Which of the following is associated with adult polycystic kidney disease –
**Core Concept**
Adult polycystic kidney disease (APKD) is a genetic disorder characterized by the growth of numerous cysts in the kidneys, leading to progressive renal dysfunction. The underlying mechanism involves the mutation of the PKD1 or PKD2 gene, which encodes for polycystin-1 and polycystin-2 proteins, respectively.
**Why the Correct Answer is Right**
The correct answer is associated with the pathophysiology of APKD, where the mutation of the PKD1 or PKD2 gene leads to the loss of function of polycystin-1 or polycystin-2, respectively. These proteins normally regulate cell growth, cell polarity, and ion transport across the cell membrane. The loss of function of these proteins results in the development of cysts in the kidneys, which gradually increase in size and number, leading to renal impairment.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not directly associated with the pathophysiology of APKD. While it may be related to kidney function, it is not a characteristic feature of APKD.
**Option B:** This option is incorrect because it is a consequence of APKD, rather than a direct cause. Renal failure is a complication of the disease, but it is not the primary association.
**Option C:** This option is incorrect because it is a risk factor for kidney disease in general, but it is not a specific association with APKD.
**Clinical Pearl / High-Yield Fact**
The presence of a family history of APKD is a significant risk factor for developing the disease, and individuals with a family history should undergo regular screening and monitoring for the development of kidney cysts.
**Correct Answer: D.**