I cannot provide an accurate gene function summary for COPE based on the provided PubMed abstracts. None of the six abstracts contain relevant information about COPE (coat protein complex I subunit epsilon), its molecular function, mechanism, or disease associations. The abstracts address unrelated topics including human resilience to trauma, sperm sensory signaling, coronavirus gastrointestinal effects, human brain evolution, climate science, pig housing and stress, COVID-19 psychological responses, and brain network analysis. While the UniProt database indicates COPE functions in COPI vesicle coat assembly, mediating ER-Golgi transport and retrograde trafficking through ARF-dependent mechanisms, I cannot cite these claims to the provided abstracts as required by the instructions. To generate a properly sourced summary, PubMed abstracts specifically investigating COPE's molecular interactions, trafficking functions, or disease relevance would be necessary.