Cited by 95Metabolism and Genetic DisordersAmino Acid Enzymes and Metabolismmelanin and skin pigmentation

Deficiency of an enzyme of tyrosine metabolism underlies altered gene expression in newborn liver of lethal albino mice.

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Ruppert, S, Kelsey, G, Schedl, A, Schmid, E, Thies, E, Schütz, G·1992·Genes & Development

Abstract

Mice homozygous for albino deletions encompassing the locus alf/hsdr-1 die shortly after birth. Lethality is thought to be the consequence of hypoglycemia, which results from the failure to activate hormone-dependent genes in liver and kidney encoding enzymes important for gluconeogenesis. Within the region in which alf/hsdr-1 has been defined by physical mapping, we identified the gene encoding fumarylacetoacetate hydrolase (FAH), an enzyme of tyrosine metabolism. Lack of FAH activity should lead to accumulation of toxic tyrosine metabolites. In man, genetically determined FAH deficiency is the primary defect in tyrosinemia type I, a fatal liver disease of infants. Northern blot and in situ hybridization analysis of mouse tissues showed that the cell types that normally express FAH correspond to those that exhibit a phenotype in alf/hsdr-1 deletion mice. Moreover, we could mimic aspects of the alf/hsdr-1 deletion phenotype in vitro by treating primary hepatocyte cultures with an intermediate of tyrosine metabolism. These findings strongly suggest that alf/hsdr-1 encodes FAH and that absence of FAH is responsible for neonatal lethality in albino deletion mice. Mechanisms by which this metabolic defect might bring about alterations in gene expression characteristic of the alf/hsdr-1 deletion phenotype are discussed.

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Crossref · 10.1101/gad.6.8.1430

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Authors
Ruppert, S., Kelsey, G., Schedl, A., Schmid, E., Thies, E., & Schütz, G.
Affiliations
German Cancer Research Center (DE)
Venue
Genes & Development
Published
1992-08
Volume
6
Issue
8
Pages
1430-1443
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2146017235
Cited by
95
References
74
Citations by year
2025: 1 · 2022: 2 · 2021: 2 · 2020: 1 · 2019: 4 · 2018: 3 · 2017: 5 · 2016: 1 · 2015: 1 · 2014: 3 · 2013: 1 · 2012: 1
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Case Western Reserve University
  • Deutsche Forschungsgemeinschaft (SFB229)
  • Leibniz-Gemeinschaft
  • Oak Ridge National Laboratory
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
Keywords
fumarylacetoacetate hydrolase, tyrosine metabolism, tyrosinemia type I, neonatal lethality, hypoglycemia, gluconeogenesis, gene expression regulation, hepatocytes, enzyme deficiency
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, Cells, Cultured, Homozygote, Hydrolases, Liver, Mice, Inbred Strains, Molecular Sequence Data, Nucleic Acid Hybridization, Phenotype, Tyrosine, Blotting, Southern, Blotting, Northern, DNA Probes, Gene Expression, Mice

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