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Is the 5S RNA a primitive ribosomal sequence?

R N Nazar, W W Wong

Proceedings of the National Academy of Sciences of the United States of America

|September 1, 1985

Summary

A cluster of 55 RNA-like sequences within larger ribosomal RNAs suggests gene amplification played a role in their evolution. This finding points to an evolutionary link between 55 rRNA and larger ribosomal RNA molecules.

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Area of Science:

Molecular Biology
Evolutionary Biology
Genetics

Background:

Ribosomal RNAs (rRNAs) are essential components of ribosomes, the cellular machinery responsible for protein synthesis.
The structure and evolution of eukaryotic rRNAs, particularly the larger rRNA molecules like 26S and 28S rRNAs, are complex and not fully understood.

Purpose of the Study:

To investigate the evolutionary origins of larger ribosomal RNAs (rRNAs) in eukaryotic organisms.
To explore the potential role of gene amplification in the development of rRNA structure.
To examine the evolutionary relationship between specific RNA sequences and larger rRNA molecules.

Main Methods:

Bioinformatic analysis of rRNA sequences from diverse eukaryotic species.
Comparative genomics to identify conserved and variable regions within rRNA genes.
Phylogenetic analysis to infer evolutionary relationships.

Main Results:

Identification of a tandemly arranged cluster containing 55 RNA-like sequences.
Localization of this cluster within the central region of 26S to 28S rRNAs across various eukaryotes.
Evidence suggesting these sequences may have arisen through gene amplification events.

Conclusions:

The presence of the 55 RNA-like sequence cluster supports the hypothesis that larger rRNAs evolved partly through gene amplification.
An intriguing evolutionary relationship is suggested between the 55 rRNA-like sequences and the larger rRNA molecules.
This finding provides new insights into the evolutionary mechanisms shaping rRNA genes.

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