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[Evolution of the locomotor-sensory systems]
Arkhiv Anatomii, Gistologii I Embriologii
|August 1, 1990
Summary
Physical factors like ligands drive the evolution of the locomotor-sensory system (LSS). This system
Area of Science:
- Evolutionary biology
- Molecular biology
- Biophysics
Background:
- The locomotor-sensory system (LSS) is influenced by physical factors such as gravitation, photon energy, and environmental oscillations.
- Molecular components of the LSS, including tubulin, dinein, actin, and myosin, are conserved across prokaryotes and eukaryotes.
- Sensory molecules like rhodopsin and various receptors are synthesized and localized in flagellar membranes, a feature conserved from eukaryotes to metazoans.
Purpose of the Study:
- To investigate the evolutionary role of physical factors and molecular components in the development of the locomotor-sensory system.
- To elucidate the conserved molecular mechanisms underlying locomotion and sensory perception across different life forms.
- To identify the evolutionary origins and conservation of the spatial model of synaptic connections in the LSS.
Main Methods:
- Comparative molecular analysis of LSS components across prokaryotes, eukaryotes, and metazoans.
- Examination of gene expression patterns related to tubulin, dinein, actin, and myosin.
- Histological and ultrastructural analysis of sensory and motor apparatus in various organisms, including Ctenophora.
Main Results:
- Ligands are identified as key directing physical factors in LSS evolution.
- Conserved molecular machinery for locomotion (tubulin, dinein, actin, myosin) and sensory perception (rhodopsin, receptors) is present in both prokaryotes and eukaryotes.
- A conserved spatial model of synaptic connections, regulated by sensory organs and the central nervous system, was discovered in Ctenophora and is preserved across deuterostomes and protostomes.
Conclusions:
- The evolution of the LSS is significantly shaped by physical factors and conserved molecular building blocks.
- Sensory and motor functions are intricately linked through conserved molecular mechanisms and a unified spatial synaptic model.
- The discovery in Ctenophora highlights a fundamental, evolutionarily preserved organizational principle of the LSS across diverse animal phyla.