Correlates of Vaccine Protection Against Sub-species Infection Revealed in a Transcriptomic Study of Responses in Gudair Vaccinated Sheep

Overview

Journal Front Vet Sci

Specialty Veterinary Medicine

Date 2022 Dec 12

PMID 36504842

Authors

Auriol C Purdie

Karren M Plain

Hannah Pooley

Douglas J Begg

Kumudika de Silva

Richard J Whittington

Affiliations

Soon will be listed here.

Abstract

A critical hindrance in the development of effective vaccine strategies to combat infectious disease is lack of knowledge about correlates of protection and of the host responses necessary for successful adaptive immunity. Often vaccine formulations are developed by stepwise experimentation, with incomplete investigation of the fundamental mechanisms of protection. Gudair is a commercially available vaccine registered for use in sheep and goats for controlling spread of sub-species (MAP) infections and reduces mortality by up to 90%. Here, using an experimental infection model in sheep, we have utilized a transcriptomics approach to identify white blood cell gene expression changes in vaccinated, MAP-exposed Merino sheep with a protective response in comparison to those vaccinated animals that failed to develop immunity to MAP infection. This methodology facilitated an overview of gene-associated functional pathway adaptations using an analysis approach. We identified a group of genes that were activated in the vaccine-protected animals and confirmed stability of expression in samples obtained from naturally exposed commercially maintained sheep. We propose these genes as correlates of vaccine induced protection.

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