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Down syndrome or Down's syndrome, 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. [1] [12] There are three types of Down syndrome, the ...
Down syndrome research. 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 ...
John Langdon Down. John Langdon Haydon Down (18 November 1828 – 7 October 1896) was a British physician best known for his description of the genetic condition now known as Down syndrome, which he originally classified in 1862. He is also noted for his work in social medicine and as a pioneer in the care of mentally disabled patients.
Turner syndrome (TS), also known as 45,X, or 45,X0, is a genetic disorder in which a person's cells have only one X chromosome or are partially missing an X chromosome (sex chromosome monosomy).
World Down Syndrome Day ( WDSD) is marked each year on March 21, [1] beginning in 2007. The 21st day of March (the 3rd month of the year) was selected to signify the uniqueness of the triplication ( trisomy) of the 21st chromosome which causes Down syndrome. The General Assembly of the United Nations has decided to observe it each year since 2012.
Impostor syndrome, also known as impostor phenomenon or impostorism, is a psychological experience of intellectual and professional infraudulence. It is "the subjective experience of perceived self-doubt in one's abilities and accomplishments compared with others, despite evidence to suggest the contrary."
He was left permanently paralyzed from the waist down. Roosevelt was diagnosed with "infantile paralysis" (paralytic polio) at the time, but his symptoms are more consistent with Guillain–Barré syndrome, which his doctors failed to consider as a diagnostic possibility. See Franklin D. Roosevelt's paralytic illness for more information.
: 228 A 2021–2022 CDC survey found that 1.3% of adults in the United States, or 3.3 million, had ME/CFS. Women are diagnosed about 1.5 to 4 times more often with ME/CFS than men. An estimated 0.2%–0.5% of children have ME/CFS, and more adolescents are affected by the illness than younger children.