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Updated: May 12, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

Phylogenomics supports a cellularly structured urancestor.

Manfredo J Seufferheld¹, Gustavo Caetano-Anollés

¹Department of Crop Sciences, University of Illinois, Urbana, IL 61801, USA.

Journal of Molecular Microbiology and Biotechnology

|April 26, 2013

Summary

The earliest life forms, existing 2.9 billion years ago, were complex, cellularly structured entities. These primordial cells likely possessed organelles for energy storage, fueling early metabolism and supporting microbial communities.

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Area of Science:

Origin of Life studies
Cellular Biology
Biochemistry

Background:

Cells and viruses exhibit complex organization with specialized compartments and organelles.
Early life forms possessed intricate structures for energy harvesting and genetic material storage.

Purpose of the Study:

To reconstruct the protein repertoire of the urancestor (common ancestor of life).
To investigate the structural and functional complexity of early life.
To provide evidence for urancestral storage organelles.

Main Methods:

Structural phylogenomic reconstruction of the urancestor's protein repertoire.
Analysis of cellular structures and bioenergetic pathways.

Main Results:

The urancestor, existing 2.9 billion years ago, was structurally and functionally complex and cellularly organized.
Evidence supports the existence of urancestral storage organelles analogous to acidocalcisomes.
These organelles likely accumulated energy-rich compounds like polyphosphates, crucial for early metabolism.

Conclusions:

Early life was characterized by complex cellular structures and sophisticated bioenergetics.
The findings align with microfossil evidence of microbial communities dating back 3.4 billion years.
Cellular compartmentalization and bioenergetics were central to early evolution.