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Journal of General Virology (2002), 83, 1573-1578.
© 2002 Society for General Microbiology

Animal: DNA Viruses

Homologous recombination between the inverted terminal repeats of defective transposon TCp3.2 causes an inversion in the genome of Cydia pomonella granulovirus

Hugo M. Arends1 and Johannes A. Jehle1

State Education and Research Center for Agriculture, Viticulture and Horticulture (SLFA), Biotechnological Crop Protection, Breitenweg 71, 67435 Neustadt/Weinstr., Germany1

Author for correspondence: Johannes Jehle. Fax +49 6321 671 222. e-mail jjehle.slfa-nw{at}agrarinfo.rlp.de

In this study, a new mutant of the Cydia pomonella granulovirus (CpGV), which shows spontaneous inversion of a transposable element during in vivo replication, is described. CpGV-MCp4 is a natural mutant of CpGV-M, containing the transposable element TCp3.2, which originated from the genome of the host C. pomonella. During in vivo cloning studies of CpGV-MCp4, a mutant called CpGV-MCp4inv was isolated. CpGV-MCp4inv shows heterogeneity in the genome area of transposon insertion. Restriction mapping, PCR analysis and subsequent sequence analysis gave strong evidence that an inversion of TCp3.2 is caused by homologous recombination between the long inverted terminal repeats (ITRs) of the transposon. This finding demonstrated that extensive homologous repeat regions such as the ITRs of transposons cause inversions by homologous recombination during in vivo replication. The observed in vivo inversion between the ITRs can be considered as a model for the contribution of repeated sequences in the genome rearrangement of baculoviruses and a source for genetic heterogeneity among different baculoviruses and baculovirus genotypes.




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