Abstract
Eimeria necatrix is an obligate intracellular parasite that has a complex life cycle and causes significant economic losses to the poultry industry. To better understand the cellular invasion mechanism of E. necatrix and develop new measures against its infection, we conducted isobaric tags for relative and absolute quantitation (iTRAQ) proteomic analysis to investigate protein abundance across different life cycle stages, including unsporulated oocysts (UO), sporozoites (SZ) and second-generation merozoites (MZ-2). Our analysis identified a total of 3606 proteins, among which 1725, 1724, 2143 and 2386 were annotated by the Gene Ontology (GO), EuKaryotic Orthologous Groups (KOG), Kyoto Encyclopedia of Genes and Genomes (KEGG) and InterPro (IPR) databases, respectively. We also identified 388, 300 and 592 differentially abundant proteins in SZ vs UO, SZ vs MZ-2 and MZ-2 vs UO, respectively. Further analysis revealed that 118 differentially abundant proteins were involved in cellular invasion and could be categorized into eight groups. These findings provide valuable insights into protein abundance across the different life cycle stages of E. necatrix and offer candidate proteins for future studies on cellular invasion and other biological processes. SignificanceEimeria necatrix is an obligate intracellular parasite results in huge economic losses to the poultry industry. Understanding proteomic variations across the life cycle stages of E. necatrix may offer proteins related to cellular invasion of E. necatrix, and provide resources for the development of new treatment and prevention interventions against E. necatrix infection. The current data provide an overall summary of the protein abundance across the three life cycle stages of E. necatrix. We identified differentially abundant proteins potential related to cellular invasion. The candidate proteins we identified will form the basis of future studies for cellular invasion. This work also will help in the development of novel strategies for coccidiosis control.
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