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NA06330 DNA from Fibroblast

Description:

GYRATE ATROPHY OF CHOROID AND RETINA; GACR
ORNITHINE AMINOTRANSFERASE; OAT

Affected:

Yes

Sex:

Female

Age:

27 YR (At Sampling)

  • Overview
  • Characterizations
  • Phenotypic Data
  • Publications
  • External Links

Overview

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Repository NIGMS Human Genetic Cell Repository
Subcollection Heritable Diseases
Disorders of the Urea Cycle
Class Disorders of Amino Acid Metabolism
Quantity 0.050mg
Quantitation Method Please see our FAQ
Cell Type Fibroblast
Transformant Untransformed
Sample Source DNA from Fibroblast
Race White
Ethnicity ITALIAN
Relation to Proband proband
Confirmation Clinical summary/Case history
Species Homo sapiens
Common Name Human
Remarks Elevated serum & urine ornithine levels; progressive blindness; no sign of neurologic involvement; severe constrict of visual fields; flat ERG; neg family history; < 5% of norm ornithine aminotransferase act; unrespon in vitro to Vit B6; donor subject is homozygous for a C>T transition at nucleotide 677 (677C>T) in exon 7 of the OAT gene which converts alanine 226 (GCG) to valine (GTG) [Ala226Val (A226V)]

Characterizations

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Passage Frozen 3
 
IDENTIFICATION OF SPECIES OF ORIGIN Species of Origin Confirmed by Nucleoside Phosphorylase, Glucose-6-Phosphate Dehydrogenase, and Lactate Dehydrogenase Isoenzyme Electrophoresis
 
GENE MAPPING & DOSAGE STUDIES - Y CHROMOSOME PCR analysis of DNA from this cell culture gave a negative result with a primer for Yq11, DYS227.
 
ornithine aminotransferase According to the submitter, biochemical test results for this subject showed decreased enzyme activity. EC Number: 2.6.1.13; <5% activity.
 
Gene OAT
Chromosomal Location 10q26
Allelic Variant 1 258870.0038; GYRATE ATROPHY WITH PYRIDOXINE-RESPONSIVE ORNITHINEMIA
Identified Mutation ALA226VAL; In 2 unrelated patients with gyrate atrophy of the choroid and retina, Michaud et al. (1995) found a missense mutation, A226V. One patient, who was a compound for A226V and for the premature termination allele R398X, showed a significant decrease in mean plasma ornithine levels following pyridoxine supplementation with a constant protein intake. In extracts from fibroblasts of a second gyrate atrophy patient homozygous for A226V and also from Chinese hamster ovary cells expressing an OAT cDNA containing A226V, Michaud et al. (1995) found that OAT activity increased from undetectable levels to approximately 10% of normal when the concentration of pyridoxal phosphate was increased from 50 to 600 microM.
 
Gene OAT
Chromosomal Location 10q26
Allelic Variant 2 258870.0038; GYRATE ATROPHY WITH PYRIDOXINE-RESPONSIVE ORNITHINEMIA
Identified Mutation ALA226VAL; In 2 unrelated patients with gyrate atrophy of the choroid and retina, Michaud et al. (1995) found a missense mutation, A226V. One patient, who was a compound for A226V and for the premature termination allele R398X, showed a significant decrease in mean plasma ornithine levels following pyridoxine supplementation with a constant protein intake. In extracts from fibroblasts of a second gyrate atrophy patient homozygous for A226V and also from Chinese hamster ovary cells expressing an OAT cDNA containing A226V, Michaud et al. (1995) found that OAT activity increased from undetectable levels to approximately 10% of normal when the concentration of pyridoxal phosphate was increased from 50 to 600 microM.

Phenotypic Data

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Remarks Elevated serum & urine ornithine levels; progressive blindness; no sign of neurologic involvement; severe constrict of visual fields; flat ERG; neg family history; < 5% of norm ornithine aminotransferase act; unrespon in vitro to Vit B6; donor subject is homozygous for a C>T transition at nucleotide 677 (677C>T) in exon 7 of the OAT gene which converts alanine 226 (GCG) to valine (GTG) [Ala226Val (A226V)]

Publications

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Balfoort BM, Pampalone G, Ruiter JPN, Denis SW, Brands MM, GACR Bird's Eye View Consortium MM, Timmer C, Wagenmakers MAEM, Wanders RJA, van Karnebeek CD, Cellini B, Houtkooper RH, Ferdinandusse S, Extending diagnostic practices in gyrate atrophy: Enzymatic characterization and the development of an in vitro pyridoxine responsiveness assay Molecular genetics and metabolism143:108542 2024
PubMed ID: 39053126
 
Foltz LP, Clegg DO, Patient-derived induced pluripotent stem cells for modelling genetic retinal dystrophies Progress in retinal and eye research143:108542 2018
PubMed ID: 30217765
 
Michaud J, Thompson GN, Brody LC, Steel G, Obie C, Fontaine G, Schappert K, Keith CG, Valle D, Mitchell GA, Pyridoxine-responsive gyrate atrophy of the choroid and retina: clinical and biochemical correlates of the mutation A226V. Am J Hum Genet56:616-22 1995
PubMed ID: 7887415

External Links

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dbSNP dbSNP ID: 10865
Gene Cards OAT
Gene Ontology GO:0004587 ornithine-oxo-acid transaminase activity
GO:0005759 mitochondrial matrix
GO:0006520 amino acid metabolism
GO:0006591 ornithine metabolism
GO:0007601 visual perception
GO:0016740 transferase activity
GO:0030170 pyridoxal phosphate binding
NCBI Gene Gene ID:4942
NCBI GTR 258870 GYRATE ATROPHY OF CHOROID AND RETINA; GACR
613349 ORNITHINE AMINOTRANSFERASE; OAT
OMIM 258870 GYRATE ATROPHY OF CHOROID AND RETINA; GACR
613349 ORNITHINE AMINOTRANSFERASE; OAT
Omim Description HYPERORNITHINEMIA WITH GYRATE ATROPHY OF CHOROID AND RETINA; HOGA
  OAT DEFICIENCY
  ORNITHINE AMINOTRANSFERASE DEFICIENCY
  ORNITHINE AMINOTRANSFERASE-LIKE 3; OATL3, INCLUDED
  ORNITHINE KETOACID AMINOTRANSFERASE DEFICIENCY; OKT DEFICIENCY
  ORNITHINE-DELTA-AMINOTRANSFERASE DEFICIENCYORNITHINE AMINOTRANSFERASE; OAT, INCLUDED
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$281.00USD
U.S. Academic/Non-profit/Government:
$139.00USD
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