From OMIMDent disease-2 (DENT2) is an X-linked disorder of renal tubular epithelial function in which all of the clinical findings may be traced to impaired reabsorption of filtered solutes. Characteristic abnormalities include low molecular weight proteinuria and other features of Fanconi syndrome (see 134600), such as glycosuria, aminoaciduria, and phosphaturia, but typically do not include proximal renal tubular acidosis. Progressive renal failure is common, as are nephrocalcinosis and kidney stones (summary by Hoopes et al., 2005).
For a discussion of genetic heterogeneity of Dent disease, see 300009.
http://www.omim.org/entry/300555 From MedlinePlus GeneticsDent disease is a chronic kidney disorder that occurs almost exclusively in males. In affected individuals, kidney problems result from damage to structures called proximal tubules. Signs and symptoms of this condition appear in early childhood and worsen over time.
The most frequent sign of Dent disease is the presence of an abnormally large amount of proteins in the urine (tubular proteinuria). Other common signs of the disorder include excess calcium in the urine (hypercalciuria), calcium deposits in the kidneys (nephrocalcinosis), and kidney stones (nephrolithiasis). Kidney stones can cause abdominal pain and blood in the urine (hematuria). In most affected males, progressive kidney problems lead to end-stage renal disease (ESRD) in early to mid-adulthood. ESRD is a life-threatening failure of kidney function that occurs when the kidneys are no longer able to filter fluids and waste products from the body effectively.
Some people with Dent disease develop rickets, a bone disorder that results when the levels of vitamin D and certain minerals (including calcium) in the blood become too low. Rickets can be associated with weakening and softening of the bones, bone pain, bowed legs, and difficulty walking.
Researchers have described two forms of Dent disease, which are distinguished by their genetic cause and pattern of signs and symptoms. Both forms of Dent disease (type 1 and type 2) are characterized by the features described above, but Dent disease 2 can also be associated with abnormalities unrelated to kidney function. These additional signs and symptoms include mild intellectual disability, weak muscle tone (hypotonia), and clouding of the lens of the eyes (cataract) that is described as subclinical because it does not impair vision. Some researchers consider Dent disease 2 to be a mild variant of a similar disorder called Lowe syndrome.
https://medlineplus.gov/genetics/condition/dent-disease