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Second Case of ‘Down Syndrome’ in Chimps

[Source: Science Daily]

Japanese researchers have confirmed the second case known to science of a chimpanzee born with trisomy 22, a chromosomal defect similar to that of Down syndrome (or trisomy 21) in humans. The report on Kanako, a 24-year-old female chimp born into captivity, was led by Satoshi Hirata of Kyoto University in Japan, and appears in the journal Primates, published by Springer. The authors also describe their attempts to improve the quality of life of this chimpanzee, through providing and managing opportunities for normal social interaction. Such efforts are seen as key in caring for disabled chimpanzees in captivity.

Human cells normally contain 23 pairs of chromosomes, for a total of 46. Down syndrome occurs when a person’s cells contain a third copy of chromosome 21 (also known as trisomy 21). In turn, apes have 24 pairs of chromosomes, for a total of 48. Trisomy 22 is diagnosed when the cells of apes such as chimpanzees, gorillas or orangutans contain a third copy of chromosome 22.

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