Hybridization and introgression blur species boundaries and broaden genetic diversity available for adaptation; and widespread introgression underpins the evolution of races of the generalist pathogen Albugo candida that specialise on different host plant species.

Incompatibilities between the viral replication machinery and orthologs of the essential host factor cyclophilin A (CypA) contribute to the narrow host range of hepatitis C virus.

The success of angiotensin-converting enzyme 2 (ACE2)-based predictions of severe acute respiratory syndrome-associated virus 2 (SARS-CoV-2) host range stems from phylogenetic correlation, allowing development of scalable models which predict susceptibility to SARS-CoV-2 and other sarbecoviruses without requiring additional ACE2 sequencing.

Bacteriophage can rapidly evolve resistance to anti-phage defense elements in bacteria by amplifying latent counter-defense genes, though this amplification comes at a cost of compensatory deletions that eliminate other counter-defense genes.

Codon optimization through biased synonymous substitutions is a characteristic feature of the genomes of generalist fungal parasites and is associated with the colonization of multiple hosts.

Phylogenetic analyses demonstrate an evolutionary trade-off between the amount of harm inflicted by a broad host-range virus and how effectively the virus positions itself within plants to enable onward transmission.

NPC1 is a genetic determinant of filovirus susceptibility in bats, and some variations in bat NPC1 may reflect host adaptations to reduce filovirus replication and virulence.

Naive CD4 and CD8 T cells in mice increase their survival capacity with age, but their numbers are not homeostatically regulated.

The sense of smell of female hawkmoths has evolved to find the intense odor of floral nectar sources as well as inconspicuous scents of oviposition sites within a complex olfactory landscape.

The range of molecular forms adopted by L1 retrotransposons reflect a tapestry of lifecycle-permissive and -restrictive host-parasite interactions occurring within cells.