Resurrecting an Ancestral 5S rRNA
Author Information
Author(s): Lu Qing, Fox George E
Primary Institution: University of Houston
Hypothesis
Can ancestral RNA sequences predicted by parsimony be functionally valid?
Conclusion
The study demonstrates that an ancestral 5S rRNA sequence predicted by parsimony can function in a modern cellular context, while another predicted sequence did not show convincing functionality.
Supporting Evidence
- The node 1 sequence was found to be functional in the E. coli cellular context.
- Seven base changes were identified in the node 1 sequence compared to the modern V. proteolyticus 5S rRNA.
- The study confirmed that individual changes in the ancestral sequence could produce valid 5S rRNAs.
Takeaway
Scientists can recreate ancient RNA sequences to see if they work like they did long ago, and they found that one of the recreated sequences worked well, but another did not.
Methodology
The study used plasmid constructs to express ancestral 5S rRNA sequences in E. coli and assessed their functionality through growth rate assays and RNA incorporation analysis.
Limitations
The functionality of one of the predicted ancestral sequences could not be confirmed, suggesting that not all predictions are valid.
Digital Object Identifier (DOI)
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