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'Museomics' yields new insights into extinct Tasmanian tiger
Date:1/18/2009

January 13, 2009 In 1902, the National Zoo in Washington D.C. arranged to have a unique and endangered animal called the thylacine, or Tasmanian Tiger, brought to the United States from Tasmania. Later that year, a female and her three cubs arrived at the zoo. However, by the mid-1930s, the thylacine was extinct, leaving behind only preserved museum specimens. In a study published online today in Genome Research (www.genome.org), researchers have used state-of-the-art DNA sequencing technology to analyze preserved thylacines, including one of those brought to the National Zoo more than 100 years ago, making novel discoveries in thylacine genomics and the burgeoning field of "museomics."

The thylacine was actually not a tiger at all, rather a marsupial with many dog-like featuresa striking example of convergent evolution in mammals. Extensively hunted by farmers, the thylacine was becoming increasingly rare in the wild at the time the National Zoo acquired the female and cubs, and was declared extinct in 1936 upon the death of the last captive animal. Genetic sequences sampled from the preserved specimens of the National Zoo thyalcine family have been studied in recent years, however these investigations were severely limited by DNA contamination and degradation.

Now, in a strategy nicknamed "museomics," researchers are using improved methods for sampling DNA combined with the latest sequencing technology to analyze preserved museum samples. In this study, an international team of scientists has sequenced mitochondrial and nuclear DNA from the hair of the male thylacine offspring brought to the National Zoo in 1902 and a female that died in the London Zoo in 1893. In addition to refining the place of this unusual animal in evolutionary history, genetic clues to the impending extinction of the thylacine became apparent.

"What I find amazing is that the two specimens are so similar,"
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Contact: Peggy Calicchia
calicchi@cshl.edu
516-422-4012
Cold Spring Harbor Laboratory
Source:Eurekalert  

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