MITOCHONDRIAL CROSSROADS. “Mechanisms underlying maintenance and accumulation of damaged somatic stem cells should act in diametrically opposite directions in gametes, where they mediate selection of the fittest to effect reproduction. The differential reliance of somatic stem cells and gametes on mitochondrial respiration for ATP production may be at least one such mechanism.”
http://www.sciencedirect.com/science/article/pii/S193459091500209X