One thing about your question that I want to clarify? You can not prove your ancestry using DNA, you can only confirm your Genealogical trail using DNA to identify others who also share your Genealogical trail.
Add your DNA test information to WikiTree and WikiTree will populate your Ancestral trail with the appropriate DNA information. If Fern has a mtDNA test it would follow her mother, mothers, mothers mothers line back as far back as the profiles for those mothers that you have added. Same thing with auDNA and mtDNA and XDNA. If you fill in your limbs on WikiTree and end-up connecting to the tree, your DNA test information will continue to follow your lines back.
In your "DNA Connections" section of your profile, and on the profiles of your ancestors, your DNA test information will appear. As your work through your matches on your DNA testing site you can find their most distant ancestors on WikiTree and see their DNA information as well.
Download and then upload your raw DNA data to GEDmatch to share your DNA with others from all the DNA testing companies. If you have Y or mtDNA you will be able to upload it to a new YDNA and mtDNA database site sometime in December - www.mitoydna.org
On your profile or profiles of your matches ancestors you can click the GEDmatch compare feature (in the DNA Connections section on the profile) and compare yourself to them (or compare other kits) via WikiTrees integration with GEDmatch.