Cri-du-chat syndrome is caused by a deletion of a part of chromosome 5. Because of this deletion, many of the genes are nonexistent in the affected person. This deletion happens because of a break in the DNA molecule during the creation of the egg or sperm. It could be, but not always is, inherited from a parent. The symptoms of cri-du-chat is having a cat-like cry as a baby, Also the affected person has distinctive facial features like a small, unusually round head. They also have many health problems such as respiratory problems, severe mental retardation, and heart defects. Doctors can detect this syndrome by an infants cat-like cry or by some of their health problems. Doctors can also detect it when the baby is still in the mothers womb. Sadly, there are no treatments for cri-du-chat, but the child can go through therapy so that they develop as normally as possible. It is also the most common syndrome that comes from a chromosomal deletion, and about 1 in 50,000 babies are affected. The life expectancy is normal if the person has no major organ defects or critical medical conditions.
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