Molecular Biology and Evolution, Vol 12, 481-493, Copyright © 1995 by Society for Molecular Biology and Evolution
G Drouin and MM de Sa
We review all instances in which the nuclear 5S rRNA genes of fungi,
protist, nematode, and arthropod species have been reported to be linked to
the tandemly repeated units of the rDNA, trans-spliced leader, and histone
multigene families. The evolution of these gene arrangements is analyzed by
mapping them to independently derived phylogenies. These analyses show that
5S rRNA genes have repeatedly become linked to diverse tandemly repeated
gene families and that such linkages have also been subsequently inverted
or lost in some species. These variable gene linkages are probably the
result of stochastic gains and losses of variant repeat units, where
functional 5S rRNA had transposed, by the mechanisms which are responsible
for the concerted evolution of tandemly repeated multigene families. We
discuss the possible mechanisms of 5S rRNA gene transposition and suggest
that the characteristics of their promoter elements, transcription, and
termination signals may allow functional copies of these genes to be
fortuitously transposed through an RNA intermediate. We also review the
evidence which shows that the linked 5S rRNA gene copies are transcribed.
We conclude that the observed patterns of 5S rRNA gene linkages to the
repeat units of other tandemly repeated multigene families have likely
arisen due to fortuitous recombination events and are unlikely to represent
the remnants of an eubacterial-like arrangement of rDNA operons or to have
been established due to selective pressures.
ORIGINAL ARTICLE
The concerted evolution of 5S ribosomal genes linked to the repeat units of other multigene families
Biology Department, University of Ottawa, Ontario, Canada.
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