A Cell Line Carrying a Mutation in a Single Gene

question 11

Essay

A cell line carrying a mutation in a single gene is found to express very low levels of MHC class I on its surface. When infected with influenza virus, these cells are not recognized nor are they killed by a CD8 T cell line specific for an influenza peptide bound to the MHC class I protein expressed by these cells. Incubation of the mutant cell line with a large excess of this peptide in the cell culture medium overnight leads to the results shown in
What is the most likely candidate for the gene that is defective in the mutant cell line?

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