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Biochemical and laboratory aspects of purine and ... - ERNDIM

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‘Xanthinuria’<br />

Xanthine oxidase deficiency:<br />

Stones: xanthine, no urate.<br />

Urine/plasma: raised xanthine, no/low urate; .<br />

Type 2 Xanthinuria (+Aldehyde oxidase defic):<br />

above + no Me2PY.<br />

MoCo deficiency (+Sulphite oxidase defic):<br />

Urine: above + sulphite, sulphocysteine.<br />

Plasma: homocysteine is v low/absent.<br />

In vitro assay: MoCo: specialist labs (Lyon).<br />

Genotyping: MoCo: at Guy’s (London);<br />

XOD gene: no common mutations (v rare!)<br />

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