NAME¶

QTLtools extract - Data extraction mode.

SYNOPSIS¶

QTLtools extract [--vcf --bed --cov] relevant_file --out output_prefix [OPTIONS]

DESCRIPTION¶

Extract all the data from the provided files into one flat file. This will also impute all the missing data.

OPTIONS¶

--vcf [in.vcf|in.bcf|in.vcf.gz]

Genotypes in VCF/BCF format. At least one of --vcf --bed --cov is REQUIRED.

--bed quantifications.bed.gz

Molecular phenotype quantifications in BED format. At least one of --vcf --bed --cov is REQUIRED.

--cov covariates.txt

Covariates data. At least one of --vcf --bed --cov is REQUIRED.

--out filename_prefix

Output file name prefix. REQUIRED.

--region chr:start-end

Genomic region to be processed. E.g. chr4:12334456-16334456, or chr5.

OUTPUT FILES¶

.content.txt.gz

Flat file with samples in rows and all the extracted variables in columns.

.header.txt

Genomic locations of the extracted variables.

EXAMPLE¶

o

Extract genotypes, gene quantifications, and covariates from a certain region:

QTLtools extract --vcf genotypes.chr22.vcf.gz --bed genes.50percent.chr22.bed.gz --cov genes.covariates.pc50.txt.gz --region chr22:17000000-18000000 --out extract_output

SEE ALSO¶

QTLtools(1)

QTLtools website: <https://qtltools.github.io/qtltools>

BUGS¶

o

Versions up to and including 1.2, suffer from a bug in reading missing genotypes in VCF/BCF files. This bug affects variants with a DS field in their genotype's FORMAT and have a missing genotype (DS field is .) in one of the samples, in which case genotypes for all the samples are set to missing, effectively removing this variant from the analyses.

Please submit bugs to <https://github.com/qtltools/qtltools>

CITATION¶

Delaneau, O., Ongen, H., Brown, A. et al. A complete tool set for molecular QTL discovery and analysis. Nat Commun 8, 15452 (2017). <https://doi.org/10.1038/ncomms15452>

AUTHORS¶

Olivier Delaneau (olivier.delaneau@gmail.com), Halit Ongen (halitongen@gmail.com)