Systems Biochemistry of Malaria-Induced Haemolysis: Network Analysis of Oxidative and Inflammatory Cascades in Plasmodium falciparum-Infected Nigerian Children

Severe malarial anaemia in Nigerian children results from a complex interplay of parasite-driven haemolysis, oxidative damage to erythrocytes, dyserythropoiesis, and inflammatory suppression of erythropoiesis that is inadequately described by conventional linear biochemical models. This dissertation develops a systems biochemistry framework that employs network analysis to characterise the interconnected oxidative and inflammatory cascades driving malaria-induced haemolysis in Plasmodium falciparum-infected children in Nigeria. A multi-site longitudinal study enrolled two hundred and sixty children under ten years from Plateau, Anambra, and Kebbi states, collecting blood at acute malaria presentation, clinical recovery at day seven, and convalescence at day twenty-eight. A comprehensive biochemical panel was measured at each timepoint, encompassing haematological indices, erythrocyte mechanical fragility, lipid peroxidation markers, erythrocyte antioxidant enzyme activities, haemin-protein adducts, free haem quantification, complement activation products, pro- and anti-inflammatory cytokine multiplex panels, erythropoietin, hepcidin, haptoglobin, and haemopexin. Biochemical network construction from temporal correlation matrices was performed in R using the weighted gene co-expression network analysis framework adapted for biochemical variable networks. Network topology analysis identified four co-regulated biochemical modules with distinct temporal dynamics. The haemolysis-oxidative stress module and the inflammatory-erythropoiesis suppression module showed the highest intra-module connectivity and were significantly correlated with severe anaemia outcomes. Key hub biochemical variables identified by network analysis include free haem, hepcidin, and haemopexin, suggesting central regulatory roles not previously characterised in a unified network model. The dissertation's original theoretical contribution is the first integrated network model of malaria-induced haemolysis biochemistry in African children. Keywords: malaria, haemolysis, systems biochemistry, network analysis, Nigerian children.