Maternal isodisomy of the telomeric end of chromosome 2 is responsible for a case of primary hyperoxaluria type 1
- 3 December 2004
- journal article
- case report
- Published by Wiley in American Journal of Medical Genetics Part A
- Vol. 132A (1), 80-83
- https://doi.org/10.1002/ajmg.a.30375
Abstract
Primary hyperoxaluria type 1 (PH1) is an autosomal recessive disorder of glyoxylate metabolism, in which excessive oxalates are formed by the liver and excreted by the kidneys, causing a wide spectrum of disease, ranging from renal failure in infancy to mere renal stones in late adulthood. This disease is caused by a deficiency of alanine:glyoxylate aminotransferase (AGT), which is encoded by a single copy gene, AGXT, located in 2q37.3. We identified an apparently homozygous, loss‐of‐function, mutation in a patient; the gene defect was present in the heterozygous mother but not in the patient's father. We performed a microsatellite repeat analysis using 13 specific chromosome 2 markers and non‐chromosome 2 minisatellites. Six specific chromosome 2 markers showed an apparently homozygous maternal inheritance while four showed a biparental transmission consistent with paternity (confirmed by minisatellite analysis). Quantitative PCR of AGXT exons 1 and 3 on the patient's and parents genomic DNA revealed the presence of two copies of the gene. This is the first case of PH1 caused by segmental maternal isodisomy of 2q37.3.Keywords
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