ZFX (zinc finger protein X-linked)
- symbol:
- ZFX
- locus group:
- protein-coding gene
- location:
- Xp22.11
- gene_family:
- Zinc fingers, C2H2-type
- alias symbol:
- ZNF926
- alias name:
- None
- entrez id:
- 7543
- ensembl gene id:
- ENSG00000005889
- ucsc gene id:
- uc004dbd.3
- refseq accession:
- NM_003410
- hgnc_id:
- HGNC:12869
- approved reserved:
- 1988-07-06
ZFX（锌指X连锁蛋白，Zinc Finger X-linked protein）是一种位于X染色体上的锌指蛋白编码基因，属于锌指蛋白家族（Zinc Finger Protein Family）。锌指蛋白是一类通过锌离子稳定结构的DNA结合蛋白，其典型特征是含有重复的“锌指”结构域（由半胱氨酸和组氨酸残基与锌离子结合形成的指状三维结构），能够特异性识别并结合DNA序列，从而调控靶基因的转录。ZFX在进化上高度保守，与Y染色体上的同源基因ZFY（Zinc Finger Y-linked）具有相似功能。ZFX的主要生物学功能包括参与胚胎发育、干细胞自我更新及细胞增殖调控。其表达产物作为转录因子，通过结合特定DNA区域激活或抑制下游基因（如多能性相关基因OCT4、NANOG）的表达，尤其在维持胚胎干细胞（ES细胞）和多能性中起关键作用。ZFX的作用位点主要集中在细胞核内，通过调控细胞周期相关基因（如CCND1）影响细胞增殖。若ZFX发生功能丧失性突变（如无义突变或移码突变），可能导致胚胎发育异常或干细胞分化障碍；而某些错义突变可能改变其DNA结合能力，引发转录调控紊乱。研究发现ZFX与多种癌症（如白血病、肝癌）相关，其过表达可通过激活Wnt/β-catenin等促增殖信号通路加速肿瘤发生，还可能通过抑制凋亡基因（如BAX）促进细胞存活。相反，ZFX表达降低会导致干细胞多能性丧失和增殖减缓。在基因家族层面，锌指蛋白家族的共性是通过锌指结构域实现核酸结合或蛋白质互作，广泛参与转录调控、染色质重塑等过程。ZFX过表达会上调下游靶基因（如MYC）并增强干细胞特性，而敲低其表达则可能引发分化相关基因（如GATA4）的异常激活。需要注意的是，ZFX的X染色体定位使其在性别相关疾病中可能具有差异化影响，例如在X染色体失活逃逸（X-inactivation escape）情况下，女性细胞中可能出现双等位基因表达异常。
This gene on the X chromosome is structurally similar to a related gene on the Y chromosome. It encodes a member of the krueppel C2H2-type zinc-finger protein family. The full-length protein contains an acidic transcriptional activation domain (AD), a nuclear localization sequence (NLS) and a DNA binding domain (DBD) consisting of 13 C2H2-type zinc fingers. Studies in mouse embryonic and adult hematopoietic stem cells showed that this gene was required as a transcriptional regulator for self-renewal of both stem cell types, but it was dispensable for growth and differentiation of their progeny. Multiple alternatively spliced transcript variants encoding different isoforms have been identified, but the full-length nature of some variants has not been determined. [provided by RefSeq, May 2010]
Gene Ontology
Subcellular localization of ZFX (and its protein):
- plasma membrane
- cytoplasm
- extracellular
- golgi
- vesicle
- cytoskeleton
- endoplasmic reticulum
- nucleus
- endosome
- lysosome
- mitochondrion
Gene Ontology (GO) terms for ZFX:
| Interacting Gene | Interaction | Source/Score |
| Disease | Score | NofPmids | NofSnps | Source |
| Carcinogenesis | 0.001085767 | 4 | 0 | BeFree |
| Malignant neoplasm of stomach | 0.000814326 | 3 | 0 | BeFree |
| Glioma | 0.000814326 | 3 | 0 | BeFree |
| Stomach Carcinoma | 0.000814326 | 3 | 0 | BeFree |
| Non-Small Cell Lung Carcinoma | 0.000814326 | 3 | 0 | BeFree |
| Secondary malignant neoplasm of lymph node | 0.000542884 | 2 | 0 | BeFree |
| Laryngeal Squamous Cell Carcinoma | 0.000542884 | 2 | 0 | BeFree |
| Malignant neoplasm of gallbladder | 0.000542884 | 2 | 0 | BeFree |
| Squamous cell carcinoma of tongue | 0.000542884 | 2 | 0 | BeFree |
| Gallbladder Carcinoma | 0.000542884 | 2 | 0 | BeFree |
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