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J Child Neurol. 2009 Dec;24(12):1513-9. doi: 10.1177/0883073809341269.

Sphingolipid activator protein B deficiency: report of 9 Saudi patients and review of the literature.

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Department of Medical Genetics, King Faisal Specialist Hospital and Research Centre (KFSH&RC), Riyadh, Saudi Arabia.


Mutated PSAP gene resulting in sphingolipid activator protein B deficiency is known to cause metachromatic leukodystrophy variant in which arylsulfatase A is normal. Of 16 patients with metachromatic leukodystrophy that were evaluated in our center, 7 patients were diagnosed with arylsulfatase A-deficient metachromatic leukodystrophy, whereas 9 children from 4 unrelated Saudi families were found to have sphingolipid activator protein B deficiency. PSAP analysis found that the 4 families segregate the same homozygous mutation that was a g.722G>C transversion resulting in C241S change, which was previously reported in an Arab patient. Our work, which reports the largest series of patients with sphingolipid activator protein B deficiency, suggests that this variant is likely to be more common than arylsulfatase A-deficient metachromatic leukodystrophy in Arabs, a notion that has potential diagnostic and preventive implications.

[Indexed for MEDLINE]

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