Research on mitochondrial dna heteroplasmy in human induced pluripotent stem cells is being conducted, with some studies focusing on the m.13513g>a mutation associated with melas. The use of genome editing tools, such as talen and mitoarcus nucleases, is being explored for its potential to modify mitochondrial dna. The field of mitochondrial genome editing is an area of ongoing research and development, with various studies and protocols being investigated.