Lysosomal a1 – 4 and a1 – 6 glucosidase deficiency is seen in
**Core Concept**
Lysosomal storage diseases result from deficiencies in enzymes responsible for breaking down complex molecules within lysosomes. The specific deficiency of lysosomal α-1, 4 and α-1, 6 glucosidase leads to an accumulation of glycogen, specifically the short-chain α-1, 6 linked glycogen, in various tissues.
**Why the Correct Answer is Right**
The correct answer involves a deficiency in the enzyme acid α-glucosidase (also known as acid maltase), which is essential for the breakdown of glycogen in lysosomes. This enzyme is responsible for the hydrolysis of α-1, 4 and α-1, 6 glycosidic bonds in glycogen, preventing its accumulation in muscles. The deficiency of this enzyme leads to Pompe disease, a rare genetic disorder characterized by the progressive accumulation of glycogen in muscle cells, resulting in muscle weakness, hypertrophy, and eventually, heart failure.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not pertain to the specific enzyme deficiency described in the question.
* **Option B:** This is incorrect because it refers to a different enzyme and disease, glycogen storage disease type II, which is not characterized by the specific enzyme deficiency described.
* **Option C:** This option is incorrect as it does not match the enzyme deficiency described in the question, which is specific to α-1, 4 and α-1, 6 glucosidase.
**Clinical Pearl / High-Yield Fact**
Pompe disease is characterized by the accumulation of glycogen in muscle cells, leading to progressive muscle weakness and hypertrophy. It is a rare genetic disorder that can be diagnosed through genetic testing and confirmed through muscle biopsy.
**Correct Answer: A. Pompe disease**