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Evolutionary divergence of TLR9 through ancestral sequence reconstruction
Manisha Ghosh1, Surajit Basak2, Shanta Dutta3
1Division of Bioinformatics, ICMR-National Institute of Cholera and Enteric Diseases, P-33, C.I.T Road, Scheme-XM, Beliaghata Kolkata, 700010, India.
Toll-like receptors (TLRs) are key to innate immunity. This study reveals unique evolutionary patterns in mammalian TLR9, driven by sequence features and gradual mutations, differentiating it from other TLRs.
Area of Science:
- Immunology
- Molecular Evolution
- Genomics
Background:
- Toll-like receptors (TLRs) are crucial transmembrane pattern recognition receptors in innate immunity.
- Mammalian TLRs identify pathogen-associated molecular patterns, initiating immune signaling pathways.
Purpose of the Study:
- To investigate the evolutionary diversity of mammalian Toll-like receptor (TLR) genes.
- To understand the distinct evolutionary trajectory of TLR9 compared to other TLRs.
Main Methods:
- Reconstruction of ancestral sequences for mammalian TLR genes.
- Comprehensive analysis of sequence-based features (amino acid usage, hydrophobicity, GC content, evolutionary constraints).
Main Results:
- Mammalian TLR9 exhibits a distinct evolutionary pattern compared to other TLRs.
- Sequence features and evolutionary constraints significantly influence TLR9 divergence.
- Ancestral sequence reconstruction highlights gradual evolution leading to TLR9's unique pattern.
Conclusions:
- TLR9 has evolved distinctly within mammalian lineages.
- Accumulation of mutations over evolutionary time drives the divergence of TLR9.
- Understanding TLR evolution provides insights into innate immune system diversification.
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