Discovery of a Unique Set of Dog-Seroreactive ICoccidioides/I Proteins Using Nucleic Acid Programmable Protein Array

Valley Fever (VF), caused by fungi in the genus Coccidioides, is a prevalent disease in southwestern and western parts of the United States that affects both humans and animals, such as dogs. Although the immune responses to infection with Coccidioides spp. are not fully characterized, antibody-dete...

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Published inJournal of fungi (Basel) Vol. 10; no. 5
Main Authors Koehler, Megan A, Song, Lusheng, Grill, Francisca J, Shubitz, Lisa F, Powell, Daniel A, Galgiani, John N, Orbach, Marc J, Robb, Edward J, Chung, Yunro, Williams, Stacy A, Murugan, Vel, Park, Jin-gyoon, LaBaer, Joshua, Lake, Douglas F, Magee, D. Mitchell
Format Journal Article
LanguageEnglish
Published MDPI AG 01.05.2024
Subjects
Antigen-antibody reactions
Antigens
Dogs
Immunoglobulin G
Nucleic acids
Proteins
Arizona
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Summary:Valley Fever (VF), caused by fungi in the genus Coccidioides, is a prevalent disease in southwestern and western parts of the United States that affects both humans and animals, such as dogs. Although the immune responses to infection with Coccidioides spp. are not fully characterized, antibody-detection assays are used in conjunction with clinical presentation and radiologic findings to aid in the diagnosis of VF. These assays often use Complement Fixation (CF) and Tube Precipitin (TP) antigens as the main targets of IgG and IgM reactivity, respectively. Our group previously reported evidence of over 800 genes expressed at the protein level in C. posadasii. However, antibody reactivity to the majority of these proteins has never been explored. Using a new, high-throughput screening technology, the Nucleic Acid Programmable Protein Array (NAPPA), we screened serum specimens from dogs against 708 of these previously identified proteins for IgG reactivity. Serum from three separate groups of dogs was analyzed and revealed a small panel of proteins to be further characterized for immuno-reactivity. In addition to CF/CTS1 antigen, sera from most infected dogs showed antibody reactivity to endo-1,3-betaglucanase, peroxisomal matrix protein, and another novel reactive protein, CPSG_05795. These antigens may provide additional targets to aid in antibody-based diagnostics.
ISSN:2309-608X
2309-608X
DOI:10.3390/jof10050307