Human Reproduction, Vol. 14, No. 5, 1213-1216,
May 1999
© 1999 European Society of Human Reproduction and Embryology
International, collaborative assessment of 146 000 prenatal karyotypes: expected limitations if only chromosome-specific probes and fluorescent in-situ hybridization are used
1 Departments of Obstetrics and Gynecology, Molecular Medicine and Genetics, and Pathology, Hutzel Hospital/Wayne State University, 4707 St Antoine Blvd, Detroit, MI 48201, USA, 2 Reproductive Genetics Center, Denver, CO, 3 Prenatal Diagnostic Center, Lexington, MA, USA, 4 Karolinska Institute, Stockholm, Sweden, 5 Kings College, London, UK, 6 Jefferson Medical Center, Philadelphia, PA, USA, 7 Departments of Medical Genetics and Ob/Gyn, University of Basel, Basel, Switzerland and 8 Quest-Nichols Institute, San Juan Capistrano, CA, USA
The development of chromosome-specific probes (CSP) and fluorescent in-situ hybridization (FISH) has allowed for very rapid identification of selected numerical abnormalities. We attempt here to determine, in principle, what percentage of abnormalities would be detectable if only CSPFISH were performed without karyotype for prenatal diagnosis. A total of 146 128 consecutive karyotypes for prenatal diagnosis from eight centres in four countries for 5 years were compared with predicted detection if probes for chromosomes 13, 18, 21, X and Y were used, and assuming 100% detection efficiency. A total of 4163 abnormalities (2.85%) were found including 2889 (69.4%) (trisomy 21, trisomy 18, trisomy 13, numerical sex chromosome abnormalities, and triploidies) which were considered detectable by FISH. Of these, 1274 were mosaics, translocations, deletions, inversions, rings, and markers which would not be considered detectable. CSPFISH is a useful adjunct to karyotype for high risk situations, and may be appropriate in low risk screening, but should not be seen as a replacement for karyotype as too many structural chromosome abnormalities will be missed.
Key words: cytogenetics/FISH/karyotype/molecular cytogenetics/prenatal diagnosis
9 To whom correspondence should be addressed
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