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[Age-dependent avidin induction. V. Changes on the level of post-transcriptional modification]
Aktuelle Gerontologie
|August 1, 1979
Summary
Aging reduces avidin induction in quail oviducts by affecting post-transcriptional events. Progesterone treatment impacts RNA polymerase II and mRNA processing differently in young versus old birds.
Area of Science:
- Molecular Biology
- Developmental Biology
- Avian Physiology
Context:
- Avidin induction in quail oviducts is crucial for egg white formation.
- Age-dependent decline in avidin induction has been observed.
- Post-transcriptional regulation is a key factor in gene expression control.
Purpose:
- To investigate the molecular mechanisms underlying age-dependent reduction of avidin induction.
- To analyze the role of post-transcriptional events in quail oviducts.
- To compare the effects of progesterone treatment on gene expression in young and old quails.
Summary:
- Estrogen-treated young quails showed a 145% increase in DNA-dependent RNA polymerase II activity after progesterone, unlike old animals.
- mRNA processing, indicated by [3H]Ado/[3H]Urd incorporation, increased by 80% in mature quails but only 15% in old ones.
- Poly(A)-degrading enzyme activity was lower in mature than old quails; progesterone increased it in old animals, with no change in young ones.
Impact:
- Findings suggest age-related alterations in mRNA stability and poly(A) tail length affect translation capacity.
- This research provides insights into the molecular basis of aging in reproductive tissues.
- Understanding these mechanisms can inform strategies to maintain reproductive function in aging animals.