RASGRP4(RAS Guanyl Releasing Protein 4)属于RASGRP基因家族,该家族成员均为鸟苷酸交换因子(GEFs),能够激活RAS家族的小GTP酶,从而调控细胞信号传导通路,尤其是MAPK/ERK通路,影响细胞增殖、分化和存活。RASGRP4主要在肥大细胞中高表达,对肥大细胞的发育、活化和功能至关重要。其表达产物通过调节RAS的活性,参与免疫应答和炎症反应。该基因的突变可能导致肥大细胞功能异常,与某些过敏性疾病(如哮喘、特应性皮炎)及肥大细胞增多症相关。若RASGRP4过表达,可能增强肥大细胞的活化和脱颗粒,加剧过敏或炎症反应;而降低表达则可能削弱肥大细胞功能,影响免疫防御或导致免疫失调。RASGRP基因家族的共性在于均含有REM(RAS Exchange Motif)和CDC25结构域,前者稳定蛋白构象,后者直接催化RAS的GDP/GTP交换。研究还发现RASGRP4在某些白血病中异常表达,提示其可能参与肿瘤发生。此外,该基因与自身免疫疾病的关联也被逐步揭示,但具体机制仍需进一步探索。
The protein encoded by this gene is a member of the Ras guanyl nucleotide-releasing protein (RasGRP) family of Ras guanine nucleotide exchange factors. It contains a Ras exchange motif, a diacylglycerol-binding domain, and two calcium-binding EF hands. This protein was shown to activate H-Ras in a cation-dependent manner in vitro. Expression of this protein in myeloid cell lines was found to be correlated with elevated level of activated RAS protein, and the RAS activation can be greatly enhanced by phorbol ester treatment, which suggested a role of this protein in diacylglycerol regulated cell signaling pathways. Studies of a mast cell leukemia cell line expressing substantial amounts of abnormal transcripts of this gene indicated that this gene may play an important role in the final stages of mast cell development. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2009]
由该基因编码的蛋白质是RAS脒核苷酸释放蛋白(RasGRP)家族的Ras鸟嘌呤核苷酸交换因子的成员。它含有的Ras交换基序,二酰基甘油结合结构域和两个钙结合EF手。这种蛋白质被证明激活的H-的Ras在体外的阳离子依赖性。被发现在骨髓细胞系该蛋白质的表达,以与水平升高活化的RAS蛋白相关,和RAS活化可通过佛波酯处理,这表明该蛋白在二酰基甘油调节细胞信号传导途径作用大大增强。表达大量本基因的异常转录的肥大细胞白血病细胞系的研究表明,该基因可在肥大细胞发育的最后阶段发挥重要作用。已发现该基因编码不同亚型的多个抄本变形。 [由RefSeq的,2009年4月提供]
RASGRP4基因(以及对应的蛋白质)的细胞分布位置:
RASGRP4基因的本体(GO)信息:
名称 |
---|
4014 Ras signaling pathway [PATH:hsa04014] |
4010 MAPK signaling pathway [PATH:hsa04010] |
5200 Pathways in cancer [PATH:hsa05200] |
名称 |
---|
Fc epsilon receptor (FCERI) signaling |
FCERI mediated NF-kB activation |
Immune System |
Innate Immune System |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Asthma | 0.002995792 | 2 | 0 | BeFree_LHGDN |
Mastocytosis | 0.00272435 | 1 | 0 | LHGDN |
Leukemia, Mast-Cell | 0.00272435 | 1 | 0 | LHGDN |
Asperger Syndrome | 0.002367032 | 1 | 1 | GAD |
Leukemogenesis | 0.000542884 | 2 | 0 | BeFree |
Leukemia, Myelocytic, Acute | 0.000542884 | 2 | 0 | BeFree |
Precursor T-Cell Lymphoblastic Leukemia-Lymphoma | 0.000271442 | 1 | 0 | BeFree |
山东省济南市章丘区文博路2号 齐鲁师范学院 genelibs生信实验室
山东省济南市高新区舜华路750号大学科技园北区F座4单元2楼
电话: 0531-88819269
E-mail: product@genelibs.com
关注微信订阅号,实时查看信息,关注医学生物学动态。