KCNJ9(钾电压门控通道亚家族J成员9)属于内向整流钾通道(Kir)基因家族,该家族以调控细胞膜电位和钾离子流动为共性,参与维持静息膜电位、电信号传导及电解质平衡。KCNJ9编码Kir3.3蛋白,与Kir3亚家族其他成员(如Kir3.1/3.2/3.4)共同形成G蛋白偶联内向整流钾通道(GIRK),其活性受神经递质(如乙酰胆碱、多巴胺)通过GPCR途径调控,主要在心脑组织中抑制神经元兴奋性和调节心率。KCNJ9在中枢神经系统(如海马、丘脑)和心脏窦房结中表达,通过超极化细胞膜降低动作电位频率,影响神经递质释放及心脏节律。突变可能导致通道功能丧失或增强,例如功能丧失性突变与癫痫、精神分裂症等神经系统疾病相关,而功能获得性突变可能引发心律失常。KCNJ9过表达会增强GIRK电流,导致神经元活动过度抑制(如认知障碍)或心动过缓;表达降低则可能引发神经元过度兴奋(如癫痫发作)或心动过速。该基因与Kir3家族成员(如KCNJ3/KCNJ6)存在功能冗余,但Kir3.3的组织分布和调控特性具有独特性。研究还发现KCNJ9与药物成瘾相关,因GIRK通道是阿片类及酒精的作用靶点之一。
Potassium channels are present in most mammalian cells, where they participate in a wide range of physiologic responses. The protein encoded by this gene is an integral membrane protein and inward-rectifier type potassium channel. The encoded protein, which has a greater tendency to allow potassium to flow into a cell rather than out of a cell, is controlled by G-proteins. It associates with another G-protein-activated potassium channel to form a heteromultimeric pore-forming complex. [provided by RefSeq, Jul 2008]
钾通道存在于大多数哺乳动物细胞,在那里他们参与广泛的生理反应。由该基因编码的蛋白质是一种完整的膜蛋白和向内整流型钾通道。所编码的蛋白质,其具有更大的趋势,以允许钾流入细胞而不是出于细胞的,是由G蛋白控制。它与另一种G蛋白活化的钾通道相关联,以形成异源多孔隙形成复合物。 [由RefSeq的,2008年7月提供]
KCNJ9基因(以及对应的蛋白质)的细胞分布位置:
KCNJ9基因的本体(GO)信息:
名称 |
---|
4915 Estrogen signaling pathway [PATH:hsa04915] |
4921 Oxytocin signaling pathway [PATH:hsa04921] |
4728 Dopaminergic synapse [PATH:hsa04728] |
4726 Serotonergic synapse [PATH:hsa04726] |
4723 Retrograde endocannabinoid signaling [PATH:hsa04723] |
4713 Circadian entrainment [PATH:hsa04713] |
5032 Morphine addiction [PATH:hsa05032] |
名称 |
---|
Activation of G protein gated Potassium channels |
Activation of GABAB receptors |
G protein gated Potassium channels |
GABA B receptor activation |
GABA receptor activation |
Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits |
Inwardly rectifying K+ channels |
Neuronal System |
Neurotransmitter Receptor Binding And Downstream Transmission In The Postsynaptic Cell |
Potassium Channels |
Transmission across Chemical Synapses |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Diabetes Mellitus, Non-Insulin-Dependent | 0.003181358 | 3 | 0 | BeFree_GAD |
Lung Neoplasms | 0.00272435 | 1 | 0 | LHGDN |
Migraine with Aura | 0.002367032 | 1 | 0 | GAD |
Epilepsy | 0.002367032 | 1 | 0 | GAD |
Barbiturate withdrawal | 0.000271442 | 1 | 0 | BeFree |
Diabetes | 0.000271442 | 1 | 0 | BeFree |
Diabetes Mellitus | 0.000271442 | 1 | 0 | BeFree |
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