Primate TNF Promoter Evolution and Innate Immunity
Author Information
Author(s): Andres Baena, Alan R. Mootnick, James V. Falvo, Alla V. Tsytsykova, Filipa Ligeiro, Ousmane M. Diop, Claudia Brieva, Pascal Gagneux, Stephen J. O'Brien, Oliver A. Ryder, Anne E. Goldfeld
Primary Institution: The CBR Institute for Biomedical Research, Harvard Medical School, Boston, Massachusetts, United States of America
Hypothesis
Certain fixed genetic differences in the TNF promoter serve as markers of primate speciation.
Conclusion
The study identifies fixed genetic differences in the TNF promoter that impact transcription factor binding and TNF gene activation in response to bacterial stimulation.
Supporting Evidence
- 332 fixed genetic differences were identified in the TNF promoters across primate species.
- 41 of these fixed differences serve as markers of primate species and subspecies.
- Asian ape-specific fixed differences impair transcription factor binding and decrease TNF transcription.
- The proximal TNF promoter shows high sequence conservation among primates.
- Distinct alleles of human TNF promoter SNPs correspond to divergent sequences in the primate lineage.
- Fixed differences in the TNF promoter distinguish primate phylogeny.
- Functional analysis showed that certain genetic differences affect TNF gene activation in response to bacterial infection.
Takeaway
Scientists studied the DNA of different primates to see how their immune system genes have changed over time, finding important differences that affect how these genes work.
Methodology
A comparative genomics approach was used to analyze approximately 1.2 kb of the TNF promoter from 29 non-human primate species.
Limitations
The study is limited by the number of species sampled and the focus on specific genetic regions.
Participant Demographics
The study included multiple individuals representing all species of great apes and various Old World and New World monkeys.
Digital Object Identifier (DOI)
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