RAP1A(Ras-related protein Rap-1A)属于Ras超家族中的RAP亚家族,该家族还包括RAP1B、RAP2A、RAP2B等成员。Ras超家族基因的共同特点是编码小GTP酶,这些蛋白通过结合GTP(激活态)或GDP(失活态)来调节细胞信号传导,参与细胞增殖、分化、黏附及迁移等过程。RAP1A在多种组织中表达,尤其在血小板、免疫细胞和神经元中丰度较高。其功能主要依赖于GTP/GDP循环,通过激活下游效应蛋白(如MAPK、PI3K通路)调控细胞黏附、细胞连接和细胞极性。RAP1A在整合素介导的细胞-基质黏附中起关键作用,影响免疫细胞的迁移和炎症反应。此外,它还与血管生成和突触可塑性相关。突变或表达异常可能导致功能紊乱,例如RAP1A功能丧失性突变与某些免疫缺陷和血小板功能障碍有关,而过表达则可能促进肿瘤细胞的侵袭和转移,因其增强整合素信号和细胞运动性。在癌症中,RAP1A的异常激活与乳腺癌、结肠癌等进展相关。RAP1A还通过调控VE-钙黏蛋白影响血管内皮屏障功能,其表达降低可能导致血管通透性增加。在神经系统,RAP1A参与神经元突触的形成和维持,表达异常可能与神经退行性疾病有关。RAP家族成员的共性包括高度保守的GTP结合域、相似的效应蛋白识别机制,以及参与细胞骨架重组和膜运输调控。RAP1A与RAP1B功能部分冗余,但组织分布和调控途径存在差异。例如,RAP1B在血小板活化中更关键,而RAP1A对神经元功能影响更显著。研究还发现,RAP1A可通过交叉对话抑制Ras蛋白的活性,从而平衡生长信号。其表达受转录因子(如SP1)和表观遗传修饰调控,miR-30家族等非编码RNA也可靶向抑制RAP1A翻译。总之,RAP1A作为细胞信号网络的关键节点,其功能精细调控对维持组织稳态至关重要,而失调可能导致多种病理状态。
This gene encodes a member of the Ras family of small GTPases. The encoded protein undergoes a change in conformational state and activity, depending on whether it is bound to GTP or GDP. This protein is activated by several types of guanine nucleotide exchange factors (GEFs), and inactivated by two groups of GTPase-activating proteins (GAPs). The activation status of the encoded protein is therefore affected by the balance of intracellular levels of GEFs and GAPs. The encoded protein regulates signaling pathways that affect cell proliferation and adhesion, and may play a role in tumor malignancy. Pseudogenes of this gene have been defined on chromosomes 14 and 17. Alternative splicing results in multiple transcript variants. [provided by RefSeq, May 2014]
该基因编码的Ras家族小GTP酶中的一员。该编码的蛋白经受??构象状态和活性的改变,这取决于它是否绑定GTP或国内生产总值。这种蛋白是由几种类型的鸟嘌呤核苷酸交换因子(环基金)激活,并通过两组GTP酶激活蛋白(GAP)的失活。因此所编码的蛋白质的活化状态是受环基金和GAP的细胞内水平的平衡。所编码的蛋白质调节的信号影响细胞增殖和粘附,并可能在肿瘤恶性作用途径。这个基因的假基因已在染色体14,并在多个转录变异体17选择性剪接的结果来定义。 [由RefSeq的,2014年5月提供]
RAP1A基因(以及对应的蛋白质)的细胞分布位置:
RAP1A基因的本体(GO)信息:
| 名称 |
|---|
| 4014 Ras signaling pathway [PATH:hsa04014] |
| 4015 Rap1 signaling pathway [PATH:hsa04015] |
| 4010 MAPK signaling pathway [PATH:hsa04010] |
| 4024 cAMP signaling pathway [PATH:hsa04024] |
| 4510 Focal adhesion [PATH:hsa04510] |
| 4611 Platelet activation [PATH:hsa04611] |
| 4670 Leukocyte transendothelial migration [PATH:hsa04670] |
| 4062 Chemokine signaling pathway [PATH:hsa04062] |
| 4972 Pancreatic secretion [PATH:hsa04972] |
| 4720 Long-term potentiation [PATH:hsa04720] |
| 4722 Neurotrophin signaling pathway [PATH:hsa04722] |
| 5211 Renal cell carcinoma [PATH:hsa05211] |
| 名称 |
|---|
| Adaptive Immune System |
| ARMS-mediated activation |
| Frs2-mediated activation |
| Glucagon-like Peptide-1 (GLP1) regulates insulin secretion |
| GRB2:SOS provides linkage to MAPK signaling for Integrins |
| Hemostasis |
| Immune System |
| Integration of energy metabolism |
| Integrin alphaIIb beta3 signaling |
| NGF signalling via TRKA from the plasma membrane |
| p130Cas linkage to MAPK signaling for integrins |
| Platelet activation, signaling and aggregation |
| Platelet Aggregation (Plug Formation) |
| Prolonged ERK activation events |
| Rap1 signalling |
| Regulation of insulin secretion |
| Signalling by NGF |
| Signalling to ERKs |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Osteoporosis | 0.122638474 | 1 | 1 | BeFree_GAD_GWASCAT |
| Myocardial Reperfusion Injury | 0.08 | 1 | 0 | RGD |
| Hyperoxaluria | 0.08 | 1 | 0 | RGD |
| Squamous cell carcinoma | 0.003538676 | 3 | 0 | BeFree_LHGDN |
| Leukocyte-Adhesion Deficiency Syndrome | 0.002995792 | 1 | 0 | BeFree_LHGDN |
| MYELODYSPLASTIC SYNDROME | 0.00272435 | 1 | 0 | LHGDN |
| Thyroid Neoplasm | 0.002638474 | 2 | 0 | BeFree_GAD |
| Systemic arterial pressure | 0.002367032 | 1 | 1 | GAD |
| Carcinoma, Papillary | 0.002367032 | 1 | 0 | GAD |
| Blood pressure finding | 0.002367032 | 1 | 1 | GAD |
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