Navigation Links
'Blond Genes' May Vary Around the World
Date:5/3/2012

THURSDAY, May 3 (HealthDay News) -- All blonds are not alike, according to a new study that finds different genes dictate flaxen locks in different areas of the globe.

The genetic variant that causes many dark-skinned people from the Solomon Islands to have blond hair is different from the gene possessed by blond Europeans, the study found. Researchers from Stanford University School of Medicine found that this particular variant is absent in the genomes of Europeans.

"Since most studies in human genetics only include participants of European descent, we may be getting a very biased view of which genes and mutations influence the traits we investigate," study co-senior author Carlos Bustamante, professor of genetics at Stanford, said in a university news release. "Here, we sought to test whether one of the most striking human traits, blond hair, had the same -- or different -- genetic underpinning in different human populations."

The frequency of blond hair in the Solomon Islands is between 5 percent and 10 percent, the researchers said.

"They have this very dark skin and bright blond hair," study co-senior author Sean Myles, a former Stanford postdoctoral scholar who is now an assistant professor at the Nova Scotia Agricultural College, said in the release. "It was mind-blowing. As a geneticist on the beach watching the kids playing, you count up the frequency of kids with blond hair, and say, 'Wow, it's 5 to 10 percent.'"

Many locals assumed their blond hair was the result of sun exposure or high fish consumption. Others believed it was a trait passed on by European explorers. The study authors, however, sought to determine if there was a unique genetic basis for this characteristic.

In conducting the study, which is scheduled to be published in the May 4 issue of Science, the researchers assessed Islanders' hair and skin color using a light reflectance meter. The investigators also took participants' blood pressure, measured their heights and weights, and collected 1,000 saliva samples from the villagers to examine their DNA.

To look for the genes associated with blond hair, the researchers then selected 43 of the most blond and 42 of the darkest-haired Islanders from the samples collected, and looked for differences in the frequency of genetic variants between the two groups.

The researchers immediately identified a single signal on chromosome 9, which accounted for 50 percent of the variance in the participants' blond hair. They later identified the gene responsible, called TYRP1. The authors noted that the genetic variant that leads to blond hair among people in the Solomon Islands is not found in the genomes of Europeans.

"Within a week we had our initial result," the study's co-first author, Eimear Kenny, said in the news release. "It was such a striking signal pointing to a single gene -- a result you could hang your hat on. That rarely happens in science. It was one of the best experiences of my career."

"The human characteristic of blond hair arose independently in equatorial Oceania," she said. "That's quite unexpected and fascinating."

"This is one of the most beautiful examples to date of the mapping of a simple genetic trait in humans," David Reich, a professor of genetics at Harvard University who was not involved in the study, said in the news release.

The study authors said the finding underscores the need for genetic studies on isolated populations.

"If we're going to be designing the next generation of medical treatments using genetic information and we don't have a really broad spectrum of populations included, you could disproportionately benefit some populations and harm others," Bustamante said.

More information

The U.S. National Human Genome Research Institute has more about genetic mapping.

-- Mary Elizabeth Dallas

SOURCE: Stanford University School of Medicine, news release, May 3, 2012


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Genes Might Cause Some to Shun Pork
2. Genes Associated With Autism Also Related to Schizophrenia
3. 2 repressor genes identified as essential for placental development
4. Researchers ID Genes That May Determine Mental Illness
5. Brisk Daily Walk Could Counter Obesity Genes
6. Genes Play a Role in Drug Abuse Risk Among Adopted Kids: Study
7. Study finds new genes that cause Baraitser-Winter syndrome, a brain malformation
8. Researchers Spot Genes Behind Macular Degeneration
9. When your left hand mimics what your right hand does: Its in the genes
10. 4 New Genes Linked to Type 2 Diabetes
11. Same Genes Key to Early & Late-Onset Alzheimers: Study
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
'Blond Genes' May Vary Around the World
(Date:6/26/2016)... ... ... Brent Kasmer, a legally blind and certified personal trainer is helping to develop a weight ... app plans to fix the two major problems leading the fitness industry today:, ... program , They don’t eliminate all the reasons people quit their exercise program ...
(Date:6/25/2016)... ... June 25, 2016 , ... The temporary closing of Bruton Memorial Library on June ... , brings up a new, often overlooked aspect of head lice: the parasite’s ability to ... is not a common occurrence, but a necessary one in the event that lice have ...
(Date:6/25/2016)... , ... June 25, 2016 , ... ... and non-athletes recover from injury. Recently, he has implemented orthobiologic procedures as a ... area —Johnson is one of the first doctors to perform the treatment. Orthobiologics ...
(Date:6/24/2016)... ... June 24, 2016 , ... Those who have experienced traumatic events may suffer ... unhealthy avenues, such as drug or alcohol abuse, as a coping mechanism. To avoid ... healthy coping following a traumatic event. , Trauma sufferers tend to feel a range ...
(Date:6/24/2016)... ... 2016 , ... Global law firm Greenberg Traurig, P.A. announced that 20 Florida ... their peers for this recognition are considered among the top 2 percent of lawyers ... as members of this year’s Legal Elite Hall of Fame: Miami Shareholders Mark ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... , June 23, 2016 Research and ... Devices Medical Market Analysis 2016 - Forecast to 2022" ... The report contains up to date financial data derived ... Assessment of major trends with potential impact on the market ... of market segmentation which comprises of sub markets, regional and ...
(Date:6/23/2016)... -- Research and Markets has announced the addition ... to their offering. The ... commercial environment for MedImmune to enter. The US ageing population ... to drive considerable growth for effective anti-influenza medications. The introduction ... considerably, but development is still in its infancy. ...
(Date:6/23/2016)... Calif. , June 23, 2016 ... CST on Thursday, July 7, 2016 , , , , ... ) , , , , EXPERT PANELISTS:  , , ... Naik; Senior Industry Analyst, Christi Bird; Senior Industry Analyst, Divyaa Ravishankar ... The global pharmaceutical industry is witnessing an exceptional ...
Breaking Medicine Technology: