Emergence of template-and-sequence-directed (TSD) syntheses: I. A bio-geochemical model

Noam Lahav*, Shlomo Nir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A biogeochemical model for the evolution of template-and-sequence-directed (TSD) syntheses of biological templates (proto-RNAs) and catalysts (peptides) is described. A fluctuating environment characterized by hydrating (cool) and dehydrating (warm) phases with cycles of consecutive organic reactions, as well as a constant supply of the polymeric building blocks is assumed. The scenario starts with the catalyzed formation of a primordial population of small random peptides, based on the relatively-ineffective mineral catalysts. The resulting peptides initiate a catalytic takeover process, during which the catalytic functions are gradually taken over by peptides. The evolution of TSD peptides is based on a combination of Lahav's (1991) co-evolution and Möller and Janssen's (1990) specific recognition sites hypotheses. During the emergence of TSD systems the fraction of TSD peptides and proto-RNA constituents rises from almost insignificance to dominance in a TSD Reactions Takeover. The TSD system is characterized by autocatalysis, positive feedback loops and a primordial genetic code. The model is the basis for a computer program (Part II of present series).

Original languageEnglish
Pages (from-to)377-395
Number of pages19
JournalOrigins of Life and Evolution of Biospheres
Volume27
Issue number4
DOIs
StatePublished - 1997

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