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Is Alzheimer's hereditary? The influence of genetics on disease.

06 Mar 2023
¿Es hereditario el Alzheimer? La influencia de la genética en la enfermedad.

Alzheimer's is a neurodegenerative disease that affects millions of people around the world. Symptoms include problems with memory, thinking, and behavior, and can worsen over time to the point of seriously affecting a person's ability to carry out daily activities. Because of the prevalence of this disease, family members of people with Alzheimer's understandably wonder if it runs in families. In this article, we will discuss the different types of Alzheimer's and their relationship to genetics.

To begin with, it's important to note that there are two main types of genetic influences that have been identified in relation to Alzheimer's. The first is "familial" Alzheimer's, which occurs due to a mutation in a single gene that is passed from parent to child. This type of Alzheimer's is relatively rare and only accounts for about 5-10% of all Alzheimer's cases.

The second type is "sporadic" Alzheimer's, which is much more common and affects the vast majority of people with Alzheimer's. This type of Alzheimer's is not caused by a single genetic mutation, but rather occurs as a result of a combination of genetic and environmental factors.

In the case of familial Alzheimer's, the mutation in the disease-causing gene can be identified through genetic testing. If a person inherits this mutation from one of their parents, it is very likely that they will develop the disease at some point in their lives. In some cases, this mutation can even cause the early onset of the disease, even in people under 65 years of age.

On the other hand, sporadic Alzheimer's is much more difficult to predict. Although a number of genes have been identified that may increase the risk of developing the disease, these genes do not guarantee that someone will develop Alzheimer's. In fact, even if someone inherits multiple genetic risk factors for Alzheimer's, there are still many other factors that can influence their chance of developing the disease.

One of these factors is age. Alzheimer's is a disease that occurs most often in people over the age of 65, and the risk of developing the disease increases with age. Another important factor is mental activity. People who remain mentally active throughout their lives are less likely to develop Alzheimer's than those who lead sedentary or inactive lives.

Lifestyle in general can also influence the risk of developing Alzheimer's. People who eat a healthy diet, exercise regularly, and avoid habits such as smoking and excessive alcohol consumption are less likely to develop the disease. In addition, it has been shown that controlling other health factors, such as diabetes and high blood pressure, can also reduce the risk of developing Alzheimer's.

That said, it's important to remember that even people who lead healthy lifestyles and stay mentally active can still develop Alzheimer's. The disease is complex and multifactorial, and there is still much we don't know about its underlying causes.

In summary, Alzheimer's is a disease that occurs as a result of a combination of genetic and environmental factors, and while genetics play an important role, it is not the only factor that influences the risk of developing the disease. Although familial Alzheimer's is hereditary and is passed from parent to child, it accounts for a small proportion of all Alzheimer's cases.

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