title: A case of carbamoyl phosphate synthetase 1 deficiency presenting symptoms at one month of age.
abstract: Carbamoyl phosphate synthetase 1 deficiency (CPS1D) is an autosomal recessive disorder of the urea cycle which causes hyperammonemia. Two forms of CPS1D are recognized: a lethal neonatal type and a less severe, delayed onset type. Neonatal CPS1D cases often present their symptoms within the first days of life. Delayed onset type were adolescents or adults, and infantile cases were rare. We report a case of CPS1D in a boy who developed symptoms at one month of age. He showed excellent response to treatments including continuous hemodialysis, drugs and a low-protein diet. His development and weight gain were good at the last follow-up at 1 year and three months of age. Molecular assay of the CPS1 gene demonstrated that the patient was heterozygous for c.2407C>G (R803G: maternal) in exon 20 and c.3784C>T (R1262X: paternal) in exon 32. Our clinical experience suggests that CPS1D could be one of the causes of hyperammonemia in early infantile cases.
authors.affiliation: Department of Pediatrics, Hiroshima Prefectural Hospital, 1-5-54 Ujina Kanda, Minami-ku, Hiroshima 734-0844, Japan. h-ono@hph.pref.hiroshima.jp
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ono
authors.forename: Tetsushi
authors.initials: T
authors.lastname: Suto
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Kinoshita
authors.forename: Takashi
authors.initials: T
authors.lastname: Sakano
authors.forename: Takeki
authors.initials: T
authors.lastname: Furue
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Ohta
mesh_terms: D020165:Carbamoyl-Phosphate Synthase I Deficiency Disease / Q000175:diagnosis* / Q000178:diet therapy / Q000188:drug therapy / Q000235:genetics; D004252:DNA Mutational Analysis; D005808:Genes, Recessive; D006801:Humans; D007223:Infant; D008297:Male; D009154:Mutation