Isoform 1 of Rho guanine nucleotide exchange factor 7

ARHGEF7 encodes a Rho guanine nucleotide exchange factor that regulates GTPase signaling pathways. The protein functions as a molecular switch in cytoplasmic signaling cascades controlling cell morphology and motility (UniProt: Q14155-1). As an isoform 1 product of 646 amino acids, it participates in Rho family GTPase activation, a process central to actin dynamics and synaptic plasticity in neurons.

ARHGEF7 is broadly expressed across tissues with documented roles in cytoskeletal regulation. No disease associations are catalogued in UniProt for this protein entry. However, emerging evidence links Rho GTPase exchange factors to neurodegenerative processes through effects on axonal integrity and dendritic spine stability.

In Alzheimer's Disease, ARHGEF7 isoform 1 is significantly down-regulated in post-mortem AD brain tissue relative to age-matched controls (Chaparral AD proteomics). The mean log2 fold-change is −0.94, indicating reduced protein abundance across examined subcellular fractions in the TMT-labeled proteomics dataset. This down-regulation may reflect compromised cytoskeletal remodeling capacity in AD neurons, potentially contributing to synaptic dysfunction and neurodegeneration characteristic of the disease.