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Lam, C.W. et al.

Novel mutation in the GRHPR gene in a Chinese patient with primary hyperoxaluria type 2 requiring renal transplantation from a living related donor.

We identified a patient with primary hyperoxaluria type 2 (PH2) showing recurrent stone formation, nephrocalcinosis, end-stage renal failure, and rapid oxalate deposition after renal transplantation from a living related donor. Urinary organic acid analysis performed after renal transplantation confirmed the diagnosis of PH2. We analyzed the glyoxylate reductase/hydroxypyruvate reductase (GRHPR) gene of the patient. DNA sequencing of all nine exons and exon-intron boundaries showed a novel homozygous mutation deleting the last two nucleotides of exon 8, ie, 862delTG. This deletion results in a frameshift and introduction of a premature stop codon at codon 310, ie, Ala310Stop. One of the patient's sisters is heterozygous for this mutation, and the other sister, who is the donor, does not have this mutation. The rapid deposition of oxalate in the transplanted kidney indicates that the kidney is not a major site of oxalate production. The more favorable long-term prognosis of PH2 needs to be reevaluated now that the molecular basis of PH2 has been established. DNA-based diagnosis will facilitate carrier detection, prenatal diagnosis, genetic counseling, and selection of living related donors.[1]

References

Novel mutation in the GRHPR gene in a Chinese patient with primary hyperoxaluria type 2 requiring renal transplantation from a living related donor. Lam, C.W., Yuen, Y.P., Lai, C.K., Tong, S.F., Lau, L.K., Tong, K.L., Chan, Y.W. Am. J. Kidney Dis. (2001) [Pubmed]

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