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Keyword: mirna

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  • Heart cells coaxed to divide and conquer

    12/06/2012 12:33:50 AM PST · by neverdem · 9 replies
    NATURE NEWS ^ | 05 December 2012 | Kerri Smith
    The heart does have a limited ability to heal itself — and a genetic 'trick' can harness this. Can heart cells renew themselves, and can scientists help them do so? Two papers published online in Nature today suggest that heart muscle cells can make copies of themselves at a very low rate1, but that a genetic trick can prompt them to do a better job2. Those results give hope that hearts damaged by cardiovascular disease — which causes the deaths of almost 17 million people a year — could be coaxed to regenerate themselves. Heart muscle cannot renew itself very...
  • Ultraconserved sequences pose megaproblems for evolutionary theory

    02/05/2009 7:26:33 PM PST · by GodGunsGuts · 33 replies · 988+ views
    Journal of Creation ^ | Peter Borger and Royal Truman
    According to Darwinian theory, in the past we had a common ancestor with baboons, further back with bananas and still further with bacteria. This dogma has spread like a ‘meme’, which is a contagious idea that propagates in a similar way as a virus by infecting brains, according to inventor of the word, Richard Dawkins.1 In 2002, Roy Britten dispelled the first monkey meme that human and chimpanzee DNA sequences are 98.5% identical.2 He showed that when indelmutations were also taken into account, the difference suddenly became about 5%. The fact that chimpanzee genomes are about 10% larger than that...
  • Small RNAs can prevent spread of breast cancer

    01/10/2008 12:46:11 AM PST · by neverdem · 7 replies · 61+ views
    Howard Hughes Medical Institute researchers have identified small pieces of ribonucleic acid (RNA) that suppress the spread of breast cancer to the lungs and bone. The new research shows that the most invasive and aggressive human breast cancer tumors are missing three critical microRNA molecules. When the researchers put those molecules back into human breast cancer tumors in mice, the tumors lost their ability to spread. “The tiny RNAs prevent the spread of cancer by interfering with the expression of genes that give cancer cells the ability to proliferate and migrate,” said senior author Joan Massagué, a Howard Hughes Medical...
  • Small Molecule, Big Threat

    11/25/2006 9:08:17 PM PST · by neverdem · 9 replies · 708+ views
    ScienceNOW Daily News ^ | 14 November 2006 | Jennifer Couzin
    A tiny sliver of RNA can destroy an animal's heart, according to research published online this week in Proceedings of the National Academy of Sciences. The finding boosts evidence that such fragments--known as microRNAs (miRNAs)--play important roles in health and disease. Hundreds of miRNAs have been identified in plants and animals. Despite their tiny size--less than 0.2% the length of the average gene--miRNAs exert a powerful amount of control on gene expression (ScienceNOW, 19 January 2005). Scientists have found that miRNAs regulate early development, for example, and may play a role in cancer progression. But while more and more researchers...