Washington: It`s believed that the bigger brains are smarter ones. Now scientists have found two genes that not only affect the brain size and intelligence, but also your risk of developing cognitive disorders like Alzheimer`s. The study, the world`s largest brain research conducted by an international team of over 200 scientists, measured the size of the brain and its memory centers in thousands of MRI images from 21,151 healthy people, while simultaneously screening their DNA. They found two genetic variants -- one that appears to be associated with overall brain size and another that was linked to the volume of the hippocampus, or memory centre, which typically shrinks in people with dementia. "We found fairly unequivocal proof supporting a genetic link to brain function and intelligence. For the first time, we have watertight evidence of how these genes affect the brain," lead researcher Paul Thompson, a neurologist at the University of California at Los Angeles was quoted as saying by LiveScience. The researchers involved in the Enhancing Neuro Imaging Genetics through Meta-Analysis (ENIGMA) Consortium scoured the data for single genes that influence disease risk as well as for genes linked to brain-tissue atrophy and brain size.
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