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Updated: Feb 18, 2026
09:06
Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
Published on: July 3, 2016
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Resurrecting ancestral genes in bacteria to interpret ancient biosignatures
Betul Kacar1, Lionel Guy2, Eric Smith3,4
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA betul@arizona.edu.
Summary
Scientists reconstructed ancient proteins from modern organisms to understand early life and Earth's history. This method, called palaeophenotype reconstruction, links molecular evolution to geological biosignatures.
Area of Science:
- Evolutionary Biology
- Geochemistry
- Molecular Biology
Background:
- Life's evolution is intertwined with Earth's changing environment over 3.8 billion years.
- Organismal survival relies on adapting genetic and metabolic components to environmental shifts.
- The geologic record shows environmental changes, but molecular details of life's influence are scarce.
Purpose of the Study:
- To reconstruct ancestral protein sequences and their functions.
- To link inferred ancient molecular behaviors to geological biosignatures.
- To develop palaeophenotype reconstruction as a method for studying deep evolutionary history.
Main Methods:
- Inferring ancient protein sequences from extant genetic diversity.
- Resurrecting inferred ancestral proteins in the laboratory.
- Assessing the biochemical attributes and phenotypes of resurrected proteins.
Main Results:
- Successfully reconstructed the ancestral beta-carbonic anhydrase protein sequence.
- Demonstrated the feasibility of palaeophenotype reconstruction for linking molecular function to geological records.
- Identified carbonic anhydrase as a suitable protein for ancient biosignature reconstruction.
Conclusions:
- Ancestral protein reconstruction and palaeophenotype analysis offer a powerful approach to studying early life.
- This method bridges molecular evolution, organismal adaptation, and geological history.
- It provides a novel way to investigate the co-evolution of life and Earth's environment.
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