t-likely-net-effect-on-viral-population-fitness-and-drug-sensitivity-in-patients

Question

A point mutation arises in the active site of an RNA virus protease, lowering affinity for a widely used protease inhibitor but also reducing catalytic efficiency by 40%. What is the most likely net effect on viral population fitness and drug sensitivity in patients?

Accepted Answer

Partial drug resistance may emerge because inhibitor binding is reduced, but viral fitness will be compromised due to less efficient polyprotein cleavage, potentially limiting spread compared to wild-type virus.

Answer

No change in clinical outcome because protease inhibitors never affect viral replication dynamics, so mutations in protease have no impact on drug sensitivity or fitness.

Answer

Immediate elimination of the virus by host immunity, because mutations in protease active sites universally expose viral epitopes to antibodies that clear infection within hours.

Answer

Complete restoration of viral fitness because any mutation that reduces inhibitor binding always produces compensatory increases in replication speed and overall infectivity.