Evolutionary Biology

Evolutionary Adaptations of IRG1 Refines Itaconate Synthesis and Mitigates Innate Immunometabolism Trade-offs

1. Richard V Szeligowski
2. Francois Miros
3. Andres Saez
4. Marisa DeCiucis
5. Gunter P Wagner
6. Hongying Shen

• Curated by eLife

  eLife Assessment

  This important study addresses the timely and interesting question of how itaconate generation emerged in evolution, using taxonomic analysis of the gene and enzyme cis-aconitate decarboxylase (CAD). The authors provide solid evidence identifying three CAD branches in metazoans and showing that the early metazoan paleo-form indeed generates aconitate and is already linked to innate immunity. They further provide limited evidence suggesting that taxonomic differences in subcellular localisation of this enzyme may allow for innate immune signalling without compromising cellular energetics. The implications of the study will be of high interest to the field of innate host defence and immunometabolism.

Reviewed by eLife

Convergent iridescence and divergent chemical signals in sympatric sister-species of Amazonian butterflies

1. Joséphine Ledamoisel
2. Bruno Buatois
3. Rémi Mauxion
4. Christine Andraud
5. Melanie McClure
6. Vincent Debat
7. Violaine Llaurens

• Curated by eLife

  eLife Assessment

  This study presents a valuable assessment of and solid evidence for increased similarity in visual appearance combined with increased chemical differences between two butterfly species in sympatry compared with differences between three populations of one of the two species in allopatry. The similarity in visual appearance hints to an evolutionary response to shared predators (but alternative explanations are possible). Thus, the difference in chemical signaling likely helps to avoid between-species mating in sympatry.

Reviewed by eLife

Importance of higher-order epistasis in protein sequence-function relationships

1. Palash Sethi
2. Juannan Zhou

• Curated by eLife

  eLife Assessment

  In this important work, the authors present a new transformer-based neural network designed to isolate and quantify higher-order epistasis in protein sequences. They provide solid evidence that higher-order epistasis can play key roles in protein function. This work will be of interest to the communities interested in modeling biological sequence data and understanding mutational effects.

Reviewed by eLife

Heterozygote advantage cannot explain MHC diversity, but MHC diversity can explain heterozygote advantage

1. Joshua L Cherry

• Curated by eLife

  eLife Assessment

  The is a valuable evaluation of a previously published simulation model on the role of heterozygote advantage in shaping MHC diversity, showing that the conclusions from this model hold only within a narrow parameter range that might be unrealistic. The author presents an alternative model, in which MHC homozygotes with duplicated MHC genes outperform heterozygotes with single genes, thereby challenging the explanation that heterozygote advantage will lead to high allelic variation at a given MHC gene. The topic is highly relevant for eco-immunology and evolutionary genetics, but several major aspects of the author's claim need to be clarified to make the model interpretable. While the work has the potential to improve our understanding of the question of how the extraordinary diversity at the MHC locus evolves, without this addition, the conclusions remain incomplete.

Reviewed by eLife

Parallel HIV-1 fitness landscapes shape viral dynamics in humans and macaques that develop broadly neutralizing antibodies

1. Kai S Shimagaki
2. Rebecca M Lynch
3. John P Barton

• Curated by eLife

  eLife Assessment

  In this important quantitative study of HIV-1 evolution in humans and rhesus macaques, selection coefficients are inferred at scale over the HIV genome. Selection coefficients are similar in humans and macaques, providing compelling evidence that these coefficients are representative of the fitness landscapes of these viruses within hosts. This work will be of interest to the community working on quantitative evolution and fitness landscape inference, and the finding that rapid fitness gains in the HIV population predict bNAb emergence has significant implications for HIV vaccine design.

Reviewed by eLife

G-protein-coupled receptor diversity and evolution in the closest living relatives of metazoa

1. Alain Garcia De Las Bayonas
2. Nicole King

• Curated by eLife

  eLife Assessment

  This important study fills a gap in our knowledge of the evolution of GPCRs in holozoans, as well as the phylogeny of associated signaling pathway components such as G proteins, GRKs, and RIC8 proteins. The evidence supporting the conclusions is compelling, with the analysis of extensive new genomic data from choanoflagellates and other non-animal holozoans. Overall, the study is thorough and well-executed. It will be a resource for researchers interested in both the comparative genomics of multicellularity and GPCR biology more broadly, especially given the importance of GPCRs as highly druggable targets

Reviewed by eLife

The holocephalan ratfish endoskeleton shares trabecular and areolar mineralization patterns, but not tesserae, with elasmobranchs little skate and catshark

1. Oghenevwogaga Joseph Atake
2. Fidji Berio
3. Melanie Debiais Thibaud
4. B Frank Eames

• Curated by eLife

  eLife Assessment

  This important study significantly advances our understanding of the skeleton of cartilaginous fishes by using a range of state of the art and complementary approaches to compare the skeleton amongst three cartilagenous fishes (catshark, little skate and ratfish). The evidence presented is compelling and likely to impact several fields of study.

Reviewed by eLife

Alternative splicing across the tree of life

1. Rebeca de la Fuente
2. Wladimiro Dı́az-Villanueva
3. Vicente Arnau
4. Andres Moya

• Curated by eLife

  eLife Assessment

  The authors examined the frequency of alternative splicing across prokaryotes and eukaryotes and found that the rate of alternative splicing varies with taxonomic groups and genome coding content. This solid work, based on nearly 1,500 high-quality genome assemblies, relies on a novel genome-scale metric that enables cross-species comparisons and that quantifies the extent to which coding sequences generate multiple mRNA transcripts via alternative splicing. This timely study provides an important basis for improving our general understanding of genome architecture and the evolution of life forms.

Reviewed by eLife, Arcadia Science

Host and antibiotic jointly select for greater virulence in Staphylococcus aureus

1. Michelle Su
2. Kim L Hoang
3. McKenna Penley
4. Michelle H Davis
5. Jennifer D Gresham
6. Levi T Morran
7. Timothy D Read

• Curated by eLife

  eLife Assessment

  This important study examines the evolution of virulence and antibiotic resistance in Staphylococcus aureus under multiple selection pressures. The evidence presented is convincing, with rigorous data that characterizes the outcomes of the evolution experiments. However, the manuscript's primary weakness is in its presentation, as claims about the causal relationship between genotypes and phenotypes are based on correlational evidence. The manuscript needs to be revised to address these limitations, clarify the implications of the experimental design, and adjust the overall narrative to better reflect the nature of the findings.

Reviewed by eLife

Determinants of mutation load in birds

1. Fidel Botero-Castro
2. Jochen B. W. Wolf

Reviewed by Arcadia Science