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A periodic pattern of mRNA secondary structure created by the genetic code
Svetlana A Shabalina1, Aleksey Y Ogurtsov, Nikolay A Spiridonov
1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA. shabalin@ncbi.nlm.nih.gov
Nucleic Acids Research
|May 10, 2006
Summary
The genetic code
Area of Science:
- Molecular Biology
- Bioinformatics
- Genetics
Background:
- Messenger RNA (mRNA) molecules fold into secondary structures via self-interactions.
- The relationship between nucleotide sequence, amino acid sequence, and mRNA secondary structure is not fully understood.
- Previous hypotheses suggest a link, but comprehensive analysis was lacking.
Purpose of the Study:
- To conduct the first transcriptome-wide in silico analysis of human and mouse mRNA folding.
- To investigate the influence of the genetic code structure on mRNA secondary structure.
- To determine the role of nucleotide sequence and codon degeneracy in mRNA structure and stability.
Main Methods:
- Performed transcriptome-wide in silico analysis of mRNA folding in human and mouse.
- Analyzed nucleotide sequence patterns and dinucleotide relative abundances.
- Investigated the impact of synonymous codon usage and codon degeneracy on mRNA secondary structure.
Main Results:
- Identified a pronounced periodic pattern in nucleotide involvement in mRNA secondary structure.
- Demonstrated that the genetic code structure is the primary driver of this pattern.
- Found that third degenerate codon sites significantly contribute to mRNA stability.
- Observed preferential folding of functional mRNA domains (5'-UTR, CDS, 3'-UTR) and relaxed structures at start/stop codons.
Conclusions:
- The genetic code's structure intrinsically dictates mRNA secondary structure patterns.
- Synonymous codon selection may favor stable mRNA secondary structures, impacting transcript stability and translation.
- mRNA secondary structures are optimized to balance protein-coding requirements with RNA structural needs.
- Relaxed secondary structures at translation initiation and termination sites likely facilitate these processes.
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