Impact of soft tissue homogenization methods on RNA quality

Area of Science:

• Molecular Biology
• Genomics
• Biotechnology

Background:

• High-quality RNA isolation is essential for accurate transcriptomic analysis.
• Tissue disruption methods significantly impact RNA yield and integrity.
• Evaluating homogenization techniques is critical for optimizing RNA extraction protocols.

Purpose of the Study:

• To compare the efficacy of three tissue homogenization methods: mortar and pestle, ball mill, and tissue homogenizer.
• To assess the impact of homogenization on RNA quality and quantity from diverse human tissues.
• To determine the optimal method for RNA isolation in transcriptomic studies.

Main Methods:

• Head and neck cancerous tissues, healthy head and neck tissues, and breast skin were processed using three homogenization techniques.
• RNA quantity and quality were evaluated by measuring concentration, absorbance, RNA Integrity Number (RIN), and Ct values of reference genes.
• Statistical analysis was performed to compare the results between different homogenization methods.

Main Results:

• The tissue homogenizer method resulted in significantly higher 260/230 ratios (p=0.02) and RNA concentrations (p=0.02).
• RIN values tended to be highest when using the tissue homogenizer across all tested tissue types.
• No significant differences in Ct values were observed between methods, but GAPDH and S18 Ct values correlated negatively with RIN (p=0.002, p=0.003).

Conclusions:

• The tissue homogenizer is the most effective method for obtaining high-quality RNA from various human tissues.
• High RNA quality, indicated by RIN values, is crucial for reliable RNA-based analyses.
• GAPDH and S18 Ct values can serve as indicators of RNA quality, complementing RIN measurements.