Sox3 functions in a cell-autonomous manner to regulate spermatogonial differentiation in mice

Area of Science:

• Developmental Biology
• Genetics
• Reproductive Biology

Background:

• The X-linked Sox3 gene is a transcription factor involved in various developmental processes.
• Sox3's specific role in spermatogenesis, the process of sperm formation, requires further investigation.

Purpose of the Study:

• To elucidate the intrinsic role of Sox3 in spermatogenesis.
• To investigate the impact of Sox3 deletion on germ cell development and differentiation.

Main Methods:

• Utilized Sox3 knockout mouse models (ubiquitous and germ cell-specific via VasaCre).
• Performed histological analyses and RNA expression profiling at various postpartum days (dpp).
• Employed fluorescent-activated cell sorting (FACS) to quantify spermatogonia populations.

Main Results:

• Sox3 deficiency led to germ cell depletion by 20 dpp, primarily affecting differentiated spermatogonia.
• Spermatogenesis eventually resumed, with postmeiotic germ cells appearing by 56 dpp.
• Germ cell-specific Sox3 deletion phenocopied ubiquitous knockout, confirming an intrinsic role in germ cells.

Conclusions:

• Sox3 intrinsically promotes spermatogonia differentiation in prepubertal mice.
• Sox3 is not required for maintaining spermatogenesis in adult mice.
• Sox3 knockout mice serve as a valuable model for studying prepubertal germ cell differentiation mechanisms.