Reporter-based assays for analyzing RNA interference in mammalian cells

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• RNA interference (RNAi) is a fundamental biological process for post-transcriptional gene silencing.
• Small RNAs, including short-hairpin RNAs (shRNAs), microRNAs (miRNAs), and small-interfering RNAs (siRNAs), mediate RNAi.
• While core RNAi machinery is known, accessory and regulatory factors remain underexplored.

Purpose of the Study:

• To develop and present quantitative reporter assays for analyzing RNA interference (RNAi) activity.
• To facilitate the identification of novel modulators, including proteins and small molecules, of the RNAi pathway.
• To provide versatile tools for studying gene expression regulation.

Main Methods:

• Development of two distinct quantitative reporter assay methods for RNAi.
• Method 1: Utilizes an enhanced green fluorescent protein (eGFP) reporter in transiently transfected cells.
• Method 2: Employs stably transfected cells with luciferase-based reporters, adaptable for 96-well plate formats.

Main Results:

• Both developed reporter assays effectively quantify RNAi activity.
• The assays demonstrate overlapping yet distinct utilities for modulator discovery.
• The luciferase-based assay is suitable for high-throughput screening.

Conclusions:

• The presented reporter assays are valuable tools for dissecting RNAi pathway regulation.
• These methods enable the discovery of novel proteins and small molecules that influence RNAi.
• Quantitative assessment of RNAi activity is crucial for understanding gene regulation.