| Gene Symbol | RAC2 |
|---|---|
| Full Name | RAS-Related C3 Botulinum Toxin Substrate 2 |
| Chromosomal Location | 22q13.1 |
| NCBI Gene ID | 5879 |
| OMIM | 602049 |
| Ensembl ID | ENSG00000128340 |
| UniProt ID | P15153 |
| Associated Diseases | Neutrophil Immunodeficiency Syndrome, Parkinson's Disease, Alzheimer's Disease |
RAS-Related C3 Botulinum Toxin Substrate 2 (RAC2) is a small GTPase belonging to the Rho family of GTP-binding proteins. Like other Rho GTPases, RAC2 cycles between an active GTP-bound state and an inactive GDP-bound state, functioning as a molecular switch that regulates diverse cellular processes.[1] RAC2 is highly expressed in hematopoietic cells but also has significant expression in the nervous system, particularly in neurons and microglia. It plays essential roles in actin cytoskeleton dynamics, synaptic plasticity, and immune cell function.[2]
In the brain, RAC2 is critically involved in regulating dendritic spine morphology and synaptic function. Through its effects on the actin cytoskeleton via the WASF (Wiskott-Aldrich syndrome protein family) complex, RAC2 influences filopodia and lamellipodia formation, which are fundamental to synaptic structure and plasticity.[2] Additionally, RAC2 regulates microglial chemotaxis and phagocytosis, linking it to neuroinflammatory processes in neurodegenerative diseases.[3] Dysregulated RAC2 signaling has been implicated in both Alzheimer's disease (AD) and Parkinson's disease (PD), where it contributes to synaptic deficits and chronic neuroinflammation.[4][5]
RAC2 is a small GTPase belonging to the Rho family. It cycles between active (GTP-bound) and inactive (GDP-bound) states, acting as a molecular switch for various cellular processes.