摘要: Eukaryogenesis, the sequence of evolutionary events occurring between FECA and LECA (respectively the First and Last Eukaryotic Common Ancestors), is one of the most radical transition in life evolution. FECA was probably born from a syntrophic association of one Asgard archaeon, one alpha-proteobacterium, and gene transfers from other bacteria in an oxic-anoxic transition zone, possibly in the Archean. However, the timing and relative order of evolution of cellular features characterizing LECA, such as the nucleus, endomembranes, cytoskeleton, and mitochondria, remain debated. Estimations for the age of LECA range from 1.9 Ga to 0.7 Ga, depending on molecular clocks and interpretation of the fossil record.New microfossil assemblages from the Paleoproterozoic McArthur basin of Australia reveal an ecosystem with cyanobacterial mats, diverse unidentified vegetative cells and cysts, and ornamented …
参考文章(0)