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Are genes our destiny?
Date:9/16/2011

LA JOLLA, CA -- A "hidden" code linked to the DNA of plants allows them to develop and pass down new biological traits far more rapidly than previously thought, according to the findings of a groundbreaking study by researchers at the Salk Institute for Biological Studies.

The study, published today in the journal Science, provides the first evidence that an organism's "epigenetic" code - an extra layer of biochemical instructions in DNA - can evolve more quickly than the genetic code and can strongly influence biological traits.

While the study was limited to a single plant species called Arabidopsis thaliana, the equivalent of the laboratory rat of the plant world, the findings hint that the traits of other organisms, including humans, might also be dramatically influenced by biological mechanisms that scientists are just beginning to understand.

"Our study shows that it's not all in the genes," said Joseph Ecker, a professor in Salk's Plant Molecular and Cellular Biology Laboratory, who led the research team. "We found that these plants have an epigenetic code that's more flexible and influential than we imagined. There is clearly a component of heritability that we don't fully understand. It's possible that we humans have a similarly active epigenetic mechanism that controls our biological characteristics and gets passed down to our children. "

With the advent of techniques for rapidly mapping the DNA of organisms, scientists have found that the genes stored in the four-letter DNA code don't always determine how an organism develops and responds to its environment. The more biologists map the genomes of various organisms (their entire genetic code), the more they are discovering discrepancies between what the genetic code dictates and how organisms actually look and function.

In fact, many of the major discoveries that led to these conclusions were based upon studies in plants. There are traits such a
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Contact: Andy Hoang
ahoang@salk.edu
619-861-5811
Salk Institute
Source:Eurekalert  

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