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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
A guide to Down syndrome including symptoms ... higher instances of childhood leukemia and a greater possibility of dementia in adults over 50. People with Down syndrome ... Down Syndrome Treatment.
Adults with Down syndrome often develop chronic health problems, such as severe sleep apnea, digestive disorders, thyroid conditions, and obesity. Many develop Alzheimer’s disease in middle age.
In honor of Down Syndrome Awareness Month, which happens every October, we rounded up some informative facts about the chromosomal condition.
Treatment is supportive. [2] After having one child with the condition, the risk of having a second is typically around one percent. [2] It is the second-most common condition due to a third chromosome at birth, after Down syndrome for a third chromosome 21. [4] Trisomy 18 occurs in around 1 in 5,000 live births. [3]
The first symptoms are often mistakenly attributed to aging or stress. [34] Detailed neuropsychological testing can reveal mild cognitive difficulties up to eight years before a person fulfills the clinical criteria for diagnosis of Alzheimer's disease. [35] These early symptoms can affect the most complex activities of daily living. [36]
Those with CDS symptoms typically show a later onset of their symptoms than do those with ADHD, perhaps by as much as a year or two later on average. Both groups had similar levels of learning problems and inattention, but CDS children had less externalizing symptoms and higher levels of unhappiness, anxiety/depression, withdrawn behavior, and ...
Research of Down syndrome–related genes is based on studying the genes located on chromosome 21. In general, this leads to an overexpression of the genes. [1] [2] Understanding the genes involved may help to target medical treatment to individuals with Down syndrome. It is estimated that chromosome 21 contains 200 to 250 genes. [3]