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Homocystinuria (HCU) [2] is an inherited disorder of the metabolism of the amino acid methionine due to a deficiency of cystathionine beta synthase or methionine synthase. [3] It is an inherited autosomal recessive trait, which means a child needs to inherit a copy of the defective gene from both parents to be affected.
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]
Deficiency or deregulation of the enzyme due to deficient methionine synthase reductase can directly result in elevated levels of homocysteine (hyperhomocysteinemia), which is associated with blindness, neurological symptoms, and birth defects.
Cystathionine-β-synthase, also known as CBS, is an enzyme (EC 4.2.1.22) that in humans is encoded by the CBS gene.It catalyzes the first step of the transsulfuration pathway, from homocysteine to cystathionine: [5]
A fish-like body odor can result from extreme excess consumption of TMA precursors such as choline, carnitine and betaine (usually unobtainable via regular dietary intake, it requires high levels of supplement intake). 900mg of trimethylamine, [34] 8g-20g of choline, [35] 3g of carnitine [36] or 20g betatine [37] has been known to cause ...
Vitamin B12 deficiency symptoms. In addition to weakness and fatigue, a B12 deficiency may also prompt a slew of other symptoms, depending on the severity, including: pale skin.
Dementia impacts millions of older adults, but researchers are still learning how, exactly, to prevent this devastating illness. Now, research suggests that increasing your intake of one specific ...
In the field of enzymology, a betaine-homocysteine S-methyltransferase also known as betaine-homocysteine methyltransferase (BHMT) is a zinc metallo-enzyme that catalyzes the transfer of a methyl group from trimethylglycine and a hydrogen ion from homocysteine to produce dimethylglycine and methionine respectively: [2]