This is just too weird, I can’t imagine a mechanism for sperm to egg transfer of mitochondria, scratching head...
I remember being taught that the MtDNA had to come from the mother, and her blood, through the umbilical cord, provided the mitochondria. If Dad is contributing this material, how is his mitochondria introduced?
This might be a window into an unexplored region of the Human genome...
Human sperm cells need mitochondria to energize their locomotion and then fertilization of an egg. These mitochondria are sometimes incorporated into the fertilized egg and then replicate in embryonic cells. The new discovery consists of proof that an inheritance of paternal mitochondria may result in a clinically proven disease, with additional proof that paternal mitochondria were fairly common in the cells of the studied family. Further research may establish that such inheritance of paternal mitochondria is widespread and of significance in human disease.