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Alzheimer's Disease Genetics Fact Sheet

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Alzheimer's Disease Genetics Fact Sheet Alzheimer’s Disease Genetics FACT SHEET cientists don’t yet fully In other diseases, a genetic variant understand what causes may occur. This change in a gene can SAlzheimer’s disease. How- sometimes cause a disease directly. ever, the more they learn about More often, it acts to increase or this devastating disease, the more decrease a person’s risk of develop- they realize that genes* play an ing a disease or condition. When a important role in its development. genetic variant increases disease risk Research conducted and funded but does not directly cause a disease, by the National Institute on Aging it is called a genetic risk factor. (NIA) at the National Institutes of Health and others is advancing Alzheimer’s Disease Genetics the field of Alzheimer’s disease genetics. Alzheimer’s disease is an irreversible, progressive brain disease. It is charac- terized by the development of amyloid The Genetics of Disease plaques and neurofibrillary tangles, the loss of connections between nerve Some diseases are caused by a cells, or neurons, in the brain, and genetic mutation, or permanent the death of these nerve cells. There change in one or more specific are two types of Alzheimer’s—early- genes. If a person inherits from onset and late-onset. Both types have a parent a genetic mutation that a genetic component. causes a certain disease, then he or she will usually get the disease. Early-Onset Alzheimer’s Disease Sickle cell anemia, cystic fibrosis, and early-onset familial Alzheimer’s Early-onset Alzheimer’s disease disease are examples of inherited occurs in people age 30 to 60. It is genetic disorders. rare, representing less than 5 percent *Terms in bold are defined at the end of this fact sheet. Alzheimer’s Disease Education and Referral Center of all people who have Alzheimer’s. the formation of abnormal amyloid Some cases of early-onset Alzheimer’s precursor protein (APP). A mutation have no known cause, but most cases on chromosome 14 causes abnormal are inherited, a type known as familial presenilin 1 to be made, and a Alzheimer’s disease (FAD). mutation on chromosome 1 leads to abnormal presenilin 2. Familial Alzheimer’s disease is caused by any one of a number of Scientists know that each of these different single-gene mutations mutations plays a role in the break- on chromosomes 21, 14, and 1. down of APP, a protein whose precise Each of these mutations causes function is not yet known. This abnormal proteins to be formed. breakdown is part of a process that Mutations on chromosome 21 cause generates harmful forms of amyloid DNA, Chromosomes, and Genes The nucleus of almost every Cell Nucleus human cell contains a “blueprint” Cell 23 Pairs of that carries the instructions a Chromosomes Chromosome cell needs to do its job. The Genes Pair blueprint is made up of DNA (deoxyribonucleic acid), which is present in long strands that would stretch to nearly 6 feet in length if attached end to end. The DNA DNA Strand is packed tightly together with proteins into compact structures called chromosomes. Normally, each cell has 46 chromosomes in 23 pairs, which are inherited equally from a father and a mother. The DNA in nearly all cells of an individual is identical. Each chromosome contains many thousands of segments, called genes. People inherit two copies of each gene from their parents, except for genes on the X and Y chromosomes, which, among other functions, determine a person’s sex. The genes “instruct” the cell to make unique proteins that, in turn, dictate the types of cells made. Genes also direct almost every aspect of the cell’s construction, operation, and repair. Even slight changes in a gene can produce a protein that functions abnormally, which may lead to disease. Other changes in genes may increase or decrease a person’s risk of developing a particular disease. 2 plaques, a hallmark of the disease. Late-Onset Alzheimer’s Disease A child whose mother or father carries a genetic mutation for FAD Most cases of Alzheimer’s are the has a 50/50 chance of inheriting late-onset form, which develops that mutation. If the mutation is after age 60. The causes of late-onset inherited, the child almost surely Alzheimer’s are not yet completely will develop FAD. understood, but they likely include a combination of genetic, environ- Critical research findings about mental, and lifestyle factors that early-onset Alzheimer’s have helped influence a person’s risk for develop- identify key steps in the formation ing the disease. of brain abnormalities typical of Alzheimer’s disease. They have also The single-gene mutations directly led to the development of imaging responsible for early-onset Alzheimer’s tests that show the accumulation of disease do not seem to be involved in amyloid and tau in the living brain. late-onset Alzheimer’s. Researchers In addition, the study of Alzheimer’s have not found a specific gene that genetics has helped explain some causes the late-onset form of the of the variation in the age at which disease. However, one genetic risk the disease develops. factor does appear to increase a person’s risk of developing the disease. NIA-supported scientists are This increased risk is related to the continuing this research through apolipoprotein E (APOE) gene the Dominantly Inherited Alzheimer found on chromosome 19. APOE Network (DIAN), an international contains the instructions for making partnership to study families with a protein that helps carry cholesterol a genetic mutation that causes and other types of fat in the blood- early-onset Alzheimer’s disease. By stream. APOE comes in several observing the biological changes that different forms, or alleles. Three occur in these families long before forms—APOE e2, APOE e3, and symptoms appear, scientists hope to gain insight into how and why the APOE e4—occur most frequently. disease develops in both its early- and late-onset forms. In addition, n APOE e2 is relatively rare and scientists are attempting to develop may provide some protection tests that will enable diagnosis of against the disease. If Alzheimer’s Alzheimer’s before clinical signs and disease occurs in a person with symptoms appear, as it is likely that this allele, it develops later in life early treatment will be critical as than it would in someone with the therapies become available. APOE e4 gene. 3 n APOE e3, the most common allele, identified a number of genes in is believed to play a neutral role addition to APOE e4 that may in the disease—neither decreasing increase a person’s risk for late- nor increasing risk. onset Alzheimer’s, including BIN1, CLU, PICALM, and CR1. Finding n APOE e4 is present in about 10 to genetic risk factors like these helps 15 percent of the population and scientists better understand how in about 40 percent of all people Alzheimer’s disease develops and with late-onset Alzheimer’s. People identify possible treatments to study. who develop Alzheimer’s are more likely to have an APOE e4 allele than people who do not develop Genetic Testing the disease. Although a blood test can identify Dozens of studies have confirmed which APOE alleles a person has, that the APOE e4 allele increases it cannot predict who will or will the risk of developing Alzheimer’s, not develop Alzheimer’s disease. but how that happens is not yet It is unlikely that genetic testing understood. These studies also help will ever be able to predict the explain some of the variation in the disease with 100 percent accuracy age at which Alzheimer’s disease because too many other factors develops, as people who inherit may influence its development one or two APOE e4 alleles tend to and progression. develop the disease at an earlier age than those who do not have any At present, APOE testing is used in APOE e4 alleles. research settings to identify study participants who may have an in- APOE e4 is called a risk-factor gene creased risk of developing Alzheimer’s. because it increases a person’s risk This knowledge helps scientists look of developing the disease. However, for early brain changes in participants inheriting an APOE e4 allele does and compare the effectiveness of not mean that a person will definitely treatments for people with different develop Alzheimer’s. Some people APOE profiles. Most researchers with one or two APOE e4 alleles believe that APOE testing is useful never get the disease, and others who for studying Alzheimer’s disease risk develop Alzheimer’s do not have any in large groups of people but not APOE e4 alleles. for determining any one person’s specific risk. Using a relatively new approach called genome-wide association In doctors’ offices and other clinical study (GWAS), researchers have settings, genetic testing is used for 4 Epigenetics: Nature Meets Nurture Scientists have long thought that genetic and environmental factors interact to influence a person’s biological makeup, including the predisposition to different diseases. More recently, they have discovered the biological mechanisms for those interactions. The expression of genes (when particular genes are “switched” on or off) can be affected—positively and negatively—by environmental factors, such as exercise, diet, chemicals, or smoking, to which an individual may be exposed, even in the womb. Epigenetics is an emerging frontier of science focused on how and when particular genes are expressed. Diet and exposure to chemicals in the environment, among other factors, throughout all stages of life can alter a cell’s DNA in ways that affect the activity of genes.
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