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miércoles, 12 de septiembre de 2012

Bits of Mystery DNA, Far From ‘Junk,’ Play Crucial Role

Bits of Mystery DNA, Far From ‘Junk,’ Play Crucial Role

http://www.nytimes.com/2012/09/06/science/far-from-junk-dna-dark-matter-proves-crucial-to-health.html?_r=1&nl=afternoonupdate&emc=edit_au_20120905


Bits of Mystery DNA, Far From ‘Junk,’ Play Crucial Role
By GINA KOLATA
Published: September 5, 2012 574 Comments


Among the many mysteries of human biology is why complex diseases like diabetes, high blood pressure and psychiatric disorders are so difficult to predict and, often, to treat. An equally perplexing puzzle is why one individual gets a disease like cancer or depression, while an identical twin remains perfectly healthy.

Béatrice de Géa for The New York Times

“It is like opening a wiring closet and seeing a hairball of wires,” Mark Gerstein of Yale University said of the DNA intricacies.

GRAPHIC: Rethinking ‘Junk’ DNA

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Now scientists have discovered a vital clue to unraveling these riddles. The human genome is packed with at least four million gene switches that reside in bits of DNA that once were dismissed as “junk” but that turn out to play critical roles in controlling how cells, organs and other tissues behave. The discovery, considered a major medical and scientific breakthrough, has enormous implications for human health because many complex diseases appear to be caused by tiny changes in hundreds of gene switches.

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