In other species: dog , giant otter , domestic cat , taurine cattle

Categories: Renal / urinary system phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 278300 (trait) , 603592 (trait)

Mendelian trait/disorder: unknown

Disease-related: yes

Cross-species summary: Animals with hereditary xanthinuria (excretion of large amounts of xanthine in the urine) may be asymptomatic, may have subclinical uroliths (xanthine stones), or present with clinical signs of urolithiasis. Urolith formation can be influenced by other biologic and environmental factors such as sex, diet and urine properties. Xanthinuria, type I (OMIA:002445) is caused by variation in the XDH gene and xanthinuria, type II (OMIA:001819) is caused by variation in the MOCOS gene. Information relating to xanthinuria without identified causal variants is listed under xanthinuria, generic (OMIA:001283).

Species-specific description: Vail et al. (2019) provided "the first report describing the clinical presentation and pathology associated with xanthine urolithiasis in a goat. ... Exonic sequencing of xanthine dehydrogenase (XDH) and molybdenum cofactor sulfurase (MOCOS) identified 2 putative pathogenic variants: a heterozygous XDH p.Leu128Pro variant and a homozygous MOCOS p.Asp303Gly variant." The authors concluded that "The data support hereditary xanthinuria, but functional studies are needed to conclusively determine the causal variant(s)."

Clinical features: Vail et al. (2019): "A 2-year-old mixed breed goat was presented for a 1-day history of anorexia and 1 week of weight loss."

Pathology: Vail et al. (2019): "Serum biochemistry disclosed severe azotemia. Abdominal ultrasound examination showed decreased renal corticomedullary distinction, poor visualization of the renal pelves, and dilated ureters. On necropsy, the kidneys were small, the pelves were dilated, and the medulla was partially effaced by variably sized yellow nephroliths. Histologically, cortical and medullary tubules were distended by yellow-brown, multilayered crystals. Stone composition was 100% xanthine."