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A recent paper found that the sex chromosomes of the crested ibis have more gametolog pairs than many other birds. This Comment discusses that this finding suggets that WZ recombination stopped independently in the sex chromosomes in different bird lineages.

History lesson.

An analysis of 24,202 critical cases of COVID-19 identifies potentially druggable targets in inflammatory signalling (JAK1), monocyte–macrophage activation and endothelial permeability (PDE4A), immunometabolism (SLC2A5 and AK5), and host factors required for viral entry and replication (TMPRSS2 and RAB2A).

In an updated report on 70 laboratory-confirmed highly pathogenic avian influenza A H5N1 cases in the USA between March 2024 and May 2025, the absence of human-to-human transmission to date was confirmed, with no known mutations of resistance to neuroaminidase inhibitors.

Animal behavioural response to predation risk could depend on the type and number of cues. This global metaanalysis shows that providing multiple cues of predation risk reduces variance in the behavioural responses of birds.

A global network of researchers was formed to investigate the role of human genetics in SARS-CoV-2 infection and COVID-19 severity; this paper reports 13 genome-wide significant loci and potentially actionable mechanisms in response to infection.

Whole-genome sequencing, transcriptome-wide association and fine-mapping analyses in over 7,000 individuals with critical COVID-19 are used to identify 16 independent variants that are associated with severe illness in COVID-19.

Hagfish slime contains fibres that are produced in gland cells, but how these threads are assembled within the cell is unclear. Here, using electron microscopy and three-dimensional modelling, the authors show that during gland cell maturation the shape of the nucleus changes, permitting the coiling of the threads around it.

Using high-throughput genome and transcriptome sequencing, Y chromosome evolution across 15 representative mammals is explored, with results providing evidence for three independent sex chromosome originations in mammals and birds.

The authors test whether spatial scale (plot, local and landscape) affects the supply of various ecosystem services in grasslands, finding that some services are predicted by plot-level properties while others depend more on landscape-level management.

Understanding how particular natural systems operate without central control will reveal whether such systems share general properties.

Dioecy has evolved independently from hermaphroditic ancestors in different plant lineages. Here, the authors assemble Populus deltoides male and female genomes, and show the putative roles of a femaleness gene and a maleness gene in sex determination, which suggests independent evolution in different poplar species.

Large genome-wide meta-analysis of clinically diagnosed late-onset Alzheimer’s disease (LOAD) from 94,437 individuals identifies new LOAD risk loci and implicates Aβ formation, tau protein binding, immune response and lipid metabolism.

Experts applaud revised plan

Randomised controlled experiments are the gold standard for scientific inference, but environmental and social scientists often rely on different study designs. Here the authors analyse the use of six common study designs in the fields of biodiversity conservation and social intervention, and quantify the biases in their estimates.

Although increased patenting has accompanied the development of antivirals as in vivo therapeutics, ongoing US litigation reflects concerns regarding their patentability.

Meta-analysis of genome-wide association studies on Alzheimer’s disease and related dementias identifies new loci and enables generation of a new genetic risk score associated with the risk of future Alzheimer’s disease and dementia.

Genome-wide analyses identify common variants associated with 11 distinct neuropathology endophenotypes, providing insights into the mechanisms underlying the genetic risk of Alzheimer’s disease and related dementias.

Crassulacean acid metabolism (CAM) is a metabolic adaptation of photosynthesis that enhances water use efficiency. Here, via genomic analysis of Kalanchoë, the authors provide evidence for convergent evolution of protein sequence and temporal gene expression underpinning the multiple independent emergences of CAM.

A study of the evolution of the SARS-CoV-2 virus in England between September 2020 and June 2021 finds that interventions capable of containing previous variants were insufficient to stop the more transmissible Alpha and Delta variants.

APOE is the major genetic risk factor for Alzheimer’s disease. In a large number of neuropathologically confirmed cases and controls, the impact of different APOE genotypes on Alzheimer’s dementia risk was greater than previously thought and APOE2 homozygotes had an exceptionally low risk.

Chronic infection with SARS-CoV-2 leads to the emergence of viral variants that show reduced susceptibility to neutralizing antibodies in an immunosuppressed individual treated with convalescent plasma.

Sera from vaccinated individuals and some monoclonal antibodies show a modest reduction in neutralizing activity against the B.1.1.7 variant of SARS-CoV-2; but the E484K substitution leads to a considerable loss of neutralizing activity.

A high-quality sequence assembly of the zebrafish genome reveals the largest gene set of any vertebrate and provides information on key genomic features, and comparison to the human reference genome shows that approximately 70% of human protein-coding genes have at least one clear zebrafish orthologue.

The Omicron variant evades vaccine-induced neutralization but also fails to form syncytia, shows reduced replication in human lung cells and preferentially uses a TMPRSS2-independent cell entry pathway, which may contribute to enhanced replication in cells of the upper airway. Altered fusion and cell entry characteristics are linked to distinct regions of the Omicron spike protein.

Sven van der Lee, Julie Williams, Gerard Schellenberg and colleagues identify rare coding variants in PLCG2, ABI3 and TREM2 associated with Alzheimer's disease. These genes are highly expressed in microglia and provide additional evidence that the microglia-mediated immune response contributes to the development of Alzheimer's disease.

Gerard Schellenberg and colleagues report a genome-wide association study of late-onset Alzheimer's disease (LOAD), as part of the Alzheimer Disease Genetics Consortium. They identify common variants in MS4A4/MS4A6E, CD2AP, CD33 and EPHA1 associated with LOAD.

Research into the immune mechanisms associated with healthy tolerance to common foods, the inflammatory response underlying food allergies, and immunotherapy-induced desensitization promises new approaches to the diagnosis, prevention and treatment of food allergy.

An analysis of above-ground biomass recovery during secondary succession in forest sites and plots, covering the major environmental gradients in the Neotropics.