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A very rare genetic disorder of water balance, closely resembling the far more frequent syndrome of inappropriate antidiuretic secretion (SIAD) characterised by hypotonic hyponatraemia due to impaired free water excretion and undetectable or low plasma arginine vasopressin (AVP) levels. Symptoms are the classical symptoms of hyponatraemic encephalopathy such as nausea, vomiting, dizziness and gait disturbances. Caused by a gain of function mutation in the type 2 AVP receptor (AVPR2) gene (location Xq28). This mutation leads to constant activation of the AVPR2 receptor on renal collecting duct cells, which causes an increase in free water reabsorption and an increase in urine concentration. An X-linked disorder affecting mainly males with females often being asymptomatic carriers.
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A very rare genetic disorder of water balance, closely resembling the far more frequent syndrome of inappropriate antidiuretic secretion (SIAD) characterized by hypotonic hyponatremia due to impaired free water excretion and undetectable or low plasma arginine vasopressin (AVP) levels. Symptoms are the classical symptoms of hyponatremic encephalopathy such as nausea, vomiting, dizziness and gait disturbances. Caused by a gain of function mutation in the type 2 AVP receptor (AVPR2) gene (location Xq28). This mutation leads to constant activation of the AVPR2 receptor on renal collecting duct cells, which causes an increase in free water reabsorption and an increase in urine concentration. An X-linked disorder affecting mainly males with females often being asymptomatic carriers.
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