Abstract:
BACKGROUND:Recent decades have unravelled the molecular background of a number of inborn errors of metabolism (IEM) causing vitamin B6-dependent epilepsy. As these defects interfere with vitamin B6 metabolism by different mechanisms, the plasma vitamin B6 profile can give important clues for further molecular work-up. This has so far been investigated in only a small number of patients. METHODS:We evaluated the vitamin B6 vitamers pyridoxal 5'-phosphate (PLP), pyridoxal (PL), pyridoxamine (PM), pyridoxine (PN) and the catabolite pyridoxic acid (PA) in the so far largest patient cohort: reference (n = 50); pyridox(am)ine 5'-phosphate oxidase (PNPO) deficiency (n = 6); antiquitin (ATQ) deficiency (n = 21); tissue non-specific alkaline phosphatase (TNSALP) deficiency (n = 2) and epileptic encephalopathy (EE) of unknown etiology tested negative for ATQ and PNPO deficiency (n = 64). RESULTS:High plasma PM concentration was found in all patients with PNPO deficiency irrespective of vitamin B6 supplementation. Their PM concentration and the PM/PA ratio was significantly higher (p < 0.0001), compared to any other patients analysed. One patient with TNSALP deficiency and sampling prior to PN supplementation had markedly elevated plasma PLP concentration. On PN supplementation, patients with TNSALP deficiency, ATQ deficiency and patients of the EE cohort had similar plasma vitamin B6 profiles that merely reflect the intake of supra-physiological doses of vitamin B6. The interval of sampling to the last PN intake strongly affected the plasma concentrations of PN, PL and PA. CONCLUSIONS:PM concentrations and the PM/PA ratio clearly separated PNPO-deficient patients from the other cohorts. The plasma PM/PA ratio thus represents a robust biomarker for the selective screening of PNPO deficiency.
journal_name
J Inherit Metab Disjournal_title
Journal of inherited metabolic diseaseauthors
Mathis D,Abela L,Albersen M,Bürer C,Crowther L,Beese K,Hartmann H,Bok LA,Struys E,Papuc SM,Rauch A,Hersberger M,Verhoeven-Duif NM,Plecko Bdoi
10.1007/s10545-016-9955-8subject
Has Abstractpub_date
2016-09-01 00:00:00pages
733-741issue
5eissn
0141-8955issn
1573-2665pii
10.1007/s10545-016-9955-8journal_volume
39pub_type
杂志文章abstract::The intestinal microvillar enzyme complex sucrase-isomaltase has been studied in cystic fibrosis and control ileum. A number of biochemical parameters of the enzyme in ileum homogenates have been determined. Both solubilized as well as membrane-bound sucrase-isomaltase were analyzed with respect to their reaction with...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01805427
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abstract::There is a failure of growth in hypoxanthine guanine phosphoribosyltransferase deficiency; slow weight gain is marked after the second year of age but is apparent in the birth weights of all eight of our patients for whom we have data. However, head growth and bone development are less affected than weight. A partial ...
journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1007/BF01799608
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1023/a:1005300621350
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1007/s10545-011-9359-8
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1007/BF00710053
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01800012
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-013-9625-z
更新日期:2014-01-01 00:00:00
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
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更新日期:2020-05-01 00:00:00
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journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1023/a:1005372730310
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