Molecule-to-patient case packet

Patient A's test history, traced from molecule to decision:

• DNA sequencing of the suspect gene: molecular evidence was the exact base sequence showing a single-base change (a SNP). Validity mattered most here, because the test had to read the specific disease-linked SNP, not a random nearby marker.
• Repeat sequencing on a fresh sample: molecular evidence was the same SNP appearing again. Reliability mattered most here, because getting the same result twice raised clinical confidence that the first read was not a lab error.
• Protein activity assay: molecular evidence was reduced enzyme activity, consistent with the SNP changing the protein. Validity mattered, because the assay had to measure the enzyme the disease actually affects.

Most influential result: The confirmed, repeated SNP read was the result that most influenced the clinical decision, because once the disease-linked change was both valid and reliable, the doctor could act on it as a clinical fact rather than a single uncertain reading.