Vertebrate paralogous CRMPs in nervous system: evolutionary, structural, and functional interplay.

Area of Science:

• Neuroscience
• Evolutionary Biology
• Genomics

Background:

• Collapsin response mediator proteins (CRMPs) are crucial for neural network formation during development.
• The evolutionary history and selection pressures on CRMPs in vertebrates remain largely unexplored.

Purpose of the Study:

• To conduct a comprehensive bioinformatics analysis of the CRMP family in vertebrates.
• To investigate the phylogenetic relationships, evolutionary transitions, and selection pressures acting on CRMPs.
• To identify key amino acid residues influencing CRMP functional divergence.

Main Methods:

• Phylogenetic analysis using genome data to identify CRMP homologues.
• Application of site-specific, branch-specific, and branch-site models to estimate molecular substitution rates and detect positive selection.
• Protein structure analysis to assess functional significance.

Main Results:

• Evidence suggests CRMP family expansion in vertebrates potentially through gene duplication, leading to five members.
• Evolutionary transitions between CRMP gene clusters correlate with functional property changes.
• Nineteen positively selected sites and critical amino acid residues were identified, linked to distinct paralogue functions.

Conclusions:

• This study provides the first detailed phylogeny and evolutionary selection analysis of the CRMP family in vertebrates.
• Identified CRMP evolutionary dynamics and functional residues offer insights into nervous system development and disease pathogenesis.
• Findings suggest potential avenues for targeted therapies informed by molecular evolution.