Aging Phenotypes of Common Marmosets (Callithrix jacchus).

Area of Science:

• Gerontology
• Comparative Medicine
• Primate Models

Background:

• Translational aging research requires suitable animal models to understand human health and disease.
• Short-lived primates, like marmosets, offer a valuable opportunity to study age-related changes efficiently.

Purpose of the Study:

• To characterize age-associated phenotypic changes in marmosets.
• To determine if these phenotypes correlate with mortality risk.
• To establish a foundation for marmoset translational aging research.

Main Methods:

• Assessment of body composition, hematology, and morphometric measures in conventionally housed marmosets.
• Analysis of phenotypic data in relation to chronological age and risk of death.

Main Results:

• Older marmosets showed decreased fat mass, reduced morphometric measures, and lower serum albumin levels.
• Mortality in older marmosets was more frequently linked to cardiac and chronic kidney disease.
• A modified resting posture in older marmosets was significantly associated with an increased risk of imminent death.

Conclusions:

• Phenotypic characterization provides an initial definition of aged health in marmosets.
• Marmosets serve as a relevant model for studying aging and age-related diseases.
• These findings support the use of marmosets in future translational aging research.