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What Is The Exact Cause Of Late Onset Alzheimer’s Disease

Age Dependent Epigenetic Drift


A: The epigenetic Euclidean distance of LOAD patients compared to the epigenetic norm increases with age , whereas no significant drift could be identified for the control individuals. Circles=LOAD cases, Boxes=controls. B: Correlation between epigenetic drift and age of single CpG sites in LOAD post-mortem brain samples . Several of the sites display a significant age-dependent drift in the LOAD patients most notably in the NCSTN and DNMT1 promoter sequences.

Symptoms Of Alzheimer’s Disease

Depending on how quickly the disease progresses, Alzheimer’s usually starts with slight memory loss and confusion, eventually leading to serious cognitive impairment that affects a person’s ability to remember, reason, learn and exercise judgment.

Signs and symptoms of Alzheimer’s disease include:

  • Progressive memory loss – While everyone has occasional lapses in memory, those associated with Alzheimer’s persist and get worse. Common memory problems caused by the disease include repeating things, forgetting conversations, routinely misplacing keys or putting them in odd locations and eventually forgetting the names of family members, friends or everyday objects.
  • Difficulty performing familiar tasks – Routine tasks that used to come easily, such as cooking or balancing a checkbook, become confusing or difficult.
  • Loss of judgment – Activities that require planning or decision making become more difficult or impossible. People with Alzheimer’s have trouble solving everyday problems.
  • Personality changes – Mood swings are common in those with Alzheimer’s, as is increased stubbornness, social withdrawal, anxiety and combativeness.

As Alzheimer’s disease progresses, symptoms become more pronounced and interfere with managing daily life, including:

Bisulfite Treatment Of Genomic Dna

Bisulfite treatment was performed using a standard protocol as described by Clark and colleagues . Briefly, 500 ng genomic DNA was denatured in 0.3 M NaOH for 15 min at 37°C. After adding freshly prepared 3.5 M sodium metabisulfite and 1 mM Hydroquinone solution, samples were subjected to 4-hour incubation at 55°C under exclusion of light. The samples were then purified using Qiagen DNA purification columns . Recovered samples were desulfonated in 0.3 M NaOH for 15 min at 37°C and neutralized. DNA was precipitated overnight in ethanol at 20°C and resuspended in 50 µl buffer EB . Bisulfite treated DNA was stored at 80°C until needed.

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Treatment Of Alzheimer’s Disease

Currently there is no cure for Alzheimer’s disease. The goals of treatment are to slow the progression of the disease while supporting family and caregivers. Some medications are used to improve or stabilize symptoms. Other drugs can be used to help with behavioral symptoms, such as sleeplessness and agitation.

Because medications can have side effects and may not offer noticeable improvement, patients and caregivers should discuss the appropriateness and timing of using medications with the patient’s health care provider.

Types of drugs used to treat Alzheimer’s disease:

  • Donepezil , rivastigmine and galantamine
  • Memantine

It also may be necessary to stop taking medications suspected of making confusion worse. These drugs can include painkillers, antihistamines, sleeping pills and others. However a patient should never change or stop taking any medicines without first talking to their health care provider.

Alzheimer’s Disease Research Center

Alzheimer Project

Learn more about the types and signs of Alzheimer’s disease, as well as risk factors for developing it.

Alzheimers disease is the most common form of dementia. It affects memory, thinking and behavior and gets progressively worse over time. Developing Alzheimers disease is not a part of normal aging. The exact cause of Alzheimers disease is not known. Scientists at Wake Forest are trying to understand risk factors that lead to Alzheimers disease.

You are more likely to develop Alzheimers disease if you:

  • Are older
  • Have a close relative, such as a brother, sister or parent with Alzheimers disease
  • Have certain genes linked to Alzheimers disease

The following may also increase your risk:

  • Being female
  • Have heart and blood vessel problems due to high cholesterol or high blood pressure
  • Have diabetes
  • Have a history of head trauma

There are two types of Alzheimers disease:

Early onset Alzheimers disease: Symptoms appear before age 60. This type is much less common than late onset. It tends to get worse quickly. Early onset disease can run in families. Several genes have been identified.

Late onset Alzheimers disease: This is the most common type. It occurs in people age 60 and older. It may run in some families, but the role of genes is less clear.

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Brain Changes In Alzheimers Disease

Alzheimers disease results in distinct changes in the brain. Certain areas of the brain decrease in volume as the disease progresses. There are also characteristic deposits of proteins called beta amyloid and tau. In the past, Alzheimers disease could only be determined with an autopsy of the brain after the patient passed away. Currently, doctors and scientists can use brain imaging techniques, such as magnetic resonance imaging to measure changes in brain volume and positron emission tomography to measure changes in beta amyloid and tau deposits. Scientists at Wake Forest University use these techniques and others to study Alzheimers disease.

Researchers at the Wake Forest Alzheimers Disease Research Center are trying to understand the causes and early stages of Alzheimers disease. The goal of our research is to improve early diagnosis and intervention to improve quality of life and either slow or halt the course of the disease. Our scientists are enrolling volunteers in the Healthy Brain Study to follow participants over time, collecting cognitive data, brain images and biological samples at regular intervals to better understand brain aging and which risk factors lead to Alzheimers disease.

Ethics Approval And Consent To Participate

All procedures performed in studies involving the SATS participants were in accordance with the Helsinki Declaration. The SATS protocol and the present analysis of data from the study reported in this paper were submitted to and approved by the Regional Ethical Review Board, Lund University, Sweden . Written informed consent was obtained from all patients included in the SATS. If an individual was not able to provide consent for him/herself, consent was obtained from his/her closest relative.

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Genetic Testing For Alzheimers Disease

A blood test can tell which APOE gene you have, but the results canât predict whether youâll get Alzheimerâs. Doctors use these tests mostly for research purposes. The test can tell them who has certain risk factors so they can watch for brain changes in case the disease develops.

Doctors donât typically recommend genetic testing for late-onset Alzheimerâs because the results can be confusing and cause emotional distress. If youâre showing symptoms or have a family history, your doctor may recommend testing to help diagnose early-onset Alzheimerâs. Doctors can usually diagnose Alzheimerâs without a genetic test.

Reducing Your Risk Factors

Early Onset Alzheimer’s Disease: What Families and Patients Need to Know | UCLAMDChat

It is possible to evaluate your predisposition to develop Alzheimers disease and make lifestyle choices that reduce your risk factors. More and more evidence is emerging that proves environmental factors play a significant role in determining if the disease will develop and progress.

  • Use the Internet to do research on genetic conditions. Some useful sites are:
  • Medline Plus
  • Learn as much as you can about your family health history, especially about your siblings, parents, and grandparents.
  • Consult a genetic counselor. Genetic counselors provide information and support to families who may be at risk for a variety of inherited conditions. They identify families at risk, analyze inheritance patterns and risks of recurrence and discuss options with the family. Locate a counselor at the National Society of Genetic Counselors.
  • Have a memory screening done on a regular basis, as part of your annual physical. Many memory difficulties are due to correctable conditions, such as vitamin deficiencies or stress.
  • Consult a doctor if you are concerned about a head injury and Alzheimers.
  • Make healthy lifestyle choices. By using programs like the ARPFs 4 Pillars of Alzheimers Prevention it is possible to minimize the risk factors and prevent memory loss.
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    Reasons Rate Of Alzheimers Disease Increases With Age

    When talking about the average age for Alzheimers, it is important to discuss the reasons the illness increases with age.

    Healthy brains clear out amyloid-beta regularly. This ability tends to slow down as people grow older.

    A study from The Washington University School of Medicine shows that for people in their 30s a healthy brain will clear amyloid-beta every 4 hours.

    When a person is 80 the brain may take at least 10 hours to complete the job. This may explain the relationship between Alzheimers and age.

    Material And Neuropsychological Testing

    The instruments for neuropsychological evaluation were applied at the time of the diagnosis by two trained neuropsychologists. A standardized assessment was performed in which a sociodemographic questionnaire and an inventory of current clinical health status were firstly applied, followed by the administration of the MMSE and finally by the comprehensive neuropsychological assessment. MMSE is a widely recognized and used brief screening instrument for detecting cognitive deficits and therefore is not described in detail here. It is in paper-and-pencil format and is scored out of a possible 30 points, with higher scores indicating better cognitive performance. In this project we used the Portuguese adaptation of the MMSE . The BLAD is a comprehensive battery adapted and normalized for the Portuguese population that integrates tests with sensitivity and specificity for the explored cognitive domains and critical to outline the clinical profiles of these patients. This battery assesses the following cognitive domains: attention verbal, motor, and graphomotor initiatives verbal comprehension sentences repetition verbal and non-verbal abstraction visuo-constructional abilities calculation immediate memory working memory learning and verbal memory rightleft orientation and praxis.

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    Preventing Late Onset Alzheimers

    Similar to the cure situation of Alzheimers, there is still no sure way of preventing the development of the disease.

    Experts continue to conduct multiple studies on preventive measures, but the results are usually inconsistent.

    However, several lifestyle factors might help to reduce the risk of the illness, such as:

    Difficulty Determining Time Or Place


    Losing track of dates and misunderstanding the passage of time as it occurs are also two common symptoms. Planning for future events can become difficult since they arent immediately occurring.

    As symptoms progress, people with AD can become increasingly forgetful about where they are, how they got there, or why theyre there.

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    What Is The Exact Cause Of Late Onset Alzheimer’s Disease

    4.5/5LateOnset Alzheimer’s Diseasecauseslateonsetdisease

    According to the Alzheimer’s Association, Alzheimer’s disease affects more than 5 million people in the United States. Although it’s known to affect adults 65 years and older, up to 5 percent of those diagnosed have early onset AD. This generally means that the person diagnosed is in their 40s or 50s.

    Similarly, what is the usual age range of onset for Alzheimer’s disease? Alzheimer disease most commonly affects older adults, but it can also affect people in their 30s or 40s. When Alzheimer disease occurs in someone under age 65, it is known as early-onset Alzheimer disease. A very small number of people with Alzheimer disease have the early-onset form.

    Also to know is, what is the main cause of Alzheimer’s?

    Causes and risk factors. Like all types of dementia, Alzheimer’s is caused by brain cell death. It is a neurodegenerative disease, which means there is progressive brain cell death that happens over time. In a person with Alzheimer’s, the tissue has fewer and fewer nerve cells and connections.

    How does peanut butter detect Alzheimer’s?

    The peanut butter test is a diagnostic test which aims to detect Alzheimer’s disease by measuring subjects’ ability to smell peanut butter through each nostril. The researchers believe that people with Alzheimer’s were not able to smell the peanut butter as well through their left nostril as their right one.

    How Alzheimer’s Causes Death

    In late-stage Alzheimer’s disease, people become extremely confused and disoriented. The behavior of someone with late stage Alzheimer’s may become more agitated and restless, while other persons experience withdrawal and apathy. Sometimes, people with later stage dementia cry and call out. Eventually, they lose the ability to communicate, and they may not respond at all.

    Additionally, people in the late stages are unable to care for themselves, becoming bedbound and completely dependent on others for their activities of daily living. Their ability to be continent of bowel and bladder declines.

    Their appetite decreases as well, and eventually, they lose the ability to swallow, leading to poor nutrition and a high risk of aspiration. Aspiration, where a person’s food goes “down the wrong tube” when they swallow it, greatly increases the risk of pneumonia developing because they’re not able to fully cough and clear the food out of their esophagus and then it settles into their lungs.

    Under these difficult conditions, it’s not hard to imagine how vulnerable people with late-stage dementia become, sometimes succumbing to infections, pressure sores, and pneumonia. One study found that half of all people with dementia admitted to a hospital for pneumonia or a hip fracture died within six months of leaving the hospital.

    Other factors that impact the death rate in Alzheimer’s disease include advanced age, increased falls, and delirium.

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    What Factors Are Behind The Development Of The Disease

    Experts agree that Alzheimers is likely not the result of a single cause, but a combination of environmental, genetic, and lifestyle factors.

    For instance, a mutation of the ApoE gene is believed to increase the risk of developing Alzheimers after hitting 65 years.

    Conversely, it is not the cause of the illness. The National Institutes of Health states that ApoE is responsible for how cholesterol moves in the blood.

    Some studies suggest that individuals who have high cholesterol levels and high blood pressure are at a higher risk of developing Alzheimers.

    Recent research also suggests that viral and bacterial infections play a significant role in the development of the illness.

    Because of ongoing research, scientists are positive that soon they will be able to come up with a detailed explanation of the multiple Alzheimers causes so that people can have a better understanding of this disease.

    What Is Early Onset Familial Alzheimer Disease

    Causes of Alzheimer’s Disease

    Definition: What Is eFAD?

    Early onset familial Alzheimer disease is hereditary and marked by Alzheimer disease symptoms that appear at an unusually early age. Symptoms can start in a person’s thirties, forties, and fifties . Generally, if you are diagnosed with eFAD, then one of your parents will also have had it if he or she lived long enough, and your siblings and your children may have a 50-50 chance of having inherited it. Very rarely, eFAD can make a first-time appearance in a family through a new genetic mutation.

    Genetics researchers studied eFAD families to discover the three known genes that cause familial AD: amyloid precursor protein , presenilin-1 , and presenilin-2 . Of these, PS1 mutations account for most eFAD, while APP and PS2 are more rare. Having a pathogenic mutation in one of these three genes virtually guarantees that one will develop early onset Alzheimer disease. Tests can determine which gene is at fauly . There are also cases of eFAD that cannot be linked to one of these three genes. There may be additional genes waiting to be discovered, if only researchers could connect with more eFAD families.

    Prognosis: Is eFAD Different from LOAD?

    How Common Is Early Onset Familial Alzheimer Disease?

    For practical and research purposes, doctors and scientists need defined populations for study and the numbers change based on the definitions. The definition would seem to rest on two criteria:

    Early onset sporadic Late-onset sporadic

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    Causes Of Late Onset Alzheimers Disease

    To date, scientists and other parties involved have not been able to pinpoint the exact cause of this illness.

    The question of why some individuals get it and others do not remain a mystery.

    Researchers have not yet identified a particular gene that is behind the development of Alzheimers.

    While some say that Alzheimers is hereditary, the fact cannot be substantiated because it may or may not run in the family.

    There are instances where both parents may get the illness and their child does not end up getting it.

    Conditions That Cause Similar Symptoms

    It is also important to note that while Alzheimers is one of the most common causes of dementia, there are other conditions that can also result in similar symptoms. Other causes include dementia with Lewy bodies, frontotemporal dementia, HIV, Huntington’s disease, Parkinson’s disease, and traumatic brain injury.

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    Key Symptoms Of Alzheimers

    For both early and late-onset Alzheimers, symptoms include impaired cognitive functioning like problems with memory, a lack of judgment, and an inability to perform simple tasks. In both instances, the disease is progressive, meaning it gets worse over time. Initially, a person may just be confused, forget where they are, lose things or struggle with simple tasks. In the later stages, the disorientation is usually worse. Alzheimers patients may not recognize family members. They may have difficulty speaking, hallucinate or act unpredictably. There may also be dramatic personality and behavioral changes.

    In both instances, a brain with Alzheimers develops plaques and tangles. These are abnormal clumps of amyloid plaques and tangled bundles of tau. These areas of the brain are then compromised and lose their ability to function properly. This is especially true of the hippocampus region of the brain, which is where memory forms. In this part of the brain and other areas affected by Alzheimers, the neurons die and lose their connectivity, causing the brain to atrophy and actually shrink.

    It is estimated that 5.5 million Americans live with Alzheimers. However, there are new medications, intervention strategies, and resources for learning about the disease and coping with it.

    Genetics And Family History


    Genetics play a role in influencing ones likelihood of developing Alzheimers, but there is as yet no known definitive genetic cause.

    Alzheimers is broadly defined as either late-onset or early-onset, with each affected by different genetic components.

    Late-onset Alzheimers, which tends to affect people from their mid-60s on, has no known specific genetic cause but does associate with a variant of the apolipoprotein E gene as a possible risk factor. Although APOE is thought to increase a persons risk of developing Alzheimers, inheriting it does not mean a person will develop the condition.

    Accounting for fewer than 10% of all cases, early-onset Alzheimers tends to occur in individuals between their mid-30s and mid-60s. Some cases appear to stem from inherited changes in one of three genes: APP, presenilin 1 , and presenilin 2 . The abnormal proteins produced by mutations in these genes all affect the breakdown of the APP protein, which can lead to amyloid plaques.

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