Molecular genotyping of fetal platelet antigens with uncultured amniocytes

Adib N. Khouzami, Thomas S. Kickler, Paul F. Bray, Nancy A. Callan, Anthony C. Sciscione, Joseph B. Shumway, Karin J. Blakemore

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVE: Amino acid substitutions in platelet membrane glycoproteins result in alloantigens implicated in neonatal alloimmune thromboctyopenia. We report the use of the reverse dot blot technique to genotype the five major fetal platelet alloantigens from amniotic fluid cells. STUDY DESIGN: We evaluated a patient with Bakb platelet antibodies who had a previous pregnancy complicated by fetal intracranial hemorrhage. The father was heterozygous Baka/Bakb, giving the pregnancy a 50% risk for platelet incompatibility between mother and fetus. Amniotic fluid was obtained at 16 weeks. Deoxyribonucleic acid was extracted from uncultured amniocytes and amplified with polymerase chain reaction. These products were hybridized to filters containing oligonucleotides specific for each of the 10 different platelet antigen alleles. Reactivity was detected with a chromogenic substrate. RESULTS: The reverse dot blot genotyping of uncultured amniocytes revealed the fetus to be Baka/Baka, thus not at risk for neonatal alloimmune thrombocytopenia. CONCLUSION: Precise knowledge of fetal platelet type of amniocentesis could obviate the need for fetal blood sampling and significantly alter prenatal management of neonatal alloimmune thrombocytopenia.

Original languageEnglish (US)
Pages (from-to)1202-1206
Number of pages5
JournalAmerican journal of obstetrics and gynecology
Volume173
Issue number4
DOIs
StatePublished - Oct 1995

Keywords

  • Neonatal alloimmune thrombocytopenia
  • polymerase chain reaction
  • prenatal diagnosis
  • reverse dot blot

ASJC Scopus subject areas

  • Obstetrics and Gynecology

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