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J Mol Evol
2008 Nov 01;675:539-50. doi: 10.1007/s00239-008-9171-8.
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Does hybridization increase evolutionary rate? Data from the 28S-rDNA D8 domain in echinoderms.
Chenuil A
,
Egea E
,
Rocher C
,
Touzet H
,
Féral JP
.
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The divergent domain D8 of the large ribosomal RNA is very variable and extended in vertebrates compared to other eukaryotes. We provide data from 31 species of echinoderms and present the first comparative analysis of the D8 in nonvertebrate deuterostomes. In addition, we obtained 16S mitochondrial DNA sequences for the sea urchin taxa and analyzed single-strand conformation polymorphism (SSCP) of D8 in several populations within the species complex Echinocardium cordatum. A common secondary structure supported by compensatory substitutions and indels is inferred for echinoderms. Variation mostly arises at the tip of the longest stem (D8a), and the most variable taxa also display the longest and most stable D8. The most stable variants are the only ones displaying bulges in the terminal part of the stem, suggesting that selection, rather than maximizing stability of the D8 secondary structure, maintains it in a given range. Striking variation in D8 evolutionary rates was evidenced among sea urchins, by comparison with both 16S mitochondrial DNA and paleontological data. In Echinocardium cordatum and Strongylocentrotus pallidus and S. droebachiensis, belonging to very distant genera, the increase in D8 evolutionary rate is extreme. Their highly stable D8 secondary structures rule out the possibility of pseudogenes. These taxa are the only ones in which interspecific hybridization was reported. We discuss how evolutionary rates may be affected in nuclear relative to mitochondrial genes after hybridization, by selective or mutational processes such as gene silencing and concerted evolution.
Addison,
Colonization, dispersal, and hybridization influence phylogeography of North Atlantic sea urchins (Strongylocentrotus droebachiensis).
2005, Pubmed,
Echinobase
Addison,
Colonization, dispersal, and hybridization influence phylogeography of North Atlantic sea urchins (Strongylocentrotus droebachiensis).
2005,
Pubmed
,
Echinobase
Bazin,
Population size does not influence mitochondrial genetic diversity in animals.
2006,
Pubmed
Ben Ali,
Construction of a variability map for eukaryotic large subunit ribosomal RNA.
1999,
Pubmed
Biermann,
Phylogeny and development of marine model species: strongylocentrotid sea urchins.
2003,
Pubmed
,
Echinobase
Biermann,
Carbohydrate-based species recognition in sea urchin fertilization: another avenue for speciation?
2004,
Pubmed
,
Echinobase
Chenuil,
Evolution of the large-subunit ribosomal RNA binding site for protein L23/25.
1997,
Pubmed
Clote,
Combinatorics of saturated secondary structures of RNA.
2006,
Pubmed
Dover,
Linkage disequilibrium and molecular drive in the rDNA gene family.
1989,
Pubmed
Duran,
Genetic diversity and population structure of the commercially harvested sea urchin Paracentrotus lividus (Echinodermata, Echinoidea).
2004,
Pubmed
,
Echinobase
Felsenstein,
Evolutionary trees from DNA sequences: a maximum likelihood approach.
1981,
Pubmed
Gorski,
The secondary structure of human 28S rRNA: the structure and evolution of a mosaic rRNA gene.
1987,
Pubmed
Hassouna,
The complete nucleotide sequence of mouse 28S rRNA gene. Implications for the process of size increase of the large subunit rRNA in higher eukaryotes.
1984,
Pubmed
Hillis,
Ribosomal DNA: molecular evolution and phylogenetic inference.
1991,
Pubmed
Hofacker,
Vienna RNA secondary structure server.
2003,
Pubmed
Hudelot,
RNA-based phylogenetic methods: application to mammalian mitochondrial RNA sequences.
2003,
Pubmed
Kondrashov,
Dobzhansky-Muller incompatibilities in protein evolution.
2002,
Pubmed
Kovarik,
Evolution of rDNA in Nicotiana allopolyploids: a potential link between rDNA homogenization and epigenetics.
2008,
Pubmed
Lee,
Molecular phylogenies and divergence times of sea urchin species of Strongylocentrotidae, Echinoida.
2003,
Pubmed
,
Echinobase
Lenaers,
The secondary structure of large-subunit rRNA divergent domains, a marker for protist evolution.
1988,
Pubmed
Metz,
Mitochondrial DNA and bindin gene sequence evolution among allopatric species of the sea urchin genus Arbacia.
1998,
Pubmed
,
Echinobase
Michot,
Comparisons of large subunit rRNAs reveal some eukaryote-specific elements of secondary structure.
1987,
Pubmed
Muir,
Three divergent rDNA clusters predate the species divergence in Quercus petraea (Matt.) Liebl. and Quercus robur L.
2001,
Pubmed
Márquez,
Pseudogenes contribute to the extreme diversity of nuclear ribosomal DNA in the hard coral Acropora.
2003,
Pubmed
Pikaard,
Nucleolar dominance: uniparental gene silencing on a multi-megabase scale in genetic hybrids.
2000,
Pubmed
Smith,
Testing the molecular clock: molecular and paleontological estimates of divergence times in the Echinoidea (Echinodermata).
2006,
Pubmed
,
Echinobase
Sweeney,
An rRNA variable region has an evolutionarily conserved essential role despite sequence divergence.
1994,
Pubmed
Uhlenbeck,
Tetraloops and RNA folding.
1990,
Pubmed
Woese,
Architecture of ribosomal RNA: constraints on the sequence of "tetra-loops".
1990,
Pubmed