A rapid and efficient SDS-based RNA isolation protocol from different tissues of coffee

Area of Science:

• Plant Molecular Biology
• Biotechnology

Background:

• RNA isolation from coffee plants is difficult due to high levels of interfering compounds like polysaccharides and polyphenols.
• Existing methods often yield low-quality or insufficient RNA for downstream applications.

Purpose of the Study:

• To develop and optimize a rapid, efficient protocol for isolating high-quality RNA from various coffee tissues.
• To ensure the isolated RNA is suitable for functional genomics research.

Main Methods:

• Optimized RNA extraction protocol involving PVPP addition, a 65°C incubation step, and potassium acetate purification.
• RNA quality and quantity assessed via agarose gel electrophoresis, spectrophotometry (A260/280 and A260/230 ratios), and PCR amplification.
• DNA contamination checked by PCR amplification using cDNA and genomic DNA.

Main Results:

• The optimized protocol yielded high RNA quantity (225.6–454.8 µg/g) and quality.
• Agarose gel showed intact 28S and 18S rRNA bands.
• Spectrophotometric values (A260/280: 1.96–2.02, A260/230: 1.95–2.14) indicated minimal contamination.
• PCR confirmed the absence of DNA contamination and suitability for downstream applications.

Conclusions:

• The developed protocol is rapid and efficient for isolating high-quality RNA from coffee.
• The protocol effectively removes inhibitory compounds, yielding RNA suitable for functional genomics.
• This method provides a reliable tool for coffee molecular biology research.