Figure 7. Ontogeny of mRNAs for
gpd-3 and
gpd-1. Total RNA from the designated embryonic (E), 1st larval (L1), 2nd larval (L2) and 4th larval (L4) stage were purified and separated on agarose as described in Materials and Methods. Poly(A)' RNA was purified from total embryo RNA by oligo(dT)-cellulose chromatography (E+). RNA molecular weight standard markers were obtained from Bethesda Research Laboratories. RNA (10 g) was applied to each lane. (a) Upon transfer to a nitrocellulose filter, the panel of RNAs were hybridized with a probe specific for
gpd-3. The gene specific probe for
gpd-3 was made by primer extension of pSB (Fig. 3) using an oligonucleotide located 240 bp downstream from its termination codon, which extended to a HaeIII site located 5 bp before its stop codon. (b) A duplicate filter was challenged with a probe specific for
gpd-1. The gene-specific probe for
gpd-1 was made by primer extension of plasmid pSE3' (Fig. 1(a)) using an oligonucleotide primer 180 bp downstream from its termination codon. The extension was extended to a Sau3A site located 10 bp beyond the termination codon.