priors for calculting genotype likelihood using RNAseq data

Question

[prasundutta87]

Can anyone point me to a literature or explain the need of population priors during genotype likelihood estimation using RNAseq data? I did get results connected to DNAseq. I am using bcftools mpileup (v1.4) for likelihood estimation and then genotype calling and variant calling using bcftools call (v1.4).

[Devon Ryan]

Why would variant calling on RNAseq be any different than that on DNAseq data in this respect?