Phylogenomics reveals deep molluscan relationships
This work uses transcriptome and genome data from all major lineages (except Monoplacophora) and recovers a well-supported topology for Mollusca to propose the node-based name Pleistomolluscan, which strongly support the Aculifera hypothesis and finds support for advanced cephalization and shells as possibly having multiple origins within Mollsusca.
Phylogenomic analyses unravel annelid evolution
It is shown that phylogenomic analyses of 34 annelid taxa, using 47,953 amino acid positions, recovered a well-supported phylogeny with strong support for major splits and Ancestral character trait reconstructions indicate that these clades show adaptation to either an errant or a sedentary lifestyle.
New phylogenomic data support the monophyly of Lophophorata and an Ectoproct-Phoronid clade and indicate that Polyzoa and Kryptrochozoa are caused by systematic bias
The phylogenetic analyses strongly support the monophyly of Lophophorata and a sister-group relationship between Ectoprocta and Phoronida, indicating that the support for Polyzoa, Brachiozoa and Kryptrochozoa gathered so far is likely an artifact caused by compositional bias.
Phylogenomics of Lophotrochozoa with Consideration of Systematic Error
Although the analyses do not unambiguously resolve lophotrochozoan phylogeny, they advance the field by reducing the list of viable hypotheses and can be applied to explore sources of incongruence and poor support in any phylogenomic data set.
Fast evolving 18S rRNA sequences from Solenogastres (Mollusca) resist standard PCR amplification and give new insights into mollusk substitution rate heterogeneity
The extreme morphological diversity of mollusks is mirrored in the molecular 18S data and shows elevated substitution rates mainly in three higher taxa: true limpets, Cephalopoda and Solenogastres and the phylogenetic tree based on 123 species shows limited resolution at the class level but illustrates the pitfalls of artificial groupings formed due to shared biased sequence composition.
Minireview: Recent progress in hemocyanin research.
- H. Decker, N. Hellmann, E. Jaenicke, B. Lieb, U. Meissner, J. Markl
- BiologyIntegrative and Comparative Biology
- 1 October 2007
It is shown that hemocyanins from species living at different environmental temperatures have a cooperativity optimum at the typical temperature of their natural habitat and the catalysis mechanism itself can now be explained on the basis of the recently published crystal structure of a tyrosinase.
MOLECULAR PHYLOGENY AND THE GEOGRAPHIC ORIGIN OF HALIOTIDAE TRACED BY HAEMOCYANIN SEQUENCES
Two genetically different monophyletic groups with high bootstrap support are distinguished: the abalones from Europe, South Africa, Australia, Taiwan and Japan group together and are separated from (ii) five California and two Japanese ab alones.
Spiralian phylogenomics supports the resurrection of Bryozoa comprising Ectoprocta and Entoprocta.
The findings suggest that classical developmental and morphological key characters such as cleavage pattern, coelomic cavities, gut architecture, and body segmentation are subject to greater evolutionary plasticity than traditionally assumed.
Identification of a novel mRNA-associated protein in oocytes of Pleurodeles waltl and Xenopus laevis.
The expression pattern and intracellular distribution of RAP55 suggest that it is part of those mRNP particles which are translationally repressed during oogenesis and become activated upon progesterone-induced oocyte maturation.
cDNA Sequence, Protein Structure, and Evolution of the Single Hemocyanin from Aplysia californica, an Opisthobranch Gastropod
Hemocyanin polypeptide in an opisthobranch gastropod, the sea hare Aplysia californica, contrasts with previously studied prosobranch gastropods, which express two distinct isoforms of this extracellular respiratory protein.