“A high incidence of mid- and late pregnancy loss is also a common feature that often remains unrecognized (in mitochondrial disease)”
This information comes from The National Center for Biotechnology Information: Gene Reviews: Mitochondrial Disorders Overview.
and more info can be found here:
Association of mutations in SCO2, a cytochrome c oxidase assembly gene, with early fetal lethality.
The antioxidants (coenzyme Q10) in materno-fetal physiopathology