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Double-stranded DNA complementary to poly(A)-containing RNA from the fat body of adult female locusts, Locusta migratoria, was synthesized. Hybrid molecules containing this cDNA was constructed in the PstI site of the plasmid pAT 153 by the technique of dC . dG tailing and amplified in Escherichia coli K-12 strain HB 101. Ten colonies of bacteria were identified as carrying recombinant plasmids containing DNA complementary to locust vitellogenin mRNA by (a) 'Northern' blot hybridization analysis and (b) hybrid selection of vitellogenin mRNA and immunological detection of the products of translation of the mRNA. Of the ten recombinant plasmids, one, termed plasmid 4E, containing a cDNA insert of about 650 nucleotides, was characterized in greater detail and a partial restriction map obtained. Using this hybrid plasmid it was possible to derive a value for the average content of vitellogenin mRNA in the adult female locust fat body as 1.5 x 10(5) molecules/cell, and to establish that the haploid genome of L. migratoria contains only one or two genes coding for vitellogenin.

Construction and partial characterization of a recombinant DNA probe for locust vitellogenin messenger RNA.