JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Uncomplicated oocyte donation pregnancies are associated with a higher incidence of human leukocyte antigen alloantibodies.

BACKGROUND: Fetuses in pregnancies conceived after oocyte donation (OD) have a higher degree of antigeneic dissimilarity with the mother compared to semi-allogeneic fetuses after natural conception. We questioned whether this leads to higher level of HLA antibody formation in OD pregnancies.

METHOD: Uncomplicated pregnancies after OD were compared with pregnancies conceived either spontaneously or by IVF. We calculated the number of HLA- and epitope mismatches. Maternal sera were screened for HLA antibodies with ELISA; child HLA specific antibody production was determined using CDC and Luminex with single antigen beads for class I and II.

RESULTS: A significantly (p<0.0001) higher incidence of HLA antibody production was observed in women conceiving after OD (69%) compared to non-donor pregnancies (24-25%). The antibody formation was positively correlated with the number of fetomaternal antigen (Spearman's rho 0.95, p<0.0001) and epitope mismatches (Spearman's rho 0.91, p<0.0001). The number of HLA-DR mismatches between women and child was an independent risk factor for the production of HLA class I specific alloantibodies.

CONCLUSION: Women conceiving after OD have a higher risk of developing child-specific HLA antibodies; the higher the number of immunogenetic differences, the higher the chance these antibodies are formed. The high incidence of antibody production also strongly depends upon the number of HLA-DR mismatches. Despite the stronger antibody response, OD was associated with uncomplicated pregnancy in cases included in this study.

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