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Updated: Jul 9, 2026
Using Caenorhabditis elegans to Screen for Tissue-Specific Chaperone Interactions
Published on: June 7, 2020
Growth-dependent effect of muscleblind knockdown on Caenorhabditis elegans
Li-Chun Wang1, Wan-Tzu Hung, Huichin Pan
1Department of Biomedical Sciences, Chung Shan Medical University, Taichung, Taiwan, ROC.
Abstract:
The muscleblind-like (MBNL) proteins are tissue-specific alternative splicing regulators. Dysfunction of MBNL has been implicated in the pathogenesis of expanded CUG repeats-associated myotonic dystrophy (DM). In this study, we describe the identification and functional characterization of a Caenorhabditis elegans muscleblind (CeMbl) gene. CeMbl is a single gene alternatively spliced to generate two isoforms (CeMBL-A and CeMBL-B). It displays a high homology with human MBNL1 in the C3H1 zinc finger domains. CeMbl transcripts are detected in larval and adult stages. However, inactivation of CeMbl by RNA-mediated interference results in muscle phenotype only at adulthood. Immunofluorescence staining using anti-vinculin antibody reveals that the organization of dense body is disrupted in affected worms. Our results demonstrate a growth-dependent requirement of CeMbl on muscle structure and function. They also provide a possible molecular basis for the developmentally regulated toxicity of expanded CUG repeats.
Insights
The Caenorhabditis elegans muscleblind (CeMbl) gene is crucial for adult muscle structure and function. Its inactivation disrupts muscle organization, highlighting a growth-dependent requirement and potential insights into myotonic dystrophy.
Area of Science:
- Molecular biology
- Genetics
- Developmental biology
Background:
- Muscleblind-like (MBNL) proteins regulate tissue-specific alternative splicing.
- MBNL protein dysfunction is linked to myotonic dystrophy (DM) pathogenesis.
- Expanded CUG repeats are associated with DM.
Purpose of the Study:
- Identify and functionally characterize the Caenorhabditis elegans muscleblind (CeMbl) gene.
- Investigate the role of CeMbl in muscle structure and function.
- Explore the developmental regulation of CeMbl's function.
Main Methods:
- RNA-mediated interference (RNAi) to inactivate CeMbl.
- Analysis of muscle phenotype in affected worms.
- Immunofluorescence staining using anti-vinculin antibody to assess dense body organization.
Main Results:
- CeMbl is alternatively spliced into two isoforms (CeMBL-A and CeMBL-B).
- CeMbl shows high homology to human MBNL1 in zinc finger domains.
- CeMbl inactivation causes muscle defects specifically in adult worms.
- Disruption of dense body organization was observed in affected worms.
Conclusions:
- CeMbl exhibits a growth-dependent requirement for maintaining muscle structure and function.
- The findings provide a potential molecular basis for the developmental toxicity associated with expanded CUG repeats.
- CeMbl serves as a model for studying MBNL protein function in muscle development and disease.
