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. 1994 Mar;14(3):1613–1625. doi: 10.1128/mcb.14.3.1613

Efficient copying of nonhomologous sequences from ectopic sites via P-element-induced gap repair.

N Nassif 1, J Penney 1, S Pal 1, W R Engels 1, G B Gloor 1
PMCID: PMC358520  PMID: 8114699

Abstract

P-element-induced gap repair was used to copy nonhomologous DNA into the Drosophila white locus. We found that nearly 8,000 bp of nonhomologous sequence could be copied from an ectopic template at essentially the same rate as a single-base substitution at the same location. An in vitro-constructed deletion was also copied into white at high frequencies. This procedure can be applied to the study of gene expression in Drosophila melanogaster, especially for genes too large to be manipulated in other ways. We also observed several types of more complex events in which the copied template sequences were rearranged such that the breakpoints occurred at direct duplications. Most of these can be explained by a model of double strand break repair in which each terminus of the break invades a template independently and serves as a primer for DNA synthesis from it, yielding two overlapping single-stranded sequences. These single strands then pair, and synthesis is completed by each using the other as a template. This synthesis-dependent strand annealing (SDSA) model as a possible general mechanism in complex organisms is discussed.

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Selected References

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