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I am trying to run CountCovariates in GATK. I downloaded the most recent dbsnp file from the broad institute site. The problem is it is not sorted in chromosomal order. I have vcf-tools installed and tried to sort using the -c command. It is telling me "Obsolete version of sort command installed, please run without the -c option." But, if I type in vcf-sort -h , the usage says the -c is available. I have checked to make sure we have the most recent version. I don't find the vcf-tools website to be very helpful. Could someone point me in the right direction or do you know where I can download a sorted vcf file? Is there another program that I can use?
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I’m not a sequencing expert. I’m a purification scientist who uses NGS to evaluate workflows my group develops. With this perspective, we think about the sample first and the NGS workflow second. The sequencer is an exceptionally honest reporter, but it can only report on what you give it, so whether you get clean, interpretable data from an NGS workflow is largely determined before you begin.
Here are nine questions we think about, in roughly the order they matter, before...06-18-2026, 07:11 AM -
Data variability is still an issue in sequencing technologies despite the advances in reproducibility and accuracy of these platforms. But the problem does not originate in the sequencing itself, but in the previous steps, before the sample reaches the sequencer.
The first step is collection, followed by preservation and sample preparation for analysis. Most scientists overlook those steps, but not being careful might just be skewing the experiment’s results.
...06-02-2026, 10:05 AM
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