CYBA(Cytochrome b-245 alpha chain)基因编码NADPH氧化酶复合物的一个关键亚基,主要参与活性氧(ROS)的生成。该基因位于16号染色体上,属于CYBA/CYBB基因家族,该家族成员共同特点是编码NADPH氧化酶的不同亚基,负责电子传递和超氧化物产生。CYBA基因产物p22phox与gp91phox(由CYBB编码)形成异源二聚体,构成细胞膜上的NADPH氧化酶核心催化单元(称为NOX2),在吞噬细胞中尤其重要,通过产生超氧化物来杀灭病原体。该基因突变会导致慢性肉芽肿病(CGD),这是一种免疫缺陷病,患者因无法有效产生ROS而反复感染。突变类型包括错义突变、无义突变和剪接位点突变,均可破坏NADPH氧化酶功能。CYBA表达异常还与心血管疾病相关,其过表达可能增加氧化应激导致动脉粥样硬化,而表达降低则削弱免疫防御。该基因还影响其他NOX家族成员(如NOX1、NOX3-5)的稳定性,因为p22phox是这些同源物的共同伴侣蛋白。研究表明CYBA多态性与高血压、糖尿病并发症等疾病易感性相关。在非吞噬细胞中,CYBA通过调节ROS水平参与信号转导、细胞增殖和凋亡。基因家族成员均含有跨膜结构域和血红素结合位点,但组织分布和调控机制存在差异。CYBA的表达受缺氧、炎症因子等环境因素调控,其功能紊乱可能通过影响氧化还原平衡参与肿瘤发生发展。
Cytochrome b is comprised of a light chain (alpha) and a heavy chain (beta). This gene encodes the light, alpha subunit which has been proposed as a primary component of the microbicidal oxidase system of phagocytes. Mutations in this gene are associated with autosomal recessive chronic granulomatous disease (CGD), that is characterized by the failure of activated phagocytes to generate superoxide, which is important for the microbicidal activity of these cells. [provided by RefSeq, Jul 2008]
细胞色素b由轻链(阿尔法)和重链(测试版)。该基因编码已被提议作为吞噬细胞的杀微生物氧化酶系统的主分量的光,α亚基。在这种基因突变与常染色体隐性慢性肉芽肿病(CGD),其特征是激活的吞噬细胞未能产生超氧化物,它是这些细胞的杀微生物活性是重要的关联。 [由RefSeq的,2008年7月提供]
CYBA基因(以及对应的蛋白质)的细胞分布位置:
CYBA基因的本体(GO)信息:
名称 |
---|
4145 Phagosome [PATH:hsa04145] |
4670 Leukocyte transendothelial migration [PATH:hsa04670] |
4380 Osteoclast differentiation [PATH:hsa04380] |
5140 Leishmaniasis [PATH:hsa05140] |
名称 |
---|
Adaptive Immune System |
Antigen processing-Cross presentation |
Class I MHC mediated antigen processing & presentation |
Cross-presentation of particulate exogenous antigens (phagosomes) |
Disease |
Immune System |
Infectious disease |
Latent infection of Homo sapiens with Mycobacterium tuberculosis |
Phagosomal maturation (early endosomal stage) |
RHO GTPase Effectors |
RHO GTPases Activate NADPH Oxidases |
Signal Transduction |
Signaling by Rho GTPases |
Signaling by VEGF |
VEGFA-VEGFR2 Pathway |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Granulomatous Disease, Chronic, Autosomal Recessive, Cytochrome B-Negative | 0.36 | 5 | 12 | CLINVAR_CTD_human_UNIPROT |
Hypertensive disease | 0.24827923 | 28 | 1 | BeFree_CTD_human_GAD_LHGDN_RGD |
Chronic granulomatous disease | 0.247338862 | 18 | 0 | BeFree_CTD_human_LHGDN_ORPHANET |
Kidney Failure, Chronic | 0.208001298 | 4 | 0 | BeFree_CTD_human_GAD_LHGDN_RGD |
Diabetes Mellitus, Experimental | 0.2 | 3 | 0 | CTD_human_RGD |
Atherosclerosis | 0.145089661 | 17 | 1 | BeFree_CTD_human_GAD_LHGDN |
Diabetes Mellitus, Non-Insulin-Dependent | 0.134549579 | 15 | 1 | BeFree_CTD_human_GAD |
Heart Diseases | 0.122367032 | 2 | 0 | CTD_human_GAD |
Myocardial Infarction | 0.08554839 | 6 | 1 | BeFree_GAD_RGD |
Metabolic Syndrome X | 0.080271442 | 2 | 1 | BeFree_RGD |
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