facebook
twitter
rss
account
search
search
 

Genetic link to being left-handed or right-handed discounted

Oct. 1, 2013 at 6:25 PM   |   Comments

NOTTINGHAM, England, Oct. 1 (UPI) -- Why exactly someone is left- or right-handed remains unclear, but scientists in Britain say they've ruled out genetics as having any significant role.

A study of the genome of 4,000 twins failed to find a strong genetic factor in determining handedness, they said.

If there was a single major genetic determination of handedness, there should be a detectable shift between left- and right-handed twins in the frequency of variants in that part of the genome, but that wasn't the case, the researchers reported in the journal Heredity.

"There should be a detectable shift between right- and left-handed people because modern methods for typing genetic variation cover nearly all of the genome," University of Nottingham geneticist John Armour said. "A survey that compared the whole-genome genotypes for right- and left-handed people should leave such a gene nowhere to hide."

The findings contradict some previous studies suggesting a link between handedness and a network of genes involved in establishing left-right asymmetry in developing embryos.

If there are any genetic factors in handedness at all they must be relatively weak and subtle, the researchers said.

"It is likely that there are many relatively weak genetic factors in handedness, rather than any strong factors, and much bigger studies than our own will be needed to identify such genes unambiguously," Armour said. "As a consequence, even if these genes are identified in the future, it is very unlikely that handedness could be usefully predicted by analysis of human DNA."

About 10 percent of people in Britain are left-handed, a percentage found in most populations around the world.

© 2013 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Most Popular
1
New dinosaur species with giant nose discovered in Utah New dinosaur species with giant nose discovered in Utah
2
Perth's first iPhone buyer immediately drops brand new phone on live TV Perth's first iPhone buyer immediately drops brand new phone on live TV
3
Android phones to join iPhone in saying no to the police Android phones to join iPhone in saying no to the police
4
'Finding Nemo' has some basis in science... some 'Finding Nemo' has some basis in science... some
5
Report: Facebook Messenger app is loaded with spyware Report: Facebook Messenger app is loaded with spyware
Trending News
Video
x
Feedback