Exploring Single-Nucleotide Polymorphisms in Primary and Secondary Male Infertility

Area of Science:

• Genetics
• Reproductive Medicine
• Mitochondrial Biology

Background:

• Male infertility affects approximately 50% of infertility cases globally.
• Primary and secondary male infertility have poorly understood genetic underpinnings.
• Mitochondrial genes play a crucial role in cellular energy production and sperm function.

Purpose of the Study:

• To investigate the association between single-nucleotide polymorphisms (SNPs) in mitochondrial genes (MT-ND3, MT-ND4L, MT-ND4) and male infertility.
• To differentiate the genetic contributions to primary versus secondary male infertility.
• To explore potential genetic biomarkers for male infertility risk.

Main Methods:

• Sanger sequencing was used to analyze genotype distributions of SNPs in 68 infertile males.
• The study included 49 males with primary infertility and 19 with secondary infertility.
• Statistical analysis was performed to identify significant correlations between SNPs and infertility types.

Main Results:

• Specific SNPs in the MT-ND4 and MT-ND4L genes showed significant associations with primary male infertility.
• SNP rs2857285 in the ND4 gene and rs28358279 in the ND4L gene were prominently linked to the TT genotype in primary infertility cases.
• A borderline correlation was observed for SNP rs869096886 in the ND4 gene with reproductive duration.

Conclusions:

• Mitochondrial gene variations, specifically studied SNPs, may contribute to male infertility by affecting sperm survival and function.
• These mitochondrial SNPs could serve as potential biomarkers for assessing male infertility risk.
• Further research with larger cohorts and functional studies is recommended to validate these findings and explore combined genetic and environmental factors.