ACTB (actin beta)
ACTB, encoding beta-actin, is a highly conserved member of the actin gene family that serves as a fundamental component of the eukaryotic cytoskeleton. Unlike alpha-actin, which is predominantly expressed in muscle cells, beta-actin is ubiquitously expressed in non-muscle cells, where it polymerizes into microfilaments to maintain cell shape, facilitate intracellular transport, and drive essential processes such as cell division, migration, and adhesion. The functional integrity of beta-actin relies on the dynamic equilibrium between its polymerization and depolymerization, a process that is tightly regulated by interactions with motor proteins like myosin and other cytoskeletal regulators. Disruptions in this balance, whether through genetic mutations or altered expression levels, can severely compromise cellular mechanics; for instance, heterozygous germline mutations in ACTB are linked to Baraitser-Winter syndrome, a neurodevelopmental disorder characterized by intellectual disability, epilepsy, and facial dysmorphism, while somatic mutations or overexpression are frequently associated with enhanced tumor cell motility and metastatic potential. Conversely, reduced expression or abnormal distribution of beta-actin, as observed in neurodegenerative conditions like Alzheimer's disease, can destabilize the cytoskeleton, impair synaptic function, and contribute to broader pathologies including cardiovascular disease and chronic inflammation. Although ACTB is widely utilized as a housekeeping gene for normalizing expression data in molecular biology experiments, its expression can fluctuate under stress or disease states, necessitating careful validation in experimental contexts.
Gene Ontology
Subcellular localization of ACTB (and its protein):
- plasma membrane
- cytoplasm
- extracellular
- golgi
- vesicle
- cytoskeleton
- endoplasmic reticulum
- nucleus
- endosome
- lysosome
- mitochondrion
Gene Ontology (GO) terms for ACTB:
| Interacting Gene | Interaction | Source/Score |
| Name |
|---|
| 4015 Rap1 signaling pathway [PATH:hsa04015] |
| 4390 Hippo signaling pathway [PATH:hsa04390] |
| 4145 Phagosome [PATH:hsa04145] |
| 4810 Regulation of actin cytoskeleton [PATH:hsa04810] |
| 4510 Focal adhesion [PATH:hsa04510] |
| 4520 Adherens junction [PATH:hsa04520] |
| 4530 Tight junction [PATH:hsa04530] |
| 4611 Platelet activation [PATH:hsa04611] |
| 4670 Leukocyte transendothelial migration [PATH:hsa04670] |
| 4921 Oxytocin signaling pathway [PATH:hsa04921] |
| 4919 Thyroid hormone signaling pathway [PATH:hsa04919] |
| 4971 Gastric acid secretion [PATH:hsa04971] |
| 5205 Proteoglycans in cancer [PATH:hsa05205] |
| 5410 Hypertrophic cardiomyopathy (HCM) [PATH:hsa05410] |
| 5412 Arrhythmogenic right ventricular cardiomyopathy (ARVC) [PATH:hsa05412] |
| 5414 Dilated cardiomyopathy (DCM) [PATH:hsa05414] |
| 5416 Viral myocarditis [PATH:hsa05416] |
| 5110 Vibrio cholerae infection [PATH:hsa05110] |
| 5130 Pathogenic Escherichia coli infection [PATH:hsa05130] |
| 5132 Salmonella infection [PATH:hsa05132] |
| 5131 Shigellosis [PATH:hsa05131] |
| 5100 Bacterial invasion of epithelial cells [PATH:hsa05100] |
| 5164 Influenza A [PATH:hsa05164] |
| Name |
|---|
| Axon guidance |
| Chaperonin-mediated protein folding |
| Chromatin modifying enzymes |
| Chromatin organization |
| Cooperation of Prefoldin and TriC/CCT in actin and tubulin folding |
| Developmental Biology |
| EPH-Ephrin signaling |
| EPHB-mediated forward signaling |
| Fcgamma receptor (FCGR) dependent phagocytosis |
| Folding of actin by CCT/TriC |
| Gene Expression |
| HATs acetylate histones |
| Immune System |
| Innate Immune System |
| Insulin-like Growth Factor-2 mRNA Binding Proteins (IGF2BPs/IMPs/VICKZs) bind RNA |
| Metabolism of proteins |
| Prefoldin mediated transfer of substrate to CCT/TriC |
| Protein folding |
| Regulation of actin dynamics for phagocytic cup formation |
| RHO GTPase Effectors |
| RHO GTPases Activate Formins |
| RHO GTPases Activate WASPs and WAVEs |
| Signal Transduction |
| Signaling by Rho GTPases |
| Disease | Score | NofPmids | NofSnps | Source |
| Juvenile-onset dystonia | 0.48 | 1 | 1 | CLINVAR_CTD_human_ORPHANET_UNIPROT |
| Iris Coloboma with Ptosis, Hypertelorism, and Mental Retardation | 0.24 | 1 | 16 | CLINVAR_UNIPROT |
| Dystonia | 0.122995792 | 1 | 0 | BeFree_CTD_human_LHGDN |
| Liver carcinoma | 0.121628651 | 8 | 0 | BeFree_CTD_human |
| Myocardial Ischemia | 0.12 | 1 | 0 | CTD_human |
| Anoxia | 0.12 | 1 | 0 | CTD_human |
| Congenital neurologic anomalies | 0.12 | 1 | 0 | CTD_human |
| Congenital ocular coloboma (disorder) | 0.12 | 1 | 0 | CTD_human |
| Esophageal Neoplasms | 0.12 | 1 | 0 | CTD_human |
| Neoplasm Invasiveness | 0.12 | 1 | 0 | CTD_human |
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