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Published on: May 29, 2020
RNAi-mediated knock-down of the dopamine beta-hydroxylase gene changes growth of razor clams
Zhi Li1, Maoxiao Peng2, Deborah Mary Power3
1Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China.
Abstract:
Dopamine beta-hydroxylase (DβH) plays an essential role in the synthesis of catecholamines (CA) in neuroendocrine networks. In the razor clam, Sinonovacula constricta a novel gene for DβH (ScDβH-α) was identified that belongs to the copper type II ascorbate-dependent monooxygenase family. Expression analysis revealed ScDβH-α gene transcripts were abundant in the liver and expressed throughout development. Knock-down of ScDβH-α in adult clams using siRNA caused a reduction in the growth rate compared to control clams. Reduced growth was associated with strong down-regulation of gene transcripts for the growth-related factors, platelet derived growth factors A (PDGF-A) (P < 0.001) 24 h after ScDβH-α knock-down, vascular endothelial growth factor (VEGF1) (P < 0.001) and platelet derived growth factor B (PDGF-B-2) (P < 0.001) 24 h and 48 h after ScDβH-α knock-down and transforming growth factor beta (TGF-β1) (P < 0.001) 48 h and 72 h after ScDβH-α knock-down. Taken together the results suggest that the novel ScDβH-α gene through its role in CA synthesis is involved in growth regulation in the razor clam and possibly other bivalves.
Insights
A novel dopamine beta-hydroxylase (DβH) gene in razor clams regulates growth by influencing catecholamine synthesis. Knocking down this gene reduced growth and affected key growth factors.
Area of Science:
- Marine Biology
- Biochemistry
- Genetics
Background:
- Dopamine beta-hydroxylase (DβH) is crucial for catecholamine synthesis in neuroendocrine systems.
- A novel DβH gene, ScDβH-α, belonging to the copper type II ascorbate-dependent monooxygenase family, was identified in the razor clam, *Sinonovacula constricta*.
Purpose of the Study:
- To investigate the function of the novel ScDβH-α gene in razor clam growth and development.
- To explore the relationship between ScDβH-α, catecholamine synthesis, and growth-related factors.
Main Methods:
- Identification and characterization of the ScDβH-α gene.
- Analysis of ScDβH-α gene expression in different tissues and developmental stages.
- RNA interference (siRNA) to knock down ScDβH-α expression in adult clams.
- Measurement of growth rates and gene expression levels of growth factors (PDGF-A, VEGF1, PDGF-B-2, TGF-β1) post-knockdown.
Main Results:
- ScDβH-α gene transcripts were abundant in the liver and expressed throughout development.
- Knockdown of ScDβH-α significantly reduced the growth rate in adult razor clams.
- Reduced growth was strongly associated with the downregulation of growth-related factors including PDGF-A, VEGF1, PDGF-B-2, and TGF-β1.
Conclusions:
- The novel ScDβH-α gene plays a significant role in regulating growth in the razor clam, *Sinonovacula constricta*.
- This regulation is likely mediated through its involvement in catecholamine synthesis and its influence on key growth factors.
- The findings suggest a conserved role for DβH in growth regulation across bivalve species.
