University of Hohenheim

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Presentation transcript:

University of Hohenheim Genetic diversity of Echinococcus multilocularis – comparative results from mitochondrial and microsatellite markers Sandra Schroer, Jenny Knapp, Bruno Gottstein, Anke Dinkel, Thomas Romig University of Hohenheim

Sandra Schroer, University of Hohenheim Background Mitochondrial markers 18 haplotypes worldwide in 3 clusters (analysis of complete cob, nad2, cox1 (Nakao et al. 2009)) additional haplotypes found in Europe (various authors) with shorter fragments (cob, cox1, nad1, nad2, atp6) N1+N2 E1- E5 A1- A10 28.03.2014 Sandra Schroer, University of Hohenheim

Sandra Schroer, University of Hohenheim Background Microsatellite markers Systematic study with EmsB in Europe (Knapp et al. 2009) 571 isolates  32 profiles Proposition concerning epidemiology: mainland- island- hypothesis 28.03.2014 Sandra Schroer, University of Hohenheim

Sandra Schroer, University of Hohenheim Aim of the study Here: Analysis of 358 samples with EmsB and mt markers (fragments of atp6, cox1 and nd1 (~1600bp)) Aim: Analysis of genetic diversity in Europe Comparison of diversity in core area and periphery Same/ similar/ different results by direct comparison of markers? 28.03.2014 Sandra Schroer, University of Hohenheim

Sandra Schroer, University of Hohenheim Results In total: 23 EmsB- profiles 28.03.2014 Sandra Schroer, University of Hohenheim

Sandra Schroer, University of Hohenheim Results In total: 73 mt haplotypes 28.03.2014 Sandra Schroer, University of Hohenheim

Sandra Schroer, University of Hohenheim Results Haplotype diversity index (Nei 1987) 28.03.2014 Sandra Schroer, University of Hohenheim

mitochondrial haplotypes Results Ubiquitous and country- specific variants (n and %) EmsB- profiles mitochondrial haplotypes ubiquitous specific Switzerland 2 (12,1%) 5 (6,06%) 1 (33,3%) 15 (66,6%) Austria 2 (35,7%) / 1 (47,3%) 21 (25,2%) Germany 2 (32,4%) 3 (21,6%) 1 (70,8%) 10 (12,0%) Poland 2 (36,7%) 4 (9,2%) 1 (24,5%) 15 (17,3%) Slovakia 2 (64,8%) 1 (54,0%) 3 (18,0%) 28.03.2014 Sandra Schroer, University of Hohenheim

Sandra Schroer, University of Hohenheim Conclusion High microdiversity both of mitochondrial markers (73 / 358) and EmsB profiles (23 / 358) In both systems: few widespread and numerous rare variants Rare variants are possibly locally restricted and may be useful for geographic studies No apparent correlation between certain mitochondrial haplotypes and microsatellite profiles Geographic distribution of diversities disagree (Germany!) EmsB: highest diversity in Switzerland and Germany mt markers: diversity low in Germany, high in Poland and Austria 28.03.2014 Sandra Schroer, University of Hohenheim

Thanks for your attention! 28.03.2014 Sandra Schroer, University of Hohenheim