Identification of the 5′ terminal sequence of the SAR‐55 and MEX‐14 strains of hepatitis E virus and confirmation that the genome is capped

Abstract

Hepatitis E virus (HEV) is a nonenveloped virus with a genome of single-stranded, positive-sense RNA. The 5' terminal sequence of two HEV strains (SAR-55 and MEX-14) was determined by a 5' RNA ligase-mediated rapid amplification of cDNA ends (RACE) method designed to select capped RNAs. The 5' noncoding region of the SAR-55 and MEX-14 strains were amplified, confirming that the genomic RNA of HEV is capped. The 5' noncoding region of the SAR-55 strain had 25 nucleotides, which is two less than reported for the Burmese strain, and that of the MEX-14 strain had 24 nucleotides, which is 21 more than reported previously [Huang et al., 1992].