Mouse liver and salivary gland α -amylase mRNAs differ only in 5′ non-translated sequences

The sequence of the 1,773-nucleotide major and 1,806-nucleotide minor mouse liver α-amylase mRNAs differ only with respect to approximately 30 additional residues at the extreme 5′ terminus of the minor species. Comparison of the liver α-amylase mRNAs with their salivary gland counterpart reveals that these mRNAs share identical coding and 3′-noncoding sequences, but contain distinct 5′-terminal residues. These data suggest that all three mRNAs might be transcribed from the same gene.