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MODERN RESEARCH PROJECTS:
- THE THYLACINE GENOME PROJECT -
(page 1)
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computer model of the structure of part of the DNA double helix
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A computer model of the structure of part of the DNA double helix.

    Within a cell, there are two forms of DNA (Deoxyribonucleic acid): the nuclear DNA (nuDNA) found within the nucleus, and the mitochondrial DNA (mtDNA) found within the mitochondrion.  The mitochondria are small, membrane-enclosed structures (organelles) found within the cytoplasm of the cell, and are responsible for the production of energy (Adenosine-5'-triphosphate [ATP]).

animal cell showing sub-cellular components
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Diagram of an animal cell showing sub-cellular components.  Image: Messer Woland.

1. Nucleolus, 2. Nucleus, 3. Ribosome, 4. Vesicle, 5. Rough Endoplasmic Reticulum, 6. Golgi apparatus (or Golgi body), 7. Cytoskeleton, 8. Smooth Endoplasmic Reticulum, 9. Mitochondrion, 10. Vacuole, 11. Cystosol, 12. Lysosome, 13. Centriole.

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    Inside the inner membrane of the mitochondrion lies the DNA, which is organized as several copies of a single, circular chromosome.  Mitochondrial DNA usually comes from the egg only, and is therefore inherited solely from the mother.

    All of the thylacine's mitochondrial genes were revealed by an international team of scientists (Miller et al. 2009) in a research paper: "The mitochondrial genome sequence of the Tasmanian tiger (Thylacinus cynocephalus)", published on 13th January 2009, in the online edition of the journal "Genome Research".  This research marks the first successful sequencing of genes from the thylacine.

Click the microscope icon for a magnified view of: mitochondrion.
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mitochondrion
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Diagram of a mitochondrion.  Image: Mariana Ruiz Villarreal.

    The genome team's research relied upon new gene-sequencing technology and computational methods developed by Webb Miller and Stephan Schuster of the Pennsylvania State University, Centre for Comparative Genomics & Bioinformatics.

    The new methods involved extracting DNA from the hair of specimens, whereas previous studies had extracted the DNA from bone.  The team's work revealed that hair is an effective time capsule for preserving DNA over long periods, and under a wide range of conditions.

    The keratinised surface of the hair shaft functions like a sheath protecting the DNA from bacterial contamination and degradation.  Schuster states: "I think of hair as a shrine for ancient DNA.  It is sealed so well that not even air or water are able to penetrate the DNA stored inside.  Most importantly, bacteria cannot reach the DNA as long as the structure of the hair remains sound".

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References
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back to: The International Thylacine Specimen Database (page 4) return to the section's introduction forward to: The Thylacine Genome Project (page 2)


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