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The Tre2 (USP6) oncogene is a hominoid-specific gene
Charles A Paulding1, Maryellen Ruvolo, Daniel A Haber
1Massachusetts General Hospital Cancer Center and Harvard Medical School, Charlestown, MA 02129, USA.
Summary
The Tre2 oncogene, specific to hominoids, arose from a fusion of ancient USP32 and recent TBC1D3 genes. This hominoid-specific gene emerged recently and may have driven hominoid speciation.
Area of Science:
- Evolutionary genetics
- Genomics
- Molecular biology
Background:
- Gene duplication and domain accretion are key drivers of novel gene evolution.
- Recent genomic studies reveal extensive gene amplification in higher primates.
- The origins of primate-specific genes remain an active area of research.
Purpose of the Study:
- To investigate the evolutionary origin of the Tre2 (USP6) oncogene.
- To determine the ancestral genes and duplication events contributing to Tre2.
- To explore the potential role of Tre2 in primate speciation.
Main Methods:
- Comparative genomics
- Phylogenetic analysis
- Gene expression analysis
Main Results:
- The Tre2 oncogene resulted from a chimeric fusion of USP32 and TBC1D3.
- USP32 is ancient and conserved, while TBC1D3 arose from a recent primate-specific segmental duplication.
- Tre2 is exclusively found in hominoids, emerging 21-33 million years ago.
- Tre2 exhibits testis-specific expression, unlike the broad expression of its ancestral genes.
Conclusions:
- The fusion event creating Tre2 is a hominoid-specific innovation.
- The rapid amplification and unique expression pattern of Tre2 suggest a role in reproductive isolation.
- Emergence of chimeric genes like Tre2 may have contributed to hominoid speciation.