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Increased frequency of complement C4 'null' alleles in recurrent spontaneous abortions
T Laitinen1, M L Lokki, M Tulppala
1Tissue Typing Laboratory, Finnish Red Cross Blood Transfusion Service, Helsinki.
Human Reproduction (Oxford, England)
|November 1, 1991
Summary
Recurrent spontaneous abortion (RSA) is linked to increased sharing of HLA antigens and a higher prevalence of complement C4 null alleles in affected couples. This genetic predisposition may increase offspring
Area of Science:
- Immunogenetics
- Reproductive Immunology
Background:
- Recurrent spontaneous abortion (RSA) affects couples, with potential genetic links.
- Major histocompatibility complex (MHC) and complement system genes are implicated.
Purpose of the Study:
- To investigate HLA and complement C4 allele sharing in Finnish couples with recurrent spontaneous abortions (RSA).
- To identify genetic factors contributing to recurrent spontaneous abortions.
Main Methods:
- Typing for HLA A, B, C, DR antigens and complement C4A, C4B, factor B in 59 Finnish RSA couples.
- Comparison of allele frequencies between primary (PA) and secondary (SA) abortion couples and controls.
Main Results:
- Increased HLA A and B locus sharing observed in RSA couples.
- Significantly higher prevalence of complement C4A and C4B null alleles found in RSA couples (both PA and SA).
- RSA couples showed a higher frequency of carrying at least one C4 null allele compared to controls.
Conclusions:
- Elevated C4 null alleles are associated with recurrent spontaneous abortions.
- Offspring of RSA couples face an increased risk of inheriting C4 null alleles.
- Genetic factors, including HLA and complement C4, play a role in recurrent spontaneous abortions.