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Liu, R. SUOX Gene. Encyclopedia. Available online: (accessed on 12 April 2024).
Liu R. SUOX Gene. Encyclopedia. Available at: Accessed April 12, 2024.
Liu, Rui. "SUOX Gene" Encyclopedia, (accessed April 12, 2024).
Liu, R. (2020, December 24). SUOX Gene. In Encyclopedia.
Liu, Rui. "SUOX Gene." Encyclopedia. Web. 24 December, 2020.

Sulfite oxidase: The SUOX gene provides instructions for making an enzyme called sulfite oxidase, which helps break down protein building blocks (amino acids) that contain sulfur when they are no longer needed.


1. Normal Function

The SUOX gene provides instructions for making an enzyme called sulfite oxidase, which helps break down protein building blocks (amino acids) that contain sulfur when they are no longer needed. Specifically, sulfite oxidase is involved in the final step of this process, in which sulfur-containing molecules called sulfites are converted to other molecules called sulfates by adding an oxygen atom (a process called oxidation).

2. Health Conditions Related to Genetic Changes

2.1. Isolated sulfite oxidase deficiency

At least 27 SUOX gene mutations have been identified in people with isolated sulfite oxidase deficiency (ISOD), a severe disorder that causes brain damage and is generally fatal in the first months or years of life. The SUOX gene mutations that cause ISOD impair the function of sulfite oxidase, preventing complete breakdown of sulfur-containing amino acids. As a result, sulfites and other compounds left over from the partial breakdown process abnormally accumulate in the body. Researchers suggest that the nervous system is especially sensitive to this abnormal accumulation, and excessive levels of sulfite compounds that are toxic to the brain are thought to result in the brain damage that occurs in ISOD.

2.2. Polycystic ovary syndrome

3. Other Names for This Gene

  • sulfite oxidase, mitochondrial


  1. Bindu PS, Nagappa M, Bharath RD, Taly AB. Isolated Sulfite Oxidase Deficiency.2017 Sep 21. In: Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LJH, StephensK, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University ofWashington, Seattle; 1993-2020. Available from
  2. Claerhout H, Witters P, Régal L, Jansen K, Van Hoestenberghe MR, Breckpot J,Vermeersch P. Isolated sulfite oxidase deficiency. J Inherit Metab Dis. 2018Jan;41(1):101-108. doi: 10.1007/s10545-017-0089-4.
  3. Karakas E, Kisker C. Structural analysis of missense mutations causingisolated sulfite oxidase deficiency. Dalton Trans. 2005 Nov 7;(21):3459-63.
  4. Karakas E, Wilson HL, Graf TN, Xiang S, Jaramillo-Busquets S, Rajagopalan KV, Kisker C. Structural insights into sulfite oxidase deficiency. J Biol Chem. 2005 Sep 30;280(39):33506-15.
  5. Tan WH, Eichler FS, Hoda S, Lee MS, Baris H, Hanley CA, Grant PE,Krishnamoorthy KS, Shih VE. Isolated sulfite oxidase deficiency: a case reportwith a novel mutation and review of the literature. Pediatrics. 2005Sep;116(3):757-66. Review. Erratum in: Pediatrics. 2005 Dec;116(6):1615.
  6. Zaki MS, Selim L, El-Bassyouni HT, Issa MY, Mahmoud I, Ismail S, Girgis M,Sadek AA, Gleeson JG, Abdel Hamid MS. Molybdenum cofactor and isolated sulphiteoxidase deficiencies: Clinical and molecular spectrum among Egyptian patients.Eur J Paediatr Neurol. 2016 Sep;20(5):714-22. doi: 10.1016/j.ejpn.2016.05.011.
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Update Date: 24 Dec 2020