Novel UBE2B-associated polymorphisms in an azoospermic/oligozoospermic population

Area of Science:

• Genetics
• Molecular Biology
• Reproductive Medicine

Background:

• The UBE2B gene plays a role in cellular processes, and its abnormalities may be linked to male infertility.
• Investigating genetic factors is crucial for understanding the causes of infertility.

Purpose of the Study:

• To identify potential abnormalities in the UBE2B gene in infertile males.
• To determine the biological significance of any discovered UBE2B gene variations.

Main Methods:

• Conducted PCR amplification and sequence analysis of the UBE2B gene in fertile and infertile men.
• Utilized DNA-protein gel shift assays to evaluate transcription factor binding affinity to identified polymorphisms.

Main Results:

• A novel single nucleotide polymorphism (SNP) was found in exon 4 of the UBE2B gene in 5% of infertile men.
• Increased binding affinity for SP1 was observed with CGG deletions in the promoter region.
• Seven novel intronic SNPs were identified in the infertile group.

Conclusions:

• While single or double CGG deletions alone may not be biologically significant, they are associated with increased SP1 binding.
• These promoter region deletions might be one factor contributing to altered UBE2B gene expression and male infertility.