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Background  In insects, hemocyanin superfamily proteins accumulate apparently to serve as sources of amino acids during metamorphosis, reproduction and development. Storage hexamerins are important members of the hemocyanin superfamily. Although insects possess storage hexamerins, very little is known about the character and specific functions of hexamerin 1 and storage protein 1 in insect development.    Results  To gain insight into the function of storage proteins in insects, cDNAs for two storage proteins were cloned from the fat body of  Spodoptera exigua .  S. exigua  hexamerin 1 ( SeHex ) cDNA contained an open reading frame of 2124 nucleotides encoding a protein of 707 amino acids with a predicted molecular weight of 82.12 kDa.  S. exigua  storage protein 1 ( SeSP1 ) cDNA contained an open reading frame of 2256 bp encoding a protein of 751 amino acids with a predicted molecular weight of ~88.84 kDa. Northern blotting analyses revealed that  SeHex  mRNA is expressed in the fat body, cuticle, midgut and Malpighian tubules and  SeSP1  in fat body, Malpighian tubules and tracheae.  SeHex  and  SeSP1  mRNAs were expressed in fat body at different levels from first instar larvae to pupae, with expression was much lower from first instar larvae to first-day fifth instar larvae.  SeHex  transcript expression was high in fat body of wandering larvae (pre-pupae) and steadily decreased to the seventh pupal day.  SeSP1  transcript expression was high in fat body of wandering larvae, 2-day-old fifth instar larvae and 2-, 4- and 7-day-old pupae.  SeHex  and  SeSP1  mRNAs levels were expressed lower than control on the condition of starvation at 12 h. Of insects injected with SeHex and SeSP1 dsRNA, 38.7% and 24.3% survived to 204 h after treatment, respectively. This was significantly lower than in the controls groups.    Conclusions  These findings provide new data on the tissue distribution, expression patterns and the function in starvation of storage proteins. RNA interference results revealed that storage protein genes are key in metamorphosis, reproduction and insect development. The results for  SeHex  and  SeSP1  interference reveal that a potential method to control this pest is to disrupt the regulation of storage proteins.

Two storage hexamerins from the beet armyworm Spodoptera exigua: Cloning, characterization and the effect of gene silencing on survival