Abstract
Purpose: We evaluated methods of preparation of DNA from single cells for amplification and preimplantation genetic diagnosis (PGD), including our “spanning protocol.”
Methods: Dystrophin gene exons 45 and 51 were amplified by nested polymerase chain reaction (PCR) from a single lymphocyte or blastomere. Amplification efficiencies were compared between DNA extraction by (A) lysis in distilled water with freeze-thawing and boiling; (B) two-step lysis involving potassium hydroxide and dithiothreitol; and (C) the spanning protocol, using N-lauroylsarcosine.
Results: With method A, amplification efficiency was 66/120 (55%) and false-positive such as amplification failure or allele drop out was 42/120 (35%); with B, 96/120 (80%) and 21/120 (17.5%); and with C, 111/120 (92%) and 5/120 (4.2%), using single blastomeres and unaffected lymphocytes from male. Occurrence of false-negative such as contamination of another DNA with method A was 4/120 (3.3%); with B, 10/120 (8.3%); and with C, 2/120 (1.7%) from using single lymphocytes from affected males.
Conclusion: The spanning protocol was most efficient for extracting DNA from a single cell and should be particularly useful for preimplantation genetic diagnosis.
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Tsuchiya, S., Sueoka, K., Matsuda, N. et al. The “Spanning Protocol”: A new DNA extraction method for efficient single-cell genetic diagnosis. J Assist Reprod Genet 22, 407–414 (2005). https://doi.org/10.1007/s10815-005-7482-x
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DOI: https://doi.org/10.1007/s10815-005-7482-x