Based on limited published evidence, SDIM1 is a neuron-enriched membrane protein containing a signal peptide and two transmembrane domains that interacts with the heat shock protein DNAJB4. GO annotations indicate roles in protein binding, folding, and homodimerization. SDIM1 is significantly downregulated in Alzheimer's disease brains and responds to cellular stress 1. Functionally, SDIM1 overexpression enhances neuronal survival following oxygen-glucose deprivation injury, while its downregulation accelerates cell death 1. The protein appears to exert neuroprotection by binding DNAJB4, potentially sequestering this pro-apoptotic factor to increase cell viability 1.