Abstract
The prenatal diagnosis of severe combined immunodeficiency (SCID) was made in three fetuses by staining fetal blood obtained at fetoscopy with a panel of monoclonal antibodies. There were less than 100 T cells/mm3 of fetal blood in these three cases compared to 2,500/mm3 in 14 immunologically normal fetuses. Cells bearing the cortical thymocyte antigen (NA1/34) were not detected in any of the normal or affected fetal blood samples. Two of the affected fetuses were also homozygous for a deficiency of adenosine deaminase (ADA) with undetectable levels of red cell ADA. All three affected fetuses were aborted and postmortem tissue was obtained in two cases. In both of these cases the thymus was markedly hypoplastic and contained no lymphoid cells. One of these fetuses was homozygous for ADA deficiency and the virtual absence of T cells or thymocytes during the second trimester of pregnancy indicates that placental access to the maternal circulation does not prevent damage to the T lineage stem cells in this disease. Prenatal diagnosis of SCID has previously only been possible in patients with a defined metabolic defect such as ADA deficiency, but these studies indicate that prenatal diagnosis now may be offered for most at risk pregnancies.
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