HMGA2(High Mobility Group AT-hook 2)是一种非组蛋白染色质结合蛋白,属于高迁移率族蛋白(HMGA)基因家族。该家族成员(包括HMGA1和HMGA2)的共同特点是含有多个AT-hook结构域,这些结构域能特异性结合富含AT碱基对的DNA小沟,从而调节染色质结构和基因表达。HMGA蛋白不直接激活或抑制转录,而是通过改变DNA构象或作为"转录增强子"与其他转录因子相互作用来调控基因表达。HMGA2在胚胎发育中起关键作用,特别是在脂肪组织形成、身高发育和大脑发育过程中。该基因的主要作用位点包括间充质干细胞和多种前体细胞。HMGA2突变或表达异常与多种疾病相关,例如12号染色体上的HMGA2重排会导致脂肪瘤,而某些点突变与身高异常(如巨人症或矮小症)相关。HMGA2过表达常见于多种恶性肿瘤(如肺癌、乳腺癌、胰腺癌等),通过促进上皮-间质转化(EMT)和干细胞特性来驱动肿瘤侵袭和转移。相反,HMGA2表达降低会导致生长迟缓和脂肪代谢异常。在分子水平上,HMGA2通过调控细胞周期蛋白(如Cyclin A和Cyclin E)和抑制Rb蛋白来促进细胞增殖。此外,HMGA2还参与调控let-7 microRNA家族,形成双向调控网络:HMGA2是let-7的靶基因,而let-7又能抑制HMGA2表达。这种调控关系在干细胞维持和肿瘤发生中尤为重要。HMGA2还与Wnt/β-catenin和TGF-β信号通路相互作用,影响细胞命运决定。在临床方面,HMGA2表达水平可作为某些癌症的预后标志物,其过表达通常预示不良预后。值得注意的是,HMGA2在成人正常组织中表达很低,但在多种肿瘤中重新激活,这使其成为潜在的抗癌治疗靶点。
This gene encodes a protein that belongs to the non-histone chromosomal high mobility group (HMG) protein family. HMG proteins function as architectural factors and are essential components of the enhancesome. This protein contains structural DNA-binding domains and may act as a transcriptional regulating factor. Identification of the deletion, amplification, and rearrangement of this gene that are associated with myxoid liposarcoma suggests a role in adipogenesis and mesenchymal differentiation. A gene knock out study of the mouse counterpart demonstrated that this gene is involved in diet-induced obesity. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]
这个基因编码属于非组蛋白染色体高迁移率组(HMG)蛋白家族的蛋白。 HMG蛋白质充当建筑的因素和是enhancesome的重要组成部分。此蛋白含有结构DNA结合结构域和可作为转录调控因子起作用。的缺失,扩增,和与粘液样脂肪肉瘤相关该基因的重排的鉴定表明在脂肪生成和间质分化的作用。基因敲除小鼠对应的研究表明,该基因参与饮食引起的肥胖。备用转录剪接变体,编码不同同种型,已经表征。 [由RefSeq的,2008年7月提供]
HMGA2基因(以及对应的蛋白质)的细胞分布位置:
HMGA2基因的本体(GO)信息:
| 名称 |
|---|
| 5202 Transcriptional misregulation in cancers [PATH:hsa05202] |
| 5206 MicroRNAs in cancer [PATH:hsa05206] |
| 名称 |
|---|
| Cellular responses to stress |
| Cellular Senescence |
| DNA Damage/Telomere Stress Induced Senescence |
| Formation of Senescence-Associated Heterochromatin Foci (SAHF) |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Lipomatosis, Multiple | 0.123528744 | 13 | 0 | BeFree_CTD_human |
| Liposarcoma, Dedifferentiated | 0.120814326 | 3 | 0 | BeFree_ORPHANET |
| Liposarcoma, well differentiated | 0.120542884 | 2 | 0 | BeFree_ORPHANET |
| Diabetes Mellitus, Non-Insulin-Dependent | 0.120542884 | 3 | 1 | BeFree_GWASCAT |
| Polycystic Ovary Syndrome | 0.12 | 1 | 1 | GWASCAT |
| Infant length | 0.12 | 1 | 1 | GWASCAT |
| Birth length | 0.12 | 1 | 1 | GWASCAT |
| Birth Weight | 0.12 | 1 | 0 | CTD_human |
| Lipoma | 0.015472187 | 57 | 0 | BeFree |
| Fibroid Tumor | 0.014591848 | 36 | 0 | BeFree_GAD_LHGDN |
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