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TaqI HLA-B and -DRB RFLP analysis can predict disease in siblings of affected children with 21-hydroxylase deficiency

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Summary

The possibility of using TaqI restriction fragment length polymorphism (RFLP) analysis of the HLA-B locus and the HLA-DR-DQ subregions, flanking the 21-hydroxylase genes, for predicting disease in siblings of children with 21-hydroxylase deficiency was analyzed in 12 nuclear families with at least one affected child and a total of 18 at-risk off-spring. As part of the study allelic TaqI HLA-B RFLP patterns were determined in homozygous cell lines and families. The frequencies of individuals homozygous for TaqI allelic patterns of the different investigated HLA loci, each locus alone and in various combinations, were determined in 100 random controls. In all 12 families it was possible to make correct genetic diagnosis by the use of only one restriction enzyme, TaqI, and two locus-specific HLA cDNA probes, HLA-B and -DRB. In all families four haplotypes were obtained. Thus, affected siblings as well as carriers could be identified. Seven of the eight sibling pairs concordant for 21-hydroxylase deficiency had pairwise identical TaqI HLA-B-DRB-DQA-DQB haplotypes. The last disease-concordant sibling pair had inherited different haplotypes from their mother, who had nonclassical 21-hydroxylase deficiency. None of the ten healthy children shared both haplotypes with their affected sibling(s). Early prenatal suppression of the fetal adrenal cortex with fluorinated corticosteroids can prevent virilization of female fetuses with 21-hydroxylase deficiency. In most cases RFLP analysis of the 21-hydroxylase genes is not informative enough for prenatal diagnosis. Our results from the present retrospective family study indicate that TaqI HLA-B and -DRB RFP analysis will be a valuable tool for first trimester assessment of 21-hydroxylase deficiency. TagI HLA-B and -DRB RFLP analysis can be performed on DNA from chorionic villi biopsies obtained in the 8th week of pregnancy. Supplemented with sex determination, early withdrawal of prophylactic steroid therapy will thus be feasible when the mother carries a male or an unaffected female fetus.

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Olerup, O., Luthman, H., Martin Ritzén, E. et al. TaqI HLA-B and -DRB RFLP analysis can predict disease in siblings of affected children with 21-hydroxylase deficiency. Hum Genet 85, 467–472 (1990). https://doi.org/10.1007/BF00194218

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  • DOI: https://doi.org/10.1007/BF00194218

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