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Human Genetics

, Volume 123, Issue 4, pp 321–332 | Cite as

The human gamma-glutamyltransferase gene family

  • Nora Heisterkamp
  • John Groffen
  • David Warburton
  • Tam P. Sneddon
Review

Abstract

Assays for gamma-glutamyl transferase (GGT1, EC 2.3.2.2) activity in blood are widely used in a clinical setting to measure tissue damage. The well-characterized GGT1 is an extracellular enzyme that is anchored to the plasma membrane of cells. There, it hydrolyzes and transfers γ-glutamyl moieties from glutathione and other γ-glutamyl compounds to acceptors. As such, it has a critical function in the metabolism of glutathione and in the conversion of the leukotriene LTC4 to LTD4. GGT deficiency in man is rare and for the few patients reported to date, mutations in GGT1 have not been described. These patients do secrete glutathione in urine and fail to metabolize LTC4. Earlier pre-genome investigations had indicated that besides GGT1, the human genome contains additional related genes or sequences. These sequences were given multiple different names, leading to inconsistencies and confusion. Here we systematically evaluated all human sequences related to GGT1 using genomic and cDNA database searches and identified thirteen genes belonging to the extended GGT family, of which at least six appear to be active. In collaboration with the HUGO Gene Nomenclature Committee (HGNC) we have designated possible active genes with nucleotide or amino acid sequence similarity to GGT1, as GGT5 (formerly GGL, GGTLA1/GGT-rel), GGT6 (formerly rat ggt6 homologue) and GGT7 (formerly GGTL3, GGT4). Two loci have the potential to encode only the light chain portion of GGT and have now been designated GGTLC1 (formerly GGTL6, GGTLA4) and GGTLC2. Of the five full-length genes, three lack of significant nucleotide sequence homology but have significant (GGT5, GGT7) or very limited (GGT6) amino acid similarity to GGT1 and belong to separate families. GGT6 and GGT7 have not yet been described, raising the possibility that leukotriene synthesis, glutathione metabolism or γ-glutamyl transfer is regulated by their, as of yet uncharacterized, enzymatic activities. In view of the widespread clinical use of assays that measure γ-glutamyl transfer activity, this would appear to be of significant interest.

Keywords

Light Chain Glutathione Metabolism Uncharacterized Gene Null Mutant Mouse HUGO Gene Nomenclature Committee 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The literature on GGT in human and other species is very extensive and we apologize to those authors of whom the work could not be cited. This work was supported by PHS grants HL071945 and HL060231, NHGRI grant P41 HG 003345, the UK Medical Research Council and the Wellcome Trust.

Supplementary material

439_2008_487_MOESM1_ESM.doc (46 kb)
Supplementary data (DOC 46 kb)

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Nora Heisterkamp
    • 1
    • 2
  • John Groffen
    • 1
    • 2
  • David Warburton
    • 3
  • Tam P. Sneddon
    • 4
  1. 1.Division of Hematology/OncologyThe Saban Research Institute of Childrens HospitalLos AngelesUSA
  2. 2.Department of Pathology, Keck School of MedicineUniversity of Southern CaliforniaLos AngelesUSA
  3. 3.Developmental Biology Program and Department of SurgeryThe Saban Research Institute of Childrens HospitalLos AngelesUSA
  4. 4.HUGO Gene Nomenclature Committee (HGNC), Department of BiologyUniversity College LondonLondonUK

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