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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Nutritional therapy improves growth and protein status of children with a urea cycle enzyme defect.

BACKGROUND: Poor growth has been described in patients with urea cycle enzyme defects treated with protein-restricted diets, while protein status is seldom reported. OBJECTIVE: To assess the effects of nutritional therapy with a medical food on growth and protein status of patients with a urea cycle enzyme defect. METHODS: A 6-mo multicenter outpatient study was conducted with infants and toddlers managed by nutrition therapy with Cyclinex-1 Amino Acid-Modified Medical Food with Iron (Ross Products Division, Abbott Laboratories, Columbus, OH). Main outcome variables were anthropometrics and plasma amino acids (selected), albumin, and transthyretin concentrations. RESULTS: Seventeen patients completed the study. Mean (+/-SE) baseline age was 11.30+/-3.20 months (median 4.40 months; range 0.22-38.84 months). Length and weight z-scores increased significantly during the 6-month study. Head circumference increased, but not significantly. Three patients were stunted and two were wasted (-2.0 z-score) at baseline while at study end, only one patient was both stunted and wasted. The majority of patients increased in length, head circumference, and weight z-scores during study. Mean (+/-SE) plasma albumin concentration increased from 34+/-2g/L at baseline to 38+/-1g/L at study end. Plasma transthyretin increased from a mean (+/-SE) of 177+/-13 mg/L at baseline to 231+/-15 mg/L at study end. No correlation was found between plasma NH(3) concentrations and medical food intake. Plasma NH(3) concentration was positively correlated with the percentage of Food and Agriculture Organization/World Health Organization/United Nations recommended protein ingested. CONCLUSIONS: Intakes of adequate protein and energy for age result in anabolism and linear growth without increasing plasma NH(3) concentrations. Medical food intakes did not correlate with plasma NH(3) concentrations.[1]


  1. Nutritional therapy improves growth and protein status of children with a urea cycle enzyme defect. Acosta, P.B., Yannicelli, S., Ryan, A.S., Arnold, G., Marriage, B.J., Plewinska, M., Bernstein, L., Fox, J., Lewis, V., Miller, M., Velazquez, A. Mol. Genet. Metab. (2005) [Pubmed]
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