The analysis of immunological profiles in wild animals: a case study on immunodynamics in the field vole, Microtus agrestis

Joseph Andres Jackson, Michael Begon, Richard Birtles, Steve Paterson, Ida M. Friberg, Amy Hall, Ann Lowe, Catriona Ralli, Andrew Turner, Malgorzata Zawadzka, Janette E. Bradley

Research output: Contribution to journalSpecial issuepeer-review

56 Citations (SciVal)

Abstract

A revolutionary advance in ecological immunology is that postgenomic technologies now allow molecular mediators defined in laboratory models to be measured at the mRNA level in field studies of many naturally occurring species. Here, we demonstrate the application of such an approach to generate meaningful immunological profiles for wild mammals. We sampled a natural field vole population across the year (n = 307) and developed a battery of cellular assays in which functionally different pro- and anti-inflammatory signalling responses (transcription factors and cytokines) were activated and quantified by Q-PCR. Temporal trends were the strongest feature in the expression data, although some life history stages (mating vs. nonmating males and pregnant females) were also associated with significant variation. There was a striking set of significant negative associations between inflammatory mediators and condition indices reflecting packed erythrocyte volume and relative liver size, spleen size and splenocyte count. Grouped (principal component) measures of inflammatory and anti-inflammatory expression were high in winter, with minima in the breeding season that occurred earlier for grouped anti-inflammatory responses than for grouped inflammatory responses. Some individual immunological mediators also showed patterns unrelated to the breeding season or annual periodic cues. For example, interferon regulatory factor 5 (IRF5) expression declined throughout the study period, indicating a systematic trend in antimicrobial defences. Pinpointing the causes and consequences of such variation may help identify underlying environmental drivers of individual fitness and demographic fluctuation.
Original languageEnglish
Pages (from-to)893-909
Number of pages17
JournalMolecular Ecology
Volume20
Issue number5
Early online date09 Nov 2010
DOIs
Publication statusPublished - 01 Mar 2011

Keywords

  • immunoecology
  • immunoregulation
  • inflammation
  • postgenomic
  • Q-PCR
  • seasonality

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