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TIAB (Title and Abstract)
Acute intermittent porphyria: novel missense mutations in the human hydroxymethylbilane synthase gene.
PURPOSE: To identify mutations in families with acute intermittent porphyria, an autosomal dominant inborn error of metabolism that results from the half-normal activity of the third enzyme in the heme biosynthetic pathway, hydroxymethylbilane synthase.
METHODS: Mutations were identified by direct solid phase sequencing.
RESULTS: Two novel missense mutations E80G and T78P and three previously reported mutations, R173W, G111R, and the splice site lesion, IVS1+1, were detected, each in an unrelated proband. The causality of the novel missense mutations was demonstrated by expression studies.
CONCLUSION: These findings provide for the precise diagnosis of carriers in these families and further expand the molecular heterogeneity of AIP.

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