Epigenetic vs. genetic diversity of stenoendemic short toothed sage (Salvia brachyodon Vandas)
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1 Epigenetic vs. genetic diversity of stenoendemic short toothed sage (Salvia brachyodon Vandas) Biruš, I., Liber, Z., Radosavljević, I., Bogdanović, S., Jug Dujaković, M., Zoldoš, V., Šatović, Z. Balkan Botanical Congress 2015.
2 Introduction Short toothed toothed sage (S. brachyodon Vandas) - Illyrian Adriatic stenoendemic species very narrow distribution range three known localities: 1. Sv. Ilija, Pelješac 2. Velji do, Konavle 3. Vrbanje, Mt. Orjen, BH/Monte Negro border
3 Introduction Short toothed toothed sage (S. brachyodon Vandas) propagation germinatively and vegetatively via stolons (field observation) in CRO near threatened (NT), in MN endangered species (EN) narrow endemic species, clonality limited genetic diversity? Could epigenetic modifications be the molecular mechanism enabling evolutionary persistence and phenotypic plasticity?
4 Aims of the Study To study the relationship between epigenetic and genetic variation in narrow endemic and clonally propagated species 1. compare the levels of clonal, genetic and epigenetic diversity among populations 2. determine the relationship between epigenetic and genetic distance among individuals 3. determine the amount of epigenetic variation found among genetically identical organisms
5 Methods 3 populations/ 25 individuals per population (1) Genetic markers a) Microsatellites Simple Sequence Repeats (SSRs) 8 microsatellites, total of 63 markers (2) Epigenetic markers a) MSAP Methylation Sensitive Amplified Polymorphism (MSAP) 4 primer combinations, > 3000 loci
6 Methods - Analysis of global genome methylation MSAP (methylation sensitive amplified polymorphism) modification of AFLP based on differential sensitivity of restriction enzymes (isoshizomeres) such as MspI/HpaII to methylation (5 CCGG 3 )
7 Results: TREE BASED ON GENETIC DISTANCES Population: P01 Pelješac, HRV P02 Cavtat, HRV P03 Mt. Orjen, MNE Unrooted Neighbour Joining tree of short toothed sage samples from 3 populations based on D PSAM genetic distance. The size of the circles at the branch tips is proportional to size (no. of individual plant samples) of the clonal lineage.
8 Results: PROOF OF CLONALITY Range of P-values across different multi-locus genotypes (MLGs) Parameter P01 P02 P03 P gen P gen (F is ) P sex (1 reencounter) P sex (F is ) (1 reencounter) P < 0.05 in all cases Our marker set has enough power to discriminate among clones: identical MLGs can be considered as pertaining to the same clone!
9 Results: CLONAL DIVERSITY No of ramets = 25 Number of genets Genotypic richness Simpson's complement index G R D* P01 P02 P03 P01 P02 P03 P01 P02 P03 High clonal diversity!
10 Results: GENETIC DIVERSITY No. of genets = 16 (P01), 12 (P02), 11 (P03) Allelic richness Observed heterozyogsity Expected heterozygosity 6.00 N ar 0.80 H O 0.80 H E P01 P02 P03 P01 P02 P03 P01 P02 P03 P FIS P01: 0.32 P02: 0.59 P03: 0.22 not significant P Bottleneck P1: 0.19 P2: 0.47 P3: 0.77 High genetic diversity! All populations in Hardy Weinberg Equilibrium! No signs of recent bottleneck events! not significant
11 Results: EPIGENETIC DIVERSITY Shannon's information index H 0.50 Population: P01 P02 P MSAP Total u subepiloci h subepiloci m subepiloci Similar levels of epigenetic diversity across populations and across subepiloci!
12 Results: GENETIC VS. EPIGENETIC DISTANCES 1.00 Epigenetic distance (Dice s) All data: r = P < 0.01 R 2 = Excluding within clone comparisons: r = P < 0.01 R 2 = Genetic distance (Dpsa) Significant but weak correlation between genetic and epigenetic distances! Genetic variability explains between 8 and 18% of epigenetic variability!
13 Results: GENETIC VS. EPIGENETIC DISTANCES WITHIN CLONES, BETWEEN CLONES AND BETWEEN POPULATIONS Marker: SSR MSAP 0.60 Genetic/Epigenetic distance P01 P02 P03 Within clones P01 P02 P03 P01/P02 Between clones P01/P03 P02/P03 Between populations Average epigenetic distance among genetically identical plants only slightly lower than those among genetically different plants!
14 Results: EPIGENETIC DISTANCES WITHIN CLONES, BETWEEN CLONES AND BETWEEN POPULATIONS MSAP markers: Total u subepiloci h subepiloci m subepiloci Epigenetic distance (Dice s ) Within clones Between clones Similar levels of epigenetic distances across subepiloci! Between populations
15 Conclusion: narrow endemic and clonaly propagated species high both clonal and genetic diversity in HWE; no bottleneck epigenetic diversity was more even across populations than clonal and genetic diversity significant but weak correlation between epigenetic and genetic distances relatively high epigenetic distances even among genetically identical individuals epigenetic mechanisms contribute in the evolutionary persistence of these populations
16 Thank you for your kind attention!!
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