Try Mitomaster. Select the SNV Query tab and enter variants as shown in the examples on the right hand panel.
I am not sure what you mean by annotation but have you tried Haplogrep2?
You can upload your fasta and you get variants from the rCRS and haplogroup assignments.
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For the Human mitochondrial sample, i had done the annotation of the variants using SnpEff. From SnpEff I got the syn and non-syn information.
Still, I wanted to know what would the effect of these variations in some pathways.