Concept

Adenosine monophosphate deaminase deficiency type 1

Summary
Adenosine monophosphate deaminase deficiency type 1 or AMPD1, is a human metabolic disorder in which the body consistently lacks the enzyme AMP deaminase, in sufficient quantities. This may result in exercise intolerance, muscle pain and muscle cramping. The disease was formerly known as myoadenylate deaminase deficiency (MADD). In virtually all cases, the deficiency has been caused by an SNP mutation, known as rs17602729 or C34T. While it was initially regarded as a recessive (or purely homozygous) disorder, some researchers have reported the existence of similarly deleterious effects from the heterozygous form of the SNP. In the homozygous form of the mutation, a single genetic base (character) has been changed from cytosine ("C") to thymine ("T") on both strands of Chromosome 1 – in other words, "C;C" has been replaced by "T;T". A rarer but analogous condition, in which two guanine bases ("G;G") bases (in the unmutated form) have been changed to adenine ("A;A") has also been identi
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