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PETBioNewsNewsStudy reveals genes linked to left-handedness

BioNews

Study reveals genes linked to left-handedness

Published 6 September 2019 posted in News and appears in BioNews 1014

Author

Dr Yvonne Collins

Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the output from a DNA sequencing machine.
CC BY 4.0
Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the sequencing output from an automated DNA sequencing machine.

A new genome-wide association study has identified specific gene regions that can influence left-handedness and differences in brain organisation which may be linked to better verbal skills...

A new genome-wide association study has identified specific gene regions that can influence left-handedness and differences in brain organisation which may be linked to better verbal skills.

A team led by researchers at the University of Oxford used thousands of brain scans and genetic data to look for associations between genes, brains and handedness. They discovered for the first time, gene regions linked to human handedness and structural differences in language areas of the brain.

'Many researchers have studied the biological basis of handedness, but using large datasets from UK BioBank has allowed us to shed considerably more light on the processes leading to left-handedness,' said Dr Akira Wiberg at the University of Oxford. 'We discovered that, in left-handed participants, the language areas of the left and right sides of the brain communicate with each other in a more coordinated way.'

Using around 400,000 sequenced genomes from the UK BioBank, the researchers found four genetic regions associated with handedness, three of which were linked to proteins involved in brain structure and development. They also showed, using brain scans from around 9000 participants, that these genetic variations caused structural changes to the white matter tracts that join language-processing regions. The authors suggested that this may give left-handers an advantage when it comes to language skills and verbal tasks, but said that this needs to verified in large dataset studies using verbal cognition tests.

'This raises the intriguing possibility for future research that left-handers might have an advantage when it comes to performing verbal tasks, but it must be remembered that these differences were only seen as averages over very large numbers of people and not all left-handers will be similar,' Dr Wiberg said.

The researchers also found that left-handers had a slightly higher chance of schizophrenia and a slightly lower chance of Parkinson's disease, but again, they stressed that more research is needed to determine whether this is more than just coincidence. 

Professor Dominic Furniss, also at Oxford and joint senior author on the study, added: 'Here we have demonstrated that left-handedness is a consequence of the developmental biology of the brain, in part driven by the complex interplay of many genes. It is part of the rich tapestry of what makes us human.'

The work was published in Brain.

Sources and References

  • 05/09/2019
    CNN
    Scientists have identified the genes linked to left-handedness
  • 05/09/2019
    The Guardian
    At last, the benefits of being left-handed are confirmed
  • 06/09/2019
    Evening Standard
    Left-handed people have 'differently wired brains', scientists claim
  • 05/09/2019
    Oxfrod University
    Genes associated with left-handedness linked with shape of the brain's language regions

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