Compositional and transcriptional changes in the hematopoietic system have been used as biomarkers of immunosenescence and aging. Here, researchers use single-cell RNA-sequencing to study the aging peripheral blood in mice and characterize the changes in cell-type composition and transcriptional profiles associated with age.

To gain deeper insights into age-related muscle loss, the researchers performed transcriptome profiling on lower limb muscle biopsies from 72 young, elderly, and frail human subjects using bulk RNA-seq (N = 72) and single-nuclei RNA-seq (N = 17)…