TDP1(Tyrosyl-DNA phosphodiesterase 1)是一种关键的DNA修复酶,主要功能是修复DNA拓扑异构酶I(Top1)在DNA复制或转录过程中产生的损伤。当Top1切割DNA链形成短暂的3'-磷酸酪氨酸键时,如果这一中间体未能正常连接,会导致DNA断裂。TDP1通过水解3'-磷酸酪氨酸键,将其转化为3'-磷酸末端,从而修复DNA损伤,确保基因组稳定性。TDP1在神经元中表达较高,对维持神经细胞的DNA完整性尤为重要。TDP1属于磷酸二酯酶超家族,该家族成员通常参与核酸代谢,能够水解磷酸二酯键以修复DNA或RNA损伤。TDP1基因突变会导致一种罕见的常染色体隐性遗传病——脊髓小脑共济失调伴轴突神经病变(SCAN1),患者表现为进行性神经退行性变,如共济失调、周围神经病变等,这是由于突变的TDP1无法有效修复Top1介导的DNA损伤,导致神经元凋亡。此外,TDP1功能异常还与癌症相关,某些肿瘤细胞依赖TDP1修复Top1抑制剂(如伊立替康)引起的DNA损伤,因此抑制TDP1可增强化疗效果。TDP1过表达可能增强细胞对DNA损伤的修复能力,降低化疗药物敏感性,而降低表达或功能缺失则会导致DNA损伤积累,引发神经退行性疾病或增加细胞对Top1抑制剂的敏感性。TDP1与PARP1、XRCC1等修复蛋白相互作用,共同参与DNA单链断裂修复通路。该基因的调控异常可能影响整个修复网络的平衡,进而影响细胞存活或疾病进展。
The protein encoded by this gene is involved in repairing stalled topoisomerase I-DNA complexes by catalyzing the hydrolysis of the phosphodiester bond between the tyrosine residue of topoisomerase I and the 3-prime phosphate of DNA. This protein may also remove glycolate from single-stranded DNA containing 3-prime phosphoglycolate, suggesting a role in repair of free-radical mediated DNA double-strand breaks. This gene is a member of the phospholipase D family and contains two PLD phosphodiesterase domains. Mutations in this gene are associated with the disease spinocerebellar ataxia with axonal neuropathy (SCAN1). While several transcript variants may exist for this gene, the full-length natures of only two have been described to date. These two represent the major variants of this gene and encode the same isoform. [provided by RefSeq, Jul 2008]
由该基因编码的蛋白参与通过催化拓扑异构酶I的酪氨酸残基与DNA的3贷磷酸盐之间的磷酸二酯键的水解修复停滞拓扑异构酶Ⅰ-DNA复合物。这种蛋白也可以由含有3-素磷酸乙醇酸单链DNA除去甘醇酸,暗示在自由基介导的DNA双链断裂修复的作用。此基因是磷脂酶D家族的成员,并含有两个PLD磷酸域。在这个基因的突变与轴突神经病(SCAN1)疾病脊髓小脑性共济失调相关联。而几个转录变异体可能存在于该基因,只有两个全长性质已经描述到日期。这两个代表该基因的主要变体和编码相同同种型。 [由RefSeq的,2008年7月提供]
TDP1基因(以及对应的蛋白质)的细胞分布位置:
TDP1基因的本体(GO)信息:
名称 |
---|
DNA Repair |
Double-Strand Break Repair |
Nonhomologous End-joining (NHEJ) |
Processing of DNA ends prior to end rejoining |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
SPINOCEREBELLAR ATAXIA, AUTOSOMAL RECESSIVE, WITH AXONAL NEUROPATHY | 0.56 | 1 | 1 | CLINVAR_CTD_human_MGD_ORPHANET_UNIPROT |
Ataxia, Spinocerebellar | 0.010887469 | 10 | 1 | BeFree_LHGDN |
Colorectal Neoplasms | 0.002367032 | 1 | 0 | GAD |
Axonal neuropathy | 0.001900093 | 7 | 1 | BeFree |
Neurodegenerative Disorders | 0.001357209 | 5 | 1 | BeFree |
Leukopenia | 0.000542884 | 2 | 0 | BeFree |
Malignant neoplasm of lung | 0.000542884 | 2 | 0 | BeFree |
Carcinoma of lung | 0.000542884 | 2 | 0 | BeFree |
Neutropenia | 0.000542884 | 2 | 0 | BeFree |
Breast Carcinoma | 0.000271442 | 1 | 0 | BeFree |
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