Dietary restriction (DR) is the most validated method of extending longevity and slowing aging in rodents. Multiple physiological responses are seen after imposition of DR and many of these have been put forth as potential causal factors in producing the life-extension benefits of DR. We have found that several of the physiological effects of DR have a substantial genetic component and are amenable to genetic analysis. Moreover, several of these traits are specified by distinct sets of genes. We propose to use this substantial body of preliminary results to establish a relationship within and among various traits that respond to DR and to establish the relationship between these traits and the longevity-extension that is the hallmark of DR. We propose to map the genes (QTLs) underlying these traits and determine whether DR-induced life extension is genetically associated with one or more of these responses, consistent with a causal relationship. Phrasing this as a hypothesis, we propose that there are identifiable QTLs that underlie variation in the physiological responses to DR and that some of these QTLs are associated with significant life extension in response to DR. Using the LSXSS RI panel, we have obtained preliminary data for several responses to DR, including lowered body temperature, reduced body weight, slower growth rate, and reduced female fertility during DR and extended female fertility after restoring ad lib (AL) conditions. Additional studies to further these findings are underway. Here we propose to identify and map QTLs specifying life span and end-of-life pathology under both AL and DR conditions. We also will assess levels of blood glucose, insulin, and IGF-1 and map QTLs for these traits. These QTLs will be mapped using the LXS RI strains, a new RI set and the largest set of RIs ever constructed (77 strains).

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
1R01AG024354-01
Application #
6818198
Study Section
Special Emphasis Panel (ZAG1-ZIJ-5 (M3))
Program Officer
Finkelstein, David B
Project Start
2004-09-30
Project End
2009-06-30
Budget Start
2004-09-30
Budget End
2005-06-30
Support Year
1
Fiscal Year
2004
Total Cost
$332,177
Indirect Cost
Name
University of Colorado at Boulder
Department
Genetics
Type
Other Domestic Higher Education
DUNS #
007431505
City
Boulder
State
CO
Country
United States
Zip Code
80309
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