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PubMed2026

Interkingdom remodeling of the intestinal bacteriome and virome during Toxoplasma gondii infection in rats.

Toxoplasma gondii infection is associated with intestinal microbiome disruption, but its effects on genome-resolved bacterial populations, the gut virome, and bacteriome-virome relationships remain poorly understood. Using previously generated shotgun metagenomic datasets from 36 intestinal samples collected from 18 Sprague-Dawley rats across control, acute, and chronic infection groups, we reconstructed 294 quality-filtered, non-redundant bacterial metagenome-assembled genomes (MAGs) and identified 899 medium-to-high-quality viral operational taxonomic units (vOTUs) from assembled metagenomic contigs. Infection was associated with reduced bacterial richness in the small intestine during both acute and chronic stages and lower Shannon diversity during chronic infection. In contrast, large-intestinal α-diversity remained stable despite significant compositional reorganization. Taxonomic changes included increased Lactobacillus intestinalis, Limosilactobacillus reuteri, and Prevotella sp900547005, together with decreased Rothia sp002492045 and Akkermansia muciniphila. Functional profiling revealed region- and stage-specific changes in predicted bacterial metabolic potential, including reduced energy-related pathways and carbohydrate-active enzyme abundance. The virome also showed significant compositional changes in both intestinal regions. Quimbyviridae and Podoviridae_crAss-like viruses decreased in the small intestine during chronic infection, while Quimbyviridae, Flandersviridae, and Podoviridae_crAss-like viruses showed stage-specific decreases in the large intestine. Predicted bacterial hosts were assigned to 48.39% of vOTUs, with Lachnospiraceae and Ruminococcaceae being the most frequently linked families. Trans-kingdom networks further revealed region-specific positive and negative abundance correlations between bacterial and viral taxa. These findings extend previous microbiota-metabolome observations by integrating genome-resolved bacteriome analysis with contig-based virome profiling, providing a foundation for future mechanistic studies of toxoplasmosis-associated microbiome remodeling.

Gut virome↗
PubMed2026

A stem-like chromatin program in small-cell lung cancer is associated with poor outcomes after chemoimmunotherapy.

Small-cell lung cancer (SCLC) is an aggressive malignancy with substantial tumor heterogeneity and limited clinically actionable biomarkers beyond established features such as liver metastases. We profile tumor-intrinsic chromatin accessibility in a patient-derived xenograft biobank and identify three recurrent chromatin programs: neuroendocrine, marked by ASCL1/NEUROD1 activity; immunogenic, marked by IRF-associated activity; and stem-like, marked by TEAD/OCT activity. These programs are reproduced at the cohort level across bulk and single-cell transcriptomic datasets comprising more than 800 tumors, including 300 extensive-stage samples. In patients treated with chemoimmunotherapy, the stem-like program is associated with inferior survival, including a median overall survival of 7.41 months versus 15.9 and 12.6 months for immunogenic and neuroendocrine groups, respectively. This association remains significant after adjustment for liver metastases, brain metastases, and elevated lactate dehydrogenase. These findings support a high-risk stem-like SCLC chromatin program for prospective biomarker refinement and therapeutic investigation.

ATAC-seq↗
PubMed2026

Trio-based GWAS reveals loci associated with different forms of isolated cleft lip.

Orofacial clefts (OFCs) are the most common craniofacial birth defect and comprise a diverse group of traits with complex and heterogeneous etiologies. Genetic studies of OFCs typically approach this diversity by stratifying cases into broad diagnostic classes, including cleft lip (CL), cleft palate (CP), and cleft lip with palate (CLP). Although this strategy has yielded important insights into OFC risk, it ignores the phenotypic heterogeneity within each subtype. CL exhibits marked phenotypic variability, involving differences in alveolar involvement, laterality, and sidedness that may reflect distinct etiologies. Given this phenotypic diversity within CL, we assembled a multi-ancestry cohort of 837 nonsyndromic CL case-parent trios with whole-genome sequencing and detailed phenotyping. We performed genome-wide association scans (GWAS) via transmission disequilibrium tests for CL overall and for 14 CL subtypes defined by involvement of the alveolus (with and without), laterality (uni- and bilateral), and sidedness (left and right). We identified four genome-wide significant loci. Two loci, IRF6 and 8q24.21, were both detected in the overall CL GWAS. PLCB1/PLCB4 and MAFB were detected in GWASs of alveolar cleft involvement and CL left sidedness, respectively. These subtype-specific associations were followed by case-only comparisons that reflect the presence or absence of alveolus cleft or left-sided bias of CL to confirm the specificity of the association signal to the particular subtype. Our results provide evidence of within-class CL subtype-specific genetic links for loci previously discussed in the context of primary OFC classes and demonstrate the value of granular OFC subtype characterization to capture trait-specific associations.

Alveolus Cleft↗
PubMed2026

De novo Genes in Plants: Origins, Mechanisms, and Functional Implications.

De novo genes originate from previously non-coding genomic regions. They provide an important source of lineage-specific innovation. In plants, these genes may contribute to adaptation, trait diversity and crop evolution. This review summarizes recent progress in plant de novo gene research. It first discusses major routes of gene birth, including transcription-first, open reading frame (ORF)-first and concurrent models. It also examines how nascent loci acquire regulatory control and enter existing biological networks. The review then summarizes their evolutionary features, including weak early constraint, rapid molecular change, restricted expression and structural refinement. It further discusses plant de novo genes involved in stress responses, seed germination, kernel dehydration, subspecies divergence, reproductive isolation and floral scent diversification. Current methods for identifying de novo genes remain limited by rapid sequence evolution, genome annotation quality, polyploidy and transposable elements. Whole-genome synteny alignment, multi-omics evidence and machine-learning approaches can improve candidate discovery. However, each method has important limitations. Finally, this review highlights key future questions in functional validation, latent coding potential in long non-coding RNAs, epigenetic activation, regulatory-network integration and crop improvement. These perspectives clarify how de novo genes shape plant adaptation and how they may be used in precision breeding and synthetic biology.

adaptive evolution↗
PubMed2026

Unraveling cadaverine toxicity effect to guide the engineering of robust strain.

End-product inhibition represents a major challenge in the microbial synthesis of various value-added chemicals. Cadaverine, a key monomer for polyamide synthesis, exhibits severe cytotoxicity, limiting its high-titer biosynthesis. Here, transcriptomic analysis and genome-wide library screening were integrated to systematically elucidate the cytotoxic mechanisms of cadaverine in Escherichia coli (E. coli) and identify beneficial genes for enhanced tolerance and overproduction. Transcriptomic analysis revealed that high concentrations of cadaverine disrupted cell membrane integrity and impaired oxidative phosphorylation, leading to redox imbalance and reactive oxygen species (ROS) accumulation. Subsequent genome-wide screening further confirmed these toxicity mechanisms and uncovered crucial cellular defense strategies. Functional validation highlighted the important role of NikR, UbiE, and YcbX in enhancing membrane integrity, restoring respiratory function and ROS homeostasis, or scavenging 6-N-hydroxylaminopurine (6-HAP) to prevent DNA damage. Among these, YcbX emerged as the most effective target for improving production. Consequently, we constructed a robust E. coli strain by implementing a dynamic regulation system for YcbX expression under cadaverine-responsive promoters, which significantly enhanced cadaverine biosynthesis to 87.2 g/L (a 46.8% enhancement). This work provides an in-depth understanding of cadaverine toxicity and tolerance, offering valuable targets and strategies for the rational design of high-performance microbial cell factories for diamines.

6-HAP clearance↗
PubMed2026

Recurrent hybridization shapes the diversification of Western Palearctic common toads (Bufo bufo complex).

Glacial cycles repeatedly fragmented temperate species into refugial populations, fostering divergence as a first stage towards speciation. Yet, interglacial expansions often reconnected these lineages, allowing gene flow to erode differentiation and reshape phylogeographic trajectories. We investigate these dynamics in Western Palearctic common toads (Bufo bufo complex), integrating genome-wide ddRAD-seq loci with an extensive mitochondrial dataset. Phylogenomic analyses resolved the three recognized species B. eichwaldi, B. spinosus and B. bufo, and within the latter, four major lineages distributed across the Apennine Peninsula, the Balkans, the Caucasus, and northern Europe. Mitochondrial and nuclear patterns were deeply discordant, and different approaches of historical gene flow inferences all supported past hybridization. In particular, our analyses suggest that the Caucasian population, previously attributed to the disputed species "B. verrucosissimus" based on its deeply divergent mtDNA, represents a shallow nuclear lineage within B. bufo and forms a broad intergradation zone with the Balkan lineage in Anatolia, arguing against a species status. Altogether, these results highlight a recurrent process in which refugial lineages do not diverge in strict isolation but repeatedly experience gene flow, thus reducing opportunities to speciate, and blurring tree-based phylogeographic and systematic hypotheses.

Amphibia↗
PubMed2026

Genome-wide SNP data reveal geographic structure and landscape-associated genomic differentiation in a widespread lizard in arid Eastern Central Asia.

Arid landscapes provide important systems for examining how geographic structure and environmental heterogeneity shape genomic differentiation. In topographically complex desert regions, however, it remains challenging to determine whether population structure primarily reflects landscape resistance, geographic distance, or contemporary environmental variation. Here, we use genome-wide SNP data to investigate population structure, phylogenetic relationships, historical gene flow, demographic history, and landscape correlates of genomic differentiation in the variegated racerunner (Eremias vermiculata), a widespread lacertid lizard across arid Eastern Central Asia. Analyses of 164 individuals recovered six geographically structured nuclear clusters associated with major desert basins and mountain-bounded regions. Nuclear phylogenies resolved two broad regional clades corresponding to northeastern and southwestern parts of the species' range, while PCA and ADMIXTURE analyses recovered six finer-scale genetic clusters. Mitochondrial phylogenies, based on combined NCBI-derived Cyt b and COI sequences from the same individuals, recovered four deeper maternal lineages. These patterns indicate overall phylogeographic agreement between nuclear and mitochondrial datasets, with genome-wide SNPs providing finer-scale resolution of population structure. Demographic reconstructions further uncovered regionally heterogeneous Late Pleistocene histories among clusters, including signals of expansion, stability, and decline. Landscape genomic analyses revealed that genomic differentiation is primarily associated with landscape resistance, particularly elevation and land cover, as well as geographic distance, whereas contemporary environmental variables explained comparatively little variation after controlling for spatial structure. Together, our results suggest that genomic differentiation in E. vermiculata reflects the interplay of persistent landscape configuration, historical connectivity, and region-specific demographic histories across arid Eastern Central Asia. More broadly, this study highlights the value of integrating phylogeographic and landscape genomic approaches for understanding population differentiation and evolutionary history in topographically heterogeneous desert ecosystems.

Arid Eastern Central Asia↗
PubMed2026

Multiplexed genome editing by CRISPR-Un1Cas12f1 restores dystrophin expression in a mouse model of Duchenne muscular dystrophy.

The compact type V clustered regularly interspaced short palindromic repeats (CRISPR) nuclease Un1Cas12f1 is compatible with adeno-associated virus (AAV)-mediated genome editing, although the protospacer adjacent motif (PAM) requirements and capacity for multiplexed genome editing remain undefined. Here, we show that Un1Cas12f1 exhibits a broad tolerance for non-canonical PAMs, including Y-rich motifs with a preference for TTCR and TCTA PAMs, thereby expanding the genomic targeting range. We further demonstrate that a tandem sgRNA array expressed from a single transcript supports Un1Cas12f1-mediated multiplexed genome editing at up to five distinct genomic loci. Leveraging this multiplexing capability, we achieved targeted excision of the Dmd exon 23 through intramuscular delivery of an all-in-one AAV vector encoding Un1Cas12f1 and a CRISPR array. This treatment restored the disrupted open reading frame and dystrophin expression in a mouse model of Duchenne muscular dystrophy (DMD). Together, these findings establish Un1Cas12f1 as a compact CRISPR system capable of multiplexed genome editing and demonstrate its therapeutic potential for DMD.

Journal Article↗
PubMed2026

Long-term outcomes of top-down therapy versus a conventional step-up strategy in adults newly diagnosed with Crohn's disease: 5-year follow-up of the PROFILE trial.

BACKGROUND: The PROFILE trial previously reported better 48-week outcomes for patients with Crohn's disease who received top-down anti-TNF treatment from diagnosis, compared with a conventional step-up strategy. Through subsequent follow-up of PROFILE participants, we aimed to assess whether the benefit of top-down treatment from diagnosis results in modification of the long-term disease course. METHODS: PROFILE was a multicentre, open-label, randomised controlled trial completed in 40 hospitals in the UK, which included patients aged 16-80 years with newly diagnosed Crohn's disease. Eligible patients were randomly assigned via a secure online platform to a top-down (infliximab plus immunomodulator) or a step-up protocolised treatment strategy for 48 weeks, after which participants reverted to local standards of care. Objective outcome data were extracted for up to 5 years after the week 48 visit, including need for Crohn's-related abdominal surgery as the primary outcome. Data were analysed based on the original PROFILE randomisation and intention-to-treat population. Participants without long-term follow-up data were censored at the week 48 visit. Time-to-event analyses were performed using the Kaplan-Meier method and Cox proportional hazards model. The trial was registered with the ISRCTN registry, number 11808228 and is complete. FINDINGS: Between Dec 29, 2017, and Jan 5, 2022, 483 patients were assessed for inclusion. 389 patients were enrolled and randomly assigned (three patients were excluded due to ineligibility), 193 to top-down treatment and 193 to step-up treatment. Of the 386 participants in the PROFILE primary trial, 358 (93%) had post-week 48 records available for review (182 [51%] top-down and 176 [49%] step-up). Median follow-up was approximately 5 years from randomisation (1809 days [IQR 1300-2101]), by which point 172 (89%) of 193 patients in the step-up group and 191 (99%) of 193 patients in the top-down group had received biological or immunomodulator therapy. Relating to the primary outcome, during follow-up there were 28 Crohn's disease-related abdominal surgeries in 26 patients treated with a step-up approach versus six surgeries in six patients treated with a top-down approach. Time to surgery was shorter in the step-up group than the top-down group (adjusted hazard ratio [aHR] 5·23 [95% CI 1·99-13·76]; p=0·0008). For the secondary outcomes, incidence of Crohn's disease-related hospital admissions was higher in patients originally managed with step-up treatment versus top-down treatment (41 [21%] of 193 patients vs 22 [11%] of 193 patients); and time to first hospital admission was shorter with step-up treatment than with top-down treatment (aHR 2·01 [95% CI 1·18-3·41], p=0·017). Progression to B2 or B3 complications was also more frequent in those originally managed with step-up treatment compared with top-down treatment (32 [17%] of 192 patients vs 13 [7%] of 193 patients); with time to disease progression being shorter in the step-up group than in the top-down group (aHR 2·46 [95% CI 1·25-4·86]; p=0·010). There was no difference in safety outcomes between groups for either serious infections (12 [6%] of 193 step-up patients and 14 [7%] of 193 top-down patients) or malignancies (five patients [3%] and three patients [2%] respectively). INTERPRETATION: Early top-down anti-TNF treatment from diagnosis was associated with improved long-term outcomes at 5 years compared with step-up treatment and is suggestive of a disease-modifying effect in Crohn's disease. FUNDING: Wellcome and Celltrion.

Journal Article↗
PubMed2026

Molecular characterization of vitellogenin and its receptor with CRISPR-based sgRNA validation in the legume pod borer, Maruca vitrata (Geyer) (Lepidoptera: Crambidae).

Maruca vitrata, the legume pod borer, causes yield losses of up to 80% in grain legumes. Increasing insecticide resistance and environmental concerns necessitate sustainable pest management alternatives. In the present study, the complete vitellogenin (Vg) coding sequence (CDS), a key reproductive gene involved in oogenesis and embryonic development, was cloned and molecularly characterised from M. vitrata. The assembled Vg CDS (∼5.3 kb) shared 99.04% sequence identity with the reported M. vitrata Vg sequence (MG799570.1). Phylogenetic analysis demonstrated close evolutionary association with related Lepidopteran species, while protein domain analysis identified three conserved domains, namely LPD_N, DUF1943, and VWD. Among these, the single exon-encoded LPD_N domain was selected as the target region for CRISPR/Cas9-mediated editing. Homology models of Vg and vitellogenin receptor (VgR) (Global Model Quality Estimation (GMQE): 0.58 and 0.51) showed a favourable interaction by protein-protein docking (score: -295.66). Three single-guide RNAs (sgRNAs) were designed, synthesised through in-vitro transcription, and evaluated using in vitro cleavage assays. sgRNA1 targeting the LPD_N domain and sgRNA2 targeting the signal peptide region exhibited efficient site-specific cleavage activity, whereas sgRNA3 failed to induce cleavage because of an unfavourable secondary structure that likely impaired Cas9-sgRNA complex formation. Overall, this study provides the first CRISPR-oriented functional characterisation and sgRNA validation of the M. vitrata Vg gene, together with structural characterisation of VgR and Vg-VgR interaction analysis, providing preliminary molecular resources for future CRISPR/Cas9 studies and supporting future embryo microinjection and heritable genome editing for sustainable management of M. vitrata.

CRISPR/Cas9↗
PubMed2026

Selective Macrocyclic WEE1 Kinase Inhibitors with Strong Efficacy against Patient-Derived Colorectal Cancer Organoids.

Macrocyclization can enhance the selectivity of acyclic compounds toward structurally similar biological targets such as kinases. WEE1 regulates cellular homeostasis and is a promising target in oncology. The clinical candidate AZD1775 (1) failed to progress past Phase II trials because of patient tolerability issues, likely due to off-target inhibition of polo-like kinase 1 (PLK1). Herein, a computer-aided drug design approach was conducted to develop a macrocycle based on the 1-WEE1 X-ray cocrystal structure. Significantly enhanced WEE1 inhibitory selectivity over PLK1 was determined for leading macrocycle 2, which also demonstrated broader kinome-wide selectivity. Patient-derived organoids from colorectal cancer (CRC) peritoneal and liver metastases, treated with 2, demonstrated comparably strong or enhanced anticancer efficacy compared to that of 1. Against patient-matched normal colon vs primary CRC organoids, 2 potently and selectively treated CRC, as well as enhanced DNA damage compared to 1. Finally, the X-ray cocrystal structure of 2 bound to WEE1 validated its computationally predicted bioactive binding mode.

Humans↗
PubMed2026

Structure-Function Analysis of the Benzyloxy Moiety of the Delta-Opioid Receptor Positive Modulator BMS-986187: Identification of a Derivative with High Selectivity for the Delta-Opioid Receptor over the Mu-Opioid Receptor In Vitro and In Vivo.

Positive allosteric modulators (PAMs) of the delta-opioid receptor (DOR) enhance endogenous opioid signaling while avoiding the convulsant liability of orthosteric agonists. However, the prototypical DOR-PAM, BMS-986187, also potentiates mu-opioid receptor (MOR) signaling, raising concerns regarding respiratory depression and abuse liability. Here, we report a structure-activity study of the benzyloxy moiety of BMS-986187 to improve selectivity for DOR over MOR, while retaining DOR-PAM potency. Fifty-two new analogues and 12 previously reported ones featuring mono- and disubstitution of the benzyl ring and phenyl-heterocycle replacements were synthesized and evaluated in β-arrestin2 recruitment assays. Ortho-substituted derivatives consistently enhanced DOR-PAM potency, although often increased MOR-PAM activity. One pyridyl derivative (compound 35) retained high DOR-PAM potency and efficacy (EC50 = 0.1 μM, Emax = 91%) with no detectable MOR activity. In mice, compound 35 enhanced DOR-mediated reversal of nitroglycerin-induced hyperalgesia, an effect absent in DOR-knockout mice, without enhancing MOR-mediated antinociception, demonstrating in vivo selectivity.

Receptors, Opioid, delta↗
PubMed2026

Macrocyclization of Broad-Spectrum Kinase Inhibitor Bosutinib Leads to Potent and Selective Quinoline-Based HIPK4 Inhibitor AZ137.

Homeodomain-interacting protein kinase 4 (HIPK4) remains an understudied member of the dark kinome. While genetic knockout studies suggest its involvement in spermiogenesis and cutaneous squamous cell carcinoma, whether these cellular functions can be recapitulated by pharmacological inhibition remains to be determined. These investigations are currently hampered by a lack of high-quality chemical tools. To address this, we employed a rational design strategy utilizing macrocyclization of a bosutinib-based scaffold. Systematic optimization led to the discovery of AZ137 (28e), a potent and selective HIPK4 inhibitor (IC50: 11 nM; cellular EC50: 76 nM). AZ137 exhibits exceptional selectivity across three comprehensive orthogonal panels, high solubility, and no detectable cytotoxicity. Its cellular activity was confirmed in cell-based assays of HIPK4-dependent F-actin remodeling. Together with a negative control compound, this probe set provides a foundational framework for validating HIPK4 as a therapeutic target and a high-quality resource to elucidate its roles in normal physiology and disease.

Quinolines↗
PubMed2026

Linking visceral fat accumulation to gut microbiota: key bacterial taxa and their roles in the glycogen synthesis pathway.

Obesity, marked by visceral fat accumulation, has a complex relationship with the gut microbiome that impacts body weight and fat accumulation. However, previous studies did not account for fat distribution, reflecting only overall fat mass, leaving specifics of this relationship partially understood. Here we analyzed the mechanistic links between visceral fat and the microbiome in a large cohort of healthy Koreans. Using permutational multivariate analysis of variance and prediction modeling, we examined associations between microbial profiles and metabolic variables including insulin, triglycerides, waist circumference and visceral fat. The strongest correlations were noted with specific enterotypes. Shotgun sequencing revealed that visceral fat is linked to the glycogen synthesis pathway influenced by Dorea longicatena and Bifidobacterium adolescentis. This suggests that these specific microbial signatures and their associated functional potential play a role in visceral fat-related obesity. To validate these findings, we conducted an in vivo study using diet-induced obesity mouse model. Oral administration of D. longicatena or B. adolescentis significantly promoted body weight gain and fat mass expansion and induced hepatic lipogenic gene upregulation. The prevalence of these strains in Korean and American populations highlights their global relevance, contributing to the development of personalized treatments and advanced health strategies.

Journal Article↗
PubMed2026

Clinical translation of senescence-related pan-cancer multi-omics: tools for assessment and immunotherapy prediction.

Cellular senescence (CS) exerts dual roles in tumorigenesis, yet its pan-cancer molecular characteristics and clinical value remain unclear, hindering its translation to oncology and personalized therapy. To address the lack of specific and universal tools for senescence assessment and immunotherapy response prediction, this study systematically analyzed 1259 CS-related genes from the CellAge database across 31 cancer types by integrating multi-omics data, including bulk RNA-seq, single-cell/spatial transcriptomics, and CRISPR screening. We developed a rank-based algorithm SenScoreR (publicly available at https://gxhub.shinyapps.io/SenScoreR/ ) for senescence quantification, validated with 10 independent datasets, and constructed a machine learning-based predictive model CS.Sig for immunotherapy response. Results showed that tumors had significantly lower Rank-based Senescence Score (RSS) than normal tissues across 31 cancers (average diagnostic AUC = 0.895), with low RSS linked to poor survival; high RSS correlated with reduced genomic instability, enriched CD8⁺ T/NK cell/macrophage infiltration, upregulated PD-L1 expression, and elevated immune cytolytic activity. CS.Sig demonstrated robust performance in predicting ICI response (AUC = 0.716 across 10 cohorts), outperforming 13 existing signatures, while CRISPR screening identified 17 senescence-related targets (e.g., CEP55, PPP1CC) whose knockout enhanced anti-tumor immunity. Our findings clarify CS's role in maintaining tumor genomic stability and shaping immune microenvironments, and the developed SenScoreR, CS.Sig, and identified targets bridge basic CS research with clinical oncology, providing a translational resource and hypothesis basis for future experimental and clinical validation.

Journal Article↗
PubMed2026

Decoding the landscape of cell-type-specific co-expressed transcription factors in soybean.

Soybean (Glycine max) is an essential source of protein and oil with high nutritional value for human and animal consumption. To enhance our understanding of soybean biology, it is essential to have accurate information regarding the expression of each of its protein-coding genes. Here, we present Tabula Glycine max, a soybean single-cell resolution transcriptome atlas. This atlas comprises single-nucleus RNA-sequencing data from ten different G. max organs and morphological structures constituting the entire soybean plant. These nuclei are grouped into 156 different clusters based on their transcriptomic profiles. The breadth of various organs, tissues and cell types represented in Tabula Glycine max reveals that the pattern of co-expressed transcription factor genes is sufficient to define most cell types based on their function and organ of origin. Defining cell-type-specific co-expressed transcription factor genes offers a new perspective to engineer cell-type-specific programmes and enhance the biology of unique soybean cell types. This cellular resolution and breadth make the Tabula Glycine max an exceptional resource for the plant and soybean communities.

Journal Article↗
PubMed2026

Zebrafish relatives as models for functional comparative genetics and genomics.

Closely related species, such as danionin fishes of the Danio, Danionella and Devario genera, often differ in their biology despite their shared evolutionary history, providing a platform for defining the molecular basis for the divergence of phenotypic traits. Such an approach requires the availability of large-scale genomic data, which have been provided by recent reports detailing the genomes of several danionins. Facilitated by the large number of genetic tools that are available for manipulation of the most studied member of this subgroup - the zebrafish, Danio rerio - the danionins have emerged as a useful comparative model system. Here we review their phylogeny and outline the phenotypic traits that are distinct to individual species or genera. We highlight how functional genetic tools such as interspecies hybridization, mutagenesis and transgenesis, as well as the recently reported genome assemblies, have enabled new avenues for hypothesis-driven and technology-driven exploration that collectively establish danionins as important genetic models for understanding a wide range of evolutionary innovations.

Journal Article↗