Single cell RNA-sequencing identified Dec2 as a suppressive factor for spermatogonial differentiation by inhibiting...

Area of Science:

• Reproductive Biology
• Developmental Biology
• Genetics

Background:

• The transition of gonocytes to spermatogonia is essential for initiating sperm production.
• The molecular mechanisms governing this critical germ cell fate determination are not fully understood.
• Asynchronous differentiation of neonatal germ cells complicates studying this process.

Purpose of the Study:

• To elucidate the temporal gene expression dynamics during the gonocyte-to-spermatogonia transition.
• To identify key molecular regulators involved in maintaining spermatogonial stem cells (SSCs).

Main Methods:

• Single-cell RNA sequencing (scRNA-seq) analysis of neonatal mouse germ cells (P1.5-5.5).
• Identification of transcriptional modules and key regulatory factors.
• Functional assessment using Dec2-deficient mice and cell transplantation assays.

Main Results:

• scRNA-seq identified distinct transcriptional modules governing neonatal spermatogonial networks.
• Dec2, a bHLH transcription factor, was identified as a repressor of the spermatogonial differentiation factor Sohlh1.
• Dec2 deficiency led to reduced undifferentiated spermatogonia and impaired SSC engraftment efficiency.

Conclusions:

• Dec2 plays a critical intrinsic role in maintaining spermatogonial stem cells (SSCs).
• Dec2 protects germ cells from premature or inadequate differentiation during neonatal testis development.
• This study reveals Dec2 as a novel SSC factor essential for fertility.