A Dual Reporter Splicing Assay Using HaloTag-containing Proteins

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• mRNA splicing is a critical post-transcriptional process.
• Genetic variations can disrupt normal mRNA splicing, leading to disease.
• Accurate assessment of splicing efficiency is crucial for understanding genetic disorders.

Purpose of the Study:

• To develop and validate a novel minigene-based splicing assay.
• To quantitatively evaluate mRNA splicing efficiency using dual reporters.
• To investigate the impact of a specific mutation on CYBB gene splicing.

Main Methods:

• Developed a dual reporter minigene assay using luciferase and HaloTag.
• Monitored splicing events via luciferase activity and HaloTag protein analysis.
• Utilized SDS-PAGE for quantitative insights into mRNA species.
• Applied the assay to study a CYBB gene mutation in chronic granulomatous disease.

Main Results:

• The dual reporter minigene assay provides reliable estimates of splicing efficiency.
• Confirmed the assay's ability to detect both correctly and aberrantly spliced mRNA.
• Identified a G>C mutation at the 5'-splice donor site of CYBB intron 5.
• Demonstrated that this mutation alters the splicing balance of introns 4, 5, and 6.

Conclusions:

• The developed minigene assay is effective for studying mRNA splicing.
• This assay can quantify splicing efficiency and detect splicing defects.
• The identified CYBB mutation disrupts mRNA splicing, contributing to chronic granulomatous disease.
• The assay provides valuable insights into genotype-phenotype correlations in genetic diseases.