A research paper, titled “Causal effects of inflammation on long-term mortality: A mendelian randomization study” was published in Volume 18 of Aging-US by an international team of researchers, provides a definitive answer by using a powerful genetic technique to untangle cause from effect.
Aging-US Research
The aging of an organism is reflected not only in the function of its organs but also in the molecular signatures written into its cells. For years, scientists have cataloged the changes in protein-coding genes and various non-coding RNAs that occur as we grow older.
In this study, titled “Single-cell transcriptomics reveal intrinsic and systemic T cell aging in COVID-19 and HIV” and published in Volume 18 of Aging-US, researchers used single-cell RNA sequencing to analyze aging-related changes in human T cells.
Aging reshapes the immune system in two fundamental ways: it alters the proportions of different immune cell types circulating in the blood, and it induces molecular changes within each individual cell.
Aging-US sincerely thanks all reviewers who contributed their expertise and time during 2025.
Aging has long been explained in different ways. One traditional view is that it results from the gradual accumulation of molecular damage over time. Another perspective, based on evolutionary theory, suggests that natural selection strongly protects health during youth and reproductive years but becomes less effective later in life.
Since the first description of replicative senescence triggered by telomere shortening in the 1960s, other stressors such as mitochondrial dysfunction and DNA damage were shown to induce senescence in vitro. In vivo, senescent cells show both beneficial physiological and harmful pathological roles, yet their contribution to aging and disease remain incompletely understood.
While maternal health has traditionally been central to research on pregnancy and child development, there is growing recognition that paternal factors also play a role, particularly the father’s age. Several studies have found a modest increase in risk of neurodevelopmental conditions, including autism spectrum disorder, among children born to older fathers. However, the biological mechanisms underlying this association are still not fully understood.