Reference genomes hg19 and hg38 are used for standard chromosomes. The preferred reference genome can always be selected when launching a new analysis.
The following alternate loci were removed from hg19 :
With regard to the mitochondrial genome, in VarSome Clinical when the analysis is launched from fastq sample(s), using either hg19 or hg38, any mitochondrial sequences will be aligned to the standard mitochondrial genome (GenBank number: NC_120920.1), which is included in the hg38 human genome. For more details please see the Mitochondrial genome versions.
The pseudoautosomal of chromosome Y have been masked in hg19. This is the default in hg38 which ships with the pseudoautosomal regions masked, and we have made the same modification on hg19.