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Sequence variations in the NDUFA1 gene encoding a subunit of complex I of the respiratory chain

  • Published:
Journal of Inherited Metabolic Disease

Abstract

NDUFA1 is one of the 36 nuclear genes encoding subunits of the mitochondrial complex I involved in the respiratory chain. The human NDUFA1 has been cloned, completely sequenced and mapped to Xq24. In the present study, we searched for sequence variations in NDUFA1 as causative defects in complex I deficiency using genomic DNA of 152 patients with various clinical phenotypes. The patient sample consisted of 54 patients (46 male and 8 female) with Leber heriditary optic neuropathy (LHON) from 48 unrelated families from Germany and 98 patients (72 male and 26 female) with biochemically proven complex I deficiency including Leigh syndrome. Patient DNA was used to amplify all three exons, including the exon/intron boundaries and the promoter region of NDUFA1 for heteroduplex analysis and direct sequencing. In the 152 patients tested, no mutation was found that could be related to any of the disease phenotypes included. However, three single-nucleotide polymorphisms (SNPs) located in the promoter region (SNP G/C at nt −71 and SNP T/C at nt −189) and in intron 1 (SNP T/G nt 1454) were discovered. Allele frequencies of the SNPs were estimated in a German and Estonian control population and compared to complex I-deficient patients. There was no significant difference between the control population, the LHON patients, or the severely affected patients with complex I deficiency, excluding an association of the polymorphisms with the diseases. Our results suggest that mutations in NDUFA1 do not cause the gender difference observed in clinically severe and complex phenotypes with complex I deficiency.

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Authors and Affiliations

  1. Institute of Human Genetics, Greifswald

    I. Wittig & M. S. Wehnert

  2. Institute of Diabetes 'Gerhardt Katsch Karlsburg e.V.', Karlsburg, Germany

    P. Augstein

  3. Genetics Laboratory, Department of Biochemistry, Oxford, UK

    G. K. Brown

  4. Department of Pediatrics, Shiga Medical Centre for Children, Shiga, Japan

    T. Fujii

  5. Hospital des Enfants-Malades, Paris, France

    A. Rötig, P. Rustin & A. Munnich

  6. Research Group for Neurobiology and Cell Biology, Dresden, Germany

    P. Seibel

  7. The Murdoch Institute, Melbourne, Australia

    D. Thorburn

  8. Molecular Genetics Laboratory, University Eye Hospital, Tübingen, Germany

    B. Wissinger

  9. Institute of Molecular and Cell Biology, University of Tartu, Estonian Biocentre, Tartu, Estonia

    K. Tamboom & A. Metspalu

  10. Institute of Neurology, Milan, Italy

    E. Lamantea & M. Zeviani

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  1. I. Wittig
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  2. P. Augstein
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  3. G. K. Brown
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  4. T. Fujii
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  5. A. Rötig
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  7. A. Munnich
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  8. P. Seibel
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  9. D. Thorburn
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  10. B. Wissinger
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  11. K. Tamboom
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  12. A. Metspalu
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  13. E. Lamantea
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  15. M. S. Wehnert
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Wittig, I., Augstein, P., Brown, G.K. et al. Sequence variations in the NDUFA1 gene encoding a subunit of complex I of the respiratory chain. J Inherit Metab Dis 24, 15–27 (2001). https://doi.org/10.1023/A:1005638218246

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  • DOI: https://doi.org/10.1023/A:1005638218246

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