Primary hyperoxaluria, type I- MedGen UID:
- 75658
- •Concept ID:
- C0268164
- •
- Disease or Syndrome
Primary hyperoxaluria type 1 (PH1) is caused by a deficiency of the liver peroxisomal enzyme alanine:glyoxylate-aminotransferase (AGT), which catalyzes the conversion of glyoxylate to glycine. When AGT activity is absent, glyoxylate is converted to oxalate, which forms insoluble calcium oxalate crystals that accumulate in the kidney and other organs. Individuals with PH1 are at risk for recurrent nephrolithiasis (deposition of calcium oxalate in the renal pelvis / urinary tract), nephrocalcinosis (deposition of calcium oxalate in the renal parenchyma), or end-stage renal disease (ESRD). Age at onset of symptoms ranges from infancy to the sixth decade. Approximately 10% of affected individuals present in infancy or early childhood with nephrocalcinosis, with or without nephrolithiasis, and failure to thrive related to renal failure. The majority of individuals with PH1 present in childhood or early adolescence, usually with symptomatic nephrolithiasis and normal or reduced kidney function. The remainder of affected individuals present in adulthood with recurrent renal stones and a mild-to-moderate reduction in kidney function. The natural history of untreated PH1 is one of progressive decline in renal function as a result of calcium oxalate deposits in kidney tissue and complications of nephrolithiasis (e.g., obstruction and infection) with eventual progression to oxalosis (widespread tissue deposition of calcium oxalate) and death from ESRD and/or complications of oxalosis.
Primary hyperoxaluria, type II- MedGen UID:
- 120616
- •Concept ID:
- C0268165
- •
- Disease or Syndrome
Primary hyperoxaluria type 2 (PH2), caused by deficiency of the enzyme glyoxylate reductase/hydroxypyruvate reductase (GR/HPR), is characterized by recurrent nephrolithiasis (deposition of calcium oxalate in the renal pelvis/urinary tract), nephrocalcinosis (deposition of calcium oxalate in the renal parenchyma), and end-stage renal disease (ESRD). After ESRD, oxalosis (widespread tissue deposition of calcium oxalate) usually develops. Symptom onset is typically in childhood.
Peroxisome biogenesis disorder 1B- MedGen UID:
- 79470
- •Concept ID:
- C0282527
- •
- Disease or Syndrome
Zellweger spectrum disorder (ZSD) is a phenotypic continuum ranging from severe to mild. While individual phenotypes (e.g., Zellweger syndrome [ZS], neonatal adrenoleukodystrophy [NALD], and infantile Refsum disease [IRD]) were described in the past before the biochemical and molecular bases of this spectrum were fully determined, the term "ZSD" is now used to refer to all individuals with a defect in one of the ZSD-PEX genes regardless of phenotype. Individuals with ZSD usually come to clinical attention in the newborn period or later in childhood. Affected newborns are hypotonic and feed poorly. They have distinctive facies, congenital malformations (neuronal migration defects associated with neonatal-onset seizures, renal cysts, and bony stippling [chondrodysplasia punctata] of the patella[e] and the long bones), and liver disease that can be severe. Infants with severe ZSD are significantly impaired and typically die during the first year of life, usually having made no developmental progress. Individuals with intermediate/milder ZSD do not have congenital malformations, but rather progressive peroxisome dysfunction variably manifest as sensory loss (secondary to retinal dystrophy and sensorineural hearing loss), neurologic involvement (ataxia, polyneuropathy, and leukodystrophy), liver dysfunction, adrenal insufficiency, and renal oxalate stones. While hypotonia and developmental delays are typical, intellect can be normal. Some have osteopenia; almost all have ameleogenesis imperfecta in the secondary teeth.
Calcium oxalate nephrolithiasis- MedGen UID:
- 318935
- •Concept ID:
- C1833683
- •
- Disease or Syndrome
Kleta (2006) reviewed aspects of renal stone disease. Nephrolithiasis and urolithiasis remain major public health problems of largely unknown cause. While disorders such as cystinuria (220100) and primary hyperoxaluria (see 259900) that have nephrolithiasis as a major feature have advanced understanding of the metabolic and physiologic processes of stone formation in general, they have not addressed the etiology of calcium oxalate stone formation, responsible for approximately 75% of urolithiasis cases in humans. Men are affected twice as often as women, but children show no such gender bias. The recurrence rate is also high. In populations of European ancestry, 5 to 10% of adults experience the painful precipitation of calcium oxalate in their urinary tracts.
Thorleifsson et al. (2009) noted that between 35 and 65% of hypercalciuric stone formers and up to 70% of subjects with hypercalciuria have relatives with nephrolithiasis, and twin studies have estimated the heritability of kidney stones to be 56%.
Genetic Heterogeneity of Calcium Oxalate Nephrolithiasis
See also CAON2 (620374), caused by mutation in the OXGR1 gene (606922) on chromosome 13q32.
Primary hyperoxaluria type 3- MedGen UID:
- 462228
- •Concept ID:
- C3150878
- •
- Disease or Syndrome
Primary hyperoxaluria is an autosomal recessive disorder of glyoxylate metabolism that results in excessive endogenous oxalate synthesis and the formation of calcium oxalate kidney stones. Progressive renal inflammation and interstitial fibrosis from advanced nephrocalcinosis, recurrent urolithiasis, and urinary tract infections can cause reduced renal function, systemic oxalate deposition, and end-stage renal failure. Compared to hyperoxaluria type I (HP1; 259900) and type II (HP2; 260000), HP3 appears to be the least severe, with good preservation of kidney function in most patients. The typical clinical characteristic is early onset of recurrent urolithiasis, but less active stone formation later (summary by Wang et al., 2015).
For a discussion of genetic heterogeneity of primary hyperoxaluria, see 259900.
Nephrolithiasis, calcium oxalate, 2, with or without nephrocalcinosis- MedGen UID:
- 1841152
- •Concept ID:
- C5830516
- •
- Disease or Syndrome
Calcium oxalate nephrolithiasis-2 with or without nephrocalcinosis (CAON2) is an autosomal dominant disorder of renal function characterized by the recurrent formation of CaOx kidney stones. The age at onset is highly variable, ranging from childhood to adult. Most affected individuals have concurrent nephrocalcinosis. Renal function is generally preserved (Majmundar et al., 2023).
See also CAON1 (167030).