Fish transgene expression by direct injection into fish muscle.

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Gene expression analysis is crucial for understanding gene function and regulation.
• Reporter gene assays are a common method for quantifying promoter activity.
• In vivo methods offer insights into gene expression within a living organism.

Purpose of the Study:

• To evaluate the efficacy of a carp beta-actin promoter sequence in driving reporter gene expression in fish muscle.
• To establish a method for assessing promoter activity in tilapia (Oreochromis niloticus) muscle tissue.

Main Methods:

• Construction of plasmids containing carp beta-actin promoter linked to the CAT reporter gene (FV1 and FV2).
• Direct intramuscular injection of these constructs into tilapia.
• Muscle biopsy collection at 24 hours, 48 hours, and 7 days post-injection.
• Homogenization of muscle tissue and subsequent CAT enzyme activity assays.

Main Results:

• Successful detection of CAT activity in tilapia muscle samples following injection.
• Demonstration of gene expression driven by the carp beta-actin promoter in vivo.
• Variability in CAT activity observed across different time points and samples.

Conclusions:

• Direct injection of promoter-reporter constructs into fish muscle is a viable method for assessing promoter activity.
• The carp beta-actin promoter shows potential for driving gene expression in tilapia muscle.
• This approach provides a foundation for further studies on fish gene regulation and promoter characterization.