APP(淀粉样前体蛋白)基因位于人类第21号染色体上,属于APP基因家族,该家族还包括APLP1和APLP2基因。APP基因家族成员编码的蛋白质在结构上具有相似性,均含有跨膜结构域和多个保守的功能区域,主要参与细胞黏附、突触形成和神经发育等过程。APP基因编码的淀粉样前体蛋白是一种跨膜蛋白,广泛表达于多种组织中,尤其在神经元中高表达。其生物学功能包括参与细胞间相互作用、轴突生长、突触可塑性以及金属离子(如铜和锌)的转运。APP通过蛋白酶解加工产生多种片段,其中β-分泌酶和γ-分泌酶依次切割产生的Aβ肽段(特别是Aβ42)是阿尔茨海默病(AD)中淀粉样斑块的主要成分。APP基因突变(如瑞典突变、伦敦突变等)会导致Aβ产生增加或Aβ42/Aβ40比例升高,促进淀粉样斑块形成,与家族性阿尔茨海默病密切相关。此外,APP基因的拷贝数增加(如唐氏综合征患者因21号染色体三体导致APP过表达)也会显著增加AD风险。APP过表达会促进Aβ沉积、引发神经炎症和氧化应激,导致神经元损伤和认知功能下降;而APP表达降低可能影响突触功能和神经发育,但具体机制尚不完全清楚。除AD外,APP还与脑淀粉样血管病、唐氏综合征相关痴呆等疾病有关。APP基因家族成员(APLP1/2)虽不产生Aβ,但能部分补偿APP的功能缺失,表明它们在神经发育和稳态维持中具有重叠作用。研究APP及其加工途径对理解神经退行性疾病的机制和开发靶向治疗策略具有重要意义。
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APP基因(以及对应的蛋白质)的细胞分布位置:
APP基因的本体(GO)信息:
名称 |
---|
4726 Serotonergic synapse [PATH:hsa04726] |
5010 Alzheimer's disease [PATH:hsa05010] |
名称 |
---|
Activated TLR4 signalling |
Advanced glycosylation endproduct receptor signaling |
Amyloids |
Class A/1 (Rhodopsin-like receptors) |
Clathrin derived vesicle budding |
Cytosolic sensors of pathogen-associated DNA |
DEx/H-box helicases activate type I IFN and inflammatory cytokines production |
Disease |
Formyl peptide receptors bind formyl peptides and many other ligands |
G alpha (i) signalling events |
G alpha (q) signalling events |
Gastrin-CREB signalling pathway via PKC and MAPK |
GPCR downstream signaling |
GPCR ligand binding |
Hemostasis |
Immune System |
Inflammasomes |
Innate Immune System |
Lysosome Vesicle Biogenesis |
Membrane Trafficking |
MyD88 cascade initiated on plasma membrane |
MyD88 dependent cascade initiated on endosome |
MyD88-independent TLR3/TLR4 cascade |
MyD88:Mal cascade initiated on plasma membrane |
Nucleotide-binding domain, leucine rich repeat containing receptor (NLR) signaling pathways |
Peptide ligand-binding receptors |
Platelet activation, signaling and aggregation |
Platelet degranulation |
Response to elevated platelet cytosolic Ca2+ |
RIG-I/MDA5 mediated induction of IFN-alpha/beta pathways |
RIP-mediated NFkB activation via ZBP1 |
Signal Transduction |
Signaling by GPCR |
TAK1 activates NFkB by phosphorylation and activation of IKKs complex |
The NLRP3 inflammasome |
Toll Like Receptor 10 (TLR10) Cascade |
Toll Like Receptor 2 (TLR2) Cascade |
Toll Like Receptor 3 (TLR3) Cascade |
Toll Like Receptor 4 (TLR4) Cascade |
Toll Like Receptor 5 (TLR5) Cascade |
Toll Like Receptor 7/8 (TLR7/8) Cascade |
Toll Like Receptor 9 (TLR9) Cascade |
Toll Like Receptor TLR1:TLR2 Cascade |
Toll Like Receptor TLR6:TLR2 Cascade |
Toll-Like Receptors Cascades |
TRAF6 mediated induction of NFkB and MAP kinases upon TLR7/8 or 9 activation |
TRAF6 Mediated Induction of proinflammatory cytokines |
TRAF6 mediated NF-kB activation |
trans-Golgi Network Vesicle Budding |
TRIF-mediated TLR3/TLR4 signaling |
Vesicle-mediated transport |
ZBP1(DAI) mediated induction of type I IFNs |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Alzheimer's Disease | 0.600803935 | 269 | 6 | BeFree_CLINVAR_CTD_human_GAD_LHGDN_MGD_UNIPROT |
CEREBRAL AMYLOID ANGIOPATHY, APP-RELATED | 0.48 | 4 | 4 | CLINVAR_CTD_human_ORPHANET_UNIPROT |
Cerebral hemorrhage with amyloidosis, hereditary, Dutch type | 0.24 | 2 | 0 | CTD_human_ORPHANET |
Dementia | 0.150676439 | 33 | 2 | BeFree_CTD_human_GAD_LHGDN |
Down Syndrome | 0.146866321 | 27 | 0 | BeFree_CTD_human_GAD_LHGDN |
Cerebral Amyloid Angiopathy | 0.142870638 | 20 | 1 | BeFree_CTD_human_LHGDN |
Plaque, Amyloid | 0.141172466 | 79 | 2 | BeFree_CTD_human |
Amyloidosis | 0.134416214 | 27 | 0 | BeFree_CTD_human_LHGDN |
Neurodegenerative Disorders | 0.121628651 | 8 | 0 | BeFree_CTD_human |
Anxiety Disorders | 0.121357209 | 5 | 1 | BeFree_CTD_human |
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