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Is poly(A) tail length altered by aging or dietary restriction?
B S Kristal1, C C Conrad, A Richarson
1Department of Physiology, University of Texas Health Science Center, San Antonio 78284-7756.
Gerontology
|January 1, 1993
Summary
This study found no age-related decrease in RNA poly(A) tail length in male Fischer 344 rats. Dietary restriction also did not impact poly(A) tail length, suggesting its stability across aging and diet interventions.
Area of Science:
- Molecular Biology
- Aging Research
- Biochemistry
Background:
- Poly(A) tail length is a crucial regulator of RNA stability and translation.
- Age-related changes in poly(A) tail length are hypothesized but not well-established.
- Dietary restriction is known to influence aging processes.
Purpose of the Study:
- To investigate age- and diet-related alterations in RNA poly(A) tail length.
- To determine if poly(A) tail length changes with age in male Fischer 344 rats.
- To assess the impact of dietary restriction on poly(A) tail length and its age-related dynamics.
Main Methods:
- High-resolution gel electrophoresis.
- Northern hybridization with oligo(dT) probes.
- Analysis of RNA from liver and hypothalamus of male Fischer 344 rats.
Main Results:
- No age-related decrease in RNA poly(A) tail length was observed.
- A slight age-related increase in poly(A) tail length was detected in liver and hypothalamus.
- Dietary restriction did not alter poly(A) tail length or its age-related changes.
Conclusions:
- RNA poly(A) tail length is stable during aging in male Fischer 344 rats.
- Oligo(dT) probes are reliable for standardizing RNA hybridization across age and diet groups.
- The ratio of RNA polymerase I to RNA polymerase II activity remains constant with age.