Navigation Links
Genetic predisposition increases childhood asthma risk
Date:8/20/2007

Children who carry variations in specific genes that metabolize vehicle emissions are more susceptible to developing asthma, particularly if they live near major roadways, a study led by researchers at the University of Southern California (USC) suggests.

Researchers found that children who carried variations in two genes and lived within 75 meters of a major road were up to nine times more likely to develop asthma than children who lived further away, says Muhammad T. Salam, Ph.D. candidate at the Keck School of Medicine of USC, and the studys lead author. The study will appear in the journal Thorax, and is now available online.

This is one of the first studies to report that children with certain genetic backgrounds are even more susceptible to asthma than if they lived near major roads and did not carry the variations, Salam says. We are working to understand how traffic-related exposures may interact with these genes, leading to asthma development.

Asthma is the most common chronic disease in children, and previous studies have shown that traffic-related pollution near the home increases asthma risk and reduces lung growth, according to USC experts.

Researchers drew upon data from the Childrens Health Study (CHS), a longitudinal study of respiratory health among school-age children in 12 Southern California communities. They compared associations between number of genetic variants and exposure to toxins among more than 3,000 study participants.

Researchers found that high levels of microsomal epoxide hydrolase (EPHX1)an enzyme that metabolizes polyaromatic hydrocarbons (PAH) in vehicle emissionswas associated with an increased risk for lifetime asthma. Children with high EPHX1 levels who also carried variations in glutathione S-transferase P1 (GSTP1) genes were four times more likely to have asthma.

Among children who lived within 75 meters of a major road, those with high EPHX1 activity were three times more likely to have asthma than those with lower activity. Children who carried both variations and lived within 75 meters of a major road were at the highest asthma risk. The results were consistent for current, early and late onset asthma.

"This finding demonstrates the critical role of gene environment interaction in determining disease susceptibility," says David A. Schwartz, M.D., director of the National Institute of Environmental Health Sciences. "The investigators at USC have identified key genetic variations in biological pathways related to PAH metabolism that are associated with the occurrence of asthma in children who live in close proximity to traffic."

Approximately 12 percent of children in the study carried both of the variations and three percent were in the highest risk group based on where they lived. However, there are a number of genes that could be linked with asthma, and researchers are just beginning to study the associations between genes and environmental factors, Salam says.

It is difficult to say that if parents with an asthmatic child move further from busy streets, the child will definitely have fewer symptoms, he explains. All that can be said at this moment is that data from this and other studies show strong evidence that living near heavy traffic increases asthma risks and exacerbates symptoms in children who already have asthma.


'/>"/>
Contact: Meghan Lewit
lewit@usc.edu
323-442-2830
University of Southern California
Source:Eurekalert

Related medicine news :

1. Genetic Dentistry: Your Dentist may be able to grow you a new set of Teeth.
2. Crowning glory of 2000!!! Cracking of the genetic code is top of tops
3. Genetic influence in menopause
4. Genetics and cholesterol levels
5. Genetics helps in attacking cancer
6. DNA biochip for genetic screening
7. Genetic disorder related with sleep patterns
8. Genetic innovation
9. Sleepwalking has genetic roots
10. A new genetic label for stroke
11. Genetic tests for cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/23/2017)... ... June 23, 2017 , ... 21 Middle East and ... has selected 21 leaders from government, business and civil society in 11 countries across ... U.S. this fall, engaging in a transformative exchange of knowledge and ideas with the ...
(Date:6/23/2017)... ... June 23, 2017 , ... Ross Insurance ... With the Federal Emergency Management Agency’s (FEMA) recent update of flood zones, more ... 2012, the Biggert-Waters Act was enacted to reflect the actual risk in flood ...
(Date:6/23/2017)... ... June 23, 2017 , ... The Katyl Agency, ... to families and business owners in and around Lackawanna County, is joining Meals ... in the area. , Meals on Wheels of NEPA provides hand-delivered and nutritious ...
(Date:6/23/2017)... ... June 23, 2017 , ... Radabaugh & Associates, a locally ... business owners in North Central West Virginia, is embarking on a cooperative charity ... residents in the region. , The Stepping Stones organization offers a series of ...
(Date:6/22/2017)... ... June 22, 2017 , ... Plastic Surgery Associates is proud to report ... 2017. Each year, research and information firm, Castle Connolly, releases their list of the ... this marks the 3rd time that Dr. Canales has been recognized by ...
Breaking Medicine News(10 mins):
(Date:6/8/2017)... , June 8, 2017  Less than a ... hit more than 200,000 companies, including hospital networks, in ... heralded as one of the largest online extortion attempts ... the healthcare market, it is imperative that providers understand ... their data from this — and many other very ...
(Date:6/7/2017)... 6, 2017  Diplomat Specialty Infusion Group, a brand of Diplomat ... its Iowa location. The ... now features an ISO 7 cleanroom—the standard needed to compound intravenous ... low level of pollutants. "Our ... and better serve our Iowa patients," said ...
(Date:6/1/2017)... BELL, Pa. , June 1, 2017 ... (PRN) and Veterinarian Recommended Solutions (VRS), and KD Pharma ... investment in Nutriceutical Holdings by KD Pharma Group. KD ... Holdings with the option to acquire the entire company. ... partner in KD. They are committed to growing the ...
Breaking Medicine Technology: