Synonyms
Galactosemia type II; Galk deficiency
Definition and Characteristics
Autosomal recessive inborn error in galactose metabolism leading to hypergalactosemia and cataract formation.
Genes
GALK1 coding for galactokinase, localized on chromosome 17q24 [4].
Molecular and Systemic Pathophysiology
Galactokinase functions in normal galactose metabolism by catalyzing the MgATP-dependent phosphorylation of the C-1 hydroxyl group of α-d-galactose. Approximately 25 mutations (including base substitutions, base deletions, and larger deletions) have been reported in human galactokinase, which give rise to Type II galactosemia (MIM#230200). The main clinical manifestation of galactokinase deficiency is...
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References
Okano Y et al. (2001) A genetic factor for age-related cataract: identification and characterization of a novel galactokinase variant, “Osaka,” in Asians. Am J Hum Genet 68:1036–1042
Reich S et al. (2002) An unexpectedly high frequency of hypergalactosemia in an immigrant Bosnian population revealed by newborn screening. Pediatr Res 51:598–601
Hunter M et al. (2002) The P28T mutation in the GALK1 gene accounts for galactokinase deficiency in Roma (Gypsy) patients across Europe. Pediatr Res 51:602–606
Stambolian D et al. (1995) Cloning of the galactokinase cDNA and identification of mutations in two families with cataracts. Nat Genet 10:307–312
Holden HM et al. (2004) Galactokinase: structure, mechanism and role in type II galactosemia. Cell Mol Life Sci 61:2471–2484
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Timson, D.J., Reece, R.J., Thoden, J.B., Holden, H.M. (2009). Galactokinase Deficiency. In: Lang, F. (eds) Encyclopedia of Molecular Mechanisms of Disease. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-29676-8_669
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DOI: https://doi.org/10.1007/978-3-540-29676-8_669
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-67136-7
Online ISBN: 978-3-540-29676-8
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