[Age-dependent gene induction in the quail oviduct. VIII. A survey of experimental data].

1974 we introduced the biological model of the progesterone-caused avidin biosynthesis in the quail oviduct for studies in the field of molecular gerontology. Using this model it is possible to determine quantitatively the biochemical events of the age-dependent reduction of the progesterone-caused gene-induction. In a series of experiments it was found that the main parameters of the age dependent reduction might be found on the level of transcription and post-transcription. Therefore the enzymic processes involved in the transcription of genetic information from the DNA to the heterogenous nuclear RNA as well as those processing this RNA species to mRNA are studied. During the progress in this field we could isolate and purify some enzymes (poly[A] nucleases) which are involved in the age-dependent "maturation" of mRNA. On the basis of the interrelation between the poly(A)-binding proteins and the specific poly(A) nucleases, an explanation of the age-dependent reduction of the progesteron-caused mRNA synthesis seems to be possible.