TLR3(Toll样受体3,Toll-like receptor 3)属于Toll样受体(TLR)家族,该家族是一类模式识别受体(PRR),主要识别病原体相关分子模式(PAMP),如病毒双链RNA(dsRNA),在先天免疫应答中起关键作用。TLR3主要表达于免疫细胞(如树突状细胞、巨噬细胞)及上皮细胞内,其功能是通过识别病毒dsRNA激活下游信号通路(如TRIF依赖途径),诱导I型干扰素(IFN-α/β)和促炎细胞因子(如IL-6、TNF-α)的产生,从而启动抗病毒免疫反应。TLR3的突变可能导致功能丧失,增加对疱疹病毒等感染的易感性,或引发自身炎症性疾病;某些突变(如P554S)与儿童单纯疱疹病毒性脑炎(HSE)的遗传易感性相关。TLR3过表达可能增强抗病毒反应,但过度激活会引发细胞因子风暴(如COVID-19重症中的免疫病理损伤);而表达降低则可能导致免疫逃逸或慢性感染。TLR家族(TLR1-13)的共同特点是具有富含亮氨酸重复序列(LRR)的胞外域和TIR(Toll/IL-1受体同源)胞内域,通过识别不同病原体成分(如细菌脂多糖、病毒核酸)协调免疫防御。TLR3的独特之处在于其依赖内体(endosome)定位及特异性识别dsRNA,与其他TLR(如TLR4识别LPS)形成互补。
The protein encoded by this gene is a member of the Toll-like receptor (TLR) family which plays a fundamental role in pathogen recognition and activation of innate immunity. TLRs are highly conserved from Drosophila to humans and share structural and functional similarities. They recognize pathogen-associated molecular patterns (PAMPs) that are expressed on infectious agents, and mediate the production of cytokines necessary for the development of effective immunity. The various TLRs exhibit different patterns of expression. This receptor is most abundantly expressed in placenta and pancreas, and is restricted to the dendritic subpopulation of the leukocytes. It recognizes dsRNA associated with viral infection, and induces the activation of NF-kappaB and the production of type I interferons. It may thus play a role in host defense against viruses. Use of alternative polyadenylation sites to generate different length transcripts has been noted for this gene. [provided by RefSeq, Jul 2008]
由该基因编码的蛋白是Toll样受体(TLR)家族中起着病原体识别和先天免疫激活的基础性作用的成员。 Toll样受体是高度果蝇保守到人类和共享结构和功能的相似性。他们认识到是在感染剂表达的病原体相关分子模式(PAMP),并介导的生产所必需的有效免疫的发展细胞因子。各种Toll样受体表现出不同的表达模式。此受体在胎盘和胰腺最大量表达,并且被限制在白细胞的树突状细胞亚群。它识别双链RNA与病毒感染有关,并诱导的NF-κB的活化和生产I型干扰素。因此,它可以起到对病毒宿主防御的作用。替代多聚腺苷酸化位点用来生成不同长度的成绩单已经注意到了这个基因。 [由RefSeq的,2008年7月提供]
TLR3基因(以及对应的蛋白质)的细胞分布位置:
TLR3基因的本体(GO)信息:
| 名称 |
|---|
| 4620 Toll-like receptor signaling pathway [PATH:hsa04620] |
| 5164 Influenza A [PATH:hsa05164] |
| 5161 Hepatitis B [PATH:hsa05161] |
| 5160 Hepatitis C [PATH:hsa05160] |
| 5168 Herpes simplex infection [PATH:hsa05168] |
| 名称 |
|---|
| Activated TLR4 signalling |
| Activation of IRF3/IRF7 mediated by TBK1/IKK epsilon |
| Apoptosis |
| Caspase activation via extrinsic apoptotic signalig pathway |
| Cytosolic sensors of pathogen-associated DNA |
| Disease |
| Diseases associated with the TLR signaling cascade |
| Diseases of Immune System |
| IKK complex recruitment mediated by RIP1 |
| Innate Immune System |
| Ligand-dependent caspase activation |
| MyD88-independent TLR3/TLR4 cascade |
| Programmed Cell Death |
| RIP-mediated NFkB activation via ZBP1 |
| TICAM1 deficiency - HSE |
| TLR3 deficiency - HSE |
| Toll Like Receptor 3 (TLR3) Cascade |
| Toll Like Receptor 4 (TLR4) Cascade |
| Toll-Like Receptors Cascades |
| TRAF3 deficiency - HSE |
| TRAF6 mediated induction of TAK1 complex |
| Trafficking and processing of endosomal TLR |
| TRIF-mediated programmed cell death |
| TRIF-mediated TLR3/TLR4 signaling |
| UNC93B1 deficiency - HSE |
| ZBP1(DAI) mediated induction of type I IFNs |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| HERPES SIMPLEX ENCEPHALITIS, SUSCEPTIBILITY TO, 2 | 0.24 | 1 | 1 | CLINVAR_UNIPROT |
| Herpes encephalitis | 0.123528744 | 13 | 0 | BeFree_CTD_human |
| Macular Degeneration, Age-Related, 1 | 0.12 | 0 | 0 | CTD_human |
| Asthma | 0.083181358 | 5 | 0 | BeFree_GAD_RGD |
| Pre-Eclampsia | 0.082367032 | 2 | 0 | GAD_RGD |
| Pancreatitis | 0.080271442 | 2 | 1 | BeFree_RGD |
| Somatosensory Disorders | 0.08 | 1 | 0 | RGD |
| Necrotizing Enterocolitis | 0.08 | 1 | 0 | RGD |
| Reperfusion Injury | 0.08 | 1 | 0 | RGD |
| Colitis | 0.08 | 1 | 0 | RGD |
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