, the Rust package manager:

cargo install bqtools

To install cargo you can follow the instructions on the official Rust website.

From Source

# Clone the repository
git clone https://github.com/arcinstitute/bqtools.git
cd bqtools

# Install
cargo install --path .

# Check installation
bqtools --help

Usage

# Get help information
bqtools --help

# Get help for specific commands
bqtools encode --help
bqtools decode --help
bqtools cat --help
bqtools count --help

Encoding

Convert FASTA/FASTQ files to BINSEQ format:

# Encode a single file to binseq
bqtools encode input.fastq -o output.bq

# Encode a single file to vbinseq
bqtools encode input.fastq -o output.vbq

# Encode paired-end reads
bqtools encode input_R1.fastq input_R2.fastq -o output.bq

# Encode paired-end reads to vbinseq
bqtools encode input_R1.fastq input_R2.fastq -o output.vbq

# Specify a policy for handling non-ATCG nucleotides
bqtools encode input.fastq -o output.bq -p r  # Randomly draw A/C/G/T for each N

# Use multiple threads for parallel processing
bqtools encode input.fastq -o output.bq -T 8

Available policies for handling non-ATCG nucleotides:

• i: Ignore sequences with non-ATCG characters
• p: Break on invalid sequences
• r: Randomly draw a nucleotide for each N (default)
• a: Set all Ns to A
• c: Set all Ns to C
• g: Set all Ns to G
• t: Set all Ns to T

Note: Input FASTQ files may be compressed.

Decoding

Convert BINSEQ files back to FASTA/FASTQ/TSV:

# Decode to FASTQ (default)
bqtools decode input.bq -o output.fastq

# Decode to FASTA
bqtools decode input.bq -o output.fa -f a

# Decode paired-end reads into separate files
bqtools decode input.bq --prefix output
# Creates output_R1.fastq and output_R2.fastq

# Specify which read of a pair to output
bqtools decode input.bq -o output.fastq -m 1  # Only first read
bqtools decode input.bq -o output.fastq -m 2  # Only second read

# Specify output format
bqtools decode input.bq -o output.tsv -f t  # TSV format

Concatenating

Combine multiple BINSEQ files:

bqtools cat file1.bq file2.bq file3.bq -o combined.bq

Counting

Count records in a BINSEQ file:

bqtools count input.bq

Searching

You can easily search for specific subsequences or regular expressions within BINSEQ files:

# See full options list
bqtools grep --help

# Search for a specific subsequence (in primary sequence)
bqtools grep input.bq -p "ATCG"

# Search for a regular expression (in primary)
bqtools grep input.bq -r "AT[CG]"

# Search for both a subsequence (in extended sequence) and a regular expression (in either)
bqtools grep input.bq -E "ATCG" -P "AT[CG]"