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Ornithine transcarbamylase deficiency also known as OTC deficiency is the most common urea cycle disorder in humans. Ornithine transcarbamylase , the defective enzyme in this disorder, is the final enzyme in the proximal portion of the urea cycle , responsible for converting carbamoyl phosphate and ornithine into citrulline .
Ornithine transcarbamylase (OTC) (also called ornithine carbamoyltransferase) is an enzyme (EC 2.1.3.3) that catalyzes the reaction between carbamoyl phosphate (CP) and ornithine (Orn) to form citrulline (Cit) and phosphate (P i). There are two classes of OTC: anabolic and catabolic.
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Carnitine deficiency is found in about 50% of cases. [18] Over 90% of those diagnosed with 3-Methylcrotonyl-CoA carboxylase deficiency by newborn screening remain asymptomatic. The medical abnormalities that present in the few who do show symptoms are not always clearly related to 3-Methylcrotonyl-CoA carboxylase deficiency. [5]
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Methylenetetrahydrofolate reductase deficiency is the most common genetic cause of elevated serum levels of homocysteine (hyperhomocysteinemia). It is caused by genetic defects in MTHFR, which is an important enzyme in the methyl cycle. [1] Common variants of MTHFR deficiency are asymptomatic and have only minor effects on disease risk. [2]
Although OTC drugs are generally regarded as safe for use without a prescription (by definition), medication errors still occur. For example, patients sometimes misuse OTC products by taking larger than recommended doses, in order to bring about symptomatic relief more quickly, or even intentionally abuse them for unlabeled indications. [ 4 ]
OTC Markets Group, a private company that provides services to the US over-the-counter securities market OTC Tool Company , originally the Owatonna Tool Company Organizations