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Actin isoforms in amphioxus Branchiostoma lanceolatum

A Fagotti¹, I Di Rosa, F Simoncelli

¹Institute of Comparative Anatomy, University of Perugia, Via Pascoli, IT-06123 Perugia, Italy.

Cell and Tissue Research

|May 30, 1998

Summary

This study characterizes actin isoforms in amphioxus, a key vertebrate relative. Findings reveal conserved actin expression patterns, suggesting early gene duplication events before vertebrate evolution.

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Area of Science:

* Evolutionary biology
* Molecular and cellular biology
* Developmental biology

Background:

* Actin is a fundamental cytoskeletal protein found in all eukaryotes.
* Understanding actin expression in amphioxus (Branchiostoma lanceolatum) is crucial as it is the closest living relative to vertebrates.
* Limited information exists regarding the diversity and localization of actin isoforms in amphioxus.

Purpose of the Study:

* To characterize and localize various actin isoforms in amphioxus tissues.
* To investigate the expression patterns of beta-cytoplasmic, sarcomeric, and smooth muscle actins in amphioxus.
* To infer the evolutionary history of muscle actin gene duplication relative to vertebrate divergence.

Main Methods:

* Western blotting was employed to analyze protein extracts from amphioxus tissues.

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* Indirect immunofluorescence was used to determine the cellular and tissue localization of actin isoforms.

* Three specific antibodies against vertebrate actin isoforms (anti-beta actin, anti-alphaSR-1, anti-alphaSM-1) were utilized.

Main Results:

* Western blot analysis identified a 43-kDa band in amphioxus extracts, consistent with actin.
* Anti-beta actin primarily stained non-muscle cells, mirroring vertebrate patterns.
* Anti-alphaSR-1 localized to dorsolateral myotomal muscles, and anti-alphaSM-1 stained ventral muscles, indicating distinct muscle actin types.

Conclusions:

* At least two distinct muscle actin isoforms are present in amphioxus.
* The expression patterns of amphioxus actins are conserved with those of vertebrates.
* This suggests that muscle actin gene duplication occurred prior to the evolutionary split between vertebrates and the amphioxus lineage.