Guanine nucleotide-binding protein subunit alpha-12

GNA12 (guanine nucleotide-binding protein subunit alpha-12) is a heterotrimeric G protein alpha subunit that functions as a modulator in transmembrane signaling. It primarily activates RhoA through RhoGEFs including ARHGEF12/LARG, subsequently regulating transcription factors like AP-1 and protein phosphatase 2A signaling (UniProt: Q03113). The protein influences cell migration, invasion, and adhesion processes through Rho/ROCK pathway activation and is implicated in tumor cell metastasis and pro-inflammatory cytokine production.

GNA12 is expressed broadly across tissues as part of fundamental G protein signaling networks. While UniProt does not list primary disease associations, the protein's role in Rho signaling and cell adhesion control suggests potential relevance to multiple pathological contexts (UniProt: Q03113).

GNA12 is upregulated in Alzheimer's Disease brain tissue (Chaparral AD proteomics). Post-mortem AD brain samples show elevated GNA12 levels compared to age-matched controls, with a mean log2 fold-change of +0.25 across detected subcellular fractions in TMT-labeled proteomics analysis. This upregulation may implicate altered Rho signaling and cell adhesion dynamics in AD pathology, though functional significance requires further investigation.