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PubMed2001

GenEST, a powerful bidirectional link between cDNA sequence data and gene expression profiles generated by cDNA-AFLP.

The release of vast quantities of DNA sequence data by large-scale genome and expressed sequence tag (EST) projects underlines the necessity for the development of efficient and inexpensive ways to link sequence databases with temporal and spatial expression profiles. Here we demonstrate the power of linking cDNA sequence data (including EST sequences) with transcript profiles revealed by cDNA-AFLP, a highly reproducible differential display method based on restriction enzyme digests and selective amplification under high stringency conditions. We have developed a computer program (GenEST) that predicts the sizes of virtual transcript-derived fragments (TDFs) of in silico-digested cDNA sequences retrieved from databases. The vast majority of the resulting virtual TDFs could be traced back among the thousands of TDFs displayed on cDNA-AFLP gels. Sequencing of the corresponding bands excised from cDNA-AFLP gels revealed no inconsistencies. As a consequence, cDNA sequence databases can be screened very efficiently to identify genes with relevant expression profiles. The other way round, it is possible to switch from cDNA-AFLP gels to sequences in the databases. Using the restriction enzyme recognition sites, the primer extensions and the estimated TDF size as identifiers, the DNA sequence(s) corresponding to a TDF with an interesting expression pattern can be identified. In this paper we show examples in both directions by analyzing the plant parasitic nematode Globodera rostochiensis. Various novel pathogenicity factors were identified by combining ESTs from the infective stage juveniles with expression profiles of approximately 4000 genes in five developmental stages produced by cDNA-AFLP.

Animals↗
PubMed2025

Genomic resources for comparative analyses of obligate avian brood parasitism.

Examples of convergent evolution, wherein distantly related organisms evolve similar traits, including behaviors, underscore the adaptive power of natural selection. In birds, obligate brood parasitism, and the associated loss of parental care behaviors, has evolved independently in seven different lineages, though little is known about the genetic basis of the complex suite of traits associated with this rare life history strategy. We generated genome assemblies for ten brood parasitic species plus eight species representatives of their parental/nesting outgroups. This includes nine long-read chromosome-level assemblies, with scaffold N50 sizes ranging from 38.1 to 72.6 MB, and gene representation completeness measures >97%. Leveraging this new catalog of avian genomes, we constructed clade-level alignments that reveal variation in chromosomal synteny, provide first-time or improved annotations of protein-coding and non-coding genes, and define cross-species ortholog reference sets. We also refine estimates for the timing of the seven independent origins of brood parasitism, ranging from recent events such as 1.6 to 4.5 million years ago in Molothrus cowbirds to much earlier origins over 30 million years ago in two of the three cuckoo lineages. These genomic resources lay the foundation for investigating the genetic and genomic underpinnings of brood parasitism, including the loss of parental care, shifts in mating systems, perhaps resulting in heightened sperm competition, elevated annual fecundity, improved spatial cognition related to nest-finding, and the diverse adaptations shaped by intense coevolution with host species.

assemblies↗
PubMed2025

Spatial Metabolomics Reveals the Role of Penicillic Acid in Cheese Rind Microbiome Disruption by a Spoilage Fungus.

Microbial interactions in cheese rinds influence community structure, food safety, and product quality. But the chemical mechanisms that mediate microbial interactions in cheeses and other fermented foods are generally not known. Here, we investigate how the spoilage mold Aspergillus westerdijkiae chemically inhibits beneficial cheese-rind bacteria using a combination of omics technologies. In cheese rind community and co-culture experiments, A. westerdijkiae strongly inhibited most cheese rind community members. In co-culture with Staphylococcus equorum, A. westerdijkiae strongly affected bacterial gene expression, including upregulation of a putative bceAB gene cluster that is associated with resistance to antimicrobial compounds in other bacteria. Mass spectrometry imaging (MSI) revealed spatially localized production of secondary metabolites, including penicillic acid and ochratoxin B at the fungal-bacterial interface. Integration of LC-MS/MS and genome annotations confirmed the presence of additional bioactive metabolites, such as notoamides and circumdatins. Fungal metabolic responses varied by bacterial partner, suggesting species-specific chemical strategies. Notably, penicillic acid levels increased 2.5-fold during interaction with Brachybacterium, and experiments with purified penicillic acid showed inhibition of a range of cheese rind bacteria. These findings show that A. westerdijkiae deploys a context-dependent arsenal of mycotoxins and other metabolites, disrupting microbial community assembly in cheese rinds.

Aspergillus westerdijkiae↗
PubMed2025

Spatial-Temporal Diversity of Extrachromosomal DNA Shapes Urothelial Carcinoma Evolution and Tumor-Immune Microenvironment.

Extrachromosomal DNA (ecDNA) presents a promising target for cancer therapy; however, its spatial-temporal diversity and influence on tumor evolution and the immune microenvironment remain largely unclear. We apply computational methods to analyze ecDNA from whole-genome sequencing data of 595 urothelial carcinoma (UC) patients. We demonstrate that ecDNA drives clonal evolution through structural rearrangements during malignant transformation and recurrence of UC. This supports a model wherein tumors evolve via the selective expansion of ecDNA-bearing cells. Through multi-regional sampling of tumors, we demonstrate that ecDNA contributes to the evolution of multifocality and increased intratumoral heterogeneity. EcDNA is present in 36% of UC tumors and correlates with an immunosuppressive phenotype and poor prognosis. Single-cell RNA sequencing analyses reveal that ecDNA+ malignant cells exhibit diminished expression of major histocompatibility complex class I molecules, enabling them to evade T-cell immunity. Finally, we show that sequencing of urinary sediment-derived DNA has excellent specificity in detecting ecDNA.

Journal Article↗
PubMed2006

Microsatellite diversity and broad scale geographic structure in a model legume: building a set of nested core collection for studying naturally occurring variation in Medicago truncatula.

BACKGROUND: Exploiting genetic diversity requires previous knowledge of the extent and structure of the variation occurring in a species. Such knowledge can in turn be used to build a core-collection, i.e. a subset of accessions that aim at representing the genetic diversity of this species with a minimum of repetitiveness. We investigate the patterns of genetic diversity and population structure in a collection of 346 inbred lines representing the breadth of naturally occurring diversity in the Legume plant model Medicago truncatula using 13 microsatellite loci distributed throughout the genome. RESULTS: We confirm the uniqueness of all these genotypes and reveal a large amount of genetic diversity and allelic variation within this autogamous species. Spatial genetic correlation was found only for individuals originating from the same population and between neighbouring populations. Using a model-based clustering algorithm, we identified four main genetic clusters in the set of individuals analyzed. This stratification matches broad geographic regions. We also identified a set of "admixed" individuals that do not fit with this population structure scheme. CONCLUSION: The stratification inferred is discussed considering potential historical events like expansion, refuge history and admixture between neighbouring groups. Information on the allelic richness and the inferred population structure are used to build a nested core-collection. The set of inbred lines and the core collections are publicly available and will help coordinating efforts for the study of naturally occurring variation in the growing Medicago truncatula community.

DNA, Plant↗
PubMed1992

[Demonstration of clonal heterogeneity in adenocarcinomas on Barrett's esophagus by flow cytometric study of cellular DNA content].

Flow cytometry was used to examine the spatial distribution of nuclear DNA content in Barrett's mucosa, in one patient with high grade dysplasia and in 6 patients with Barrett's adenocarcinoma. All tumors were aneuploid. Each adenocarcinoma but the most advanced seemed to arise from a single clone of aneuploid or near-tetraploid cells which was found in all biopsy specimens taken from the tumor. Multiple aneuploid populations of cells were seen in the larger tumors. Eight clones were individualized in the most advanced case of cancer. In all patients with carcinoma, the mucosa surrounding the tumor was aneuploid. Some areas were characterized by the same DNA index as in the tumor, others contained distinct aneuploid cell populations. The spatial distributions of aneuploid clones and dysplastic areas were not perfectly superimposed. These data suggest that neoplastic progression in Barrett's esophagus is associated with genomic instability preceding the development of malignancy. Clonal heterogeneity in Barrett's adenocarcinoma is more marked when compared to other tumors and suggests a majoration of genomic instability during tumor progression.

Adenocarcinoma↗
PubMed2006

Spatial and temporal expression of Lactobacillus plantarum genes in the gastrointestinal tracts of mice.

Lactobacillus plantarum is a common inhabitant of mammalian gastrointestinal tracts, and L. plantarum strain WCFS1 is a human isolate with a known genome sequence. L. plantarum WCFS1 survives intestinal passage in an active form, and its transit time and transcriptional activities were monitored in 15 BALB/c mice at 2, 4, 6, 8, and 24 h after being fed a single intragastric dose of this organism. Enumeration of viable cells isolated from fecal material revealed that the majority of the L. plantarum inoculum transited the mouse intestine within 4 h after ingestion. Three mice were sacrificed at each time point, and total RNA was isolated from the mouse intestinal compartments (stomach through colon). Quantification of L. plantarum 16S rRNA by quantitative real-time reverse-transcription-PCR revealed that L. plantarum was present at elevated levels in the stomach and small intestine for at least 4 h following ingestion and for over 8 h in the cecum and colon. We also examined the expression of 9 L. plantarum housekeeping genes and 15 L. plantarum in vivo-inducible (ivi) genes previously identified by recombination-based in vivo expression technology to be induced in the mouse gastrointestinal tract. The relative expression levels of the ivi genes increased up to 350-fold in the mouse intestine compared to levels observed for L. plantarum WCFS1 cells grown in a rich laboratory medium. Moreover, several genes displayed intestinal compartment-specific (small intestine versus colon) activities. These results confirm that L. plantarum displays specific and differential responses at various sites along the mammalian intestine.

Animals↗
PubMed2003

Temporal and spatial expression of ammonium transporter genes during growth and development of Dictyostelium discoideum.

Ammonia is an important signaling molecule involved in the regulation of development in Dictyostelium. During aggregation, ammonia gradients are established, and the ammonia concentration in the immediate environment or within a particular cell throughout development may vary. This is due to the rate of cellular ammonia production, its rate of loss by evaporation to the atmosphere or by diffusion into the substratum, and perhaps to cellular transport by ammonium transporters (AMTs). Recent efforts in genome and cDNA sequencing have identified three ammonium transporters in Dictyostelium. In addition to physically altering the levels of ammonia within cells, AMTs also may play a role in ammonia signaling. As an initial step in identifying such a function, the temporal and spatial expression of the three amt genes is examined. RT-PCR demonstrates that each of the three amt mRNAs is present and relatively constant throughout growth and development. The spatial expression of these three amt genes is examined during multiple stages of Dictyostelium development using in situ hybridization. A distinct and dynamic pattern of expression is seen for the three genes. In general, amtA is expressed heavily in pre-stalk cells in a dynamic way, while amtB and amtC are expressed in pre-spore regions consistently throughout development. AmtC also is expressed in the most anterior tip of fingers and slugs, corresponding to cells that mediate ammonia's effect on the choice between slug migration and culmination. Indeed, amtC null cells have a slugger phenotype, suggesting AmtC functions in the signaling pathway underlying the mechanics of this choice.

Amino Acid Sequence↗
PubMed2004

Pluripotent lineage definition in bovine embryos by Oct4 transcript localization.

The POU-domain transcription factor Pou5f1 (Oct4) is restricted to pluripotent embryonic cells and the germ line of the mouse and is required for the maintenance of pluripotency of cells within the inner cell mass of the mouse blastocyst. Despite highly conserved genomic organization and regulatory regions between the mouse Oct4 gene and its bovine orthologue, bovine Oct4 protein is not restricted to the inner cell mass of blastocyst-stage embryos, suggesting that Oct4 may not be a key regulator of pluripotency in the bovine. We analyze the temporal and spatial distribution of Oct4 transcript in bovine oocytes and preimplantation-stage embryos, and in contrast to protein distribution, we find strong conservation between bovine and mouse. Oct4 transcript is present at low levels in the bovine oocyte. Similar to mouse, bovine Oct4 transcription begins one to two cell cycles after zygotic genome activation, followed by a sharp increase in transcription subsequent to compaction. Oct4 transcript is ubiquitously present in all cells of embryos at the morula stage; however, in Day 7 bovine blastocysts, Oct4 signal is not visible in the trophectoderm by in situ hybridization, indicating that transcriptional downregulation of Oct4 on differentiation is similar to that observed in mouse and other mammals. These results indicate that in contrast to protein distribution, regulation of Oct4 transcription is conserved between mammalian species.

Animals↗
PubMed2000

VI. Genome structure and cognitive map of Williams syndrome.

Williams syndrome (WMS) is a most compelling model of human cognition, of human genome organization, and of evolution. Due to a deletion in chromosome band 7q11.23, subjects have cardiovascular, connective tissue, and neurodevelopmental deficits. Given the striking peaks and valleys in neurocognition including deficits in visual-spatial and global processing, preserved language and face processing, hypersociability, and heightened affect, the goal of this work has been to identify the genes that are responsible, the cause of the deletion, and its origin in primate evolution. To do this, we have generated an integrated physical, genetic, and transcriptional map of the WMS and flanking regions using multicolor metaphase and interphase fluorescence in situ hybridization (FISH) of bacterial artificial chromosomes (BACs) and P1 artificial chromosomes (PACs), BAC end sequencing, PCR gene marker and microsatellite, large-scale sequencing, cDNA library, and database analyses. The results indicate the genomic organization of the WMS region as two nested duplicated regions flanking a largely single-copy region. There are at least two common deletion breakpoints, one in the centromeric and at least two in the telomeric repeated regions. Clones anchoring the unique to the repeated regions are defined along with three new pseudogene families. Primate studies indicate an evolutionary hot spot for chromosomal inversion in the WMS region. A cognitive phenotypic map of WMS is presented, which combines previous data with five further WMS subjects and three atypical WMS subjects with deletions; two larger (deleted for D7S489L) and one smaller, deleted for genes telomeric to FZD9, through LIMK1, but not WSCR1 or telomeric. The results establish regions and consequent gene candidates for WMS features including mental retardation, hypersociability, and facial features. The approach provides the basis for defining pathways linking genetic underpinnings with the neuroanatomical, functional, and behavioral consequences that result in human cognition.

Adolescent↗
PubMed2003

A spatially explicit individual-based model of reinforcement in hybrid zones.

An individual-based model consisting of two dioecious populations in a two-dimensional environmental grid was constructed. Each population began with, and never exceeded, 1000 individuals; extinction was allowed. Genomes consisting of 30 biallelic loci for male sexual advertisement call, female mate preference, and population origin were constructed, and lineages of each individual in the starting populations were followed for 2000 generations. Type and level of hybrid disadvantage, initial population distribution, patchiness of environmental resources, and level of mate choice were varied. Persistence of bimodal hybrid zones was nonexistent at low levels of hybrid disadvantage and universal at high levels of hybrid disadvantage, with a narrow threshold in which persistence was unpredictable. Persistence occurred at lower levels of hybrid disadvantage when populations were initially parapatric rather than sympatric, and environments were patchy rather than homogeneous. Increased divergence in mating systems occurred when hybrid disadvantage was high, hybrids were infertile, populations were initially parapatric, and increased female choice was allowed. Mating system divergence was much higher in interacting populations compared with noninteracting populations, indicating that reinforcement caused most of the observed divergence. When hybrids were infertile, reinforcement contributed to speciation, because under hybrid infertility the probability of persistence at low levels of hybrid disadvantage was positively related to mate choice. The results agree with previous one-dimensional spatial models in finding that population persistence is more likely in parapatric and patchy population distributions. In addition, the results show that hybrid infertility may facilitate the process of reinforcement and speciation.

Biological Evolution↗
PubMed2004

Description of an ultrathin multiwire proportional chamber-based detector and application to the characterization of the Spraguea lophii (Microspora) two-dimensional genome fingerprint.

Multiwire proportional chamber is a useful technology to build detectors that supersede the lack of interactivity of autoradiography in molecular biology experiments. Some drawbacks still limited the diffusion of existing instruments in biological laboratories. The major competitors are storage phosphor imaging systems. The simplified description of a radio-chromato-imager prototype (RCI) based on an original ultrathin multiwire proportional chamber is presented. It combines the advantage of the different existing technologies to present competitive properties in terms of efficiency, spatial resolution, robustness, manipulation easiness and production cost. Application of the RCI detector to molecular biology was performed by the analysis of karyotype and restriction display two-dimensional pulsed-field gel electrophoresis (KARD 2-D PFGE) data which are used to describe small eukaryotic genome structures. The comparative analysis with autoradiography was performed with the PDQuest software on Spraguea lophii (Microspora) genome fingerprints. The spot detection procedure applied to the different images leads to a similar conclusion considering the genome structure of S. lophii which appeared to be composed of 15 chromosomes for 13 karyotypic bands (200-880 kbp).

Animals↗
PubMed1997

mRNA stability and localisation of the low-temperature-responsive barley gene family blt14.

Transcription and translation inhibitors have been used to investigate the role of mRNA stability in the low-temperature-regulated expression of the post-transcriptionally controlled low temperature responsive barley gene family, blt14. Genomic clones (blt14.1, blt14.2) representing additional members of the blt14 gene family have been isolated and sequenced. Gene specific probes have been used to analyse the spatial expression of each individual member of the blt14 gene family. Findings indicate that all of the genes are responsive to low temperature, but the organ distribution is different for each gene. The results indicate that blt14.0 mRNA is stabilised by a low-temperature-dependent protein factor. Taken together, the results suggest that organ-specific post-transcriptional mechanisms are important in the low-temperature regulation of blt14 gene expression.

Amino Acid Sequence↗
PubMed1988

Transgenes as probes for active chromosomal domains in mouse development.

Embryonic development entails a well defined temporal and spatial programme of gene expression, which may be influenced by active chromosomal domains. These chromosomal domains can be detected using transgenes which integrate randomly throughout the genome, as their expression can be affected by chromosomal position. Position effects are probably exerted most strongly on transgenes that do not contain strong promoters, enhancers or other modulating sequences. Here we have systematically explored position effects using a transgene with the weak herpes-simplex-virus thymidine-kinase promoter, linked to the readily visualized lacZ indicator gene (HSV-TK-lacZ). Each transgenic fetus with detectable expression displayed a unique lacZ staining pattern. Thus expression of this construct is apparently dictated entirely by its chromosomal position, without any construct specificity. Furthermore the transgene is faithfully transmitted to subsequent generations, allowing for systematic mapping of changes in expression during development and in adult life. These results demonstrate that transgenes can indeed be powerful tools to probe the genome for active chromosomal regions, with the potential for identifying endogenous genes involved in organogenesis and pattern formation.

Animals↗
PubMed2001

Characterization of mouse Atp6i gene, the gene promoter, and the gene expression.

Solubilization of bone mineral by osteoclasts depends on the formation of an acidic extracellular compartment through the action of a V-type ATPase. We previously cloned a gene encoding a putative osteoclast-specific proton pump subunit, termed OC-116 kDa, approved mouse Atp6i (ATPase, H+ transporting, [vacuolar proton pump] member I). The function of Atp6i as osteoclast-specific proton pump subunit was confirmed in our mouse knockout study. However, the transcription regulation of Atp6i remains largely unknown. In this study, the gene encoding mouse Atp6i and the promoter have been isolated and completely sequenced. In addition, the temporal and spatial expressions of Atp6i have been characterized. Intrachromosomal mapping studies revealed that the gene contains 20 exons and 19 introns spanning approximately 11 kilobases (kb) of genomic DNA. Alignment of the mouse Atp6i gene exon sequence and predicted amino acid sequence to that of the human reveals a strong homology at both the nucleotide (82%) and the amino acid (80%) levels. Primer extension assay indicates that there is one transcription start site at 48 base pairs (bp) upstream of the initiator Met codon. Analysis of 4 kb of the putative promoter region indicates that this gene lacks canonical TATA and CAAT boxes and contains multiple putative transcription regulatory elements. Northern blot analysis of RNAs from a number of mouse tissues reveals that Atp6i is expressed predominantly in osteoclasts, and this predominant expression was confirmed by reverse-transcription polymerase chain reaction (RT-PCR) assay and immunohistochemical analysis. Whole-mount in situ hybridization shows that Atp6i expression is detected initially in the headfold region and posterior region in the somite stage of mouse embryonic development (E8.5) and becomes progressively restricted to anterior regions and the limb bud by E9.5. The expression level of Atp6i is largely reduced after E10.5. This is the first report of the characterizations of Atp6i gene, its promoter, and its gene expression patterns during mouse development. This study may provide valuable insights into the function of Atp6i, its osteoclast-selective expression, regulation, and the molecular mechanisms responsible for osteoclast activation.

Adenosine Triphosphatases↗
PubMed2026

Hormone priming and metabolic engineering of phytohormone crosstalk in rice under combined biotic and abiotic stresses: a multi-omics perspective for climate-resilient crop development.

Rice (Oryza sativa L.) is the caloric backbone for more than half of humanity, yet it remains one of the most vulnerable crops to the simultaneous biotic and abiotic stresses exacerbated by climate change. Phytohormone priming and the complex crosstalk networks governed by transcription factor hubs like WRKY, MYB, and NAC serve as the central adaptive mechanism for stress resilience. This review synthesizes how multi-omics integration, including spatial and single-cell transcriptomics, is resolving the molecular architecture of hormonal priming and epigenetic stress memory. We critically evaluate advanced metabolic engineering and genome-editing strategies such as CRISPR-Cas9, base/prime editing, and synthetic gene circuits that enable precision modifications to decouple stress tolerance from historical yield penalties. Furthermore, we discuss the emerging roles of microbiome-assisted priming via synthetic consortia and the application of artificial intelligence and digital twins (continuously updated computational models of crop physiology) for predictive stress management. By integrating these diverse technological pillars, we propose a systems-level roadmap for developing climate-resilient rice cultivars capable of maintaining yield stability across a volatile combinatorial stress landscape. This synthesis provides a framework for translating mechanistic hormonal insights into field-applicable cultivars to ensure global food security.

CRISPR↗
PubMed2002

Visualizing nuclear proteins together with transcribed and inactive genes in structurally preserved cells.

Recent data support the idea that the mammalian nucleus is organized in a functionally significant way. Immunocytochemistry has revealed the existence of diverse nuclear "bodies" and compartments. Fluorescence in situ hybridization (FISH) has shown that chromosomes change their spatial relationships during dynamic cell cycle progression and that nuclear organization can change during development and differentiation when patterns of gene expression are established or modified. To determine the relationship between nuclear organization and genome function is an important goal for biology. This article describes an immunoFISH technique, which is a useful tool for investigating the functional organization of the nucleus. It combines immunocytochemistry with FISH to allow associations between proteins, DNA, and RNA to be visualized in a single-step analysis using confocal microscopy. Immunocytochemistry and FISH were thought incompatible since cell preparation flattens nuclei and the harsh DNA denaturation treatment required for FISH destroys proteins. The immunoFISH technique successfully overcomes these problems and can reveal interactions between nuclear components not readily detectable using other experimental approaches. The interactions of single-copy, endogenous loci with nuclear proteins or bodies can be seen, as can spatial compartmentalization of these loci, in cells preserved in three dimensions, representative of the situation in vivo. Allelic differences in transcription can be related to nuclear location and protein interactions of the individual alleles since genes, RNA and proteins can be visualized together. Chromosome behavior can be followed through mitosis to investigate centromere activity or vector segregation efficiency, for example. Visual data obtained using the immunoFISH technique have provided insight into the functional significance of nuclear organization and its role in cell biology.

DNA-Binding Proteins↗
PubMed2026

Next-Generation Disease Profiling by Integrating Histopathology with Spatial Multi-Omics Data.

The field of pathology has experienced several transformative changes in recent years with the advent of digital pathology and spatial multi-omics. These technologies have enhanced every aspect of pathology practice, from streamlining daily workflows to generating high-fidelity multi-omics data that provide pathologists with novel tools to refine disease profiling and clinical diagnosis. Each layer of multimodal data (genomic, metabolomic, proteomic, or transcriptomic) has uncovered a distinct facet of disease pathologies, and combined with machine learning/artificial intelligence-based data analysis and pattern recognition models, has provided holistic understanding of regulatory mechanisms underpinning them. However, high-dimensional data have far exceeded the volume, scale, and complexity of immunostaining methods implemented by pathologists and, thus, have generated significant challenges related to deconvolution, interpretation, and clinical translation. Furthermore, these multimodal studies have predominantly relied on computational methods to process data and extract disease-relevant insights, thus raising questions around relevance or role of a pathologist in this new era of multi-omics. This review will provide a perspective on the evolving fields of molecular histopathology and spatial -omics, leveraging them to approach disease profiling, and redefining the role of a pathologist during this process.

Humans↗