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Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado 80309, USA and Colorado Reproductive Endocrinology, Rose Medcial Center, Denver, Colorado 80220, USA
Correspondence should be addressed to J Van Blerkom, Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado 80309, USA; Email: vanblerk{at}spot.colorado.edu
Mitochondria are the most abundant organelles in the mammalian oocyte and early embryo. While their role in ATP production has long been known, only recently has their contribution to oocyte and embryo competence been investigated in the human. This review considers whether such factors as mitochondrial complement size, mitochondrial DNA copy numbers and defects, levels of respiration, and stage-specific spatial distribution, influence the developmental normality and viability of human oocytes and preimplantation-stage embryos. The finding that mitochondrial polarity can differ within and between oocytes and embryos and that these organelles may participate in the regulation of intracellular Ca2+homeostasis are discussed in the context of how focal domains of differential respiration and intracellular-free Ca2+regulation may arise in early development and what functional implications this may have for preimplantation embryogenesis and developmental competence after implantation.
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