IMR Press / FBL / Volume 17 / Issue 2 / DOI: 10.2741/3948

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with Frontiers in Bioscience.


Molecular insights into primary hyperoxaluria type i pathogenesis

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1 Department of Life Sciences and Reproduction, Section of Biological Chemistry, University of Verona, Strada Le Grazie 837134 Verona, Italy
2 Department of Biochemical Sciences, A. Rossi Fanelli, University, La Sapienza, 00185 Roma, Italy
Academic Editor:Carla Borri Voltattorni
Front. Biosci. (Landmark Ed) 2012, 17(2), 621–634;
Published: 1 January 2012
(This article belongs to the Special Issue Biomedical aspects of pyridoxal phosphate dependent enzymes)

Primary hyperoxaluria type 1 (PH1) is a rare autosomal recessive disorder of glyoxylate metabolism caused by the deficiency of liver peroxisomal alanine:glyoxylate aminotransferase (AGT), a pyridoxal 5'-phosphate (PLP)-dependent enzyme. The PH1 pathogenesis is mostly due to single point mutations (more than 150 so far identified) on the AGXT gene, and is characterized by a marked heterogeneity in terms of genotype, enzymatic and clinical phenotypes. This article presents an up to date review of selected aspects of the biochemical properties of the two allelic forms of AGT and of some PH1-causing variants. These recent discoveries highlight the effects at the protein level of the pathogenic mutations, and, together with previous cell biology and clinical data, (i) improve the understanding of the molecular basis of PH1 pathogenesis, and (ii) help to delineate perspectives for predicting the response to pyridoxine treatment or for suggesting new strategies for PH1 patients bearing the analyzed mutations.

Glyoxylate Aminotransferase
Pyridoxal 5’-Phosphate
Pathogenic Variant
Molecular Defect
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