Profiling Histone Modifications in Differentiating Mouse Spermatogonia with CUT&Tag

Area of Science:

• Epigenetics
• Spermatogenesis
• Mammalian reproduction

Background:

• Paternal histone modifications are vital for fertility and offspring development.
• Current methods like ChIP-seq are limited for analyzing early spermatogenic cells (spermatogonia) due to low cell yields.
• Understanding spermatogonial epigenetics is crucial for male reproductive health.

Purpose of the Study:

• To develop a robust protocol for profiling histone modifications in spermatogonia.
• To overcome the limitations of ChIP-seq for analyzing low cell numbers in early spermatogenesis.
• To enable detailed investigation of the epigenome in premeiotic male germ cells.

Main Methods:

• Combined fluorescence-activated cell sorting (FACS) with an optimized Cleavage Under Targets and Tagmentation (CUT&Tag) workflow.
• Utilized as few as 50,000 dissociated, sorted cells.
• Generated genome-wide histone modification enrichment data.

Main Results:

• Achieved high-quality, reproducible CUT&Tag datasets from limited cell populations.
• Successfully captured histone modification enrichment in differentiating spermatogonia.
• Demonstrated the protocol's efficacy for analyzing the epigenetics of premeiotic germ cells.

Conclusions:

• The developed FACS-optimized CUT&Tag protocol effectively profiles histone modifications in spermatogonia.
• This method overcomes previous limitations, facilitating robust epigenetic studies in early male germ cells.
• Enables easier and more reliable investigation of male germ line epigenetics.