Download
slide1 n.
Skip this Video
Loading SlideShow in 5 Seconds..
Deliverables D9 Genetic diversity of protistan groups PowerPoint Presentation
Download Presentation
Deliverables D9 Genetic diversity of protistan groups

Deliverables D9 Genetic diversity of protistan groups

131 Views Download Presentation
Download Presentation

Deliverables D9 Genetic diversity of protistan groups

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Deliverables D9 Genetic diversity of protistan groups 1. Develop 18S rRNA gene based detection of selected protistan groups (testate amoebae) 2. Develop and apply 18S rRNA gene based screening tool for testate amoebae

  2. 18S rRNA gene detection Euglypha rotunda Euglypha rotunda Euglypha filifera Euglypha tuberculata Euglypha rotunda Euglypha rotunda Euglypha acanthophorea Euglypha filifera Assulina muscorum Trachelocorythion pulchellum Trinema enchelys Tracheleuglypha dentata Cyphoderia ampulla Paulinella chromatophora Thaumatomonas sp. Cercomonas caudatus 0.01 Phylogeny of Euglyphid Testate Amoebae Order EUGLYPHIDA MONADOFILOSA

  3. 18S rRNA gene detection Chaux-d`Abel A B C D Trinema cluster E.rotunda cluster Assulina cluster Trachelocorytion cluster

  4. 18S rRNA gene detection

  5. PCR with fluorescently labeled primers DNA extraction Enzymatic digestion Fragment separation on sequencing gel Terminal Restriction Fragment Length Polymorphism (T-RFLP)

  6. 18S rRNA gene diversity screening 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 0,1 1 1 336 D 2 337 3 338 C 325 4 5 303 A 6 302 B 7 314 C 8 326 9 Bray-Curtis similarity of T-RFLP profiles from Chaux-d`Abel • Correlation needed with plant cover, restoration stage and • direct observation • Profiles available for Schottland (A, C), France Russey (C, D)

  7. PROBLEMS • Only few DNA samples amplifiable • No PCR-products at all with WP2 DNA samples > consequences for T-RFLP screening of most RECIPE sites > how to continue? • Other important (more important) groups missing! Further deliverables decided during the RECIPE meetings • Clone libraries using primers targeting all eukaryotes > not very useful; mostly „non-target“ (non-protistan) sequences • Clone libraries using primers targeting all ciliates > done for Chaux-d`Abel > is information/additional screening on ciliate community structure usefull for functional microbial diversity analysis/which manuscripts could profit?

  8. Deliverables D9 Genetic diversity of protistan groups 3. Develop FISH probes for the visualization, detection and enumeration of selected protistan groups (testate amoebae)

  9. Fluorescence in situ Hybridization (FISH) Hybridization -ACTGGCGTAAGTCAG- TGACCGCATTCAGTC -ACTGGCGTAAGTCAG- unstained cells stained target cells

  10. Detection by FISH Accessible sites for FISH oligonucleotide probes Amplified region approx. 500 bp

  11. Detection by FISH ...Make it accessible for FISH oligonucleotide probes!! > Use of unlabelled oligonucleotide “helper” probes (Fuchs et al., 2000)

  12. Detection by FISH Chaux-d`Abel A B C D Trinema cluster (E.strigosa/ciliata) E.rotunda cluster Assulina cluster ? Trachelocorytion cluster

  13. Not yet delivered • Screening of bulk samples • Using picked organisms to test specificity • Find organism behind abundant 18S rRNA gene sequences not available as cultures • Top to bottom approach for the first screening > if necessary design of more specific probes with target sites on the complete 18S rRNA gene sequence • FISH probed for selected sequenced testate amoebae... • No probes yet for Assulina; potential sites for Tracheleuglypha dentata and Thaumatomonas clade • Alternative to T-RFLP screening of RECIPE sites?