Breath-giving cooperation: critical review of origin of mitochondria hypotheses

Biology Direct

Table 1 Possible combinations of components and scenarios discussed in this paper

	Host (cytoplasm and possible nucleus)
		Primitive eukaryote	Archaeon	Bacterium
Ecological relationship (inclusion mechanism)	syntrophy (+ / +) (engulfment)	• ox-tox model [68, 69]	• hydrogen hypothesis [45] • sulfur-cycling hypothesis [57]	• syntrophy hypothesis (+archaeon as nucleus) [48]
	predation (+ / -) (phagocytosis)	• pre-endosymbiont hypothesis [9, 41]	• phagocytosing archaeon theory [16]	• photosynthetic symbiont theory [36]
	parasitism (- / +) (invasion)	•	• origin-by-infection hypothesis [57]	•

The + and - signs in the second column indicate ecologically beneficial (+) or costly (−) interactions for the host/guest. For a more detailed view and more hypotheses included, see Additional file 1: Table S1

ISSN: 1745-6150