TITLE (do not change): "The next parasite pandemic: could Plasmodium knowlesi become the next Plasmodium falciparum? Discuss the molecular events that led to P. falciparum zoonosis and what would be required for a P. knowlesi pandemic." BASICS: 2,000 words main text only. References and figure legends excluded. British English. Microsoft Word (.docx). Arial or Times New Roman size 12. Double spacing. Justified. Title page not counted. STRUCTURE: Introduction, 300-350 words. Establish global malaria burden and P. falciparum mortality dominance. Define zoonosis, host specificity, and molecular host barriers. Frame the central question. Close with a sentence outlining the review structure. Subheading 1: Evolutionary origin of P. falciparum and the zoonotic jump. Cover faecal DNA screening of wild great apes. Detail Laverania subgenus: Clade A (P. gaboni, P. adleri) and Clade B (P. praefalciparum, P. reichenowi, P. billcollinsi, P. falciparum). Present whole-genome evidence that P. falciparum descends from gorilla parasite P. praefalciparum, not chimpanzees. Subheading 2: The RH5-Basigin interaction and host restriction. Explain AVEXIS screening for low-affinity extracellular interactions. Discuss basigin (CD147, OK blood group antigen) as essential receptor whose blockade abolishes invasion. Detail the introgression of an 8kb genomic segment containing RH5 from a P. adleri ancestor into the P. falciparum lineage within a doubly infected gorilla. Explain that reconstructed ancestral RH5 bound both human and gorilla basigin. Describe H200Y substitution at position 200, which retained human basigin binding and eliminated gorilla binding. Note RH5 functions within a complex with CyRPA, RIPR, and P113. Subheading 3: P. knowlesi and its current zoonotic status. Describe P. knowlesi as a macaque parasite causing severe human infections in Malaysian Borneo. Evaluate its molecular invasion mechanisms and whether invasion ligands target basigin. Discuss evidence it completes an asexual blood-stage cycle in human erythrocytes. Subheading 4: What would be required for a P. knowlesi pandemic? Compare directly the molecular conditions that enabled P. falciparum human establishment against what is present or absent in P. knowlesi. Analyse barriers to human-to-human transmission. Assess plausibility of analogous introgression or mutational events. Identify research gaps and limitations of current in vitro evidence. Conclusion, 250-300 words. Answer the review question directly. State what evidence supports and what remains unresolved. Propose specific future research directions. CRITICAL EVALUATION: Do not summarise studies. Evaluate evidence and interrogate conclusions throughout. For every finding address: what it showed, how established, experimental limitations, and what it does not prove. End each subsection with an unresolved question or research gap. This is mandatory. Required standard example: Do not write "Crosnier et al. (2011) showed that RH5 binds basigin." Write instead: "Crosnier et al. (2011) demonstrated via AVEXIS that antibody-mediated blockade of RH5-basigin binding abolished erythrocyte invasion, establishing basigin as an essential receptor. Whether additional erythrocyte surface factors impose further constraints in vivo remains unresolved." HARVARD REFERENCING: In-text: (Author, Year), (Author and Author, Year), (Author et al., Year). Reference list alphabetical by first author surname. Format: Surname, Initial. (Year). Title. Journal, Volume(Issue), pages. DOI if available. Every in-text citation must match reference list. No PMID citations alone. Retrieve full details from pubmed.ncbi.nlm.nih.gov.
CORE REFERENCES (these must be used in the critical review) These below must all be read, cited, and critically evaluated in the review: Cowman, PMID 28799908. Molecular basis of erythrocyte invasion. Weiss, PMID 25723550. Sequential order of invasion interactions. Bartholdson, PMID 23166499. MTRAP-Sema7A interaction. Crosnier, PMID 22080952. Discovery of basigin as the essential RH5 receptor. Draper, PMID 30001524. Blood-stage malaria vaccine review. Bartholdson, PMID 23617720. Receptor discovery methodology. Egan, PMID 25954012. Host-based erythrocyte receptor screens. Otto, PMID 29784978. Genomic evidence for P. falciparum evolutionary origin. Galaway, PMID 31613878. RH5 and host tropism. Sharp, PMID 32905751. Zoonotic origin of P. falciparum. Plowright, PMID 28555073. Mechanisms of zoonotic spillover. PMID 25590760. RH5 vaccine in Aotus monkey model. PMID 32359873. RH5 vaccine progress review. PMID 28186186. RH5-CyRPA-RIPR-P113 complex structure. PMID 25132548. Three-dimensional structure of the RH5-Basigin interface. PMID 19593473. Low-affinity extracellular interactions and detection methods.
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