Scientists Have Re-Cloned Mice To the 25th Generation

...of how telomeres work during cloning.

Science 28 April 2000:
Vol. 288 no. 5466 pp. 586-587
DOI: 10.1126/science.288.5466.586

News of the Week

CELL BIOLOGY
In Contrast to Dolly, Cloning Resets Telomere Clock in Cattle

Gretchen Vogel

When researchers took a close look at the cells of Dolly, the cloned sheep, they found that her telomeres, the caps on the ends of the chromosomes, were shorter than normal. Because telomere length decreases with age, this was an indication that Dolly might age unusually quickly. But on page 665, a physician and his colleagues report that cells from calves that they cloned have telomeres that are longer than normal. According to the researchers, the findings suggest that tissues produced by cloning might last at least as long as the original cells--and perhaps longer.

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/4pgDNd9tElI/story01.htm

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