In Lysosomal storage disorders, true is
**Core Concept**
Lysosomal storage disorders are a group of genetic conditions caused by deficiencies in lysosomal enzymes, leading to the accumulation of undigested substrates within lysosomes. This accumulation results in cellular dysfunction and organ damage due to the toxic effects of the accumulated substances.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of lysosomal storage disorders. These disorders are caused by mutations in genes encoding lysosomal enzymes, such as alpha-L-iduronidase in Hurler syndrome or beta-glucocerebrosidase in Gaucher disease. The deficiency of these enzymes leads to the accumulation of their respective substrates, resulting in cellular dysfunction and tissue damage. For example, in Hurler syndrome, the accumulation of dermatan sulfate and heparan sulfate leads to the degradation of glycosaminoglycans, causing cellular dysfunction and organ damage.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the pathophysiology of lysosomal storage disorders. While it is true that these disorders are caused by genetic mutations, the specific mechanism of the disorder is related to enzyme deficiency, not just genetic mutation.
**Option B:** This option is incorrect because it is not specific to lysosomal storage disorders. While it is true that these disorders can cause cellular dysfunction and organ damage, this is a general statement that could apply to many different types of conditions.
**Option C:** This option is incorrect because it is not a characteristic of lysosomal storage disorders. While these disorders can cause a range of symptoms, including developmental delays and intellectual disability, they are not typically associated with the specific symptom of "excessive urination."
**Option D:** This option is incorrect because it is not a characteristic of lysosomal storage disorders. While these disorders can cause a range of symptoms, including skin abnormalities and joint pain, they are not typically associated with the specific symptom of "excessive sweating."
**Clinical Pearl / High-Yield Fact**
A key aspect of lysosomal storage disorders is the accumulation of undigested substrates within lysosomes, leading to cellular dysfunction and organ damage. This accumulation can be visualized using techniques such as electron microscopy or biochemical assays, which can help diagnose these conditions.
**Correct Answer: B. Lysosomal storage disorders are caused by mutations in genes encoding lysosomal enzymes.**