![]() Down syndrome patients also show an increased incidence of congenital heart disease and Hirschsprung’s disease.īecause the confirmation of trisomy 22 was only recently confirmed for Kanako, it’s not entirely clear how this condition has affected her development. ![]() The rest of the body can also be perturbed due to the dosage imbalance of an extra 21 chromosome, including clubbed digits, curved pinkie, wide 1-2 toe gap, and shortened stature. In fact, trisomy 21 is the most frequent genetic cause of mental retardation. This can result in a range of cognitive impairments, such as learning and memory deficits. Down syndrome patients present with an overall smaller brain size, specifically smaller cerebellum and hippocampus. In addition, one of the most affected organs in Down syndrome is the brain. Patients with Down syndrome exhibit some craniofacial dysmorphology, such as overall reduced skull size, flat head, epicanthal folds, flat nasal bridge, and open mouth. A full extra copy of chromosome 21 is often referred to as trisomy 21. These characteristics all mirror Down syndrome in humans, which is genetic condition caused by the presence of all or part of an extra chromosome 21. Recent exams later revealed that Kanako has a third copy of chromosome 22, otherwise known as trisomy 22. In addition, she also had some heart abnormalities and underdeveloped teeth. Her eyes, for example, were crossed and at the age of one, she developed cataracts. Kanako was born in captivity at the Kumamoto Sanctuary and developed some abnormal characteristics that set her apart from other chimps. This marks only the second documented occurrence of this condition in a chimpanzee. ![]() Japanese scientists have confirmed the diagnosis of Down syndrome in a 24-year-old female chimp named Kanako. ![]()
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