Examining Ancient Inter-domain Horizontal Gene Transfer
Author Information
Author(s): Francisca C. Almeida, Magdalena Leszczyniecka, Paul B. Fisher, Rob DeSalle
Primary Institution: Department of Biology, New York University
Hypothesis
Can we detect ancient inter-domain horizontal gene transfer (IDHGT) among the ancestors of Eukarya, Archaea, and Bacteria?
Conclusion
The study suggests that ancient inter-domain horizontal gene transfer is rare and mostly restricted to specific cases involving symbiosis and adaptations.
Supporting Evidence
- The study identified 95 genes found exclusively in Bacteria and Archaea and 86 genes found in Bacteria and Eukarya.
- Only three genes in the Bacteria + Eukarya class and three genes in the Bacteria + Archaea class showed evidence of ancient IDHGT.
- The results indicate that robust estimates of IDHGT will be very difficult to obtain due to methodological limitations.
Takeaway
Scientists looked at genes in E. coli to see if they moved between different types of organisms a long time ago, and found that it doesn't happen very often.
Methodology
The study used phylogenetic analysis and a new statistical test called the node height test to examine gene transfers.
Limitations
The study was limited by the dataset of E. coli genes and the challenges of detecting ancient gene transfers due to sequence saturation.
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