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Published on: April 2, 2013
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Propensity for proto-gene emergence in bacteria
Md Hassan Uz-Zaman1, Howard Ochman2
1Department of Molecular Biosciences, University of Texas at Austin, Austin, TX, 78712, USA.
Genome Biology
|October 22, 2025
Summary
New genes arise from non-coding DNA through proto-genes, but these rarely evolve into functional genes. While proto-genes emerge uniformly across bacteria, most show neutral evolution, limiting their role as gene precursors.
Area of Science:
- Genomics
- Molecular Biology
- Evolutionary Biology
Background:
- Gene birth from non-coding DNA is thought to involve a proto-gene phase.
- Proto-genes lack clear function but are abundant in bacterial genomes.
- The frequency of proto-gene emergence and their role as gene precursors remain unclear.
Purpose of the Study:
- Investigate the emergence and evolutionary fate of proto-genes in bacteria.
- Determine if proto-genes act as precursors for new functional genes.
- Analyze the rate and regulation of proto-gene origination across bacterial taxa.
Main Methods:
- Combined transcriptomic, proteomic, and comparative genomic analyses.
- Identification and characterization of novel, unannotated bacterial protein-coding genes.
- Assessment of sequence properties and evolutionary rates of novel proteins.
Main Results:
- Hundreds of novel bacterial proteins, many conserved, were identified.
- Most novel proteins exhibit neutral evolution, similar to non-coding DNA.
- Only one de novo proto-gene emergence was rigorously confirmed in Escherichia coli.
- Proto-genes emerge at a uniform rate across diverse bacterial taxa.
- Taxon-specific mechanisms appear to regulate proto-gene origination and persistence.
Conclusions:
- Proto-genes frequently emerge in bacterial populations.
- Proto-gene sequence properties provide limited evidence for their role as new gene precursors.
- Detecting de novo gene birth via proto-genes is challenging in bacterial genomes.
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