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Can GATK work directly on read and quality score data

Typically, we use GATK to call variants if the Bam files are available. However, now I only have read and quality scores data for several loci, but I would like to use GATK or Samtools to call the genotypes. Is it feasible? My data looks like

                                  Variant 1
Subject 1        AAAAACCC    HHHGGGFT (base quality score)   
Subject 2        AAAAC       HFFB@
Subject 3        CCCCCCC     DG?F@BB
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next-gen

you can use, STACKS or pyRAD for genotyping from fastq files.

Thanks for your suggestions.

I actually hope to see how the genotype-calling algorithm works in GATK.

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