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How can a defective enzyme cause an inherited metabolic disease?
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Biochemistry
In biochemistry, researchers study the chemical substances and processes that occur in living organisms and cells. In particular, various processes by which cells gain energy, such as epinephrine-stimulated cAMP synthesis, have been deduced through the study of biochemistry.
An inherited metabolic disease occurs when a genetic mutation results in a defective or missing enzyme, disrupting the body's metabolic pathways.
In a healthy system, enzymes act as catalysts that convert specific substrates into necessary products through a series of sequential steps. When an enzyme is defective, this chain is blocked, leading to two primary pathological consequences:
- Deficiency of essential products: If an enzyme cannot catalyze its reaction, the final product of that pathway may not be formed, causing a deficiency that impairs vital bodily functions.12
- Toxic accumulation: The substrate that the defective enzyme was meant to process may accumulate to toxic levels. Additionally, this buildup can activate dormant, minor metabolic pathways, potentially creating new, harmful substances.13
These disorders, often called inborn errors of metabolism, are typically inherited through autosomal recessive patterns, though dominant and sex-linked inheritance also occur. The resulting metabolic imbalance can cause severe damage to tissues, particularly the brain, leading to conditions such as phenylketonuria or albinism.312