Fishing the molecular bases of Treacher Collins syndrome
Andrea M J Weiner1, Nadia L Scampoli, Nora B Calcaterra
1Instituto de Biología Molecular y Celular de Rosario (IBR), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Área Biología General, Departamento de Ciencias Biológicas, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina.
Abstract:
Treacher Collins syndrome (TCS) is an autosomal dominant disorder of craniofacial development, and mutations in the TCOF1 gene are responsible for over 90% of TCS cases. The knowledge about the molecular mechanisms responsible for this syndrome is relatively scant, probably due to the difficulty of reproducing the pathology in experimental animals. Zebrafish is an emerging model for human disease studies, and we therefore assessed it as a model for studying TCS. We identified in silico the putative zebrafish TCOF1 ortholog and cloned the corresponding cDNA. The derived polypeptide shares the main structural domains found in mammals and amphibians. Tcof1 expression is restricted to the anterior-most regions of zebrafish developing embryos, similar to what happens in mouse embryos. Tcof1 loss-of-function resulted in fish showing phenotypes similar to those observed in TCS patients, and enabled a further characterization of the mechanisms underlying craniofacial malformation. Besides, we initiated the identification of potential molecular targets of treacle in zebrafish. We found that Tcof1 loss-of-function led to a decrease in the expression of cellular proliferation and craniofacial development. Together, results presented here strongly suggest that it is possible to achieve fish with TCS-like phenotype by knocking down the expression of the TCOF1 ortholog in zebrafish. This experimental condition may facilitate the study of the disease etiology during embryonic development.
Insights
Researchers developed a zebrafish model for Treacher Collins syndrome (TCS) by targeting the TCOF1 gene. This model mimics TCS phenotypes, aiding the study of craniofacial development mechanisms.
Area of Science:
- Developmental Biology
- Genetics
- Zebrafish Models
Background:
- Treacher Collins syndrome (TCS) is a genetic disorder affecting craniofacial development, primarily caused by TCOF1 gene mutations.
- Understanding TCS molecular mechanisms is challenging due to difficulties in animal models.
- Zebrafish offer a promising model for studying human diseases.
Purpose of the Study:
- To establish and validate zebrafish as a model for studying Treacher Collins syndrome.
- To investigate the role of the TCOF1 ortholog in zebrafish craniofacial development.
- To identify molecular targets involved in TCS pathogenesis.
Main Methods:
- In silico identification and cDNA cloning of the zebrafish TCOF1 ortholog.
- Analysis of Tcof1 expression patterns in developing zebrafish embryos.
- Induction of Tcof1 loss-of-function to observe phenotypic changes.
- Assessment of cellular proliferation and craniofacial development markers.
Main Results:
- The zebrafish TCOF1 ortholog shares structural similarities with mammalian counterparts.
- Tcof1 expression is localized to anterior embryonic regions, mirroring mouse patterns.
- Tcof1 loss-of-function in zebrafish resulted in phenotypes consistent with TCS.
- Reduced expression of cellular proliferation and craniofacial development genes was observed.
Conclusions:
- Zebrafish can effectively model Treacher Collins syndrome through TCOF1 gene knockdown.
- This zebrafish model facilitates the study of TCS etiology during embryonic development.
- The model aids in characterizing mechanisms underlying craniofacial malformations and identifying molecular targets.
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