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X-linked adrenoleukodystrophy: adult cerebral variant
D F Farrell1, S R Hamilton, T A Knauss
1Department of Medicine, University of Washington, Seattle 98195.
Neurology
|August 1, 1993
Summary
This study details a unique case of adult-onset adrenoleukodystrophy presenting with intellectual decline, which resolved spontaneously. Genetic analysis revealed a hybrid gene linked to color vision defects, suggesting its locus is further from the adrenoleukodystrophy gene than previously thought.
Area of Science:
- Neuroscience
- Genetics
- Endocrinology
Background:
- Adrenoleukodystrophy (ALD) is a rare genetic disorder affecting the nervous system and adrenal glands.
- Adult-onset ALD can present with diverse neurological symptoms, often without early signs of adrenal insufficiency.
- The genetic basis of ALD and its proximity to other X-linked genes are areas of ongoing research.
Observation:
- A 43-year-old architect presented with progressive intellectual decline, a primary symptom of adult-onset ALD.
- Serial MRI scans revealed evolving demyelination, initially in the frontal and later in the occipital white matter.
- Remarkably, both the patient's neurological symptoms and MRI-observed demyelination resolved spontaneously over time without intervention.
Findings:
- The patient and two male relatives (brother and nephew) exhibited a red/green color vision defect.
- Genetic analysis identified a 5' green-red 3' hybrid gene array in these individuals, associated with deutan color vision defects.
- This finding suggests that the adrenoleukodystrophy gene may be located further from the red/green color vision gene array on the X chromosome than previously established.
Implications:
- This case highlights the potential for spontaneous resolution in adult-onset adrenoleukodystrophy, challenging typical disease progression models.
- The genetic findings refine the understanding of gene mapping on the X chromosome, specifically concerning ALD and color vision genes.
- Further research is warranted to explore the mechanisms behind spontaneous demyelination resolution and the precise genetic linkage in ALD patients with color vision abnormalities.