• Publications
  • Influence
Resolving Difficult Phylogenetic Questions: Why More Sequences Are Not Enough
TLDR
Three recent large-scale phylogenomics studies, which deal with the early diversification of animals, produced highly incongruent findings despite the use of considerable sequence data, suggesting that merely adding more sequences is not enough to resolve the inconsistencies. Expand
Phylogenomics Revives Traditional Views on Deep Animal Relationships
TLDR
It is shown that the sponges (Porifera) are monophyletic and not paraphyletic as repeatedly proposed, thus undermining the idea that ancestral metazoans had a sponge-like body plan and that the most likely position for the ctenophores is together with the cnidarians in a "coelenterate" clade. Expand
Molecular phylogeny of Demospongiae: implications for classification and scenarios of character evolution.
TLDR
The topology derived from molecular data provides a basis for proposing a new classification of Demospongiae s.s., and suggests a reverse polarity of some characters, with respect to traditional conceptions: viviparity, presence of monaxon spicules and of spongin appear to be ancestral, whereas ovip parity, and presence of tetraxon spicule appear as derived characters. Expand
Improved Phylogenomic Taxon Sampling Noticeably Affects Nonbilaterian Relationships
TLDR
This work recovers monophyletic Porifera as the sister group to all other Metazoa and suggests that the basal position of the fast-evolving Ctenophora proposed by Dunn et al. was due to LBA and that broad taxon sampling is of fundamental importance to metazoan phylogenomic analyses. Expand
Sponge paraphyly and the origin of Metazoa
TLDR
The polymerase chain reaction is used to amplify almost the entire nucleic acid sequence of the 18S rDNA from several hexactinellid, demosponge and calcareous sponge species to suggest that sponges are paraphyletic, the Calcarea being more related to monophyletic Eumetazoa than to the siliceous spongees. Expand
Are Hox Genes Ancestrally Involved in Axial Patterning? Evidence from the Hydrozoan Clytia hemisphaerica (Cnidaria)
TLDR
The phylogenetic analyses do not support an origin of ParaHox and Hox genes by duplication of an ancestral ProtoHox cluster, and reveal a diversification of the cnidarian HOX9-14 genes into three groups called A, B, C. Expand
Somatic stem cells express Piwi and Vasa genes in an adult ctenophore: ancient association of "germline genes" with stemness.
TLDR
Investigation of the expression of Vasa, two Piwi paralogues, Bruno and PL10 in Pleurobrachia pileus, a member of the early-diverging phylum Ctenophora, is investigated, revealing important aspects of cell renewal within the ctenophore body and suggesting that Piwi,Vasa, Bruno, andPL10 belong to a gene network ancestrally acting in two distinct contexts. Expand
Phylogeny and evolution of calcareous sponges: monophyly of calcinea and calcaronea, high level of morphological homoplasy, and the primitive nature of axial symmetry.
TLDR
The phylogeny implies that characters of the skeleton architecture are highly homoplastic, as areCharacters of the aquiferous system, however, axial symmetry seems to be primitive for all Calcispongia, a conclusion that has potentially far-reaching implications for hypotheses of early body plan evolution in Metazoa. Expand
Expansion of the SOX gene family predated the emergence of the Bilateria.
TLDR
The topology of gene relationships deduced by Maximum Likelihood analysis suggested that the SOX family started to diversify in the metazoan stem branch prior to the divergence of demosponges, and that further diversification occurred in the eumetazoan branch, as well as later in calcispongses, ctenophores, cnidarians and vertebrates. Expand
A Large and Consistent Phylogenomic Dataset Supports Sponges as the Sister Group to All Other Animals
TLDR
The reconstruction of deep metazoan relationships using a 1,719-gene dataset with dense taxonomic sampling of non-bilaterian animals that was assembled using a semi-automated procedure, designed to reduce known error sources outperforms previous metazoa gene superalignments in terms of data quality and quantity. Expand
...
1
2
3
4
5
...