Temporal changes in histomorphology and gene expression in goat testes during postnatal development.

Area of Science:

• Reproductive Biology
• Developmental Biology
• Animal Science

Background:

• Testicular cell proliferation and differentiation are crucial for male reproductive maturity.
• Understanding these processes in livestock models aids in reproductive health research.

Purpose of the Study:

• To evaluate the histoarchitecture, gene expression, and testosterone production during the development of goat testes.
• To identify key developmental milestones and molecular markers in maturing goat testes.

Main Methods:

• Testes were collected from Alpine bucks at 0, 2, 4, 6, and 8 months of age.
• Histological analysis assessed testicular weight, seminiferous tubule diameter, lumen diameter, and epithelial height.
• Quantitative real-time PCR (qRT-PCR) was used to measure the expression of specific genes related to germ cell function, steroidogenesis, and hormonal regulation.
• Testosterone content was measured per gram of testicular tissue and per testis.

Main Results:

• Significant increases in testicular weight, seminiferous tubule dimensions, and epithelial height were observed between 2 and 4 months of age.
• Expression of haploid germ cell markers (PRM1, ODF2, STRA8) dramatically increased at 4 months.
• Expression of genes like CYP11A1, SOX9, IGF1R, and HSPA8 decreased during maturation.
• Glutathione S-Transferase A3 (GSTA3) showed a unique peak at 2 months.
• Testosterone content per testis tended to increase by 6 months.

Conclusions:

• Major shifts in goat testicular cellular structure and gene expression occur around 4 months of age, marking the onset of spermatogenesis.
• Male goats exhibit rapid maturation, establishing them as a suitable model for investigating factors influencing testicular development and function.