Optimized total RNA isolation from bovine sperm with enhanced sperm head lysis

Area of Science:

• Reproductive Biology
• Molecular Biology
• Genomics

Background:

• Sperm RNA plays a vital role in fertilization and embryonic development.
• Isolating RNA from sperm is challenging due to highly condensed DNA.
• Existing bovine sperm RNA isolation protocols lack standardization, leading to variability.

Purpose of the Study:

• To optimize a method for total RNA isolation from bovine sperm.
• To investigate the impact of different lysis conditions on RNA yield and integrity.
• To reduce experimental variability in bovine sperm transcriptome studies.

Main Methods:

• Sperm were lysed using TRIzol reagent with mechanical (sonication, needle passage) and chemical (DTT, TCEP) treatments.
• Microscopic evaluation assessed sperm head and tail lysis efficiency.
• RNA integrity was confirmed using electrophoresis and RT-qPCR to detect contaminants.

Main Results:

• TCEP supplementation in TRIzol, combined with mechanical treatments, achieved progressive sperm head lysis.
• This optimized method consistently yielded total sperm RNA.
• RT-qPCR confirmed the absence of genomic DNA and somatic cell contamination.

Conclusions:

• Effective lysis of the sperm head, particularly using TCEP with mechanical treatment, is critical for successful total RNA isolation.
• The presented method offers a standardized approach for bovine sperm RNA isolation.
• This optimization minimizes experimental variability in downstream transcriptome analyses.