XRCC4(X-ray repair cross-complementing protein 4)是一种参与DNA双链断裂修复的关键基因,属于非同源末端连接(NHEJ, Non-homologous end joining)修复通路的核心成员。它的主要功能是与DNA连接酶4(LIG4)形成稳定复合物,促进断裂DNA末端的连接,从而维持基因组稳定性。XRCC4在细胞核中发挥作用,尤其在快速分裂的细胞(如淋巴细胞)中表达较高。若XRCC4发生功能丧失性突变,会导致NHEJ修复缺陷,引发基因组不稳定、细胞凋亡增加,甚至与免疫缺陷、辐射敏感性增高及癌症易感性相关(如淋巴瘤)。该基因属于XRCC基因家族,该家族成员均参与DNA损伤修复,但XRCC4特异性调控NHEJ通路。当XRCC4过表达时,可能增强DNA修复能力但潜在导致修复错误积累;而表达降低则使细胞对电离辐射和化疗药物敏感,同时增加染色体畸变风险。在疾病方面,XRCC4突变与遗传性疾病如LIG4综合征(表现为发育迟缓、免疫缺陷)密切相关,其单核苷酸多态性(SNPs)也被研究于癌症个体化治疗反应预测。专业术语中,NHEJ指细胞在无模板情况下直接连接DNA断裂末端的修复机制,而SNPs是基因组中单个碱基的变异位点。目前中文术语"非同源末端连接"和"单核苷酸多态性"已广泛使用且翻译准确。
The protein encoded by this gene functions together with DNA ligase IV and the DNA-dependent protein kinase in the repair of DNA double-strand break by non-homologous end joining and the completion of V(D)J recombination events. The non-homologous end-joining pathway is required both for normal development and for suppression of tumors. This gene functionally complements XR-1 Chinese hamster ovary cell mutant, which is impaired in DNA double-strand breaks produced by ionizing radiation and restriction enzymes. Alternative transcription initiation and alternative splicing generates several transcript variants. [provided by RefSeq, Sep 2008]
由该基因的功能进行编码用DNA连接酶IV和通过非同源末端连接在DNA双链断裂的修复的DNA依赖性蛋白激酶和的V(D)完成J重组事件一起的蛋白质。的非同源末端连接途径既用于正常发育和肿瘤的抑制必需的。该基因功能的补充XR-1的中国仓鼠卵巢细胞的突变体,它是在由电离辐射和限制性内切酶产生的DNA双链断裂削弱。替代转录起始和剪接产生几种抄本变形。 [由RefSeq的,2008年9月提供]
XRCC4基因(以及对应的蛋白质)的细胞分布位置:
XRCC4基因的本体(GO)信息:
名称 |
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3450 Non-homologous end-joining [PATH:hsa03450] |
名称 |
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2-LTR circle formation |
Disease |
DNA Repair |
Double-Strand Break Repair |
Early Phase of HIV Life Cycle |
HIV Infection |
HIV Life Cycle |
Infectious disease |
Integration of provirus |
Metabolism of proteins |
Nonhomologous End-joining (NHEJ) |
Post-translational protein modification |
SUMO E3 ligases SUMOylate target proteins |
SUMOylation |
SUMOylation of DNA damage response and repair proteins |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
PITUITARY DWARFISM I | 0.120542884 | 2 | 1 | BeFree_CLINVAR |
Hypertensive disease | 0.12 | 1 | 2 | GWASCAT |
Chromosome Aberrations | 0.12 | 1 | 0 | CTD_human |
Malignant neoplasm of breast | 0.016916611 | 12 | 2 | BeFree_GAD |
Mouth Neoplasms | 0.014916828 | 4 | 0 | GAD_LHGDN |
Malignant neoplasm of urinary bladder | 0.012649486 | 6 | 0 | BeFree_GAD |
Malignant neoplasm of lung | 0.010011012 | 5 | 0 | BeFree_GAD |
Glioma | 0.007915422 | 5 | 2 | BeFree_GAD |
Stomach Neoplasms | 0.007458414 | 3 | 0 | GAD_LHGDN |
Brain Neoplasms | 0.007101096 | 3 | 0 | GAD |
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