GliaPub Date : 2025-02-01Epub Date: 2024-11-21DOI: 10.1002/glia.24650
Abigayle S Duffy, Ukpong B Eyo
{"title":"Microglia and Astrocytes in Postnatal Neural Circuit Formation.","authors":"Abigayle S Duffy, Ukpong B Eyo","doi":"10.1002/glia.24650","DOIUrl":"10.1002/glia.24650","url":null,"abstract":"<p><p>Over the past two decades, microglia and astrocytes have emerged as critical mediators of neural circuit formation. Particularly during the postnatal period, both glial subtypes play essential roles in orchestrating nervous system development through communication with neurons. These functions include regulating synapse elimination, modulating neuronal density and activity, mediating synaptogenesis, facilitating axon guidance and organization, and actively promoting neuronal survival. Despite the vital roles of both microglia and astrocytes in ensuring homeostatic brain development, the extent to which the postnatal functions of these cells are regulated by sex and the manner in which these glial cells communicate with one another to coordinate nervous system development remain less well understood. Here, we review the critical functions of both microglia and astrocytes independently and synergistically in mediating neural circuit formation, focusing our exploration on the postnatal period from birth to early adulthood.</p>","PeriodicalId":174,"journal":{"name":"Glia","volume":" ","pages":"232-250"},"PeriodicalIF":5.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142680029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kristin Ranheim Randel, Edoardo Botteri, Thomas de Lange, Anna Lisa Schult, Sigrun Losada Eskeland, Badboni El-Safadi, Espen R Norvard, Nils Bolstad, Michael Bretthauer, Geir Hoff, Øyvind Holme
{"title":"Performance of Faecal Immunochemical Testing for Colorectal Cancer Screening at Varying Positivity Thresholds.","authors":"Kristin Ranheim Randel, Edoardo Botteri, Thomas de Lange, Anna Lisa Schult, Sigrun Losada Eskeland, Badboni El-Safadi, Espen R Norvard, Nils Bolstad, Michael Bretthauer, Geir Hoff, Øyvind Holme","doi":"10.1111/apt.18314","DOIUrl":"10.1111/apt.18314","url":null,"abstract":"<p><strong>Background: </strong>The positivity thresholds of faecal immunochemical testing (FIT) in colorectal cancer (CRC) screening vary between countries.</p><p><strong>Aims: </strong>To explore the trade-off between colonoscopies performed, adverse events and lesions detected at different FIT thresholds in a Norwegian CRC screening trial.</p><p><strong>Methods: </strong>We included first participation in biennial FIT screening for 47,265 individuals aged 50-74 years. Individuals with FIT > 15 μg Hb/g faeces were referred for colonoscopy. We estimated the number of colonoscopies, adverse events, screen-detected CRCs, advanced adenomas and serrated lesions expected at FIT thresholds currently or recently used in other European countries ranging between 20 and 150 μg/g.</p><p><strong>Results: </strong>At the 15 μg/g threshold (Norway), 3705 participants underwent colonoscopy, of whom 203 had CRC, 1119 advanced adenomas and 256 advanced serrated lesions. Using a 47 μg/g threshold, 1826 (49.3%) individuals would have undergone colonoscopy, and 154 (75.9%) would have been diagnosed with CRC, 702 (62.7%) with advanced adenoma and 128 (50.0%) with advanced serrated lesion compared to the 15 μg/g threshold. At 150 μg/g, the corresponding figures would have been 838 (22.6%) undergoing colonoscopy, 114 (56.2%) with CRC, 345 (30.8%) advanced adenoma and 54 (21.1%) advanced serrated lesions. The detection rate of stage I CRC was 0.22% at 15 μg/g and 0.11% at 150 μg/g. Post-colonoscopy bleeding rates were 0.8% and 1.7%, respectively.</p><p><strong>Conclusions: </strong>Increasing the FIT threshold reduces colonoscopy demand, but substantially decreases lesion detection and unfavourably changes CRC stage distribution. The risk of adverse events at colonoscopy increased with FIT threshold, requiring country-specific information on adverse events.</p><p><strong>Trial registration: </strong>Clinicaltrials.gov identifier: NCT01538550.</p>","PeriodicalId":121,"journal":{"name":"Alimentary Pharmacology & Therapeutics","volume":" ","pages":"122-131"},"PeriodicalIF":6.6,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11636076/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142379619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Individualized HCC surveillance using risk stratification scores in advanced fibrosis and cirrhotic HCV patients who achieved SVR: Prospective study.","authors":"Gamal Shiha, Ayman Hassan, Nasser Mousa, Nada El-Domiaty, Nabiel Mikhail, Reham Gameaa, Abdelrahman Kobtan, Hanan El Bassat, Mohamed Sharaf-Eldin, Imam Waked, Mohamed Eslam, Riham Soliman","doi":"10.1111/apt.18291","DOIUrl":"10.1111/apt.18291","url":null,"abstract":"<p><strong>Background: </strong>Several HCC risk stratification scores were developed; however, none has been prospectively validated. The primary aim is to validate the clinical utility of six HCC risk scores in large prospective study of F3-4 patients achieving SVR following DAAs according to EASL guidelines. The secondary aim is to explore whether individualized risk stratification improves detection of HCC at early stages amenable to curative treatment.</p><p><strong>Methods: </strong>This prospective study included two cohorts: Egyptian Liver Research Institute and Hospital (ELRIAH) cohort of 463 chronic HCV patients with advanced liver disease (F3 and F4) achieved SVR with a follow-up every 6 months according to EASL guidelines using 6 simple HCC risk scores and Tanta cohort of 492 comparable patients where individualized surveillance intervals were tailored based on HCC risk assessments using GES score as follows: low-risk patients were followed yearly, intermediate-risk every 6 months and high-risk every 2-3 months.</p><p><strong>Results: </strong>All scores, except Watanabe post, successfully stratified patients into low-, intermediate- and high-risk groups, with log-rank p-value of 0.001 and Harrell's C ranging from 0.669 to 0.728. Clinical utility of these scores revealed that the highest percentage of patients classified as low risk was 42.5% using the GES, while the lowest was 8.9% using the aMAP. ELRIAH cohort, 25 patients developed HCC with 52% diagnosed at BCLC 0 and A. Tanta cohort, 35 patients developed HCC, with 80% diagnosed at BCLC 0 and A.</p><p><strong>Conclusion: </strong>Individualized risk stratification using HCC risk scores was associated with improved early-stage detection and receipt of curative treatment.</p>","PeriodicalId":121,"journal":{"name":"Alimentary Pharmacology & Therapeutics","volume":" ","pages":"99-108"},"PeriodicalIF":6.6,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
HepatologyPub Date : 2025-01-01Epub Date: 2024-03-15DOI: 10.1097/HEP.0000000000000842
Keyur Patel, Sumeet K Asrani, Maria Isabel Fiel, Deborah Levine, Daniel H Leung, Andres Duarte-Rojo, Jonathan A Dranoff, Tarek Nayfeh, Bashar Hasan, Tamar H Taddei, Yahya Alsawaf, Samer Saadi, Abdul Mounaem Majzoub, Apostolos Manolopoulos, Muayad Alzuabi, Jingyi Ding, Nigar Sofiyeva, Mohammad H Murad, Mouaz Alsawas, Don C Rockey, Richard K Sterling
{"title":"Accuracy of blood-based biomarkers for staging liver fibrosis in chronic liver disease: A systematic review supporting the AASLD Practice Guideline.","authors":"Keyur Patel, Sumeet K Asrani, Maria Isabel Fiel, Deborah Levine, Daniel H Leung, Andres Duarte-Rojo, Jonathan A Dranoff, Tarek Nayfeh, Bashar Hasan, Tamar H Taddei, Yahya Alsawaf, Samer Saadi, Abdul Mounaem Majzoub, Apostolos Manolopoulos, Muayad Alzuabi, Jingyi Ding, Nigar Sofiyeva, Mohammad H Murad, Mouaz Alsawas, Don C Rockey, Richard K Sterling","doi":"10.1097/HEP.0000000000000842","DOIUrl":"10.1097/HEP.0000000000000842","url":null,"abstract":"<p><strong>Background and aims: </strong>Blood-based biomarkers have been proposed as an alternative to liver biopsy for noninvasive liver disease assessment in chronic liver disease. Our aims for this systematic review were to evaluate the diagnostic utility of selected blood-based tests either alone, or in combination, for identifying significant fibrosis (F2-4), advanced fibrosis (F3-4), and cirrhosis (F4), as compared to biopsy in chronic liver disease.</p><p><strong>Approach and results: </strong>We included a comprehensive search of databases including Ovid MEDLINE(R), EMBASE, Cochrane Database, and Scopus through to April 2022. Two independent reviewers selected 286 studies with 103,162 patients. The most frequently identified studies included the simple aspartate aminotransferase-to-platelet ratio index and fibrosis (FIB)-4 markers (with low-to-moderate risk of bias) in HBV and HCV, HIV-HCV/HBV coinfection, and NAFLD. Positive (LR+) and negative (LR-) likelihood ratios across direct and indirect biomarker tests for HCV and HBV for F2-4, F3-4, or F4 were 1.66-6.25 and 0.23-0.80, 1.89-5.24 and 0.12-0.64, and 1.32-7.15 and 0.15-0.86, respectively; LR+ and LR- for NAFLD F2-4, F3-4, and F4 were 2.65-3.37 and 0.37-0.39, 2.25-6.76 and 0.07-0.87, and 3.90 and 0.15, respectively. Overall, the proportional odds ratio indicated FIB-4 <1.45 was better than aspartate aminotransferase-to-platelet ratio index <0.5 for F2-4. FIB-4 >3.25 was also better than aspartate aminotransferase-to-platelet ratio index >1.5 for F3-4 and F4. There was limited data for combined tests.</p><p><strong>Conclusions: </strong>Blood-based biomarkers are associated with small-to-moderate change in pretest probability for diagnosing F2-4, F3-4, and F4 in viral hepatitis, HIV-HCV coinfection, and NAFLD, with limited comparative or combination studies for other chronic liver diseases.</p>","PeriodicalId":177,"journal":{"name":"Hepatology","volume":" ","pages":"358-379"},"PeriodicalIF":12.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140136300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
HepatologyPub Date : 2025-01-01Epub Date: 2024-03-07DOI: 10.1097/HEP.0000000000000838
Juan Berenguer, Teresa Aldámiz-Echevarría, Víctor Hontañón, Chiara Fanciulli, Carmen Quereda, Carmen Busca, Lourdes Domínguez, Cristina Hernández, Jorge Vergas, Gabriel Gaspar, Lucio J García-Fraile, Cristina Díez, Marta De Miguel, José M Bellón, Rafael Bañares, Juan González-García
{"title":"Clinical outcomes and prognostic factors after HCV clearance with DAA in HIV/HCV-coinfected patients with advanced fibrosis/cirrhosis.","authors":"Juan Berenguer, Teresa Aldámiz-Echevarría, Víctor Hontañón, Chiara Fanciulli, Carmen Quereda, Carmen Busca, Lourdes Domínguez, Cristina Hernández, Jorge Vergas, Gabriel Gaspar, Lucio J García-Fraile, Cristina Díez, Marta De Miguel, José M Bellón, Rafael Bañares, Juan González-García","doi":"10.1097/HEP.0000000000000838","DOIUrl":"10.1097/HEP.0000000000000838","url":null,"abstract":"<p><strong>Background and aims: </strong>We assessed long-term clinical outcomes and prognostic factors for liver disease progression after sustained viral response with direct-acting antivirals in patients coinfected with HIV/HCV with advanced fibrosis or cirrhosis.</p><p><strong>Approach and results: </strong>A total of 1300 patients who achieved sustained viral response with direct-acting antivirals from 2014 to 2017 in Spain were included: 1145 with compensated advanced chronic liver disease (384 advanced fibrosis and 761 compensated cirrhosis) and 155 with decompensated cirrhosis. The median follow-up was 40.9 months. Overall, 85 deaths occurred, 61 due to non-liver non-AIDS-related causes that were the leading cause of death across all stages of liver disease. The incidence (95% CI) of decompensation per 100 person-years (py) was 0 in patients with advanced fibrosis, 1.01 (0.68-1.51) in patients with compensated cirrhosis, and 8.35 (6.05-11.53) in patients with decompensated cirrhosis. The incidence (95% CI) of HCC per 100 py was 0.34 (0.13-0.91) in patients with advanced fibrosis, 0.73 (0.45-1.18) in patients with compensated cirrhosis, and 1.92 (1.00-3.70) per 100 py in patients with decompensated cirrhosis. Prognostic factors for decompensation in patients with compensated advanced chronic liver disease included serum albumin, liver stiffness measurement (LSM), and fibrosis 4. In this population, LSM and LSM-based posttreatment risk stratification models showed their predictive ability for decompensation and HCC.</p><p><strong>Conclusions: </strong>Non-liver non-AIDS-related events were the leading causes of morbidity and mortality after direct-acting antiviral cure among coinfected patients with advanced fibrosis/cirrhosis. Among those with compensated advanced chronic liver disease, baseline LSM and posttreatment LSM-based models helped to assess decompensation and HCC risk.</p>","PeriodicalId":177,"journal":{"name":"Hepatology","volume":" ","pages":"238-253"},"PeriodicalIF":12.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11643110/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140058200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Letter to the Editor: Aspirin and GLP-1RAs-The missing confounders of empagliflozin for MASLD without diabetes mellitus?","authors":"Yue Hu, Zheng Li, Zhiping Li, Yaqin Zhao, Qing Liu, Qingfang Li, Xinran Cheng","doi":"10.1097/HEP.0000000000001033","DOIUrl":"10.1097/HEP.0000000000001033","url":null,"abstract":"","PeriodicalId":177,"journal":{"name":"Hepatology","volume":" ","pages":"E21-E22"},"PeriodicalIF":12.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141750656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant BiologyPub Date : 2025-01-01Epub Date: 2024-10-30DOI: 10.1111/plb.13733
M A Lehrer, R Govindarajulu, F Smith, J S Hawkins
{"title":"Shifts in plant architecture drive species-specific responses to drought in a Sorghum recombinant inbred line population.","authors":"M A Lehrer, R Govindarajulu, F Smith, J S Hawkins","doi":"10.1111/plb.13733","DOIUrl":"10.1111/plb.13733","url":null,"abstract":"<p><p>Drought stress severely impedes plant growth, development, and yield. Therefore, it is critical to uncover the genetic mechanisms underlying drought resistance to ensure future food security. To identify the genetic controls of these responses in Sorghum, an agriculturally and economically important grain crop, an interspecific recombinant inbred line (RIL) population was established by crossing a domesticated inbred line of Sorghum bicolor (TX7000) with its wild relative, Sorghum propinquum. This RIL population was evaluated under drought conditions, allowing for the identification of quantitative trait loci (QTL) that contribute to drought resistance. We detected eight QTL in the drought population that explain a significant portion of the observed variation for four traits (height, aboveground biomass, relative water content, and leaf temperature/transpiration). The allelic effects of, and the candidate genes within, these QTL emphasize: (1) the influence of domestication on drought-responsive phenotypes, such as height and aboveground biomass, and (2) how control of water uptake and/or loss can be driven by species-specific plant architecture. Our findings shed light on the interconnected roles of shoot and root responses in drought resistance as it relates to regulation of water uptake and/or loss, while the detected allelic effects demonstrate how maintenance of grain production and yield under drought is a likely result of domestication-derived drought tolerance.</p>","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"125-133"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142542420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant BiologyPub Date : 2025-01-01Epub Date: 2024-11-07DOI: 10.1111/plb.13735
L Zhao, Z Luo, Z Hu, Y Zhang, T Zhao, Y Zhong, X Wang
{"title":"Linking phylogenetic niche conservatism in bacterial communities in sorghum root compartments revealed by the Hongyingzi cultivar.","authors":"L Zhao, Z Luo, Z Hu, Y Zhang, T Zhao, Y Zhong, X Wang","doi":"10.1111/plb.13735","DOIUrl":"10.1111/plb.13735","url":null,"abstract":"<p><p>The root system harbours complex bacterial communities, which are critical for plant growth and health. Significant differences exist between bacterial communities in the root compartments; however, limited reports have explored their phylogenetic composition and niche conservatism in the root system of sorghum. We used the sorghum Hongyingzi cultivar as test plant, and applied 16S rRNA high-throughput sequencing and various statistical approaches. Phylogenetic composition of bacterial communities in root compartments were primarily driven by closely related species with similar environmental adaptations. We also found evidence of phylogenetic niche conservatism in bacterial communities for edaphic factors in the various root compartments, with pH and available N playing essential roles in shaping community composition. Environmental threshold analysis revealed threshold ranges of dominant taxa for pH and available N, indicating wider adaptive thresholds for more abundant taxa. Reconstruction of ancestral states suggested evolutionary changes in adaptability of certain bacterial taxa to edaphic factors, suggesting a shift towards slightly acidic, high N environments and reflecting the prolonged mutual interaction between bacteria and plants in cultivated soils. These findings enhance our understanding of environmental responses and evolutionary dynamics of root-associated microbiota in young sorghum plants and provide novel insights into ecological adaptations, shedding light on their responses to environmental factors. Our study contributes to a better understanding of the ecological dynamics of root-associated microbiota and offers analytical pathways for exploring the nutritional regulation of root microbiota.</p>","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"134-145"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142589960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Molecular EcologyPub Date : 2025-01-01Epub Date: 2024-11-21DOI: 10.1111/mec.17593
Connor M French, Roberta P Damasceno, Mariana M Vasconcellos, Miguel T Rodrigues, Ana C Carnaval, Michael J Hickerson
{"title":"Elevational Range Impacts Connectivity and Predicted Deme Sizes From Models of Habitat Suitability.","authors":"Connor M French, Roberta P Damasceno, Mariana M Vasconcellos, Miguel T Rodrigues, Ana C Carnaval, Michael J Hickerson","doi":"10.1111/mec.17593","DOIUrl":"10.1111/mec.17593","url":null,"abstract":"<p><p>In integrative distributional, demographic and coalescent (iDDC) modelling, a critical component is the statistical relationship between habitat suitability and local population sizes. This study explores this relationship in two Enyalius lizard species from the Brazilian Atlantic Forest: the high-elevation E. iheringii and low-elevation E. catenatus and how this transformation affects spatiotemporal demographic inference. Most previous iDDC studies assumed a linear relationship, but this study hypothesises that the relationship may be nonlinear, especially for high-elevation species with broader environmental tolerances. We test two key hypotheses: (1) The habitat suitability to population size relationship is nonlinear for E. iheringii (high-elevation) and linear for E. catenatus (low-elevation); and (2) E. iheringii exhibits higher effective migration across populations than E. catenatus. Our findings provide clear support for hypothesis (2), but mixed support for hypothesis (1), with strong model support for a nonlinear transformation in the high-elevation E. iheringii and some (albeit weak) support for a nonlinear transformation also in E. catenatus. The iDDC models allow us to generate landscape-wide maps of predicted genetic diversity for both species, revealing that genetic diversity predictions for the high-elevation E. iheringii align with estimated patterns of historical range stability, whereas predictions for low-elevation E. catenatus are distinct from range-wide stability predictions. This research highlights the importance of accurately modelling the habitat suitability to population size relationship in iDDC studies, contributing to our understanding of species' demographic responses to environmental changes.</p>","PeriodicalId":210,"journal":{"name":"Molecular Ecology","volume":" ","pages":"e17593"},"PeriodicalIF":4.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142680159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Molecular EcologyPub Date : 2025-01-01Epub Date: 2024-11-14DOI: 10.1111/mec.17572
Sean M Keogh, Nathan A Johnson, Chase H Smith, Bernard E Sietman, Jeffrey T Garner, Charles R Randklev, Andrew M Simons
{"title":"Secondary contact erodes Pleistocene diversification in a wide-ranging freshwater mussel (Quadrula).","authors":"Sean M Keogh, Nathan A Johnson, Chase H Smith, Bernard E Sietman, Jeffrey T Garner, Charles R Randklev, Andrew M Simons","doi":"10.1111/mec.17572","DOIUrl":"10.1111/mec.17572","url":null,"abstract":"<p><p>The isolated river drainages of eastern North America serve as a natural laboratory to investigate the roles of allopatry and secondary contact in the evolutionary trajectories of recently diverged lineages. Drainage divides facilitate allopatric speciation, but due to their sensitivity to climatic and geomorphological changes, neighboring rivers frequently coalesce, creating recurrent opportunities of isolation and contact throughout the history of aquatic lineages. The freshwater mussel Quadrula quadrula is widely distributed across isolated rivers of eastern North America and possesses high phenotypic and molecular variation across its range. We integrate sequence data from three genomes, including female- and male-inherited mitochondrial markers and thousands of nuclear encoded SNPs with morphology and geography to illuminate the group's divergence history. Across contemporary isolated rivers, we found continuums of molecular and morphological variation, following a pattern of isolation by distance. In contact zones, hybridization was frequent with no apparent fitness consequences, as advanced hybrids were common. Accordingly, we recognize Q. quadrula as a single cohesive species with subspecific variation (Q. quadrula rumphiana). Demographic modeling and divergence dating supported a divergence history characterized by allopatric vicariance followed by secondary contact, likely driven by river rearrangements and Pleistocene glacial cycles. Despite clinal range-wide variation and hybridization in contact zones, the process-based species delimitation tool delimitR, which considers demographic scenarios like secondary contact, supported the delimitation of the maximum number of species tested. As such, when interpreting species delimitation results, we suggest careful consideration of spatial sampling and subsequent geographic patterns of biological variation, particularly for wide-ranging taxa.</p>","PeriodicalId":210,"journal":{"name":"Molecular Ecology","volume":" ","pages":"e17572"},"PeriodicalIF":4.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142613325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}