Aboral

Notably, Wnt genes are expressed in staggered domains along the oral-aboral axis in ❋ Unknown (2009)

At this stage transcripts are localised at the anterior / aboral pole, in a few ectodermal cells (figure 2O). ❋ Unknown (2009)

In contrast, expression of "anterior" vs. "posterior" genes in different domains along the oral-aboral axis, potentially evoking trans-collinearity, has been reported in ❋ Unknown (2009)

Most studies have interpreted Hox genes pattern restricted along the oral-aboral axis as probably reflecting a role of cnidarian Hox genes in axial patterning ❋ Unknown (2009)

Cnidarian Hox genes have experienced a wide diversification in their expression sites, with orthologous genes being expressed at different stages during life cycle, in different germ layers, and at different locations, notably with respect to the oral-aboral axis. ❋ Unknown (2009)

They share a unique body plan with a single polarity axis (the oral-aboral axis) but exhibit various life cycles, comprising a pelagic (polyp) or a benthic form (medusa) or both alternating. ❋ Unknown (2009)

"Posterior" (HOX9-14) genes have restricted expression sites along the oral-aboral axis of the planula, but with two paralogues ❋ Unknown (2009)

Clytia HOX9-14 group C gene CheHox9-14C, expressed at the aboral pole of the planula, is orthologous to ❋ Unknown (2009)

In the 1-day old planula they are concentrated in the ectoderm at both the oral and aboral poles (figure 3F). ❋ Unknown (2009)

Among the 7 examined genes, only those belonging to the HOX9-14 and the CDX groups exhibit a restricted expression along the oral-aboral axis during development and in the planula larva, while the others are expressed in very specialised areas at the medusa stage. ❋ Unknown (2009)

In addition, when orthologous genes are expressed at the same stage, their transcripts are often localised at opposite poles along the oral-aboral axis. ❋ Unknown (2009)

Under the hypothesis of a conserved role for Hox genes in patterning the cnidarian main body axis, not only their expression should be collinear, but orthologous Hox genes from different cnidarian species are expected to be expressed in similar domains along the oral-aboral axis. ❋ Unknown (2009)

PcaCnox1 has an expression in the larva localised at the aboral pole in both the endoderm and the ectoderm ❋ Unknown (2009)

The proposal that cnidarian Hox genes have a role in patterning the oral-aboral axis, reminiscent of the "Hox code" conserved among bilaterian species, was initially prompted by the direct comparison of Hox expression patterns obtained in ❋ Unknown (2009)

Transcripts are firstly detected in the unfertilised eggs in the whole cytoplasm but they are absent from the area surrounding the nucleus, corresponding to the animal pole and to the future aboral end of the polyp (figure 2A). ❋ Unknown (2009)

However, the expression of these four Hox genes along the oral-aboral axis shows no evidence of cis-collinearity, ❋ Unknown (2009)

Duboc V, Rottinger E, Besnardeau L, Lepage T (2004) Nodal and BMP2 / 4 signaling organizes the oral-aboral axis of the sea urchin embryo. ❋ Unknown (2009)

Cross species comparison reveals a strong variability of gene expression along the oral-aboral axis and during the life cycle among cnidarian lineages. ❋ Unknown (2009)

The Clytia HOX1 gene is not expressed along the oral-aboral axis but specifically in medusa sensory organs ❋ Unknown (2009)

Expression data in the sea anemone (Anthozoa) have even led to the conclusion that the bilaterian antero-posterior and the cnidarian oral-aboral axes are homologous ❋ Unknown (2009)