Dinos’ DNA Demise: Genetic Material Has a 521-Year Half-Life
2012-10-15 0:00

By Matt Kaplan | ScientificAmerican.com

A new analysis confirms the widely held suspicion that DNA from dinosaurs and ancient insects trapped in amber cannot be recovered to make a ’Jurassic Park’-style theme park


Few researchers have given credence to claims that samples of dinosaur DNA have survived to the present day, but no one knew just how long it would take for genetic material to fall apart. Now, a study of fossils found in New Zealand is laying the matter to rest — and putting paid to hopes of cloning a Tyrannosaurus rex.

After cell death, enzymes start to break down the bonds between the nucleotides that form the backbone of DNA, and micro-organisms speed the decay. In the long run, however, reactions with water are thought to be responsible for most bond degradation. Groundwater is almost ubiquitous, so DNA in buried bone samples should, in theory, degrade at a set rate.

Determining that rate has been difficult because it is rare to find large sets of DNA-containing fossils with which to make meaningful comparisons. To make matters worse, variable environmental conditions such as temperature, degree of microbial attack and oxygenation alter the speed of the decay process.

But palaeogeneticists led by Morten Allentoft at the University of Copenhagen and Michael Bunce at Murdoch University in Perth, Australia, examined 158 DNA-containing leg bones belonging to three species of extinct giant birds called moa. The bones, which were between 600 and 8,000 years old, had been recovered from three sites within 5 kilometres of each other, with nearly identical preservation conditions including a temperature of 13.1 ºC. The findings are published today in Proceedings of the Royal Society B.

Diminishing returns

By comparing the specimens’ ages and degrees of DNA degradation, the researchers calculated that DNA has a half-life of 521 years. That means that after 521 years, half of the bonds between nucleotides in the backbone of a sample would have broken; after another 521 years half of the remaining bonds would have gone; and so on.


[...]


Read the full article at: scientificamerican.com






Related Articles


Latest News from our Front Page

Israeli spy Jonathan Pollard to be released in November
2015-07-29 23:25
Parole board decides to release convicted spy after 30 years; Israeli officials deny claims that development is linked to the deal with Iran over its nuclear program. A federal parole board has ruled that Jonathan Pollard, a former US Navy intelligence officer convicted of spying for Israel, will be released in November after serving a 30-year prison sentence, his attorneys said ...
Swedish University removes all portraits and busts of White Male Professors
2015-07-29 23:51
Portraits and busts of all the “white male professors” have been removed from the part of Stockholm University, Sweden, which is dedicated to the study of Law. Not only have they be removed, but they have also been replaced by artwork which apparently promotes “diversity”. One of these is a drawing of a moose head colored with a rainbow. Dean of Stockholm University, ...
40% of Palestinian Children Detained by Israel Are Sexually Abused: Virtually All Are Tortured
2015-07-29 22:52
According to a new report by the independent, non-governmental, human rights organization the Palestinian Prisoners Club (PPC), at least 600 Palestinian children have been arrested in Jerusalem alone in the past five months. Of these, roughly 40% were sexually abused. PPC attorney Mufeed al-Haj notes that this horrific, grotesque abuse is not the only crime of which the Israeli military is ...
Barbara Lerner Spectre On Twitter!
2015-07-28 23:04
Kevin MacDonald writes in 2010: In the video below, Barbara Lerner Spectre, who runs a government-funded Jewish study group in Sweden, makes the following remarkable statement—remarkable because she does not attribute anti-Jewish attitudes to irrational prejudices or even Muslims who hate Israel. Instead she says that it’s because of the “leading role” played by Jews in the movement toward multiculturalism: “I think ...
Sweden investigating underwater wreckage as possible Russian submarine
2015-07-28 20:38
What may be the wreckage of a Russian submarine is seen off the coast of Sweden The Swedish military is studying a video taken by shipwreck hunters who say it shows a wrecked submarine, just off the country’s eastern coast, which appears to be Russian. Ocean X Team, the company behind the discovery, said on its website: “It is unclear how old ...
More News »