Porcine salivary proteome analysis identifies potential early pregnancy-specific protein biomarkers
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Keywords:
Biomarkers, Differentially expressed proteins, Early pregnancy, Pig, SalivaAbstract
Early diagnosis of pregnancy is of utmost importance to optimize profit in pig husbandry. Identifying candidate protein biomarkers for early diagnosis of pregnancy in a non-invasive sample such as saliva may produce a colossal
lead to accomplish the purpose. Therefore, in this study, comparative salivary proteome profile of day 12 of gestation, representing elongation of blastocysts stage and non-pregnant sows was explored by label-free quantitation (LFQ) based mass spectrometry approach to identify early pregnancy biomarkers. A total of 115 proteins were identified as differentially expressed proteins (DEPs) with significant difference between non-pregnant and early pregnancy groups. Among the DEPs, majority of the proteins (82 out of 115 DEPs) were found to be down-regulated in early pregnancy group (fold change >2) compared to non-pregnant control. Functional classification and pathway analysis of the DEPs revealed involvement of most of the proteins in integrin signalling pathways, blood coagulation, carbohydrate metabolism, oxidative stress response and regulation of protein folding. Few DEPs with higher fold change during early pregnancy such as thioredoxin, heat shock 70 kDa protein 1A, alpha 1-S haptoglobin, and glutathione S-transferase pi 1 may have potential as biomarkers for early pregnancy diagnosis in pigs based on their recognized role in different pregnancy related activities. Overall, our results provide a set of salivary proteins which can be used as potential biomarkers for early pregnancy diagnosis after large scale validation.
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