[Isolation, phylogenetic analysis and developmental expression parttern of AmphiRab23b in amphioxus]

Area of Science:

• Developmental Biology
• Evolutionary Biology
• Molecular Biology

Background:

• The hedgehog (Hh) signaling pathway is vital for embryonic development and implicated in cancer progression.
• Rab23 is a critical protein within the Hh pathway, but its function in invertebrates like amphioxus remains largely uncharacterized.

Purpose of the Study:

• To isolate and characterize the Rab23 gene from the Chinese amphioxus (Branchiostoma belcheri).
• To investigate the evolutionary conservation and developmental expression of amphioxus Rab23 (AmphiRab23b).

Main Methods:

• Isolation of a full-length cDNA sequence for AmphiRab23b.
• Bioinformatic analysis including phylogenetic and domain analysis.
• Analysis of AmphiRab23b expression patterns during embryonic development.

Main Results:

• A 2062 bp cDNA sequence of AmphiRab23b was identified, encoding a 237-amino acid protein.
• Phylogenetic analysis placed AmphiRab23b outside the vertebrate clade, yet sequence analysis revealed a conserved Rab23_like domain.
• AmphiRab23b expression was detected in the developing neural plate and alimentary canal.

Conclusions:

• The Rab23 gene exhibits functional conservation throughout evolution, as evidenced by the conserved Rab23_like domain in AmphiRab23b.
• AmphiRab23b likely plays a role in the development of the nervous system and alimentary canal in amphioxus, mirroring functions of homologous genes in vertebrates.