Molecular Genetic Mechanisms in Development and Aging by Morris Rockstein

By Morris Rockstein

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We prefer as a working hypothesis that some protein of the replication machinery is synthesized only at the beginning of the instar, and that this protein is stable and remains operative in some or all of the subsequent replication cycles. Its synthesis requires the concurrent synthesis of RNA. The few RHlarvae which escape the drug effects may be those in which the required macromolecules already had been produced. This is supported by the fact that older RH-larvae are less sensitive than younger ones.

The genetic material of these cells multiplies many times during their growth, leading to the giant and highly polyploid cells characteristic of many insect larvae. In many cases the cells which have "opted" for growth during the larval stages are those destined for death once metamorphosis has begun. 33 ULRICH CLEVER The cells of the larval salivary glands of Chironomus tentans belong to this group. A pair of these glands is formed during embryonic development, each gland consisting of approximately 40 to 45 cells.

Thus, it would appear that the enzyme protein responsible for the high proteolytic activity at cytolysis is synthesized in an inactive 50 GENETIC MECHANISMS OF AGING form in mid-prepupae. Since the effect of ecdysone on zymogen accumulation is prevented by actinomycin (Table 3), it would also appear that the synthesis of this protein requires the concurrent or shortly preceding synthesis of RNA. However, tempting as they may be, these conclusions have to be considered tentative at the moment. The use of immunochemical methods would be required to verify them by determining the actual amounts of enzyme protein at any given stage.

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