For the first time, ecologists have been able to show that molecular variation in one gene may affect the growth of a population in its natural habitat. Research Professor Ilkka Hanski, University of Helsinki, and Dr Ilik Saccheri, University of Liverpool, UK, discovered that the population growth of the Glanville fritillary butterfly (Melitaea cinxia) is affected by the allelic composition of the phosphoglucose isomerase (Pgi) enzyme. The result challenges previous views according to which allelic variation in populations, and possible consequent differences in individual performance, would be of no significance for population growth.
It has been observed in previous studies on the Glanville fritillary and Colias butterflies that the individuals’ Pgi genotype affects their flight metabolic rate and reproductive performance. The present result proves that these differences between individuals also have repercussions at the population level. The role of Pgi is emphasised by the fact that variation in the other genes studied showed no connection to population growth.
How strongly the differences in Pgi alleles affect population growth depends on ecological factors. The size of the habitat patch and its connectivity to existing populations affect migration and gene flow between populations. The study shows that genetic factors and the structure of the habitat together influence variation in population growth. The results also show that the structure of the habitat and the dynamics of the species in a fragmented habitat maintain variation in the gene encoding for the Pgi enzyme
Research Professor Ilkka Hanski | alfa
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Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
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