Molecular Biology and Evolution, Vol 13, 623-632, Copyright © 1996 by Society for Molecular Biology and Evolution
ES Buckler 4th and TP Holtsford
Zea and Tripsacum nuclear ribosomal internal transcribed spacer (ITS)
sequences were used to evaluate patterns of concerted evolution, rates of
substitutions, patterns of methylation-induced deamination, and structural
constraints of the ITS. ITS pseudogenes were identified by their
phylogenetic position, differences in nucleotide composition, extensive
deamination at ancestral methylation sites, and substitutions resulting in
low-stability secondary RNA structures. Selection was important in shaping
the kinds of polymorphisms and substitutions observed in the ITS. ITS
substitution rates were significantly different among the Zea taxa.
Deamination of cytosines at methylation sites was a potent mutation source,
but selection appeared to maintain high methylation site density throughout
the ribosomal repeat except for the gene promoter. Nucleotide divergence
statistics identified selectively constrained regions at the 5' ends of the
ITS1 and ITS2.
ORIGINAL ARTICLE
Zea ribosomal repeat evolution and substitution patterns
Division of Biological Sciences, University of Missouri, Columbia 65211, USA. buckler@biosci.mbp.missouri.edu
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