Evolutionary analysis of apolipoprotein E by Maximum Likelihood and complex network methods

Area of Science:

• Evolutionary biology
• Molecular biology
• Bioinformatics

Background:

• Apolipoprotein E (apo E) is a crucial human glycoprotein involved in lipid transport.
• Understanding the evolutionary history of apo E is vital for comparative genomics and evolutionary studies.

Purpose of the Study:

• To conduct a comprehensive phylogenetic analysis of apolipoprotein E (apo E) across diverse animal taxa.
• To investigate the evolutionary relationships and common ancestry of apo E proteins.

Main Methods:

• Downloaded 32 apo E amino acid sequences from the National Center for Biotechnology Information (NCBI).
• Employed Maximum Likelihood (ML) for phylogenetic reconstruction.
• Utilized complex networks analysis to compare and validate phylogenetic findings.

Main Results:

• Phylogenetic analysis clearly separated apo E sequences into three major groups: mammals, fish, and amphibians.
• Both ML and complex network methods identified two distinct clusters: mammals (C1) and fish (C2), with amphibians forming a separate lineage.
• The study demonstrated strong concordance between the Maximum Likelihood and complex network approaches.

Conclusions:

• The complex network approach is an effective tool for phylogenetic studies, complementing traditional methods.
• Apolipoprotein E shows significant evolutionary conservation across diverse animal groups, indicating its fundamental biological role.
• The findings provide insights into the evolutionary divergence of apo E in vertebrates.