Desmoplakin (Dsp) conditional knockout in NR5A1+ somatic cells affects germ cell survival in developing mouse gonads

Area of Science:

• Developmental Biology
• Cell Biology
• Reproductive Biology

Background:

• Cell-to-cell interactions are vital for tissue development.
• Desmoplakin, a desmosome component, links cell adhesion to the cytoskeleton.
• The function of desmoplakin in gonad development is not well understood.

Purpose of the Study:

• To investigate the role of desmoplakin in gonad development.
• To determine if desmoplakin is essential for germ cell survival and gonad structure.

Main Methods:

• Utilized a tissue-specific knockout of the desmoplakin (Dsp) gene in NR5A1+ somatic cells of fetal gonads.
• Analyzed the effects of Dsp gene deletion on germ cell number, somatic cell types, and overall gonad structure.
• Examined the expression of key sex determination and differentiation genes.

Main Results:

• Desmoplakin is crucial for germ cell survival in both fetal testes and ovaries.
• Dsp knockout in testes reduced germ cell numbers and testis size but spared Sertoli cells and testis structure.
• Dsp knockout in ovaries decreased germ cell numbers and severely impaired ovarian follicle formation.
• Sex determination and differentiation remained unaffected by the Dsp knockout.

Conclusions:

• Desmoplakin-mediated cell adhesion is necessary for maintaining germ cell survival during gonad development.
• Targeting desmoplakin in NR5A1+ somatic cells provides insights into gonad formation mechanisms.
• Desmoplakin plays a critical, non-redundant role in supporting germline integrity within the developing gonad.