RAD21L1 Is Sufficient and Effective for Reprogramming Human Sertoli Cells to Phenotypic Spermatogonial Stem Cells...

Area of Science:

• Reproductive Biology
• Stem Cell Biology
• Molecular Genetics

Background:

• The molecular mechanisms of somatic cell reprogramming into male germ cells are not fully understood.
• Sertoli cells are somatic cells crucial for male germ cell development.

Purpose of the Study:

• To investigate the role of RAD21L1 in reprogramming Sertoli cells into human spermatogonial stem cells (SSCs).
• To elucidate the molecular mechanisms involved in this reprogramming process.
• To explore the link between RAD21L1 mutations and male infertility.

Main Methods:

• Overexpression of DAZ family genes to upregulate RAD21L1.
• RNA sequencing to analyze gene expression changes (e.g., DNMT1).
• Whole genome bisulfite sequencing to assess DNA methylation.
• Analysis of RAD21L1 mutations in patients with non-obstructive azoospermia (NOA).

Main Results:

• RAD21L1 overexpression effectively reprograms Sertoli cells into phenotypic and functional human SSCs with high safety.
• RAD21L1 modulates DNA methylation and interacts with DNMT1 during reprogramming.
• RAD21L1 mutations decrease SSC stemness and DNMT1 expression.
• RAD21L1 mutations are positively correlated with NOA and male infertility.

Conclusions:

• RAD21L1 is sufficient and effective for reprogramming human Sertoli cells into SSCs by modulating DNMT1.
• RAD21L1 mutations are implicated in the pathogenesis of NOA and male infertility.
• This study provides a novel mechanism for human somatic cell reprogramming into SSCs, offering potential for treating male infertility.