New study reveals the first genetic instructions hardwired into the human DNA which is allegedly linked with left-handedness.
According to reports, the instructions are closely associated with the function and the structure of the brain, especially focusing on the parts which are associated with languages. Furthermore, experts at the University of Oxford revealed that left-handed individuals also tended to have superior verbal skills. However, there still remains some doubts about the connection between the brain development and the dominant hand.
The study also revealed that about one in 10 people are left handed. A study in twins genetics also determined that DNA inherited from the parents has a significant role to play in this trait.
In addition, the team also referred to the UK Biobank, which included the study of 40,000 people. A full sequence along with their genetic code was recorded for the study.
Results concluded, only over 38,000 people were left-handed. Furthermore, scientists also examined specific parts of the DNA which influenced left-handedness among individuals. Based on this experiment, scientists found four such hotspots.
“It tells us for the first time that handedness has a genetic component,” commented Prof Gwenaëlle Douaud, one of the researchers of the study.
Among left-handed participants, cytoskeleton changed the structure of the white matter in the brain. Moreover, the study also revealed among left-handed individuals, the two halves of the brain were better connected. The left and the right hemisphere of the brain were reported to be more involved and coordinated with regards to language. Therefore, it could be inferred that left-handed people had better verbal skills, although experts did not have the data to support it.
Results also suggest, left-handed people showed higher risks of schizophrenia and lower risks of Parkinson’s.
Final results suggest, left-handedness is 25% genetic, and 75% down to environment. The latest study however suggests the first 1% of genetic component involved in left-handedness.