Optimized Protocol for High-Quality RNA Extraction from Grape Berry Skins Using Sorbitol Pre-Wash

Area of Science:

• Plant Molecular Biology
• Biotechnology

Background:

• Grape berry skins contain high levels of polysaccharides, phenolic compounds, sugars, and organic acids, which inhibit RNA extraction.
• Standard RNA isolation protocols and commercial kits are often ineffective for grape berry skins.
• Existing methods are inefficient and time-consuming for this specific plant tissue.

Purpose of the Study:

• To optimize RNA isolation from grape berry skins.
• To enhance RNA yield, purity, and integrity.
• To develop a reliable method for grapevine research and gene expression studies.

Main Methods:

• A sorbitol pre-wash step was incorporated into both a non-commercial RNA isolation protocol and a commercial kit.
• RNA yield and quality were assessed using RIN (RNA Integrity Number) values, Qubit, and Nanodrop measurements.
• The optimized method's efficacy was validated through RNA sequencing.

Main Results:

• The sorbitol pre-wash step significantly improved RNA yield and quality from grape berry skins.
• Higher RNA purity and integrity were observed, indicated by increased RIN values and improved spectrophotometric and fluorometric readings.
• RNA sequencing produced high-quality reads with low error rates, suitable for gene expression analysis.

Conclusions:

• Incorporating a sorbitol pre-wash step is an effective strategy to enhance RNA yield and quality from grape berry skins.
• This optimized method provides a reliable tool for advancing grapevine research, particularly for high-throughput sequencing applications.
• The improved RNA extraction facilitates accurate gene expression studies in Vitis Vinifera.