Computational method for predicting the contribution of mutations to the drug resistance phenotype exhibited by hiv based on a linear regression analysis of the log fold resistance

A method for quantitating the individual contribution of a mutation or combination of mutations to the drug resistance phenotype exhibited by HIV, said method comprising the step of performing a linear regression analysis using data from a dataset of matching genotypes and phenotypes,

• wherein the log fold resistance, pFR, of each HIV strain is modelled as the sum of all the individual resistance contributions for each of the mutations or combinations of mutations that occur in HIV according to the following equation;
• wherein each individual resistance contribution is calculated by multiplying a mutation factor, MA, MB, . . . , MZ, for each mutation or combination of mutations by a resistance coefficient βA, βB, . . . , βZ;
• wherein for a combination of mutations, the mutation factor Mn represents the co-occurrence of one mutation with other one or more mutations and the coefficient βn represents the synergy or antagonism between the one mutation with the other one or more mutations;
• wherein the mutation factor assigned to each mutation or combination of mutations reflects the degree to which that mutation or combination of mutations is present in the HIV strain and, if present, to which degree the mutation is present in a mixture;
• wherein each resistance coefficient reflects the contribution of the mutation or combination of mutations to the fold resistance exhibited by the strain;
• and wherein the error term ε, represents the difference between the modelled prediction and the experimentally determined measurement.