Sequence complexity of polyadenylated RNA from seizure-susceptible El mouse brain polysomes

The hybridization kinetics in the complementary DNAs (cDNA) to polyadenylated messenger RNA (mRNA) in the brain of seizure-susceptible El mice were examined to elucidate the correlation between seizure susceptibility and genetic expression. Homologous and heterologous saturation hybridizations indicated that cDNA of seizure-nonsusceptible ddY mice hybridized with less mRNA in seizure-experienced E1(+) or seizure-nonexperienced E1(o) mice than that in ddY mice, cDNA of E1(+) mice hybridized to a lesser extent with mRNA of E1(o) mice than that of ddY or E1(+) mice, and no difference was observed with cDNA hybridization results of E1(o) mice to individual mRNAs of ddY, E1(+) or E1(o) mice. The results suggest that some sequences found in mRNA of ddY are lacking in both E1 strains and are responsible for the inbred predisposition, while those present in E1(+) mRNA but missing in E1(o) may associate with seizure susceptibility, since common sequences are present in the mRNA of those groups of animal. The sequence diversity among the 3 groups of mice was mainly observed with the rare class of mRNA. Molecular cloning of the cDNA corresponding to this class of mRNA found in the E1(+) mice would clarify the gene expression in the brains of epileptics.