Sperm DNA methylation profiling in patients with Kallmann syndrome

Area of Science:

• Epigenetics
• Reproductive Biology
• Genetics

Background:

• Kallmann syndrome (KS) is a genetic disorder characterized by hypogonadotropic hypogonadism and impaired sense of smell.
• Epigenetic modifications, such as DNA methylation, are increasingly recognized as crucial in regulating gene expression and reproductive health.

Purpose of the Study:

• To comprehensively characterize the DNA methylation profile in sperm from patients with Kallmann syndrome (KS).
• To investigate potential epigenetic mechanisms contributing to KS pathogenesis and associated spermatogenic abnormalities.

Main Methods:

• DNA methylation patterns were analyzed in sperm samples from KS patients and healthy controls (HCs).
• Differentially methylated regions (DMRs) were identified, and associated genes underwent enrichment analysis.
• Spermatogenesis-related genes were screened, and correlations with semen parameters were evaluated.

Main Results:

• Sperm from KS patients exhibited significantly higher DNA methylation compared to HCs.
• 4,749 DMRs were identified, affecting genes involved in neuronal function, migration, and GnRH secretion.
• Key KS-related genes (e.g., CHD7, DCC) and core spermatogenesis genes (e.g., BRCA1) showed significant methylation changes and correlations with semen parameters.

Conclusions:

• DNA methylation alterations in KS sperm reflect epigenetic consequences of congenital gonadotropin deficiency and treatment.
• These epigenetic changes are associated with persistent spermatogenic abnormalities in KS patients.
• The findings provide a basis for exploring epigenetic biomarkers and therapeutic interventions for KS-related infertility.