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Updated: May 13, 2026
Analysis of Embryonic and Larval Zebrafish Skeletal Myofibers from Dissociated Preparations
Published on: November 13, 2013
Knockdown of cathepsin D in zebrafish fertilized eggs determines congenital myopathy
Carlo Follo1, Matteo Ozzano1, Claudia Montalenti1
1*Laboratorio di Patologia Molecolare, Dipartimento di Scienze della Salute dell'Università del Piemonte Orientale, Via Solaroli 17, 28100 Novara, Italy.
Abstract:
CD (cathepsin D) is a ubiquitous lysosomal hydrolase involved in a variety of pathophysiological functions, including protein turnover, activation of pro-hormones, cell death and embryo development. CD-mediated proteolysis plays a pivotal role in tissue and organ homoeostasis. Altered expression and compartmentalization of CD have been observed in diseased muscle fibres. Whether CD is actively involved in muscle development, homoeostasis and dystrophy remains to be demonstrated. Zebrafish (Danio rerio) is emerging as a valuable 'in vivo' vertebrate model for muscular degeneration and congenital myopathies. In this work, we report on the perturbance of the somitic musculature development in zebrafish larvae caused by MPO (morpholino)-mediated silencing of CD in oocytes at the time of fertilization. Restoring CD expression, using an MPO-non-matching mutated mRNA, partially rescued the normal phenotype, confirming the indispensable role of CD in the correct development and integrity of the somitic musculature. This is the first report showing a congenital myopathy caused by CD deficiency in a vertebrate experimental animal model.
Insights
Cathepsin D (CD) deficiency in zebrafish causes congenital myopathy by disrupting muscle development. Restoring CD expression partially rescues normal muscle integrity, highlighting CD's crucial role in somitic musculature.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Cathepsin D (CD) is a lysosomal hydrolase crucial for various physiological processes, including protein turnover and cell death.
- Altered CD expression is linked to muscle diseases, but its direct role in muscle development and dystrophy is not fully understood.
- Zebrafish serve as a valuable vertebrate model for studying muscular degeneration and congenital myopathies.
Purpose of the Study:
- To investigate the role of Cathepsin D in the development and integrity of somitic musculature using a zebrafish model.
- To determine if CD deficiency leads to congenital myopathy in a vertebrate system.
Main Methods:
- Morpholino (MPO)-mediated silencing of CD in zebrafish oocytes to disrupt gene expression during early development.
- Utilizing zebrafish (Danio rerio) as an in vivo model system.
- Attempting to rescue the observed phenotype by restoring CD expression using mutated mRNA.
Main Results:
- Silencing CD in zebrafish oocytes perturbed somitic musculature development, leading to a congenital myopathy phenotype.
- Partial rescue of normal muscle development and integrity was observed when CD expression was restored.
- This study provides the first evidence of a congenital myopathy caused by CD deficiency in a vertebrate model.
Conclusions:
- Cathepsin D is indispensable for the correct development and integrity of somitic musculature in zebrafish.
- CD deficiency can cause congenital myopathy, underscoring its importance in muscle homoeostasis.
- Zebrafish are a suitable model for studying CD-related muscle disorders.
