PHYHIP (phytanoyl-CoA 2-hydroxylase interacting protein) is a cytoplasmic and mitochondrial protein involved in central nervous system development through its interaction with PHYH 1. The protein localizes to multiple cellular compartments including the cytoplasm, mitochondria, and nucleoplasm, with demonstrated protein binding capabilities [GO annotations cited in 25]. Mechanistically, PHYHIP functions as a molecular target for active transport across the blood-brain barrier. Recent evidence demonstrates that PHYHIP-mediated delivery enhances neuroprotective signaling through the NRG1-ErbB4-AKT pathway while suppressing neuroinflammatory cascades via the cGAS-STING-NFκB axis 1. Additionally, PHYHIP serves regulatory functions in gene expression networks, as the PIWIL2 promoter acts as an enhancer for PHYHIP located 60kb upstream 3. Disease relevance spans multiple neurodevelopmental and neurodegenerative conditions. PHYHIP deletions are implicated in non-syndromic autism spectrum disorder 4, and differential methylation of PHYHIP is associated with Lewy body pathology in Parkinson's disease and dementia with Lewy bodies 5. PHYHIP expression changes are stage-specific in Parkinson's disease progression 6. The gene is also dysregulated in glioblastoma with prognostic significance 7, placental dysfunction in fetal growth restriction 8, and melanoma differentiation 9. These diverse roles suggest PHYHIP functions in neuroprotection, immune modulation, and cellular development across multiple pathological contexts.