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Trans-splicing in C. elegans generates the negative RNAi regulator ERI-6/7.
Sylvia E J Fischer1, Maurice D Butler, Qi Pan
1Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.
Nature
|September 12, 2008
Summary
Researchers identified mutations in the eri-6 and eri-7 genes in Caenorhabditis elegans, revealing a novel RNAi pathway regulator. This helicase protein controls both exogenous and endogenous RNA interference pathways.
Area of Science:
- Molecular Biology
- Genetics
- RNA Biology
Background:
- The RNA interference (RNAi) pathway utilizes small RNAs to regulate gene expression.
- Mutations affecting RNAi components can reveal pathway interactions and regulatory mechanisms.
Purpose of the Study:
- To identify novel regulators of small RNA pathways in Caenorhabditis elegans.
- To investigate the function of newly discovered genes involved in RNA interference.
Main Methods:
- Screening for Caenorhabditis elegans mutants with enhanced responses to double-stranded RNA (dsRNA).
- Genetic complementation analysis to identify mutations in eri-6 and eri-7.
- Analysis of pre-messenger RNA (pre-mRNA) processing, including trans-splicing and adenosine to inosine editing.
- Characterization of the ERI-6/7 protein as a superfamily I helicase.
Main Results:
- Isolation of mutations in two adjacent, divergently transcribed genes, eri-6 and eri-7.
- Discovery that eri-6 and eri-7 form a single functional mRNA (eri-6/7) through trans-splicing.
- Evidence of a double-stranded pre-mRNA intermediate formed via adenosine to inosine editing before splicing.
- The ERI-6/7 protein, a helicase, negatively regulates exogenous RNAi and participates in endogenous RNAi.
Conclusions:
- The eri-6/7 gene locus encodes a crucial regulator of RNA interference pathways.
- Nuclear pre-mRNA editing and trans-splicing are key steps in eri-6/7 mRNA maturation.
- The ERI-6/7 helicase plays a dual role in controlling both foreign and self-derived RNAi.
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