Hyperammonemia type I is due to deficiency of
**Question:** Hyperammonemia type I is due to deficiency of
A. Glutamic Oxaloacetic Transaminase (GOT or SGOT)
B. Glutamic Pyruvic Transaminase (GPT or SGPT)
C. Alanine Aminotransferase (ALT)
D. Lactate Dehydrogenase (LDH)
**Correct Answer:**
**Core Concept:** Hyperammonemia is an elevated blood ammonia level, which can be caused by various factors such as genetic disorders, liver diseases, or medications. In this case, we are focusing on the genetic disorder, specifically Type I Hyperammonemia.
**Why the Correct Answer is Right:**
Hyperammonemia type I is due to deficiency of Glutamic Oxaloacetic Transaminase (GOT or SGOT). GOT is an enzyme involved in the citric acid cycle and the urea cycle, which plays a crucial role in ammonia detoxification. In Type I Hyperammonemia, the deficiency of GOT leads to an impaired ability to detoxify ammonia, resulting in elevated blood ammonia levels.
**Why Each Wrong Option is Incorrect:**
A. Glutamic Pyruvic Transaminase (GPT or SGPT) is not the correct answer because it is another transaminase enzyme involved in the urea cycle, but it is not specifically responsible for ammonia detoxification.
B. Alanine Aminotransferase (ALT) is incorrect as it is another transaminase enzyme involved in the urea cycle but is not directly related to ammonia detoxification.
C. Lactate Dehydrogenase (LDH) is not the correct answer because LDH is involved in the glycolytic pathway, and its deficiency does not cause ammonia detoxification problems.
**Clinical Pearl:**
Understanding the correct answer and its function is essential in differentiating between the various types of Hyperammonemia. Type I Hyperammonemia, caused by GOT deficiency, is commonly seen in urea cycle disorders, particularly in individuals with ornithine transcarbamylase deficiency, which is an enzyme involved in the urea cycle.
**Correct Answer:** D. Glutamic Oxaloacetic Transaminase (GOT or SGOT)
**Why the Correct Answer is Right:** GOT (or SGOT) is an enzyme involved in the urea cycle, specifically catalyzing the reversible conversion of glutamate and oxaloacetate to Ξ±-ketoglutarate and Ξ±-aminoadipate. GOT deficiency leads to impaired ammonia detoxification, resulting in Hyperammonemia.
**Why Each Wrong Option is Incorrect:**
A. GPT (or SGPT) is another transaminase enzyme involved in the urea cycle, but it is not specifically responsible for ammonia detoxification.
B. ALT (or SGPT) is another transaminase enzyme involved in the urea cycle, but it is not directly related to ammonia detoxification.
C. LDH (or L