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Nucleic Acids Research, 1990, Vol. 18, No. 20 5949-5954
© 1990

MOLECULAR BIOLOGY

‘Compensatory slippage’ in the evolution of ribosomal RNA genes

John M. Hancock and Gabriel A. Dover

Department of Genetics, University of Cambridge Downing Street, Cambridge CB2 3EH, UK

Received August 13, 1990. Revised September 28, 1990. Accepted September 28, 1990.

The distribution patterns of shared short repetitive motifs in the expansion segments of the large subunit rRNA genes of different species show that these segments are coevolving as a set and that in two examined vertebrate species the RNA secondary structures are conserved as a consequence of runs of motifs in one region being compensated by complementary motifs in another. These unusual processes, involving replication-slippage, have implications for the evolution of ribosomal RNA and for the use of the rDNA multigene family as a ‘molecular clock’ for assessing relationships between species.


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