Different Expression of Rat Aldolase A MRNA in the Skeletal Muscle and Ascites Hepatoma Cells

Rat aldolase A mRNAs from the skeletal muscle and ascites hepatoma cells are compared by RNA blot hybridization. The hepatoma AH60C and AH130 mRNA are about 1600 bases long, some 50 bases longer than the skeletal muscle transcript. Aldolase A enzymes encoded by these mRNAs, however, are indistinguishable in electrophoresis on cellulose polyacetate strips and two-dimensional polyacrylamide gel. In addition, comparison of the thermal stability of hybrids between the mRNAs from the skeletal muscle and hepatoma cells and a cDNA probe (pRAAM83) made from the aldolase A mRNA of the skeletal muscle indicate that the mRNAs have extremely high sequence homology, at least, within the most part of coding region in addition to the 3' noncoding region. These findings indicate that these mRNA may be transcribed by the use of different promoter sites and the common structural gene.