Phylogenetic position of Placozoa based on large subunit (LSU) and small subunit (SSU) rRNA genes
AUTOR(ES)
Silva, Fernanda Britto da, Muschner, Valéria C., Bonatto, Sandro L.
FONTE
Genetics and Molecular Biology
DATA DE PUBLICAÇÃO
2007
RESUMO
The phylum Placozoa, represented by its single species Trichoplax adhaerens, has always been considered one of the most basal animal clades due to its low morphological complexity. However, despite its importance, the phylogenetic position of the Placozoa remains uncertain, as does the relationships between the basal metazoans. We sequenced the nearly complete large subunit (LSU) of the T. adhaerens rRNA gene together with the small subunit (SSU) rRNA and used several methods to infer the phylogenetic position of Placozoa and the relationships between the basal animal phyla. The phylogenetic trees obtained from the LSU, SSU and SSU + LSU datasets support monophyly of all basal metazoan phyla, except the Porifera. However, the relationships between all these phyla were not consistently resolved due to a strong conflict between the LSU and SSU phylogenetic signals. The hypotheses that Placozoa is a derived Cnidaria or the most basal metazoan were not supported by our data. Moreover, our analyses suggests that Placozoa is most likely the sister group of Cnidaria and/or Bilateria.
Documentos Relacionados
- Sequence-Specific Cleavage of Small-Subunit (SSU) rRNA with Oligonucleotides and RNase H: a Rapid and Simple Approach to SSU rRNA-Based Quantitative Detection of Microorganisms
- Phylogenetic Analysis of Cryptosporidium Parasites Based on the Small-Subunit rRNA Gene Locus
- Phylogenetic position of Trimorphomyces papilionaceus based on 5S rRNA sequence.
- cDNA cloning and gene characterization of the mitochondrial large subunit (LSU) rRNA from the liver fluke Fasciola hepatica. Evidence of heterogeneity in the fluke mitochondrial genome.
- Evolutionary diversity of eukaryotic small-subunit rRNA genes.