Eth-A gene mutation can lead to cross resistance of Ethionamide with:
Eth-A gene encodes Monoxygenase enzyme that activates both Ethionamide and Thioacetazone. Therefore mutation of Eth-A gene is responsible for resistance in both Ethionamide and Thioacetazone.
PAS
Isoniazid
Ethambutol
Thioacetazone