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The Ribosome Biogenesis Factor Ltv1 Is Essential for Digestive Organ Development and Definitive Hematopoiesis in
Chong Zhang1, Rui Huang1, Xirui Ma1
1Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, State Key Laboratory Breeding Base of Eco-Environments and Bio-Resources of the Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, China.
Frontiers in Cell and Developmental Biology
|October 25, 2021
Summary
The LTV1 gene is crucial for ribosome biogenesis and development of digestive organs and blood cells in zebrafish. Its disruption causes developmental defects independently of the P53 pathway.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- Ribosome biogenesis is essential for cellular function.
- Ribosomal dysfunction causes ribosomopathies, leading to developmental abnormalities.
- Zebrafish models are valuable for studying gene function and developmental defects.
Purpose of the Study:
- To investigate the role of the LTV1 gene in ribosome biogenesis and development.
- To determine the P53 dependency of LTV1-related developmental phenotypes.
Main Methods:
- CRISPR/Cas9 technology was used to knock out the ltv1 gene in zebrafish.
- Phenotypic analysis of ltv1-deficient zebrafish embryos was performed.
- P53 pathway involvement was assessed by monitoring P53 levels and p53 target gene expression, and through p53 knockdown experiments.
Main Results:
- Zebrafish ltv1 knockout (ltv1Δ14/Δ14) resulted in disrupted ribosome biogenesis and embryonic lethality.
- ltv1Δ14/Δ14 embryos exhibited hypoplastic craniofacial cartilage, digestive organs, and impaired hematopoiesis.
- Defects were attributed to impaired cell proliferation, not apoptosis.
- P53 protein levels and p53 target gene expression were upregulated, but p53 knockdown did not rescue phenotypes.
Conclusions:
- LTV1 is essential for zebrafish development, particularly for digestive organ and hematopoiesis formation.
- The observed developmental defects in ltv1 mutants are independent of the P53 pathway.
