Deletions and Amplifications of Tandemly Arranged Ribosomal 5s Genes Internal to a P Element Occur at a High Rate in a Dysgenic Context

AUTOR(ES)

Paques, F.

RESUMO

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.

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