A dual-luciferase reporter system for studying recoding signals

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Translation coupling efficiency is crucial for gene expression regulation.
• Recoding mechanisms like frameshifting and readthrough modulate protein synthesis.
• Existing methods for measuring these efficiencies can be complex or lack internal controls.

Purpose of the Study:

• To develop a novel reporter system for measuring translation coupling efficiency.
• To establish a convenient and reliable assay for frameshifting and readthrough.
• To enable direct comparison of recoding efficiencies in vitro and in vivo.

Main Methods:

• A dual-luciferase reporter construct was engineered, placing a recoding sequence between Renilla and Firefly luciferase genes.
• Luciferase activities were measured in the same tube, allowing for normalization.
• The system was applied to study recoding in HIV-1 gag-pol, MMTV gag-pro, MuLV gag-pol, and human antizyme.

Main Results:

• The normalized ratio of Renilla to Firefly luciferase activity directly correlates with recoding efficiency.
• This dual-luciferase assay provides a reliable and convenient method for measuring translation coupling.
• The system is suitable for both in vitro and in vivo applications, facilitating direct comparisons.
• The assay demonstrated applicability to various biological systems, including viral and human genes.

Conclusions:

• The developed dual-luciferase reporter system is the first enzymatic assay suitable for in vitro translation coupling efficiency measurements.
• This assay offers a robust platform for high-throughput screening of translation signals.
• It allows for an intimate comparison of in vivo and in vitro recoding mechanisms from a single construct.