Saturation of recognition elements blocks evolution of new tRNA identities.

Abstract:

:Understanding the principles that led to the current complexity of the genetic code is a central question in evolution. Expansion of the genetic code required the selection of new transfer RNAs (tRNAs) with specific recognition signals that allowed them to be matured, modified, aminoacylated, and processed by the ribosome without compromising the fidelity or efficiency of protein synthesis. We show that saturation of recognition signals blocks the emergence of new tRNA identities and that the rate of nucleotide substitutions in tRNAs is higher in species with fewer tRNA genes. We propose that the growth of the genetic code stalled because a limit was reached in the number of identity elements that can be effectively used in the tRNA structure.

journal_name

Sci Adv

journal_title

Science advances

authors

Saint-Léger A,Bello C,Dans PD,Torres AG,Novoa EM,Camacho N,Orozco M,Kondrashov FA,Ribas de Pouplana L

doi

10.1126/sciadv.1501860

subject

Has Abstract

pub_date

2016-04-29 00:00:00

pages

e1501860

issue

4

issn

2375-2548

pii

1501860

journal_volume

2

pub_type

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