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  2. Alpha-1 antitrypsin deficiency - Wikipedia

    en.wikipedia.org/wiki/Alpha-1_antitrypsin_deficiency

    Alpha-1 antitrypsin deficiency (A1AD or AATD) is a genetic disorder that may result in lung disease or liver disease. [1] Onset of lung problems is typically between 20 and 50 years of age. [ 1 ] This may result in shortness of breath , wheezing , or an increased risk of lung infections .

  3. Vitamin deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_deficiency

    Niacin deficiency is a consequence of a diet low in both niacin and the amino acid tryptophan, a precursor for the vitamin. Low plasma tryptophan is a non-specific indicator, meaning it can have other causes. The signs and symptoms of niacin deficiency start to revert within days of oral supplementation with large amounts of the vitamin. [23] [24]

  4. Hypertryptophanemia - Wikipedia

    en.wikipedia.org/wiki/Hypertryptophanemia

    Hypertryptophanemia is a rare autosomal recessive [2] metabolic disorder that results in a massive buildup of the amino acid tryptophan in the blood, with associated symptoms and tryptophanuria (-uria denotes 'in the urine'). [3] [4] Elevated levels of tryptophan are also seen in Hartnup disease, [5] a disorder of amino acid transport. [6]

  5. Pellagra - Wikipedia

    en.wikipedia.org/wiki/Pellagra

    Alterations in protein metabolism may also produce pellagra-like symptoms. An example is carcinoid syndrome, a disease in which neuroendocrine tumors along the GI tract use tryptophan as the source for serotonin production, which limits the available tryptophan for niacin synthesis. In normal patients, only one percent of dietary tryptophan is ...

  6. Tryptophan - Wikipedia

    en.wikipedia.org/wiki/Tryptophan

    Tryptophan ball and stick model spinning. Tryptophan (symbol Trp or W) [3] is an α-amino acid that is used in the biosynthesis of proteins.Tryptophan contains an α-amino group, an α-carboxylic acid group, and a side chain indole, making it a polar molecule with a non-polar aromatic beta carbon substituent.

  7. Hartnup disease - Wikipedia

    en.wikipedia.org/wiki/Hartnup_disease

    The failure of amino-acid transport was reported in 1960 from the increased presence of indoles (bacterial metabolites of tryptophan) and tryptophan in the urine of patients as part of a generalized aminoaciduria of the disease. The excessive loss of tryptophan from malabsorption was the cause of the pellagra like symptoms. From studies on ...

  8. Kynurenine pathway - Wikipedia

    en.wikipedia.org/wiki/Kynurenine_pathway

    Also known as kynureninase deficiency, this extremely rare inherited disorder is caused by the defective enzyme kynureninase which leads to a block in the pathway from tryptophan to nicotinic acid mononucleotide (NaMN). As a result, tryptophan is no longer a source of niacin, hence not producing NAD, leading to pellagra (niacin

  9. Eosinophilia–myalgia syndrome - Wikipedia

    en.wikipedia.org/wiki/Eosinophilia–myalgia...

    Eosinophilia–myalgia syndrome is a rare, sometimes fatal neurological condition linked to the ingestion of the dietary supplement L-tryptophan. [1] [2] The risk of developing EMS increases with larger doses of tryptophan and increasing age. [3]