Divergent paralogues of ribosomal DNA in eucalypts (Myrtaceae).

Abstract:

:The presence of divergent paralogues of nuclear ribosomal DNA, from the 18S-5.8S-26S cistron, is reported in members of Eucalyptus subg. Eucalyptus. These paralogues, which include non-functional pseudogenes, probably diverged prior to the differentiation of species groups in subg. Eucalyptus. When compared with presumably functional sequences, the pseudogenes show greater sequence variation between species, particularly in the 5.8S gene. They are also characterised by reduced GC content, associated with a reduced number of CpG and CpNpG methylation sites, and an increase in the inferred number of methylation-induced substitutions. Some pseudogenes also lack motifs that are usually conserved in plants, both in ITS1 and the 5.8S gene. Two main lineages of pseudogenes are identified, one isolated from a group of western Australian species, one from a group of eastern Australian species. It is not clear whether these two lineages of pseudogenes are orthologous, or represent independent divergences from functional sequence types. The presence of divergent rDNA paralogues highlights the need for caution when interpreting eucalypt phylogenies based on ITS sequences.

journal_name

Mol Phylogenet Evol

authors

Bayly MJ,Ladiges PY

doi

10.1016/j.ympev.2006.10.027

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

346-56

issue

1

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(06)00427-1

journal_volume

44

pub_type

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