germ layers homology

[ANiknejad]

here the paper's record for later annotating ...(how actually?...)

https://www.ncbi.nlm.nih.gov/pubmed/?term=29185520

Gut-like ectodermal tissue in a sea anemone challenges germ layer homology.

"Currently, cnidarian endoderm (that is, 'mesendoderm') is considered homologous to both bilaterian endoderm and mesoderm....our data supports an alternative model of germ layer homologies, where cnidarian pharyngeal ectoderm corresponds to bilaterian endoderm, and the cnidarian endoderm is homologous to bilaterian mesoderm."

(see also obophenotype/uberon#578)

Comments on this paper:

https://phys.org/news/2017-09-evolutionary-gut.html

"The results completely change the way we think of the origin of germ layers. It means that 'endoderm' in sea anemones and vertebrates, although they are called the same, are actually not evolutionary related" adds Ulrich Technau.

[ANiknejad]

Annotation DONE at least for 'mesoderm':

UBERON:0000926 mesoderm

33213 Bilateria

ECO:0000355 phylogenetic distribution evidence

CIO:0000004 Medium confidence assertion

Even if it is referred to 'bilaterian mesoderm', there are still controversy, see this link here, (Neural Crest Workshop Notes February 22, 2012, from http://www.phenotypercn.org/, Phenotype Ontology Research Coordination Network (RCN))

https://docs.google.com/document/d/1-4QZnWGIBZBKLsOccd6mcB44BREv5bhHamCBVWnQAQ4/edit

"mesoderm evolved more than once", said Terry Hayamizu

[ANiknejad]

see also

obophenotype/uberon#1329