Cited by 30Metabolism and Genetic DisordersLysosomal Storage Disorders ResearchVirus-based gene therapy research

Co-expression of mutated and normal adrenoleukodystrophy protein reduces protein function: implications for gene therapy of X-linked adrenoleukodystrophy

Unterrainer, G.·2000·Human Molecular Genetics

Abstract

Inherited defects in the X-chromosomal adrenoleukodystrophy (ALD; ABCD1) gene are the genetic cause of the severe neurodegenerative disorder X-linked adrenoleukodystrophy (X-ALD). Biochemically the accumulation of very long-chain fatty acids, caused by impaired peroxisomal beta-oxidation, is the pathognomonic characteristic of the disease. Due to the X-chromosomal inheritance of X-ALD no data are available to clarify the question whether mutated adrenoleukodystrophy proteins (ALDPs) can negatively influence normal ALDP function. Here we show that restoration of beta-oxidation in X-ALD fibroblasts following transient transfection with normal ALD cDNA is more effective in ALDP-deficient fibroblasts compared with fibroblasts expressing normal amounts of mutated ALDP. Furthermore, we utilized the HeLa Tet-on system to construct a stable HeLa cell line expressing a constant level of endogenous ALDP and doxycycline-inducible levels of mutated ALDP. The induction was doxycycline dosage-dependent and the ALDP correctly localized. Interestingly, although mutated ALDP increased >6-fold in a dosage-dependent manner the total amount of ALDP (mutated and normal) remained approximately even as demonstrated by western blot and flow cytometric analyses. Thus, apparently mutated and normal ALDP compete for integration into a limited number of sites in the peroxisomal membrane. Consequently, increased amounts of mutated ALDP resulted in decreased peroxisomal beta-oxidation and accumulation of very long-chain fatty acids. These findings have direct implications on future gene therapy approaches for treatment of X-ALD, since in some patients a non-functional endogenous protein could act in a dominant negative way or displace the introduced, normal protein.

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Authors
Unterrainer, G.
Affiliations
University of Vienna (AT)
Corresponding author
Unterrainer, G.
Venue
Human Molecular Genetics
Published
2000-11-01
Volume
9
Issue
18
Pages
2609-2616
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2120211298
Cited by
30
References
41
Citations by year
2025: 1 · 2024: 2 · 2022: 2 · 2020: 1 · 2017: 1 · 2015: 1 · 2014: 1
FWCI
1.64
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Health Sciences › Medicine › Physiology › Lysosomal Storage Disorders Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
Keywords
X-linked adrenoleukodystrophy, ABCD1, dominant negative effect, protein co-expression, peroxisomal beta-oxidation, very long chain fatty acids, gene therapy, doxycycline-inducible expression, fibroblasts
MeSH terms
ATP Binding Cassette Transporter, Subfamily D, Member 1, Adrenoleukodystrophy, Doxycycline, Fatty Acids, Female, Fibroblasts, Flow Cytometry, HeLa Cells, Humans, Genetic Linkage, Male, Membrane Proteins, Molecular Sequence Data, Oxidation-Reduction, Protein Conformation, RNA, Messenger, Transfection, X Chromosome, Blotting, Western, Genetic Therapy, Gene Expression, Point Mutation, ATP-Binding Cassette Transporters, Fluorescent Antibody Technique, Indirect, Peroxisomes

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