Candidate Antigens for Q Fever Serodiagnosis Revealed by Immunoscreening of a Coxiella burnetii Protein Microarray

作者: Paul A. Beare , Chen Chen , Timo Bouman , Jozelyn Pablo , Berkay Unal

DOI: 10.1128/CVI.00300-08

关键词: SerologyProtein microarrayQ feverCoxiella burnetiiImmunoscreeningVirologyBiologyContext (language use)AntibodyAntigen

摘要: Q fever is a widespread zoonosis caused by Coxiella burnetii. Diagnosis of usually based on serological testing patient serum. The diagnostic antigen test kits formalin-fixed phase I and II organisms the Nine Mile reference strain. Deficiencies this include (i) potential for cross-reactivity with other pathogens; (ii) an inability to distinguish between C. burnetii strains; (iii) need propagate purify burnetii, difficult potentially hazardous process. Consequently, there sensitive specific serodiagnostic tests utilizing defined antigens, such as recombinant protein(s). Here we describe use protein microarray comprehensively identify immunodominant antigens recognized antibody in context human infection or vaccination. Transcriptionally active PCR products corresponding 1,988 open reading frames (ORFs) were generated. Full-length proteins successfully synthesized from 75% ORFs using Escherichia coli-based vitro transcription translation system (IVTT). Nitrocellulose microarrays spotted crude IVTT lysates probed sera acute patients individuals vaccinated Q-Vax. Immune strongly reacted approximately 50 proteins, including previously identified immunogens, ankyrin repeat-domain containing protein, multiple hypothetical proteins. Recombinant selected array-reactive was generated, immunoreactivity confirmed enzyme-linked immunosorbent assay. This high-throughput method identifying immunoreactive will aid development antigen.

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