LAMB3基因编码层粘连蛋白β3亚基,属于层粘连蛋白(Laminin)基因家族,该家族成员是基底膜的重要组成成分,参与细胞粘附、迁移、分化和组织结构的维持。LAMB3与层粘连蛋白α3和γ2亚基共同形成层粘连蛋白-332(Laminin-332,曾称Laminin-5),主要分布于皮肤、角膜等上皮组织的基底膜中,对维持表皮与真皮连接至关重要。LAMB3的功能特点包括促进角质形成细胞粘附、支持上皮细胞迁移(如在伤口愈合中),并参与信号传导。若LAMB3发生突变(如R635X或R42X等无义突变),会导致其表达产物结构异常或缺失,引发交界型大疱性表皮松解症(JEB),表现为皮肤脆性增加、水疱形成及黏膜损伤,严重者可能危及生命。LAMB3过表达可能与某些肿瘤(如乳腺癌、胃癌)的侵袭和转移相关,因其可增强癌细胞迁移能力;而表达降低则可能导致上皮完整性破坏,影响组织修复。LAMB3基因家族(层粘连蛋白家族)的共性包括:均由α、β、γ三条链组成异源三聚体,通过不同亚基组合形成多种异构体(如Laminin-111、-332等),均含有EGF样重复序列和球状结构域,介导与整合素等受体的相互作用。该家族在胚胎发育、组织稳态及疾病中发挥广泛作用,突变常导致肌肉、神经或皮肤病变。
The product encoded by this gene is a laminin that belongs to a family of basement membrane proteins. This protein is a beta subunit laminin, which together with an alpha and a gamma subunit, forms laminin-5. Mutations in this gene cause epidermolysis bullosa junctional Herlitz type, and generalized atrophic benign epidermolysis bullosa, diseases that are characterized by blistering of the skin. Multiple alternatively spliced transcript variants that encode the same protein have been found for this gene. [provided by RefSeq, Jul 2008]
由该基因编码的产物是属于家族基底膜蛋白的层粘连蛋白。这种蛋白质是β亚基的层粘连蛋白,其与α-和伽玛亚基一起形成层粘连蛋白-5。突变该基因导致表皮松解交界赫利茨类型,以及广义萎缩性良性表皮松解,疾病的特征在于皮肤的起泡。编码相同蛋白质的多个可变剪接转录物变体已经发现这种基因。 [由RefSeq的,2008年7月提供]
LAMB3基因(以及对应的蛋白质)的细胞分布位置:
LAMB3基因的本体(GO)信息:
| 名称 |
|---|
| 4151 PI3K-Akt signaling pathway [PATH:hsa04151] |
| 4512 ECM-receptor interaction [PATH:hsa04512] |
| 4510 Focal adhesion [PATH:hsa04510] |
| 5200 Pathways in cancer [PATH:hsa05200] |
| 5222 Small cell lung cancer [PATH:hsa05222] |
| 5146 Amoebiasis [PATH:hsa05146] |
| 5145 Toxoplasmosis [PATH:hsa05145] |
| 名称 |
|---|
| Anchoring fibril formation |
| Assembly of collagen fibrils and other multimeric structures |
| Cell junction organization |
| Cell-Cell communication |
| Collagen formation |
| Degradation of the extracellular matrix |
| Extracellular matrix organization |
| Laminin interactions |
| Non-integrin membrane-ECM interactions |
| Type I hemidesmosome assembly |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Adult junctional epidermolysis bullosa (disorder) | 0.56 | 1 | 9 | CLINVAR_CTD_human_MGD_ORPHANET_UNIPROT |
| Herlitz Disease | 0.440271442 | 2 | 13 | BeFree_CLINVAR_MGD_ORPHANET_UNIPROT |
| Junctional Epidermolysis Bullosa | 0.136316307 | 32 | 2 | BeFree_CTD_human_LHGDN |
| Amelogenesis imperfecta local hypoplastic form | 0.120271442 | 1 | 1 | BeFree_CLINVAR |
| Colorectal Neoplasms | 0.00272435 | 1 | 0 | LHGDN |
| Squamous cell carcinoma | 0.00272435 | 1 | 0 | LHGDN |
| Uterine Cervical Neoplasm | 0.002367032 | 1 | 0 | GAD |
| Disorder of macula of retina | 0.002367032 | 1 | 0 | GAD |
| Epidermolysis Bullosa | 0.001085767 | 4 | 0 | BeFree |
| Malignant neoplasm of prostate | 0.000542884 | 2 | 0 | BeFree |
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