Association between major histocompatibility antigen and reproductive performance.

Area of Science:

• Immunogenetics
• Reproductive Medicine
• Human Leukocyte Antigen (HLA) System

Background:

• Conflicting research exists regarding the association between human leukocyte antigen (HLA) antigens and reproductive outcomes.
• Previous studies have yielded inconsistent results on the role of HLA in recurrent spontaneous abortions and unexplained infertility.
• A need exists to clarify the relationship between HLA and reproductive performance by addressing methodological variations in patient classification.

Purpose of the Study:

• To investigate the association between human leukocyte antigen (HLA) antigen disparities and reproductive performance.
• To clarify discrepant findings by comparing HLA antigens in couples with recurrent spontaneous abortions and unexplained infertility against fertile controls.
• To analyze antigenic disparity, homozygosity, and heterozygote offspring probability across different reproductive outcome groups.

Main Methods:

• Comparison of HLA antigens from 59 couples with recurrent spontaneous abortions (primary/secondary) and 79 couples with unexplained infertility (primary/secondary) against 51 fertile couples.
• Classification of patients into primary (no children) or secondary (post-childbirth abortions/stillbirths) aborters, and primary (never pregnant) or secondary (previously pregnant) infertiles.
• Analysis of antigenic disparity, homozygosity at specific HLA loci (DR, DQ, B), and probability of producing heterozygotic offspring.

Main Results:

• Significantly higher disparities at combined HLA and DR loci were observed between fertile controls and primary aborters.
• Significant disparity at the DQ locus was found between controls and secondary aborters.
• Increased homozygosity at DR and DQ loci was noted in primary aborters, while secondary infertile couples showed increased homozygosity at the B locus. A significant association in heterozygote production probability at the DQ locus was seen in primary infertile patients.

Conclusions:

• The observed discrepancies in HLA-reproductive performance associations can be attributed to the precise classification of recurrent spontaneous aborters and unexplained infertiles.
• Specific HLA loci (DR, DQ, B) show differential associations with primary and secondary recurrent spontaneous abortions and unexplained infertility.
• This study provides a framework for understanding the complex interplay between HLA and human reproductive success.