IDENTIFICATION OF ABNORMAL CHROMOSOMAL COMPLEMENT IN FORMALIN-FIXED, PARAFFIN-EMBEDDED PLACENTAL TISSUE

The objective of this project was to assess the efficacy of fluorescen ce in situ hybridization (FISH) with chromosome-specific DNA probes to identify chromosome number in formalin-fixed, paraffin-embedded place ntal specimens. Using this approach, 75 per cent of the karyotypes in 20 formalin-fixed placental samples (comprising aneuploids, triploids, and normals) were correctly identified. As this technology improves, the ability to obtain information regarding chromosomal abnormalities in formalin-fixed, paraffin-embedded placental tissue should improve a s well. This technology can potentially provide important cytogenetic information even when fresh tissue is not available for standard karyo typic analysis.