mutant
adjective /ˈmjuːtənt/
  /ˈmjuːtənt/
(biology)- (of a living thing) different in some way from others of the same kind because of a change in its genetic structure
- a mutant gene
 - a mutant strain of the virus
 
Oxford Collocations DictionaryMutant is used with these nouns:- gene
 - strain
 
Word Originearly 20th cent.: from Latin mutant- ‘changing’, from the verb mutare.