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Scientists identify gene linking brain structure to intelligence
Date:2/11/2014

For the first time, scientists at King's College London have identified a gene linking the thickness of the grey matter in the brain to intelligence. The study is published today in Molecular Psychiatry and may help scientists understand biological mechanisms behind some forms of intellectual impairment.

The researchers looked at the cerebral cortex, the outermost layer of the human brain. It is known as 'grey matter' and plays a key role in memory, attention, perceptual awareness, thought, language and consciousness. Previous studies have shown that the thickness of the cerebral cortex, or 'cortical thickness', closely correlates with intellectual ability, however no genes had yet been identified.

An international team of scientists, led by King's, analysed DNA samples and MRI scans from 1,583 healthy 14 year old teenagers, part of the IMAGEN cohort. The teenagers also underwent a series of tests to determine their verbal and non-verbal intelligence.

Dr Sylvane Desrivires, from King's College London's Institute of Psychiatry and lead author of the study, said: "We wanted to find out how structural differences in the brain relate to differences in intellectual ability. The genetic variation we identified is linked to synaptic plasticity how neurons communicate. This may help us understand what happens at a neuronal level in certain forms of intellectual impairments, where the ability of the neurons to communicate effectively is somehow compromised."

She adds: "It's important to point out that intelligence is influenced by many genetic and environmental factors. The gene we identified only explains a tiny proportion of the differences in intellectual ability, so it's by no means a 'gene for intelligence'."

The researchers looked at over 54,000 genetic variants possibly involved in brain development. They found that, on average, teenagers carrying a particular gene variant had a thinner cortex in the left c
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Contact: Seil Collins
seil.collins@kcl.ac.uk
0044-207-848-5377
King's College London
Source:Eurekalert

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