Experimental organisms articles from across Nature Portfolio

The demand for kidney transplants is far from met by human donors — a problem that may be solved by the clinical translation of porcine kidney xenotransplantation. A new paper describes the development of genetically ‘humanized’ pigs, the kidneys of which kept nephrectomized cynomolgus macaques alive for up to 2 years.

Innate immune responses to mRNA vaccines are less well understood than adaptive immunity. Here, the authors comprehensively characterize the innate and adaptive immune responses to mRNA-1273 vaccinations in rhesus macaques and show how the vaccine activates interactions among components of the two systems.

Next-generation red and green G-protein-coupled receptor-based dopamine sensors with improved properties have been developed. Their performance is demonstrated in cell culture, in brain slices and in vivo in the mouse.

Environmental enrichment is a home-based intervention that mimics natural habitats for laboratory-housed animals. This systematic review of 27 environmental enrichment protocols finds consistent benefits for zebrafish welfare while raising the importance of a standardizing protocol to improve reproducibility of results.

Host-parasite interactions can lead to negative frequency-dependent selection. Here, the authors sequence the genomes of H. bakeri and H. polygyrus, parasites of house and wood mice, respectively, and find that proteins that interact with the host immune response are often highly diverse.

Using a microfluidic single-cell aging platform, the authors report how single-cell lifespan varies across more than 300 yeast strains, each missing a single gene. Their top hit, Sis2, was found to regulate yeast lifespan in a dose-dependent fashion.

A deep learning-based method that uses microscopy images to stage embryos and analyze developmental time.

The demand for kidney transplants is far from met by human donors — a problem that may be solved by the clinical translation of porcine kidney xenotransplantation. A new paper describes the development of genetically ‘humanized’ pigs, the kidneys of which kept nephrectomized cynomolgus macaques alive for up to 2 years.

Allometric tissue-scale stresses at an implant’s surface trigger pathological foreign-body responses, mediated by the activation of mechanoresponsive myeloid cells, that increase exponentially with body size.

Grid cells develop in rats soon after they leave the nest. Here, Ulsaker-Janke et al. show that preventing exposure to straight boundaries from birth delays, but does not prevent, grid cell maturation in adult rats.

How to reduce animal numbers and increase the information content of animal-based studies. A ‘well-built’ research question turns the research hypothesis into an actionable, focused, and testable plan of action.