APEX1(也称为APE1或Ref-1)是一种多功能基因,属于AP核酸内切酶家族,主要参与DNA损伤修复和氧化还原调控。其编码的蛋白质APEX1具有两种核心功能:一是作为DNA碱基切除修复(BER)途径中的关键酶,负责修复由氧化或烷化剂引起的DNA损伤,特别是切除无碱基位点(AP位点);二是作为氧化还原调控因子,通过调节转录因子(如NF-κB、HIF-1α等)的活性影响细胞应激反应、炎症和凋亡过程。APEX1的作用位点集中在细胞核内,但在某些条件下也会定位到线粒体,参与线粒体DNA的修复。突变或功能缺失可能导致基因组不稳定、加速衰老或增加癌症风险,例如某些遗传性BER缺陷与神经退行性疾病或肿瘤易感性相关。APEX1过表达常见于多种癌症(如乳腺癌、肺癌),与化疗耐药性和肿瘤进展相关,而敲低APEX1会导致细胞对氧化应激敏感并增强放疗/化疗效果。该基因家族(AP核酸内切酶家族)的共性包括保守的核酸酶结构域和参与DNA损伤修复的机制,但APEX1独特之处在于兼具修复与氧化还原调控的双重功能。此外,APEX1还通过调控血管生成因子(如VEGF)影响肿瘤微环境,其表达水平可能成为癌症预后标志物或治疗靶点。
Apurinic/apyrimidinic (AP) sites occur frequently in DNA molecules by spontaneous hydrolysis, by DNA damaging agents or by DNA glycosylases that remove specific abnormal bases. AP sites are pre-mutagenic lesions that can prevent normal DNA replication so the cell contains systems to identify and repair such sites. Class II AP endonucleases cleave the phosphodiester backbone 5' to the AP site. This gene encodes the major AP endonuclease in human cells. Splice variants have been found for this gene; all encode the same protein. [provided by RefSeq, Jul 2008]
经常发生在自发水解DNA分子嘌呤/嘧啶(AP)位点,通过DNA损伤剂或通过DNA糖基化酶的删除特定的异常基地。 AP位点是预先诱变病变,会影响正常的DNA复制使单元格中包含系统可以发现并修复这些网站。 II级的AP核酸内切酶切割磷酸二酯骨架的5‘到AP位点。该基因编码在人类细胞中的主要的AP核酸内切酶。剪接变异体已经发现了这种基因;都编码相同的蛋白质。 [由RefSeq的,2008年7月提供]
APEX1基因(以及对应的蛋白质)的细胞分布位置:
APEX1基因的本体(GO)信息:
| 名称 |
|---|
| 3410 Base excision repair [PATH:hsa03410] |
| 名称 |
|---|
| Abasic sugar-phosphate removal via the single-nucleotide replacement pathway |
| Base Excision Repair |
| Cell Cycle |
| Cell Cycle, Mitotic |
| Chromosome Maintenance |
| Displacement of DNA glycosylase by APEX1 |
| DNA Repair |
| DNA Replication |
| DNA strand elongation |
| Double-Strand Break Repair |
| Extension of Telomeres |
| Gap-filling DNA repair synthesis and ligation in GG-NER |
| Gap-filling DNA repair synthesis and ligation in TC-NER |
| Global Genomic NER (GG-NER) |
| Homologous Recombination Repair |
| Homologous recombination repair of replication-independent double-strand breaks |
| Lagging Strand Synthesis |
| Mismatch Repair |
| Mismatch repair (MMR) directed by MSH2:MSH3 (MutSbeta) |
| Mismatch repair (MMR) directed by MSH2:MSH6 (MutSalpha) |
| Nucleotide Excision Repair |
| PCNA-Dependent Long Patch Base Excision Repair |
| POLB-Dependent Long Patch Base Excision Repair |
| Processive synthesis on the C-strand of the telomere |
| Processive synthesis on the lagging strand |
| Resolution of Abasic Sites (AP sites) |
| Resolution of AP sites via the multiple-nucleotide patch replacement pathway |
| Resolution of AP sites via the single-nucleotide replacement pathway |
| Resolution of D-loop structures |
| Resolution of D-loop structures through Holliday junction intermediates |
| S Phase |
| Synthesis of DNA |
| Telomere C-strand (Lagging Strand) Synthesis |
| Telomere Maintenance |
| Transcription-coupled NER (TC-NER) |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Seizures | 0.2 | 2 | 0 | CTD_human_RGD |
| melanoma | 0.133907006 | 8 | 0 | BeFree_CTD_human_GAD_LHGDN |
| Stomach Neoplasms | 0.127101096 | 4 | 0 | CTD_human_GAD |
| Liver carcinoma | 0.124895885 | 8 | 0 | BeFree_CTD_human_LHGDN |
| Disease Progression | 0.12 | 1 | 0 | CTD_human |
| Micronuclei, Chromosome-Defective | 0.12 | 1 | 0 | CTD_human |
| Heart Diseases | 0.12 | 1 | 0 | CTD_human |
| Prostatic Neoplasms | 0.12 | 1 | 0 | CTD_human |
| Brain Ischemia | 0.08 | 1 | 0 | RGD |
| Lung diseases | 0.08 | 1 | 0 | RGD |
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