How do biochemical genetic tests detect inherited disorders?

Biochemical genetic tests detect inherited disorders by identifying enzymatic defects and analyzing the substrates and products of gene-controlled reactions. These tests are primarily used to diagnose inborn errors of metabolism, which occur when a mutated gene results in the reduced activity or complete absence of an enzyme necessary for normal metabolic pathways.123

To detect these abnormalities, clinicians employ several specialized techniques:

• Metabolite Analysis: Tests often involve the isolation and quantitation of relevant metabolites found in blood and urine samples.3
• Analytical Methods: Techniques such as chromatography, electrophoresis, and mass spectrometry are used to separate and identify specific chemical components or proteins.23
• Cellular Analysis: Biochemistry is performed at the cellular or subcellular level, often using cell extracts to reveal inherited differences in protein structures.2

By identifying these biochemical signatures, medical professionals can diagnose conditions like phenylketonuria and galactosemia early, allowing for timely interventions such as diet therapy to prevent severe health consequences.123