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Tetrahymena genome project 2003 presentation by Jonathan Eisen


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Presentation by Jonathan Eisen in February 2003 to NSF Microbial Genomes Workshop on the Tetrahymena genome project

Published in: Health & Medicine, Technology
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Tetrahymena genome project 2003 presentation by Jonathan Eisen

  1. 1. Tetrahymena thermophila genome projectTIGR
  2. 2. Genome Project Planning - coordinated by Ed Orias at UCSB• 8/99 Workshop in Ciliate Genomics• 10/99 First Meeting of Tetrahymena Genome Project Steering Committee• 10/00 Second Meeting of Tetrahymena Genome Project Steering Committee• 8/01 Third Meeting of Tetrahymena Genome Project Steering CommitteeTIGR
  3. 3. Nice Places Tetrahymena is not FromTIGR
  4. 4. Nasty Things that are Not TetrahymenaTIGR
  5. 5. What is Tetrahymena• Fresh-water single-celled protozoan• Member of the alveolate group - ciliate subgroup• Swimming/mobile• Free-living• Grown in pure culture• Dual nuclei - somatic and germ lineTIGR
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  8. 8. QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.TIGR
  9. 9. Cilia Cover the Surface of Tetrahymena, Allowing It to Move and to Sweep Food to Its GulletCilia powering cell movement TIGR
  10. 10. Why Tetrahymena?• Model alveolate and ciliate• Genetic unicellular eukaryotic model• Fundamental biology of eukaryotes• Robust and novel molecular genetic tools• Large research communityTIGR
  11. 11. Examples of Major Discoveries from Studies of Tetrahymena• Dynein motors• RNA mediated catalysis• Telomeres and telomerase• Histone acetylation regulation of transcriptionTIGR
  12. 12. Fig 8-33 Telomerase carries a short RNA molecule that acts as a template for the addition of the complementary DNA sequence at the 3’ end of the double helix. In the ciliate Tetrahymena, the DNA sequence added is TTGGGGTIGR
  13. 13. Self-Splicing of Tetrahymena rRNA (group I intron) • GTP attacks A at 5’ end of intron • Exon 1 uses 3’OH to attack intron/exon 2 phosphodiester bond • Splicing releases linear intron • Intron loses nucleotides at 5’ endTIGR Fig 14.45, Weaver
  14. 14. Tetrahymena as a Model Alveolate• Ciliates are sister group for apicomplexans• Model for studies of ciliates (e.g., Ich, Parmecium)• Free-living, pure culture, non-pathogenic• Heterologous expression of Alveolate genes• Large research community (~100 groups)TIGR
  15. 15. Tetrahymena Uses forFundamental Biology of Eukaryotes• Cell motility• Programmed DNA rearrangements• Regulated secretion• Phagocytosis• Tubulins• Histones• Telomeres maintenance and function• Many genes, processes and cellular components not found in yeastsTIGR
  16. 16. Genome Processing Between Micro and MacronucleusTIGR
  17. 17. Macronuclear Genome• Little repetitive DNA• 180 Mbp genome• Little evidence for large duplications• No centromeres• Few and small introns• No alternative splicing reported• Genes are lower At (63%) than rest of the genome (83%)TIGR
  18. 18. Tools in Tetrahymena• Conventional genetic tools – Conjugation, Genetic crossing, Inducible self- fertilizatoin• Advanced genetic tools – Transformation, Gene disruption, Gene replacement – Gene overexpression, Ribosome antisense repression• Ease of use – Grows fast (1.5 h doubling) in pure culture – Large cell size – Large T° range for growth – Stoarge in liquid N2 – Large scale sub-cellular compartment fractionationTIGR
  19. 19. Tetrahymena Genomic Resources• Genetic maps (for mic and mac)• Physical maps• EST projects – Protist EST project in Canada - 50,000 ESTs – EST project at U. Chicago – Gene index at TIGR• Genome wide librariesTIGR
  20. 20. Other Ciliate Projects• Paramecium genomic survey (Dr. Linda Sperling, Centre de Genetique Moleculaire, CNRS, France)• European rumen ciliate cDNA project (C. Jamie Newbold, Rowett Research Institute, Aberdeen, UK)• Oxytricha (Spirotrich ciliate) micronuclear BAC project (Laura Landweber, Princeton University);• Ichthyophthirius EST sequencing proposal (Theodore G. Clark, Cornell UniversityTIGR
  21. 21. Tetrahymena Genome Project• Strain selection: – inbred strain B- strain of choice for molecular genetic work – Strain SB210• Macronuclear DNA – Most of the repeats already removed – Mitochondrial DNA can be mostly removed – Working on removing rDNA• Small and medium insert libraries made• Due to high AT content large inserts are difficult to construct• Proposals in review by NSF (3x) and NIGMS (5x plus database)TIGR
  22. 22. Bioinformatics Plans• Gene finding, gene indices, ESTs• Functional annotation• Orthologs with mammals/animals – Especially those not in yeast• Orthologs with Apicomplexans• PhylogenyTIGR
  23. 23. Tetrahymena Genome Database• Phenotypes associated with gene knockouts, replacements and other types of mutations.• Gene regulation information from the literature.• Post-translational modifications.• Linkage & physical maps• DNA polymorphisms• Experimental protocols• Links to other sitesTIGR
  24. 24. QuickTime™ and aTIFF (LZW) decompressorare needed to see this picture.TIGR
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  28. 28. QuickTime™ and aTIFF (LZW) decompressorare needed to see this picture.TIGR
  29. 29. QuickTime™ and aTIFF (LZW) decompressorare needed to see this picture.TIGR
  30. 30. QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.TIGR