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The evolution mechanism of intron length
Qiang Zhang1, Hong Li1, Xiao-Qing Zhao2
1Laboratory of Theoretical Biophysics, School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China.
Genomics
|July 25, 2016
Summary
Introns regulate gene expression through RNA-RNA interactions with mRNA. This study reveals intron-mRNA sequence matching and co-evolution, suggesting functional roles beyond gene expression.
Area of Science:
- Genetics
- Molecular Biology
- Bioinformatics
Background:
- Introns, non-coding sequences within genes, were discovered in 1977.
- Early research indicated introns positively influence gene expression.
Purpose of the Study:
- To investigate the mechanism of intron-mediated gene expression and regulation.
- To analyze the interaction between intron and messenger RNA (mRNA) sequences.
- To explore the evolutionary patterns of intron length.
Main Methods:
- Utilized the Smith-Waterman algorithm for local sequence alignment between introns and mRNA.
- Analyzed the distribution of optimal matching regions in ribosomal protein gene introns across 27 species.
- Compared sequence features of optimal matching regions with microRNA (miRNA) and small interfering RNA (siRNA).
Main Results:
- Identified specific interaction sites between intron and mRNA sequences.
- Found that intron length evolution progresses from the 5' to 3' end, adding structural units.
- Observed conserved structural units (~60bp) within introns, with variable linker sequences.
- Noted that the distribution of length and matching rates of optimal segments resemble miRNA and siRNA features.
Conclusions:
- Intron-mRNA sequence interaction represents a functional RNA-RNA interaction.
- Introns and mRNA sequences are co-evolved and interact to perform biological functions.
- This interaction provides a potential mechanism for gene expression regulation and intron evolution.
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