Is it possible that cells have had more than one origin?

被引:18
作者
de Farias, Savio Torres [1 ,2 ]
Jose, Marco, V [3 ]
Prosdocimi, Francisco [3 ,4 ]
机构
[1] Univ Fed Paraiba, Lab Genet Evolut Paulo Leminski, Ctr Ciencias Exatas & Nat, Joao Pessoa, Paraiba, Brazil
[2] Network Researchers Chem Evolut Life NoRCEL, Leeds LS7 3RB, W Yorkshire, England
[3] Univ Nacl Autonoma Mexico, Theoret Biol Grp, Inst Invest Biomed, Mexico City 04510, DF, Mexico
[4] Univ Fed Rio de Janeiro, Lab Biol Teor & Sistemas, Inst Bioquim Med Leopoldo Meis, Rio De Janeiro, Brazil
关键词
Monophyly; Progenotes; Membrane evolution; Origin of biological systems;
D O I
10.1016/j.biosystems.2021.104371
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Cells occupy a prominent place in the history of life in Earth. The central role of cellular organization can be understood by the fact that ?cellular life? is often used as a synonym for life itself. Thus, most characteristics used to define cell overlap with those ones used to define life. However, innovative scenarios for the origin of life are bringing alternative views to describe how cells may have evolved from the open biological systems named progenotes. Here, using a logical and conceptual analysis, we re-evaluate the characteristics used to infer a single origin for cells. We argue that some evidences used to support cell monophyly, such as the presence of elements from the translation mechanism together with the universality of the genetic code, actually indicate a unique origin for all ?biological systems?, a term used to define not only cells, but also viruses and progenotes. Besides, we present evidence that at least two biochemical pathways as important as (i) DNA replication and (ii) lipid biosynthesis are not homologous between Bacteria and Archaea. The identities observed between the proteins involved in those pathways along representatives of these two ancestral domains of life are too low to indicate common genic ancestry. Altogether these facts can be seen as an indication that cellular organization has possibly evolved two or more times and that LUCA (the Last Universal Common Ancestor) may not have existed as a cellular entity. Thus, we aim to consider the possibility that different strategies acquired by biological systems to exist, such as viral, bacterial and archaeal were most likely originated independently from the evolution of different progenote populations.
引用
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页数:8
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