NR2F2 is required in the embryonic testis for fetal Leydig cell development

Area of Science:

• Reproductive Biology
• Developmental Biology
• Endocrinology

Background:

• Male genital development relies on fetal Leydig cells (FLCs) synthesizing testosterone.
• Disruptions in this process lead to differences in sex development (DSD).
• The genetic regulation of FLC differentiation remains largely unknown.

Purpose of the Study:

• To investigate the role of the orphan nuclear receptor NR2F2 (COUP-TFII) in fetal Leydig cell development.
• To understand NR2F2's function in the genetic cascade controlling FLC differentiation.

Main Methods:

• Utilized mouse models with conditional mutations in *Nr2f2* within developing testes.
• Analyzed NR2F2 expression patterns in interstitial progenitor cells and differentiating FLCs.
• Examined effects on testis morphogenesis and FLC development.

Main Results:

• NR2F2 is expressed in progenitor cells and downregulated during FLC differentiation.
• Conditional *Nr2f2* mutation impaired testis morphogenesis and FLC development.
• NR2F2 regulates the initiation and progression of FLC differentiation.

Conclusions:

• NR2F2 is an essential regulator of FLC development and steroidogenesis in the fetal testis.
• NR2F2's role provides insights into the etiology of 46,XY DSD linked to NR2F2 variants.