clone study dolly’s ‘twins’ still alive
Last Updated : GMT 05:17:37
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Last Updated : GMT 05:17:37
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Clone study: Dolly’s ‘twins’ still alive

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Emiratesvoice, emirates voice Clone study: Dolly’s ‘twins’ still alive

Dolly ... world’s first animal clone
Paris - Arab Today

Four genetically-identical copies of Dolly the famous cloned sheep, which suffered ill health and died prematurely in 2003, are going strong at the advanced age of nine, a study said Tuesday.
Debbie, Denize, Dianna and Daisy — identical sisters of Dolly, though born 11 years later — were “in pretty good health,” according to researchers who studied whether cloned animals can live long, healthy lives.
The quadruplets were made from the same mammary gland cell line that yielded Dolly — the first mammal cloned using a technique called somatic-cell nuclear transfer (SCNT).
Born 20 years ago on July 5, 1996, Dolly developed crippling knee arthritis aged five and died of lung disease at the age of six — about half the life expectancy of her breed of Finn-Dorset sheep.
Dolly’s ill health and early demise raised red flags that clones may be sickly and age prematurely compared to naturally-conceived peers.
Cloned lab mice, too, have shown a propensity for obesity, diabetes, and dying young.
Kevin Sinclair of the University of Nottingham and a team conducted thorough medical exams on the four “Dollies” born in July 2007, as well as nine other sheep clones from different cell cultures.
All 13 animals, aged seven to nine, were the product of lab studies seeking to improve the efficiency of SCNT.
Experts measured the sheep’s glucose tolerance, insulin sensitivity, blood pressure and muscle and bone strength, in what they said was the first comprehensive assessment of age-related disease in animal clones.
A few of the sheep had mild osteoarthritis, the team found, and one a “moderate” form of the ailment — though this was not unusual for their age. None of the sheep were lame, as Dolly was.
Despite their “advanced age,” none of the sheep were diabetic, and they had normal blood pressure.

Source: Arab News

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