Evolutionary Origins of Toll-like Receptor Signaling

被引:169
作者
Brennan, Joseph J. [1 ]
Gilmore, Thomas D. [1 ]
机构
[1] Boston Univ, Dept Biol, Boston, MA 02115 USA
基金
美国国家科学基金会;
关键词
Toll-like receptors; evolution; innate immunity; development; NF-kappaB; NF-KAPPA-B; RICH REPEAT PROTEINS; INNATE IMMUNE DEFENSE; CAENORHABDITIS-ELEGANS; PATTERN-RECOGNITION; PATHOGEN RECOGNITION; ZHIKONG SCALLOP; DROSOPHILA; GENOME; PATHWAY;
D O I
10.1093/molbev/msy050
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Toll-like receptors (TLRs) are transmembrane pattern recognition receptors that are best known for their roles in innate immunity for the detection of and defense against microbial pathogens. However, TLRs also have roles in many non-immune processes, most notably development. TLRs direct both immune and developmental programs by activation of downstream signaling pathways, often by activation of the NF-kappa B pathway. There are two primary TLR subtypes: 1) TLRs with multiple cysteine clusters in their ectodomain (mccTLRs) and 2) TLRs with a single cysteine cluster in their ectodomain (sccTLRs). For some time, it has been known that TLRs and the biological processes that they control are conserved in organisms from insects to mammals. However, genome and transcriptome sequencing has revealed that many basal metazoans also have TLRs and downstream NF-kappa B signaling components. In this review, we discuss what is known about the structure, biological function, and downstream signaling pathways of TLRs found in phyla from Porifera through Annelida. From these analyses, we hypothesize that mccTLRs emerged in the phylum Cnidaria, that sccTLRs evolved in the phylum Mollusca, and that TLRs have dual immune and developmental biological functions in organisms as ancient as cnidarians.
引用
收藏
页码:1576 / 1587
页数:12
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