2014年9月12日 · These cells differentiate into a longitudinal muscle, the axochord, that is positioned between central nervous system and axial blood vessel and secretes a strong collagenous extracellular matrix. Ancestral state reconstruction suggests that contractile mesodermal midline cells existed in bilaterian ancestors.

The origin of the notochord is one of the key remaining mysteries of our evolutionary ancestry. Here, we present a multi‐level comparison of the chordate notochord to the axochord, a paired axial muscle spanning the ventral midline of annelid worms ...

2014年9月12日 · Lauri et al. report the identification of a longitudinal muscle in an annelid worm that displays striking similarities to the notochord regarding position, developmental origin, and expression profile. Similar muscles, termed axochords, are found in various invertebrate phyla.

2021年9月25日 · This review will provide some considerations on the two competing hypotheses for the origin of the notochord, the de novo theory and the axochord theory, and evaluate the relationship between the muscular amphioxus notochord and the annelid axochord.

In vertebrates, the notochord develops by convergence and extension of the chordamesoderm, a population of midline cells of unique molecular identity.We identify a population of mesodermal cells in a developing invertebrate, the marine annelid Platynereis dumerilii, that converges and extends toward the midline and expresses a notochord-specific...

2014年9月12日 · These cells differentiate into a longitudinal muscle, the axochord, that is positioned between central nervous system and axial blood vessel and secretes a strong collagenous extracellular...

Here, we present a multi-level comparison of the chordate notochord to the axochord, a paired axial muscle spanning the ventral midline of annelid worms and other invertebrates.

2022年7月5日 · Ancient origin for the axochord: a putative notochord homolog (Comment on DOI 10.1002/bies.201500027) Bioessays. 2015 Aug;37(8):834. doi: 10.1002/bies.201500075. Epub 2015 Jul 14. Author Daniel Meulemans Medeiros 1 Affiliation 1 …

The origin of the notochord is one of the key remaining mysteries of our evolutionary ancestry. Here, we present a multi-level comparison of the chordate notochord to the axochord, a paired axial muscle spanning the ventral midline of annelid worms and other invertebrates.

Integrating comparative evidence at the cell and organ level, we propose that the notochord evolved by modification of a ventromedian muscle followed by the assembly of an axial complex supporting swimming in vertebrate ancestors. .axochord; Keywords: evo-devo; evolution; mesoderm; musculature; notochord; urbilateria.