Mol. Hum. Reprod. Advance Access originally published online on August 20, 2004
Molecular Human Reproduction 2004 10(10):767-772; doi:10.1093/molehr/gah101
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Isothermal whole genome amplification from single and small numbers of cells: a new era for preimplantation genetic diagnosis of inherited disease
1Leeds PGD Centre, Assisted Conception Unit, Clarendon Wing, Leeds General Infirmary, Leeds, 2The London Bridge Fertility, Gynaecology and Genetics Centre, London and 3School of Biology, University of Leeds, Leeds, UK
4 To whom correspondence should be addressed at: The London Bridge Fertility, Gynaecology and Genetics Centre, 1 St Thomas Street, London Bridge, London SE1 9RY, UK and School of Biology, University of Leeds, Leeds LS2 9JT, UK. Email: a.h.handyside{at}leeds.ac.uk
Preimplantation genetic diagnosis (PGD) of single gene defects following assisted conception typically involves removal of single cells from preimplantation embryos and analysis using highly sensitive PCR amplification methods taking stringent precautions to prevent contamination from foreign or previously amplified DNA. Recently, whole genome amplification has been achieved from small quantities of genomic DNA by isothermal amplification with bacteriophage
29 DNA polymerase- and exonuclease-resistant random hexamer primers. Here we report that isothermal whole genome amplification from single and small numbers of lymphocytes and blastomeres isolated from cleavage stage embryos yielded microgram quantities of amplified DNA, and allowed analysis of 20 different loci, including the
F508 deletion causing cystic fibrosis and polymorphic repeat sequences used in DNA fingerprinting. As with analysis by PCR-based methods, some preferential amplification or allele drop-out at heterozygous loci was detected with single cells. With 25 cells, amplification was more consistent and with 10 or 20 cells results were indistinguishable from genomic DNA. The use of isothermal whole genome amplification as a universal first step marks a new era for PGD since, unlike previous PCR-based methods, sufficient DNA is amplified for diagnosis of any known single gene defect by standard methods and conditions.
Key words: preimplantation genetic diagnosis/single gene defects/whole genome amplification
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