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Molecular determinants and evolutionary dynamics of wobble splicing
Jianning Lv1, Yun Yang, Heng Yin
1Institute of Biochemistry, College of Life Sciences, Zhejiang University, Zijingang Campus, Hangzhou, Zhejiang, China.
Molecular Biology and Evolution
|February 18, 2009
Summary
Wobble splicing, a type of alternative splicing, is driven by coevolution of splice sites and cis elements. This study reveals evolutionary shifts in wobble splicing mechanisms over 300 million years of insect evolution.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Genetics
Background:
- Alternative splicing at tandem splice sites (wobble splicing) is common but its mechanisms are unclear.
- Synaptotagmin I was used as a model to study wobble splicing evolution in insects.
Purpose of the Study:
- To investigate the evolutionary mechanisms of wobble splicing over 300 million years.
- To understand how synonymous variations and cis-elements influence wobble splicing specificity.
Main Methods:
- Phylogenetic analysis of synaptotagmin I across insect species.
- Mutagenesis experiments to assess the impact of splice site variations.
- Comparative genomics and hybrid minigene analysis in Culex pipiens.
Main Results:
- Species-specific wobble splicing correlates with synonymous variation at tandem splice sites.
- Artificial mutations disrupting splice acceptor sites led to loss of wobble splicing.
- Evolutionary analysis in Culex pipiens showed a shift from 3' donor to 5' acceptor in alternative splicing.
Conclusions:
- Tandem splice site selection is likely driven by coevolution with cis-element sequences.
- An evolutionary model for wobble splicing is proposed based on these findings.
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