Rapid prenatal diagnosis of aneuploidies and zygosity in multiple pregnancies by amniocentesis with single insertion of the needle and Quantitative Fluorescent PCR

Vincenzo Cirigliano, Paz Cañadas, Alberto Plaja, Elena Ordoñez, Carmen Mediano, Angeles Sánchez, Inma Farrán

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

Objective. To investigate amniotic fluid (AF) samples retrieved in multiple pregnancies by single insertion of the needle, for rapid assessment of chromosome copy number, zygosity, and cross-contamination between fetuses, using Quantitative Fluorescent Polymerase Chain Reaction (QF-PCR) amplification of highly polymorphic microsatellite markers. Methods. Fifty-two multiple pregnancies were selected (47 twins, 5 triplets) and 108 samples of amniotic fluid were sampled between 12 to 20 weeks of gestation (mean 15.5) using the single-needle technique. Aneuploidy screening by QF-PCR amplification of short tandem repeats (STRs) on chromosomes X, Y, 21, 13, and 18 was carried out within 24 h of collection. Owing to the sampling procedure, the eventual presence of contamination between fetuses was also evaluated in every case. Results. Normal and aneuploid fetuses were readily identified by QF-PCR. Fetal reduction was made available, for trisomic fetuses, without further waiting for completion of fetal karyotyping. In twin gestations, the ultrasound examination of chorionicity was always in agreement with the molecular assessment of zygosity. Contamination between fetuses due to the sampling procedure with a single puncture was never observed. Conclusion. Rapid prenatal diagnosis of aneuploidies by QF-PCR is a sensitive, efficient, and reliable assay. When applied in multiple pregnancies, it has the added value of allowing the assessment of zygosity in all, cases, independently of chorionicity and fetal sex. Copyright © 2003 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)629-633
JournalPrenatal Diagnosis
Volume23
Issue number8
DOIs
Publication statusPublished - 1 Aug 2003

Keywords

  • Aneuploidy
  • Multiple pregnancies
  • Prenatal diagnosis
  • QF-PCR
  • STR

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