Sulfite oxidase activity deficiency caused by cofactor molybdenum deficiency: A case of early severe encephalopathy

Archives de pédiatrie : organe officiel de la Sociéte française de pédiatrie
C DuroussetH Patural

Abstract

Neonatal seizure incidence is approximately 3.5/1000 live births. Inborn metabolic diseases account for approximately 1-4% of neonatal seizure cases. Among them, the catabolism anomaly of sulfite to sulfate caused by sulfite oxidase or cofactor molybdenum deficiency (MoCD) is a rare metabolic disorder in which neurological damage is similar to that found in neonatal asphyxia. We report the case of a newborn child with a MoCD. Born of related parents, this child had intrauterine growth retardation predominating on size diagnosed in the third trimester of pregnancy. After an uneventful birth, he presented convulsions at the 12th hour of life, confirmed by an electroencephalogram. Anticonvulsants and adjuvant treatments were ineffective; the child then required intubation at day 5 of life. The initial biological assessment found an elevated blood lactate level and the chromatography of amino acids showed a significant decrease of cystine and the abnormal presence of sulfocysteine, suggestive of a lack of sulfite oxidase activity. The uric acid level measured secondarily was low, suggesting a MoCD. Brain MRI was performed at day 5 for diffuse ischemic injury of different ages. After limiting acute care, the child died at day 14 of ...Continue Reading

References

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