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Parasites Ready To Jump
Transposons are mobile genetic elements found in the hereditary material of humans and other organisms. They can replicate and the new copies can insert at novel sites in the genome. Because this threatens the whole organism, molecular mechanisms have evolved which can repress transposon activity. Professor Klaus Förstemann of the Gene Center of Ludwig-Maximilians-Universität (LMU) in Munich and a team of researchers working with the fruitfly Drosophila melanogaster have now uncovered a new type of cellular defence that acts against DNA sequences present in high copy numbers inside the cell, even if they have not integrated into the genome. Small molecules of RNA (a class of nucleic acid closely related to the genetic material DNA) play the central role. "Transposons are genomic parasites, so to speak", says Förstemann. "If they are allowed to proliferate, the genome can become unstable or cancers can develop. We now want to find out whether mammalian cells possess this newly discovered defence mechanism and to elucidate precisely how it works." (EMBO Journal online, 30 July 2009.)
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Plant-Based, Low-Carb Diet May Promote Weight Loss And Improve Cholesterol Levels
Overweight individuals who ate a low-calorie, low-carbohydrate diet high in plant-based proteins for four weeks lost weight and experienced improvements in blood cholesterol levels and other heart disease risk factors, according to a report in the June 8 issue of Archives of Internal Medicine, one of the JAMA/Archives journals. A high-carbohydrate, low-fat vegetarian diet also resulted in weight loss but without the additional cardiovascular benefits.
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Handle With Care: Telomeres Resemble DNA Fragile Sites
Telomeres, the repetitive sequences of DNA at the ends of linear chromosomes, have an important function: They protect vulnerable chromosome ends from molecular attack. Researchers at Rockefeller University now show that telomeres have their own weakness. They resemble unstable parts of the genome called fragile sites where DNA replication can stall and go awry. But what keeps our fragile telomeres from falling apart is a protein that ensures the smooth progression of DNA replication to the end of a chromosome.
Cardiovascular

CNN Poll Finds Americans' Opinons Are Divided Regarding The President's Health Reform Push

Americans appear split over the president"s push for health care reform, a new CNN poll has found. "Fifty percent of those questioned in CNN/Opinion Research Corporation survey released Wednesday morning say they support the president"s plans, with 45 percent opposed. The results indicate a generational divide. ""Obama"s plan is most popular among younger Americans and least popular among senior citizens," says CNN Polling Director Keating Holland. "A majority of Americans over the age of 50 oppose Obama"s plan; a majority of those under 50 support it."" "The poll (which polled 1,136 adults by telephone) indicates that only three in 10 of all Americans think the president"s health care proposals will help their families. Another 44 percent feel they won"t benefit but that other families will be helped by the president"s plans, and one in five say no one will be helped ò€¦ In any health care system, tough decisions that affect individual patients - such as which people get certain treatments and which treatments are too expensive or ineffective - must be made. The poll suggests that Americans are split on who they prefer to make such choices, with 40 percent saying it should be the insurance companies and an equal amount feeling that the government should make the call" (Steinhauser, 8/5). This information was reprinted from kaiserhealthnews.org with kind permission from the Henry J. Kaiser Family Foundation. You can view the entire Kaiser Daily Health Policy Report, search the archives and sign up for email delivery at kaiserhealthnews.org. © Henry J. Kaiser Family Foundation. All rights reserved.


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