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We observed unusual kinds of rearrangements within tandemly clustered 5S genes internal to a P element in dysgenic context. Rearranged P transposons, initially containing eight 5S genes, were found to display discrete numbers of 5S genes, from 4 up to 17 units. Precise deletions and amplifications occurred at a high rate (40%), at both original and new insertion sites. These events can be explained by a "cut and paste" transposition model. Possible links between rearrangements due to dysgenic-like processes and concerted evolution are discussed.

Deletions and amplifications of tandemly arranged ribosomal 5S genes internal to a P element occur at a high rate in a dysgenic context.