Protective DNA-protein structure at the ends of linear chromosomes. In most tissues, telomeres shorten every time a cell divides and copies its genetic information.
Stress can speed up the aging process, according to a new US study. Scientists based at the University of California have found that cells taken from women who experience high levels of stress appear years older than their actual biological age. The research, published in the Proceedings of the National...
A bull cloned from the clone of a prize-winning animal four years ago is healthy and fertile, Japanese researchers announced last week. The second generation clone was created using a skin cell, taken from a first generation clone when the animal was only four months old. The research, published in...
The likelihood of IVF success could be down to the length of a woman's telomeres - the segments of DNA that make up the ends of chromosomes - reports Nature magazine. US scientists, based at the Tufts-New England Medical Center in Boston, have shown that women whose eggs have shorter chromosome tips...
Dolly the cloned sheep is no more. The Roslin Institute announced last week that she had been put down after a veterinary examination showed that she had a progressive lung disease. Her final resting place will be in Edinburgh - her body is to be preserved for the National Museum of...
The length of your life could be related to the length of your telomeres - the segments of DNA that make up the ends of chromosomes. A new study suggests that people with shorter telomeres may die earlier than those with longer telomeres, either from an infectious disease or a heart...
A team of researchers based at the University of Hawaii has shown that the ageing process is not accelerated in successive generations of cloned mice. Earlier studies carried out on Dolly the sheep indicated that cloned animals might age prematurely. But the US scientists, who published their results in last...
Six cloned calves have cells that appear younger than their biological age, a US biotech firm reported in the current issue of Science. A team working at Advanced Cell Technologies (ACT) found that cells taken from the cows and grown in the laboratory have a lifespan increased by around 50...
A 96-pound bull calf born in Japan last weekend is the first large mammal to be 're-cloned'. The calf has been successfully cloned from the clone of a bull. Scientists in America had previously only produced second-generation clones in mice. The Japanese scientists at the Kagoshima Prefectural Cattle Breeding...
Dolly the cloned sheep could be genetically older than her years, according to follow-up research carried out by the Roslin Institute and its commercial arm PPL Therapeutics, where Dolly-style cloning was developed. Dolly may look like a three year old ewe, but the tips of her chromosomes - called telomeres - show...
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