{"id":5457,"date":"2017-01-20T17:15:18","date_gmt":"2017-01-20T22:15:18","guid":{"rendered":"https:\/\/joinastudy.ca\/?p=5457"},"modified":"2018-08-09T14:06:18","modified_gmt":"2018-08-09T18:06:18","slug":"alzheimers-hereditary-risk","status":"publish","type":"post","link":"https:\/\/joinastudy.ca\/fr\/alzheimers-hereditary-risk\/","title":{"rendered":"Alzheimer&rsquo;s: Hereditary Risk and Genetic Testing"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Alzheimer&rsquo;s disease (AD) is an irreversible neurodegenerative disease that causes dementia. Some of the first warning signs may include forgetfulness, lapses in judgement, and confusion. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Vision changes, social withdrawal, mood changes, memory loss, and difficulty planning, problem solving, completing routine tasks and recognizing people are other <a href=\"http:\/\/www.webmd.com\/alzheimers\/guide\/early-warning-signs-when-to-call-the-doctor-about-alzheimers#1\">early-stage symptoms<\/a><\/span><span style=\"font-weight: 400;\">. \u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Over time, symptoms of AD tend to worsen. Though there&rsquo;s no way of knowing whether the disease will take<a href=\"https:\/\/ghr.nlm.nih.gov\/condition\/alzheimer-disease#definition\">\u00a0one year or twenty to run its course<\/a>, most AD patients eventually need help with everyday tasks such as personal hygiene, dressing, eating, and drinking<\/span><span style=\"font-weight: 400;\">. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trying to support a parent or relative who&rsquo;s suffering from Alzheimer&rsquo;s disease is never easy. But for many people, it also triggers a worrisome question. Does having a\u00a0relative who has Alzheimer&rsquo;s mean you&rsquo;re at risk, too?<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Is Alzheimer&rsquo;s Disease Hereditary?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In order to answer that question, it&rsquo;s crucial to first understand that there are two types of AD: early-onset and late-onset. Symptoms of early-onset AD usually appear <a href=\"https:\/\/ghr.nlm.nih.gov\/condition\/alzheimer-disease#genes\">before the age of 65<\/a>, while symptoms of late-onset AD appear among those over 65 years of age<\/span><span style=\"font-weight: 400;\">. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">But early-onset Alzheimer&rsquo;s is much rarer than late-onset Alzheimer&rsquo;s\u2014it accounts for <a href=\"https:\/\/ghr.nlm.nih.gov\/condition\/alzheimer-disease#genes\">only 5% of all cases<\/a><\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><strong>Early-Onset Alzheimer&rsquo;s Disease<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Most, but not all, cases of the early-onset form of AD are caused by a genetic mutation that can be passed from parents to their children. When a parent has this genetic mutation, half of his or her offspring are likely to have it, too. Therefore, this form of the illness tends to\u00a0<a href=\"https:\/\/ghr.nlm.nih.gov\/condition\/alzheimer-disease\">run in families<\/a>. \u00a0<\/span><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-5460\" src=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_2-300x169.jpg\" alt=\"Alzheimer disease hereditary\" width=\"300\" height=\"169\" srcset=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_2-300x169.jpg 300w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_2-768x432.jpg 768w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_2.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The gene mutation that results in early-onset AD changes the way that a toxic protein called beta amyloid is produced or eliminated in the brain. These changes can lead to a buildup of beta amyloid plaques, which are sometimes described as clusters or tangles. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is one of the main characteristics of both early- and late-onset forms of AD. A build-up of beta amyloid and amyloid plaques appears to cause nerve cell death, which results in the\u00a0symptoms of the illness. <\/span><\/p>\n<p><strong>Late-Onset Alzheimer&rsquo;s Disease<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">More commonly, signs and symptoms of AD begin to appear in individuals over the age of 65. Though scientific evidence has suggested that the disease may be present years before clinical symptoms appear, this form of <a href=\"http:\/\/www.brightfocus.org\/alzheimers\/article\/what-your-risk-heredity-and-late-onset-alzheimers-disease\">AD is still known as late-onset<\/a><\/span><span style=\"font-weight: 400;\">. \u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-5461\" src=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_3-300x200.jpg\" alt=\"Alzheimer disease hereditary\" width=\"300\" height=\"200\" srcset=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_3-300x200.jpg 300w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_3-272x182.jpg 272w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_3.jpg 500w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Genetically speaking, the likelihood of inheriting late-onset AD from an affected parent is<a href=\"https:\/\/ghr.nlm.nih.gov\/condition\/alzheimer-disease#definition\"> much lower than the risk of inheriting early-onset AD<\/a><\/span><span style=\"font-weight: 400;\">. Still, late-onset AD does\u00a0have a genetic component. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Having a first-degree relative with late-onset Alzheimer&rsquo;s may increase your likelihood of developing the disease later on in life. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">According to research, a 65-year-old person has a one in 10 chance of having AD by age 87. However, a 65-year-old with a parent or sibling who has late-onset AD is <a href=\"http:\/\/www.brightfocus.org\/alzheimers\/article\/what-your-risk-heredity-and-late-onset-alzheimers-disease\">five times more likely to develop<\/a> late-onset AD by age 87 than someone who does not have an affected parent or sibling.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Why Is Inheritance Of The 2 Forms Of AD Different?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">If the two forms of AD share the same clinical symptoms, why aren&rsquo;t they inherited in the same way? <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The gene mutations that can cause early-onset AD are <a href=\"https:\/\/ghr.nlm.nih.gov\/condition\/alzheimer-disease#definition\">autosomal <span style=\"text-decoration: underline;\">dominant<\/span> genes<\/a>. \u00a0This means that if a person receives a\u00a0mutated gene from their parent with early-onset AD, and a normal gene from their other parent, the mutated gene will dominate resulting in early-onset AD. The chances of receiving a mutated gene from a parent with early-onset AD is 50% because one of the two\u00a0copies of the parent&rsquo;s genes contains a mutation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">On the other hand, when it comes to late-onset AD, <a href=\"https:\/\/ghr.nlm.nih.gov\/condition\/alzheimer-disease#definition\">the causes are less clear<\/a>. This form of AD is probably related to variations in one or more genes that increases the\u00a0risk to some degree\u00a0in combination with lifestyle and environmental factors. There appears to be no single gene mutation in the autosomal dominant pattern that consistently causes the disease. Current research into late-onset AD is focused on the search for other genes which may be involved in triggering the disease.\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-5462\" src=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_4-300x300.jpg\" alt=\"Alzheimer disease hereditary\" width=\"300\" height=\"300\" srcset=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_4-300x300.jpg 300w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_4-150x150.jpg 150w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_4.jpg 500w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Ethnicity, lifestyle, environmental factors, traumatic brain injury and other medical diseases are factors which can also contribute to a person&rsquo;s overall risk of developing AD<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Should You Get Tested? <\/b><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-5463\" src=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_5-300x200.jpg\" alt=\"Alzheimer disease hereditary\" width=\"300\" height=\"200\" srcset=\"https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_5-300x200.jpg 300w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_5-272x182.jpg 272w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_5-768x512.jpg 768w, https:\/\/joinastudy.ca\/wp-content\/uploads\/ADHereditary_5.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Testing for genetic factors linked to AD is available to the public. But current tests can&rsquo;t conclusively tell patients whether they will get Alzheimer&rsquo;s in the future, and if so, when. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">According to <a href=\"http:\/\/www.webmd.com\/news\/breaking-news\/confronting-alzheimers\/20160225\/alzheimers-risk?page=1\">Dr. Liana Apolostova<\/a>, a professor who specializes in Alzheimer&rsquo;s research at the Indiana University School of Medicine, \u00ab\u00a0You can get the ApoE<\/span><span style=\"font-weight: 400;\">4 test at your doctor&rsquo;s office, but I and many of my colleagues rarely offer it, because we don&rsquo;t have any treatments to offer if we determine that patients are at a higher risk.\u00a0\u00bb<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Other specialists disagree. They believe that genetic tests could inspire at-risk patients to focus on lifestyle factors\u2014including diet, physical activity, and social connectedness, among others\u2014in order to <a href=\"http:\/\/www.brightfocus.org\/alzheimers\/diet-and-exercise\">improve brain health<\/a><\/span><span style=\"font-weight: 400;\">. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ultimately, it&rsquo;s up to the individual to decide whether they want genetic testing, and if so, what they&rsquo;ll do with the test information when they receive it.<\/span><\/p>\n<p>Find out more about the <a href=\"https:\/\/joinastudy.ca\/alzheimer-warning-signs\/\">early warning signs of Alzheimers Disease<\/a> and stay informed.<\/p>\n<p><i>The information in this article should not be taken as professional medical advice. If you are having issues or have health-related concerns, you should see your personal physician.<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Alzheimer&rsquo;s disease (AD) is an irreversible neurodegenerative disease that causes dementia. Some of the first warning signs may include forgetfulness, lapses in judgement, and confusion. Vision changes, social withdrawal, mood changes, memory loss, and difficulty planning, problem solving, completing routine tasks and recognizing people are other early-stage symptoms. \u00a0 Over time, symptoms of AD tend<\/p>\n","protected":false},"author":45,"featured_media":5459,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[600,513],"tags":[435,443,445,369],"class_list":["post-5457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alzheimers-dementia","category-health-and-wellness","tag-alzheimers-dementia","tag-alzheimer-disease","tag-alzheimer-hereditary","tag-health-and-wellness-tips","category-600","category-513","description-off"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Alzheimer&#039;s: Hereditary Risk and Genetic Testing - JoinAStudy.ca<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/joinastudy.ca\/fr\/alzheimers-hereditary-risk\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Alzheimer&#039;s: Hereditary Risk and Genetic Testing\" \/>\n<meta property=\"og:description\" content=\"Alzheimer&rsquo;s disease (AD) is an irreversible neurodegenerative disease that causes dementia. 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