Published online August 31, 2005
PEDIATRICS Vol. 116 No. 3 September 2005, pp. 757-766 (doi:10.1542/peds.2004-1897)
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EXPERIENCE AND REASON

Isolated Sulfite Oxidase Deficiency: A Case Report With a Novel Mutation and Review of the Literature

Wen-Hann Tan, MRCPCH*, Florian S. Eichler, MD{ddagger}, Sadaf Hoda, BS§, Melissa S. Lee, MD||, Hagit Baris, MD*, Catherine A. Hanley, MS, RD, P. Ellen Grant, MD#, Kalpathy S. Krishnamoorthy, MD{ddagger} and Vivian E. Shih, MD§

* Genetics Training Program
|| Harvard Combined Medicine/Pediatrics Program, Harvard Medical School, Boston, Massachusetts
{ddagger} Pediatric Neurology Unit
§ Amino Acid Disorders Laboratory, Department of Neurology
Nutrition Services
# Division of Neuroradiology, Massachusetts General Hospital, Boston, Massachusetts

Isolated sulfite oxidase deficiency is a rare but devastating neurologic disease that usually presents in early infancy with seizures and alterations in muscle tone. Only 21 cases have been reported in the literature. We report a case of a newborn infant boy with isolated sulfite oxidase deficiency who presented with generalized seizures on his fourth day of life. Plasma total homocysteine was not detectable. Urinary sulfite, thiosulfate, and S-sulfocysteine levels were elevated. The patient began a low-methionine and low-cysteine diet and was treated with thiamine and dextromethorphan. However, he became increasingly microcephalic and was severely developmentally delayed. Mutation analysis of the sulfite oxidase gene revealed that the patient was homozygous for a novel 4-base pair deletion, and both of his parents were found to be heterozygous carriers of the same deletion. We reviewed the clinical, biochemical, neuroradiologic, and neuropathologic features in all published cases of isolated sulfite oxidase deficiency. Seizures or abnormal movements were prominent features in all cases. Developmental delays were reported in 17 cases. Ectopia lentis was detected in 9 cases. Clinical improvement with dietary therapy was seen in only 2 patients, both of whom presented after the age of 6 months and had relatively mild developmental delays. Plasma or urinary S-sulfocysteine levels were elevated in all cases. Urinary sulfite was detected in all except 1 case. Cerebral atrophy and cystic encephalomalacia were observed with neuroradiologic imaging and were noted in all 3 postmortem reports of isolated sulfite oxidase deficiency. The main alternative in the differential diagnosis of isolated sulfite oxidase deficiency is molybdenum cofactor deficiency.

Key Words: sulfite • sulfite oxidase • SUOX gene • molybdenum cofactor • inborn error of metabolism

Abbreviations: CVS, chorionic villus sampling • EEG, electroencephalographic • MMP, matrix metalloproteinase • NMDA, N-methyl-D-aspartate • TIMP, tissue inhibitor of metalloproteinases

Accepted Dec 7, 2004.




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