Origins of Extra Genes in Aspergillus oryzae
Author Information
Author(s): Nora Khaldi, Kenneth H. Wolfe, Sudhindra Gadagkar
Primary Institution: Smurfit Institute of Genetics, Trinity College, Dublin, Ireland
Hypothesis
Where did the extra genes in Aspergillus oryzae come from?
Conclusion
The study suggests that the extra genes in Aspergillus oryzae may have originated from multiple horizontal gene transfer events rather than from ancient whole-genome duplications.
Supporting Evidence
- A. oryzae has approximately 20% more genes than A. nidulans and A. fumigatus.
- Phylogenetic analysis revealed an excess of divergent paralogous gene copies in A. oryzae.
- One-third of the extra genes showed signs of horizontal gene transfer from Sordariomycete species.
Takeaway
Aspergillus oryzae has more genes than its close relatives, and scientists think these extra genes came from other fungi rather than from duplicating its own genes.
Methodology
The study involved phylogenetic analysis of gene pairs and statistical tests to evaluate gene duplication and horizontal gene transfer.
Potential Biases
Potential biases may arise from the reliance on specific phylogenetic methods and the limited dataset.
Limitations
The analysis was limited by data loss and the inability to identify all extra genes in A. oryzae.
Statistical Information
P-Value
p<10−4
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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