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. 1996 Feb;178(3):862–870. doi: 10.1128/jb.178.3.862-870.1996

Spiroplasma citri virus SpV1-derived cloning vector: deletion formation by illegitimate and homologous recombination in a spiroplasmal host strain which probably lacks a functional recA gene.

A Marais 1, J M Bové 1, J Renaudin 1
PMCID: PMC177736  PMID: 8550524

Abstract

We have previously described the use of the replicative form (RF) of Spiroplasma citri virus SpV1 as a vector for expressing an epitope of the P1 adhesin protein from Mycoplasma pneumoniae in S. citri (A. Marais, J. M. Bové, S.F. Dallo, J. B. Baseman, and J. Renaudin, J. Bacteriol. 175:2783-2787, 1993). We have now studied the structural instability of the recombinant RF leading to loss of the DNA insert. Analyses of viral clones with deletions have shown that both illegitimate and homologous recombination were involved in deletion formation. For one such clone, deletion has occurred via a double crossing-over exchange between the circular free viral RF and SpV1 viral sequences present in the S. citri host chromosome. The homologous recombination process usually requires the RecA protein. However, characterization of the recA gene of the S. citri R8A2 host strain revealed that over two-thirds of the open reading frame of the recA gene was deleted from the C-terminal part, indicating that this particular strain is probably RecA deficient.

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Selected References

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