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Related Experiment Videos

ABCD1 translation-initiator mutation demonstrates genotype-phenotype correlation for AMN.

G N O'Neill1, M Aoki, R H Brown

  • 1Cecil B. Day Laboratory for Neuromuscular Research, Massachusetts General Hospital, Boston, MA, USA.

Neurology
|December 12, 2001
PubMed
Summary

A novel ABCD1 gene mutation causes a truncated adrenoleukodystrophy protein (ALDP), leading to reduced very long chain fatty acid (VLCFA) beta-oxidation. This mutation uniformly results in the adrenomyeloneuropathy (AMN) phenotype in all female carriers.

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Area of Science:

  • Genetics and Molecular Biology
  • Biochemistry
  • Neurology

Background:

  • X-linked adrenoleukodystrophy (X-ALD) results from ABCD1 gene mutations, causing cerebral ALD and adrenomyeloneuropathy (AMN).
  • Biochemical hallmark is reduced very long chain fatty acid (VLCFA) beta-oxidation and VLCFA ester accumulation in neural white matter.
  • Genotype-phenotype correlations in X-ALD are not well-established, with both disorders appearing in families and twin pairs.

Purpose of the Study:

  • Investigate a kindred with a consistent AMN phenotype and X-linked dominant hereditary spastic paraparesis resemblance.
  • Analyze the ABCD1 gene and its protein expression in affected individuals.
  • Determine the impact of identified mutations on VLCFA metabolism.

Main Methods:

  • Direct sequencing of the ABCD1 gene (genomic DNA and cDNA).

Related Experiment Videos

  • Reverse transcriptase PCR for mutant gene transcription analysis.
  • Western blotting and immunofluorescence for ALD protein (ALDP) expression.
  • In vitro assay for VLCFA beta-oxidation.

    • Main Results:

    • A novel deletion of the ABCD1 gene's translation initiation codon was identified.
    • An N-terminal truncated ALDP, lacking the first 65 amino acids, is produced via internal translation initiation.
    • This truncated ALDP is trafficked to peroxisomes, and VLCFA beta-oxidation is reduced to 20% of normal.
    • Complete disease penetrance was observed in all female carriers of this mutation.

    Conclusions:

    • Internal translation initiation generates a truncated ALDP, consistently causing an AMN phenotype in this family.
    • The study suggests a specific mechanism for AMN pathogenesis linked to this novel mutation.
    • Models for the truncated ALDP's function and full penetrance in heterozygotes are discussed.