Gene doubles Alzheimer’s risk in African Americans

04/2013

A study involving nearly 6,000 African American older adults has found those with a specific gene variant have almost double the risk of developing late-onset Alzheimer’s disease compared with African Americans who lack the variant. The size of the effect is comparable to that of the ‘Alzheimer’s gene’, APOE-e4.

The gene (ABCA7) is involved in the production of cholesterol and lipids. It also affects the transport of several important proteins, including amyloid precursor protein, which is involved in the production of amyloid-beta.

The finding suggests that lipid metabolism may be a more important pathway in Alzheimer’s disease in African Americans than in whites. Cholesterol and lipid imbalances are more common in African Americans.

The gene does not seem to be a significant risk factor for whites, adding more weight to the idea that there are multiple pathways to the disease, and showing that the genetic underpinnings may vary among different populations (although it should be noted that other genes linked to Alzheimer’s risk in white populations were also significant for this group).

http://www.futurity.org/health-medicine/gene-tied-to-double-alzheimers-risk-in-african-americans/

[3364] Reitz C, J. G.
(2013).  VAriants in the atp-binding cassette transporter (abca7), apolipoprotein e ϵ4,and the risk of late-onset alzheimer disease in african americans.
JAMA. 309(14), 1483 - 1492.

Related News

Growing research has implicated infections as a factor in age-related cognitive decline, but these have been cross-sectional (comparing different individuals, who will have a number of other, possibly confounding, attributes).

Another study adds to the growing evidence that a Mediterranean diet is good for the aging brain.

A two-year study which involved metabolic testing of 50 people, suggests that Alzheimer's disease consists of three distinct subtypes, each one of which may need to be treated differently. The finding may help explain why it has been so hard to find effective treatments for the disease.

A study involving both mice and human cells adds to evidence that stress is a risk factor for Alzheimer's.

Data from 23,572 Americans from the Reasons for Geographic and Racial Differences in Stroke (REGARDS) study has revealed that those who survived a stroke went on to have significantly faster rates of cognitive decline as they aged.

A study involving 382 older adults (average age 75) followed for around five years, has found that those who don’t get enough vitamin D may experience cognitive decline at a much faster rate than people who have adequate vitamin D.

Training in a mental imagery technique has been found to help multiple sclerosis patients in two memory domains often affected by the disease: autobiographical memory and episodic future thinking.

A study involving 218 participants aged 18-88 has looked at the effects of age on the brain activity of participants viewing an edited version of a 1961 Hitchcock TV episode (given that participants viewed the movie while in a MRI machine, the 25 minute episode was condensed to 8 minutes).

A study involving 100 healthy older adults (aged 60-80) has found that those with higher levels of physical activity showed more variable spontaneous brain activity in certain brain regions (including the

A ten-year study involving 2,092 older adults (average age 76) has found that people tended to lose awareness of memory problems two to three years before the onset of dementia.

Pages

Subscribe to Latest newsSubscribe to Latest newsSubscribe to Latest health newsSubscribe to Latest news