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Childhood form of adrenoleukodystrophy in the sucking infant
Insights
Early detection of childhood adrenoleukodystrophy (ALD) in an infant using plasma ratios allowed for early intervention with a specialized diet. Ultrastructural analysis revealed key cellular changes before clinical symptoms manifested.
Area of Science:
- Biochemistry
- Pediatrics
- Genetics
Background:
- Childhood adrenoleukodystrophy (ALD) is a rare genetic disorder affecting the adrenal glands and white matter of the brain.
- Early detection and intervention are crucial for managing ALD and potentially slowing disease progression.
Observation:
- A sucking infant was diagnosed with childhood ALD before symptom onset through elevated very long-chain fatty acid (VLCFA) ratios in umbilical cord plasma.
- Dietary intervention with very long-chain saturated fatty acid-restricted milk was initiated immediately.
- Ultrastructural examination of rectal mucosa at 3 months revealed characteristic electron-lucent clefts in histiocytes, consistent with ALD.
Findings:
- Elevated C24:0/C22:0 and C26:0/C22:0 ratios in umbilical cord plasma are significant indicators for early ALD diagnosis.
- The presence of rectilinear and/or curved electron-lucent clefts in histiocytes is a reliable ultrastructural marker for ALD.
- Cerebral magnetic resonance imaging (MRI) and T1/T2 values showed normal ranges in various brain regions at this early stage.
Implications:
- This case highlights the efficacy of newborn screening using plasma VLCFA ratios for identifying ALD before clinical manifestation.
- Early dietary management can be implemented, potentially altering the disease course.
- Ultrastructural findings provide valuable diagnostic confirmation in infants suspected of ALD, even with normal neuroimaging.
Abstract:
The childhood form of adrenoleukodystrophy (ALD) in a sucking infant was discovered before the appearance of clinical symptoms. C24:0/C22:0 and C26:0/C22:0 ratios in umbilical cord plasma were significantly higher so that very long-chain saturated fatty acid-restricted milk was given. Ultrastructural study on biopsied rectal mucosa revealed rectilinear and/or curved electron-lucent clefts in the histiocytes at 3 months of age, which were also recognized in the elder brother and another boy with symptoms of ALD. However, magnetic resonance imaging and T1 and T2 values were within the normal range in cerebral gray matter, cerebral white matter, caudate nucleus, internal capsule, and thalamus.