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Identification of a frequent pseudodeficiency mutation in the fumarylacetoacetase gene, with implications for diagnosis of tyrosinemia type I.

Abstract：

:In healthy individuals, fumarylacetoacetase (FAH) activities close to the range found in hereditary tyrosinemia type 1 (HT1) patients indicated the existence of a "pseudodeficiency" allele. In an individual homozygous for pseudodeficiency of FAH and in three HT1 families also carrying the pseudodeficiency allele, western blotting of fibroblast extracts showed that the pseudodeficiency allele gave very little immunoreactive FAH protein, whereas northern analysis revealed a normal amount of FAH mRNA. Sequencing revealed an identical mutation, C1021-->T (Arg341Trp), in all the pseudodeficiency alleles. Site-directed mutagenesis and expression in a rabbit reticulocyte lysate system demonstrated that the C1021-->T mutation gave reduced FAH activity and reduced amounts of the full-length protein. Bs1EI restriction digestion of PCR products distinguished between the normal and the mutated sequences. Among 516 healthy volunteers of Norwegian origin, the C1021-->T mutation was found in 2.2% of the alleles. Testing for the C1021-->T mutation may solve the problem of prenatal diagnosis and carrier detection in families with compound heterozygote genotypes for HT1 and pseudodeficiency.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Rootwelt H,Brodtkorb E,Kvittingen EA

subject

Has Abstract

pub_date

1994-12-01 00:00:00

pages

1122-7

issue

6

eissn

0002-9297

issn

1537-6605

journal_volume

55

pub_type

杂志文章

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