Furthermore, the study demonstrated that elevated serum BDNF levels served as an independent protective factor against suicidal ideation in schizophrenia patients; the reason for this may be that BDNF has a trophic effect, and elevated BDNF can promote nerve growth and development, repair damaged nerves, reduce schizophrenia symptoms, and reduce suicidal ideation. The gene discussed is BDNF; the disease is schizophrenia.