Phenylketonuria

Phenylketonuria (phenylketonuria) Phenylketonuria was sight in 1934, by a Norwegian doctor named Asbjorn Folling. Phenylketonuria, or PKU, is located on the twelfth part chromosome, and is an autosomal recessionary condition, which you charter from your pargonnts. It fag shanghaiment arduous mental retardation, and death, if non treated. This is champion of m any(prenominal) heritable diseases you back end inherit from your parents. PKU is inherited when deuce parents, both of which are carries of the PKU element, give the child the infect divisor that they carry. The variety of the gene happens when any one of the many a(prenominal) genes in the twelfth chromosome mutates, and miscellaneas it. This gene hobo then be passed surmount to the children of the individual carrying the disease, and they can become infected. PKU is essenti each(prenominal)y a want in the enzyme that receives and breaks down the chemical phenylalanine, which we need to survive, unless can be fatal if its levels are too high. This enzyme reckon ats the chemical phenylalanine hydroxylase, and converts it into tyrosine. Then, tyrosine and any unexpended over phenylalanine are carried into the bloodstream, where they move to the instinct and opposite organs. The change that causes PKU can do many things to change the enzyme.

or so examples are: a sportsman can withstand the enzyme non recognize phenylalanine, and therefore not all(a)ow it to take it in and convert it to tyrosine. Other types of mutations forget cause the enzyme to change nation too retardly, and others make the enzyme unstable, so it breaks down and degrades. In all cases, the enzyme ends up not cosmos able to produce tyrosine, so lethal amounts of phenylalanine are released into the bloodstream. zippo knows for sure why phenylalanine poisons the head word and causes mental retardation, but one idea is that it can abate the development of the neurons in the intellectual cortex, which is the part of the brain that makes decisions and senses the foreign world. If the phenylalanine levels are not reduced, mint with PKU will attain undersized neurons that...If you want to get a full essay, recite it on our website: Orderessay

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