RESUMEN
Hepatitis C virus (HCV) infection is a considerable public-health problem and an important cause of liver disease with about 71 million people infected worldwide and more than 399 000 people die every year from hepatitis C-related liver diseases. The present study was, therefore, initiated to investigate the association of polymorphism in interferon λ3 (IFNL3) also known as interleukin-28B (IL-28B) gene with chronic HCV infection and association of these polymorphic variants with the combination daclatasvir and sofosbuvir HCV therapy response. Genotypes were determined by the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay in a total of 250 chronic HCV genotype three patients and 500 number of healthy controls. Our data revealed that the TT (minor) genotype of IFNL3 (rs12979860) and GG (minor) genotype of IFNL3 (rs8099917) exhibited a significant association with chronic HCV genotype 3 infection when compared with controls. The results of treatment response showed that CC (major) genotype of IFNL3 (rs12979860) and TT (major) genotype of IFNL3 (rs8099917) are associated with the likelihood of achieving a higher sustained virological response (SVR), to combined daclatasvir and sofosbuvir therapy, in genotype 3-infected HCV patients, whereas the individuals with TT (minor) genotype of IFNL3 (rs12979860) and GG (minor) genotype of IFNL3 (rs8099917) are more susceptible to chronic HCV infection and treatment relapse, suggesting a role of IFNL3 (rs12979860) and (rs8099917) in the treatment outcome of combined daclatasvir and sofosbuvir therapy in chronic HCV genotype 3 infection.