Human Reproduction, Vol. 16, No. 1, 43-50,
January 2001
© 2001 European Society of Human Reproduction and Embryology
Controlling misdiagnosis errors in preimplantation genetic diagnosis: a comprehensive model encompassing extrinsic and intrinsic sources of error
1 Division of Medical and Molecular Genetics, Guy's, King's and St Thomas' School of Medicine, London SE1 9RT, 2 ARC Epidemiology Research Unit, University of Manchester, Manchester M13 9PT, 3 Department of Applied Statistics, University of Reading, Reading RG6 2FN and 4 School of Biology, University of Leeds, Leeds LS2 9JT, UK
We have developed a mathematical model to explore accuracy of preimplantation genetic diagnosis (PGD) using single cell polymerase chain reaction (PCR). The model encompasses both extrinsic technical errors and intrinsic errors related to nuclear and chromosomal abnormalities. Using estimates for these errors, we have calculated the probability of a serious error (affected embryo diagnosed as unaffected) using a variety of strategies designed to increase the accuracy of PGD. Additional information from genotyping a linked marker or a second biopsied cell reduces the probability of replacing an affected embryo, while ensuring that sufficient unaffected embryos can be replaced. For a recessive disease, two genotypes are required to ensure a low probability of replacing an affected embryo (<1%) with a high proportion of unaffected embryos eligible for replacement (68%). These genotypes may be from a single cell with linked marker, or disease genotypes from two cells. PGD of a dominant disease is more difficult, as it relies on the amplification of a single copy of the mutation. Genotypes from two biopsied cells are required to ensure that a high proportion of unaffected embryos are eligible for replacement. This model can be used as a clinical tool to prioritize embryos for transfer in a PGD cycle.
Key words: genetics/mathematical modelling/misdiagnosis/preimplantation genetic diagnosis
5 To whom correspondence should be addressed at: School of Biology, University of Leeds, Leeds LS2 9JT, UK. E-mail: a.h.handyside{at}leeds.ac.uk
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