Abstract
Mitochondria are the key regulators of multiple vital cellular processes, including
apoptosis, calcium homeostasis, and the generation of ATP via the metabolic pathway
known as oxidative phosphorylation. Unlike other cellular organelles, mitochondria
contain one or more copies of their own genome (mtDNA). The mtDNA encodes a total
of 13 genes with critical functions in cellular metabolism. The energy required to
support the normal progress of preimplantation embryo development is provided in the
form of ATP generated by the mitochondria. It has been suggested that cellular bioenergetic
capacity and suboptimal levels of mitochondria-generated ATP could contribute to a
variety of embryo developmental defects, and therefore adversely affect in vitro fertilization
success rates. During this review, we discuss the role of mitochondria and their genome
during oogenesis and early embryo development. We also assess whether analysis of
mitochondria and their genome could be used as biomarkers to determine oocyte quality
and embryo viability.
Keywords
mitochondria - mitochondrial DNA - oocyte - embryo - biomarker