Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Alzheimer's Disease Health Center

Font Size

New Alzheimer's Disease Gene Identified

Researchers Say Gene May Help Reveal People at Risk of Developing Alzheimer's
WebMD Health News
Reviewed by Louise Chang, MD

July 14, 2009 (Vienna, Austria) -- A newly identified gene may help predict who will develop Alzheimer's disease and the approximate age at which symptoms of the disorder will begin to appear.

The new gene, dubbed TOMM40, may be the most highly predictive gene discovered in Alzheimer's disease, according to lead researcher Allen Roses, MD, director of the Deane Drug Discovery Institute at Duke University Medical Center.

Roses should know; he discovered the variants in the ApoE gene that are associated with an increased risk for Alzheimer's disease.

The ApoE gene comes in one of three forms: ApoE2, ApoE3, and ApoE4. The ApoE4 variant is the most dangerous; it accounts genetically for 50% of late-onset cases of Alzheimer's disease. Adding in TOMM40 may help to pinpoint up to 90% of inherited cases of the disease, Roses says.

Perhaps more importantly, TOMM40 may help explain why many people with the most common version of the gene, ApoE3, also get the disease, Roses says. TOMM40 can also help predict the onset of symptoms within a five- to seven-year window among people over age 60, he tells WebMD.

The study was presented at the Alzheimer's Association 2009 International Conference on Alzheimer's Disease.

New Alzheimer's Drugs Needed

If borne out through additional research, testing for the two genes could help doctors better calculate patients' estimated disease risk and age of onset, Roses says.

Having genes that can pinpoint who will develop Alzheimer's disease before symptoms develop will be beneficial once drugs to prevent or slow the course of the disorder become available, says William Thies, PhD, chief medical and scientific officer at the Alzheimer's Association.

"But right now, without a treatment to offer, it doesn't do the clinician much good to know who is at increased risk," he tells WebMD.

ApoE4 testing has been available for some time, and it's apparent that people do not want testing in the absence of treatment, Thies says. For now, testing is most useful for drug companies who want to enroll high-risk people in clinical trials, he says.

Currently, there are 5.3 million Americans living with Alzheimer's disease, which disrupts memory, learning, and other mental functions. By 2010, there will be nearly half a million new cases each year, and by 2050, there will be nearly a million new cases annually, according to the Alzheimer's Association.

Today on WebMD

Remember your finger
When it’s more than just forgetfulness.
senior man with serious expression
Which kinds are treatable?
senior man
Common symptoms to look for.
mri scan of human brain
Can drinking red wine reverse the disease?
eating blueberries
Colored mri of brain
Close up of elderly couple holding hands
mature woman
Woman comforting ailing mother
Senior woman with serious expression