Left-handed DNA found - and it changes brain structure
The instructions also seem to be heavily involved in the structure and function of the brain - particularly the parts involved in language. The team at the University of Oxford say left-handed people may have better verbal skills as a result.

But many mysteries remain regarding the connection between brain development and the dominant hand.

What does this tell us?

About one in 10 people is left handed. Studies on twins have already revealed genetics - the DNA inherited from parents - has some role to play. However, the specifics are only now being revealed.

The research team turned to the UK Biobank - a study of about 400,000 people who had the full sequence of their genetic code, their DNA, recorded.

Just over 38,000 were left-handed. And the scientists played a giant game of spot-the-difference to find the regions of their DNA that influenced left-handedness.

The study, published in the journal Brain, found four hotspots.

"It tells us for the first time that handedness has a genetic component," Prof Gwenaëlle Douaud, one of the researchers, told BBC News.

But how does it work?

The mutations were in instructions for the intricate "scaffolding" that organises the inside of the body's cells, called the cytoskeleton.

Similar mutations that change the cytoskeleton in snails have been shown to lead to the molluscs having an anticlockwise or "lefty" shell.

Source: https://www.bbc.com/news/health-49579810
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