Journal of Inherited Metabolic Disease

, Volume 33, Supplement 3, pp 307–313

A neonatal-onset succinyl-CoA:3-ketoacid CoA transferase (SCOT)-deficient patient with T435N and c.658-666dupAACGTGATT p.N220_I222dup mutations in the OXCT1 gene

  • Toshiyuki Fukao
  • Tomohiro Ishii
  • Naoko Amano
  • Petri Kursula
  • Masaki Takayanagi
  • Keiko Murase
  • Naomi Sakaguchi
  • Naomi Kondo
  • Tomonobu Hasegawa
Research Report

DOI: 10.1007/s10545-010-9168-5

Cite this article as:
Fukao, T., Ishii, T., Amano, N. et al. J Inherit Metab Dis (2010) 33(Suppl 3): 307. doi:10.1007/s10545-010-9168-5

Abstract

Succinyl-CoA:3-ketoacid CoA transferase (SCOT) deficiency causes episodic ketoacidotic crises and no apparent symptoms between them. Here, we report a Japanese case of neonatal-onset SCOT deficiency. The male patient presented a severe ketoacidotic crisis, with blood pH of 7.072 and bicarbonate of 5.8 mmol/L at the age of 2 days and was successfully treated with intravenous infusion of glucose and sodium bicarbonate. He was diagnosed as SCOT deficient by enzymatic assay and mutation analysis. At the age of 7 months, he developed a second ketoacidotic crisis, with blood pH of 7.059, bicarbonate of 5.4 mmol/L, and total ketone bodies of 29.1 mmol/L. He experienced two milder ketoacidotic crises at the ages of 1 year and 7 months and 3 years and 7 months. His urinary ketone bodies usually range from negative to 1+ but sometimes show 3+ (ketostix) without any symptoms. Hence, this patient does not show permanent ketonuria, which is characteristic of typical SCOT-deficient patients. He is a compound heterozygote of c.1304C > A (T435N) and c.658-666dupAACGTGATT p.N220_I222dup. mutations in the OXCT1 gene. The T435N mutation was previously reported as one which retained significant residual activity. The latter novel mutation was revealed to retain no residual activity by transient expression analysis. Both T435N and N220_I222 lie close to the SCOT dimerization interface and are not directly connected to the active site in the tertiary structure of a human SCOT dimer. In transient expression analysis, no apparent interallelic complementation or dominant negative effects were observed. Significant residual activity from the T435N mutant allele may prevent the patient from developing permanent ketonuria.

Abbreviations

SCOT

succinyl-CoA:3-ketoacid CoA transferase

TKB

total ketone bodies

FFA

free fatty acids

Copyright information

© SSIEM and Springer 2010

Authors and Affiliations

  • Toshiyuki Fukao
    • 1
    • 2
    • 3
  • Tomohiro Ishii
    • 4
  • Naoko Amano
    • 4
  • Petri Kursula
    • 5
  • Masaki Takayanagi
    • 6
  • Keiko Murase
    • 1
  • Naomi Sakaguchi
    • 1
  • Naomi Kondo
    • 1
  • Tomonobu Hasegawa
    • 4
  1. 1.Department of Pediatrics, Graduate School of MedicineGifu UniversityGifuJapan
  2. 2.Medical Information Sciences Division, United Graduate School of Drug Discovery and Medical Information SciencesGifu UniversityGifuJapan
  3. 3.Clinical Research DivisionNagara Medical CenterGifuJapan
  4. 4.Department of PediatricsKeio University School of MedicineShinjukuJapan
  5. 5.Department of BiochemistryUniversity of OuluOuluFinland
  6. 6.Chiba Children’s HospitalChibaJapan

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