Which came first: the chicken, the egg, or guanine?

被引:2
|
作者
Kankia, Besik [1 ,2 ,3 ]
机构
[1] Ohio State Univ, Dept Chem & Biochem, Columbus, OH 43210 USA
[2] Ohio State Univ, Ctr RNA Biol, Columbus, OH 43210 USA
[3] Ilia State Univ, Inst Biophys, Tbilisi 0162, Georgia
关键词
quadruplex; G-tetrad; origin of life; emergence of evolution; proto-tRNA; primitive translation; G-QUADRUPLEXES; RNA; EVOLUTION; ORIGIN; DNA; LONG; OLIGONUCLEOTIDES; POLYMERIZATION; CHEMISTRY; ROLES;
D O I
10.1261/rna.079613.123
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The main goal of the origin of life (OoL) hypothesis is to reconstruct the missing link between the primordial soup and the extant biology. However, the OoL itself is just the initial part of the link representing the bootstrapping operation of Darwinian evolution. The rest of the link is the emergence of the evolution to the present day primary biological system-the ribosome-based translation apparatus. A valid hypothesis must (i) not invoke Darwinian evolution in the bootstrapping and (ii) transform the ab initio life form into the translation apparatus without violating the principle of continuity (i.e., only incremental steps without foresight). Currently, no such hypothesis exists. Here, I discuss the Quadruplex World hypothesis, which fully complies with these requirements and suggests a spontaneous emergence of the ab initio life form. The spontaneity of OoL arises from the physicochemical properties of guanine monomers in a manner of causal determinism: each step of the process (i.e., scaffolding, polymerization, and folding) is caused by the most recent past step such that in the end only the specific 3D architecture forms. The architecture (i) has a length-independent folding pattern; (ii) can play the role of the predecessor of tRNA and single-handedly conduct a primitive form of translation; and (iii) can evolve into the extant translation apparatus without any paradoxes.
引用
收藏
页码:1317 / 1324
页数:8
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