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MHC genotype and near-deterministic mortality in grey seals.

M de Assunção-Franco1, J I Hoffman, J Harwood

  • 1Department of Zoology, University of Cambridge, Cambridge, UK.

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The Major Histocompatability Complex (MHC) is crucial for grey seal pup survival, with low genetic diversity significantly impacting mortality rates. This study highlights the MHC

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Area of Science:

  • Immunology
  • Marine Mammal Biology
  • Population Genetics

Background:

  • The Major Histocompatability Complex (MHC) plays a known role in immunity and recognition.
  • Its precise importance relative to other immune components is not fully understood.
  • Marine mammals like the grey seal often exhibit low MHC allelic diversity.

Purpose of the Study:

  • To investigate the critical role of MHC in immune system function and survival.
  • To determine the impact of MHC genotype diversity on pup survivorship in grey seals.
  • To quantify the contribution of MHC to overall mortality in a low-diversity species.

Main Methods:

  • Comparison of MHC genotype frequencies between grey seal pups and adults.
  • Analysis of the association between specific MHC alleles and pup survival rates.
  • Statistical modeling to estimate the proportion of mortality attributable to MHC diversity.

Main Results:

  • One specific MHC allele was strongly linked to pup survival; absence increased mortality risk.
  • The total number of MHC alleles was a significant predictor of survivorship to adulthood.
  • Approximately 70% of pup mortality was estimated to be attributable to MHC-related factors.

Conclusions:

  • Despite low allelic diversity, the MHC is critically important for grey seal pup survival.
  • MHC diversity is a key determinant of whether pups survive disease and reach adulthood.
  • This research underscores the vital, yet often underestimated, role of MHC in population health and resilience.