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The Presence in tRNA Molecule Sequences of the Double Hairpin, an Evolutionary Stage Through Which the Origin of this Molecule is Thought to have Passed

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The Presence in tRNA Molecule Sequences of the Double Hairpin, an Evolutionary Stage Through Which the Origin of this Molecule is Thought to have Passed

Content Provider	Springer Nature Link
Author	Branciamore, Sergio Giulio, Massimo
Copyright Year	2011
Abstract	We analyse 6,810 tRNAs, calculating the free energy of the corresponding double hairpin and ‘cigar’ secondary structures, for which we find a high thermodynamic and statistical significance. We also analyse these tRNAs for similarity and complementarity of their 5′ and 3′ halves or segments of them in intra-and inter-molecular comparisons. We find very clear signs that the two halves of tRNAs had an evident evolutionary relationship, although it is not totally clear whether this was a relationship of homology or complementarity between the 5′ and 3′ halves of tRNAs, even if there is strong evidence in favour of the homology hypothesis. Overall, these data favour models for the origin of the tRNA molecule postulating that a duplication event involving a hairpin structure as a precursor was involved in the origin of this molecule. Moreover, we interpret these results and favour the hypothesis that sees the assembly of two hairpin structures sharing a homology relationship as the intermediate evolutionary stage preceding the appearance of the cloverleaf structure of tRNA.
Starting Page	352
Ending Page	363
Page Count	12
File Format	PDF
ISSN	00222844
Journal	Journal of Molecular Evolution
Volume Number	72
Issue Number	4
e-ISSN	14321432
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-03-17
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Transitional stages Intermediate stages Evolutionary precursors Free energy (ΔG) RNA structures Models for tRNA origin Macroevolution Animal Genetics and Genomics Microbiology Evolutionary Biology Cell Biology Plant Genetics & Genomics Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Molecular Biology Ecology, Evolution, Behavior and Systematics

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The Presence in tRNA Molecule Sequences of the Double Hairpin, an Evolutionary Stage Through Which the Origin of this Molecule is Thought to have Passed