Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Region of DNA strongly associated with Alzheimer’s disease

11.01.2006


An international team of researchers, led by investigators at Washington University School of Medicine in St. Louis, are zeroing in on a gene that increases risk for Alzheimer’s disease. They have identified a region of chromosome 10 that appears to be involved in risk for the disease that currently affects an estimated 4.5 million Americans.



"There are a few genes that have been implicated in the development of early-onset Alzheimer’s disease, but other than APOE, no genes have been found that increase risk for the more common, late-onset form of the disease," says principal investigator Alison M. Goate, D. Phil., the Samuel and Mae S. Ludwig Professor of Genetics in Psychiatry at Washington University. "The region of DNA identified in our study showed evidence of replication in four independent series of experiments. I haven’t seen a putative risk factor show such consistent results since the e4 variant of the APOE gene was identified as a risk factor for late-onset Alzheimer’s disease more than 10 years ago."

In the January issue of the American Journal of Human Genetics, Goate’s team of researchers reports results of a scan of more than 1,400 single-nucleotide polymorphisms (SNPs) on chromosome 10 to home in on susceptibility genes for late-onset Alzheimer’s disease.


A SNP is an area of DNA where a change has occurred. A strand of DNA consists of four chemical bases, or nucleotides, represented by the letters A, C, G and T. When several regions of DNA from a population are compared, sites where variations exist may be found. Some individuals will have the original base, and others will have a variant. That site where a difference can be identified is called a single nucleotide polymorphism, or SNP.

Since most DNA does not make proteins, the majority of SNPs have no effect on DNA function or on health and disease. However, some SNP variants can cause major health problems. An example is APOE4, a common SNP in the apolipoprotein E gene that increases risk for Alzheimer’s disease.

Goate and colleagues have not yet isolated a gene on chromosome 10, but in studying the 1,400 SNPs on chromosome 10 in DNA from three series, each with approximately 400 people with late-onset Alzheimer’s disease and 400 healthy, age-matched controls, her team found only one SNP that consistently showed evidence of risk for Alzheimer’s disease in all three series.

"The region of DNA implicated in our study contains six genes," Goate says. "We don’t know which of those genes is most likely to harbor this particular risk factor for Alzheimer’s disease, but we’re getting closer. We’re now trying to nail down which one of these six genes is the most likely to be involved."

Goate expects between five and 10 genes eventually will be implicated as possible risk factors for late-onset Alzheimer’s disease, and she says it’s possible that more than one of those genes is located on chromosome 10.

"One thing we’re trying to do at a functional level is to see whether any of the six genes that we’ve identified might be involved in pathways that we already know are related to Alzheimer’s disease," she says. "For example, we know amyloid-beta peptide plays a role, so we want to see whether any of these genes might have a role in amyloid-beta metabolism.

"We don’t really know the nature of this risk factor yet. What we can say is that we believe we know where it’s located, and we know there are six genes in that region. But there also could be other regulatory elements within that strand of DNA that don’t directly produce a protein but may somehow affect proteins produced elsewhere in the genome. At this point, we can say that there is a variant in this region of DNA that is increasing risk for Alzheimer’s disease, but we can’t yet say how," Goate says.

Jim Dryden | EurekAlert!
Further information:
http://www.wustl.edu

More articles from Life Sciences:

nachricht Nanoparticle Exposure Can Awaken Dormant Viruses in the Lungs
16.01.2017 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

nachricht Cholera bacteria infect more effectively with a simple twist of shape
13.01.2017 | Princeton University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

Im Focus: Newly proposed reference datasets improve weather satellite data quality

UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration

"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...

Im Focus: Repairing defects in fiber-reinforced plastics more efficiently

Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.

Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Multiregional brain on a chip

16.01.2017 | Power and Electrical Engineering

New technology enables 5-D imaging in live animals, humans

16.01.2017 | Information Technology

Researchers develop environmentally friendly soy air filter

16.01.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>