HuT mice
HuT mice, a genetically modified mouse strain, harbor a humanized mouse telomerase gene, hmTert. These mice exhibit an average telomere length of around 10 kilobases. Notably, their telomere homeostasis mirrors that of humans: where as telomerase is mostly absent in adult mouse tissues, the average telomere length in HuT mice is similar or shorter than human telomeres.
Replicative senescence
Replicative senescence refers to the phenomenon where cells lose their ability to divide and proliferate after a certain number of cell divisions, resulting in a state of growth arrest or cellular aging. This process is mechanistically triggered by a DNA damage response caused by telomere dysfunction. As normal somatic cells undergo division, their chromosome ends (telomeres) undergo gradual shortening, eventually leading to their dysfunction. Notably, this mechanism serves as an important suppressor of tumorigenesis in humans.
Telomere Shortening
Dysfunctional telomeres impair tissue regeneration and suppress tumor development in humans.
The Uses of HuT mice
HuT mice are valuable tools for investigating not only the influence of telomere length on the aging process but also for assessing the environmental factors that contribute to human aging. Researchers can utilize HuT mice to delve into the complex interplay between genetics, telomere length, and environmental factors, shedding light on the intricate mechanisms underlying human aging.
In HuT mice, shortened telomeres have been observed to suppress tumor development. Notably, telomerase activation is a requisite factor for the occurrence of most cancers in both human and HuT mouse models.
Short telomeres contribute to the onset of age-related degenerative diseases in humans and HuT mice. HuT mice with humanized short telomeres can offer a more accurate model for the onset and treatment of age-related human degenerative diseases compared to wild type mice with much longer telomeres
Shortened telomeres significantly impact the maintenance of tissue equilibrium and the capacity for damage repair following exposure to harmful substances. Mice with humanized telomeres represent a credible preclinical model for investigating drug toxicity effects.