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This study showed that 300 μW/cm2 UV irradiation for 5 min could inactivate 94.63% ofHAV. No obvious changes were found experimentally under this irradiation dose, other than the decrease of RNA transfection ability. After 20 min UV irradiation, all of HAV were inactivated. For the RNA sedimentation, the original single UV absorption peak (32.9S) became two (11 S and 15.2S) after the irradiation. The fragment of 5’-untranslated region (HAV RNA 222~ 819) could not be detected with RT-PCR. The RNA transfection became negative. But the fragment of P1 region (HAV RNA 2823~3049) could still be detected with RT-PCR, the hybridhation shadow of 3’-terminal poly(A) tail with oligo(dT) probe labelled with γ-(32)P also became slightly lighter, and no obvious changes were found in the antigenicity of HAV detectedwith ELISA and in 4 capsid polypeptides which was separated by 15% SDS-polyacrylamide gel containing 4 mol/L urea. It implied that the attack target of UV on HAV was nucleic acid. Besides the formation of pyrimidine dimers which is generally recognized, UV irradiation may cause break of HAV RNA chain, especially 5’-terminal untranslated region associated with HAV infectlvity.
This study showed that 300 μW / cm2 UV irradiation for 5 min could inactivate 94.63% of HAV. No obvious changes were found experimentally under this irradiation dose, other than the decrease of RNA transfection ability. After 20 min UV irradiation, all of HAV were inactivated The fragment of 5’-untranslated region (HAV RNA 222-819) could not be detected with RT The RNA transfection became negative. But the fragment of P1 region (HAV RNA 2823-3049) could still be detected with RT-PCR, the hybridization shadow of 3’-terminal poly (A) tail with oligo (dT) probe It was slightly impaired, and no obvious changes were found in the antigenicity of HAV detected with ELISA and in 4 capsid polypeptides which was separated by 15% SDS-polyacrylamide gel containing 4 mol / L urea. It implied that the attack target of UV on HAV was nucleic acid. Bes ides the formation of pyrimidine dimers which is generally recognized, UV irradiation may cause break of HAV RNA chain, especially 5’-terminal untranslated region associated with HAV infectvity.