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Tag: "twin" at biology news

Identical twins may have more differences than meet the eye

Identical twins lose some fundamental similarities as they grow older, a new study reports. . .. .. Scientists think that chemical exposure, dietary h...

Twin molecular scissors link creation of microRNAs with gene-silencing

One of the body's primary strategies for regulating its genome is a kind of targeted gene silencing orchestrated by small molecules called microRNAs, or miRNAs. First observed only a few years ago, these molecules appear to inactivate messenger RNA, itself responsible for translating genes into proteins. Scientists have been eager to know more about miRNAs, clearly important players on the geneti...

UCLA scientists discover immune response to HIV differs, even in identical twins

In findings illustrating the difficulty of developing an AIDS vaccine, UCLA AIDS Institute researchers report the immune systems in two HIV-positive identical twins responded to the infection in different ways. . .. The researchers followed the cases of male twins who were infected shortly after their 1983 births in Los Angeles by blood transfusions admi...

How can identical twins be genetically different?

They sleep together, eat together, and most people find it impossible to tell them apart. Identical twins who grow up together share just about everything, including their genes. But sometimes only one twin will have health problems when genetics predicts both of them should. . .. U-M researchers have discovered three genes that are over-expressed in rheuma...

Nutrition a major factor in rise in twin pregnancies

The commonly held view that IVF is the only culprit in the steady increase in the numbers of twins born over the past thirty years was challenged by a scientist speaking at the 22nd annual conference of the European Society of Human Reproduction and Embryology in Prague, Czech Republic, Wednesday 21 June 2006. Professor Robert Jansen, Medical Director of Sydney IVF, Sydney, Australia, said that...

Study finds that a woman's chances of having twins can be modified by diet

An obstetrician well known for his care of and research into multiple-birth pregnancies has found that dietary changes can affect a woman's chances of having twins, and that her overall chance is determined by a combination of diet and heredity. By comparing the twinning rate of vegan women, who consume no animal products, with that of women who do eat animal products, Gary Steinman, MD, PhD, an...

Twin studies reveal genetic components leading to cardiac and kidney disease

Daniel O’Connor, M.D., Professor of Medicine and Pharmacology at the University of California, San Diego (UCSD) School of Medicine has studied about 265 twin pairs over the past few years, which has led him to some surprising discoveries. . .. Studying genetic variations in twins provides scientists with data on traits that are heritable, or passed down through human DNA, versus those determined...
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