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1.
Bioinformatics ; 39(10)2023 10 03.
Artículo en Inglés | MEDLINE | ID: mdl-37847655

RESUMEN

SUMMARY: Here, we presented the scHiCDiff software tool that provides both nonparametric tests and parametirc models to detect differential chromatin interactions (DCIs) from single-cell Hi-C data. We thoroughly evaluated the scHiCDiff methods on both simulated and real data. Our results demonstrated that scHiCDiff, especially the zero-inflated negative binomial model option, can effectively detect reliable and consistent single-cell DCIs between two conditions, thereby facilitating the study of cell type-specific variations of chromatin structures at the single-cell level. AVAILABILITY AND IMPLEMENTATION: scHiCDiff is implemented in R and freely available at GitHub (https://github.com/wmalab/scHiCDiff).


Asunto(s)
Carcinoma Intraductal no Infiltrante , Cromatina , Humanos , Cromosomas , Programas Informáticos , Modelos Estadísticos
2.
Bioinformatics ; 39(4)2023 04 03.
Artículo en Inglés | MEDLINE | ID: mdl-36961339

RESUMEN

SUMMARY: HiCube is a lightweight web application for interactive visualization and exploration of diverse types of genomics data at multiscale resolutions. Especially, HiCube displays synchronized views of Hi-C contact maps and 3D genome structures with user-friendly annotation and configuration tools, thereby facilitating the study of 3D genome organization and function. AVAILABILITY AND IMPLEMENTATION: HiCube is implemented in Javascript and can be installed via NPM. The source code is freely available at GitHub (https://github.com/wmalab/HiCube).


Asunto(s)
Genoma , Genómica , Programas Informáticos
3.
Angew Chem Int Ed Engl ; 63(11): e202318989, 2024 Mar 11.
Artículo en Inglés | MEDLINE | ID: mdl-38221223

RESUMEN

As bulky pollutants in industrial and agricultural wastewater, nitrate and formaldehyde pose serious threats to the human health and ecosystem. Current purification technologies including chemical and bio-/photo-/electro-chemical methods, are generally high-cost, time-consuming, or energy-intensive. Here, we report a novel formaldehyde-nitrate battery by pairing anodic formaldehyde oxidation with cathodic nitrate reduction, which simultaneously enables wastewater purification, electricity generation, and the production of high-value-added ammonia and formate. As a result, the formaldehyde-nitrate battery remarkably exhibits an open-circuit voltage of 0.75 V, a peak power density of 3.38 mW cm-2 and the yield rates of 32.7 mg h-1 cm-2 for ammonia and 889.4 mg h-1 cm-2 for formate. In a large-scale formaldehyde-nitrate battery (25 cm2 ), 99.9 % of nitrate and 99.8 % of formaldehyde are removed from simulated industrial wastewater and the electricity of 2.03 W⋅h per day is generated. Moreover, the design of such a multi-functional battery is universally applicable to the coupling of NO3 - or NO2 - reduction with various aldehyde oxidization, paving a new avenue for wastewater purification and chemical manufacturing.

4.
Int J Mol Sci ; 24(4)2023 Feb 13.
Artículo en Inglés | MEDLINE | ID: mdl-36835170

RESUMEN

Fish sex determination can be affected by environmental temperature. This process relies on temperature-sensitive proteins such as heat shock proteins (HSPs). Our previous work found that heat shock cognate proteins (HSCs) may participate in high-temperature associated sex reversal of Chinese tongue sole (Cynoglossus semilaevis). However, the role of hsc genes in responding to high temperature and affecting sex determination/differentiation remains unclear. Here, by using C. semilaevis as model, we identified hsc70 and hsc70-like. hsc70 was abundant in the gonads with a testicular-higher expression at all gonadal development stages except for 6 months post fertilization (mpf). Intriguingly, hsc70-like showed higher expression in testes from 6 mpf on. Both long-term heat treatment during the temperature-sensitive sex-determining period and short-term heat stress at the end of this period caused different expression of hsc70/hsc70-like between sexes. The dual-luciferase assay results also suggested that these genes can respond to high temperature rapidly in vitro. Heat treatment of C. semilaevis testis cells overexpressed with hsc70/hsc70-like could affect the expression of sex-related genes sox9a and cyp19a1a. Our results indicated that hsc70 and hsc70-like were key regulators linking external high-temperature signals with sex differentiation in vivo and provide a new idea for understanding the mechanism by which high temperature affects sex determination/differentiation in teleosts.


Asunto(s)
Peces Planos , Lenguado , Proteínas del Choque Térmico HSC70 , Procesos de Determinación del Sexo , Animales , Masculino , Proteínas de Peces/genética , Peces Planos/genética , Lenguado/genética , Proteínas de Choque Térmico/metabolismo , Respuesta al Choque Térmico , Proteínas del Choque Térmico HSC70/metabolismo , Procesos de Determinación del Sexo/genética
5.
Bioinformatics ; 37(Suppl_1): i272-i279, 2021 07 12.
Artículo en Inglés | MEDLINE | ID: mdl-34252966

RESUMEN

MOTIVATION: The high-throughput chromosome conformation capture (Hi-C) technique has enabled genome-wide mapping of chromatin interactions. However, high-resolution Hi-C data requires costly, deep sequencing; therefore, it has only been achieved for a limited number of cell types. Machine learning models based on neural networks have been developed as a remedy to this problem. RESULTS: In this work, we propose a novel method, EnHiC, for predicting high-resolution Hi-C matrices from low-resolution input data based on a generative adversarial network (GAN) framework. Inspired by non-negative matrix factorization, our model fully exploits the unique properties of Hi-C matrices and extracts rank-1 features from multi-scale low-resolution matrices to enhance the resolution. Using three human Hi-C datasets, we demonstrated that EnHiC accurately and reliably enhanced the resolution of Hi-C matrices and outperformed other GAN-based models. Moreover, EnHiC-predicted high-resolution matrices facilitated the accurate detection of topologically associated domains and fine-scale chromatin interactions. AVAILABILITY AND IMPLEMENTATION: EnHiC is publicly available at https://github.com/wmalab/EnHiC. SUPPLEMENTARY INFORMATION: Supplementary data are available at Bioinformatics online.


Asunto(s)
Cromatina , Programas Informáticos , Mapeo Cromosómico , Cromosomas , Humanos , Conformación Molecular
6.
BMC Ophthalmol ; 22(1): 230, 2022 May 21.
Artículo en Inglés | MEDLINE | ID: mdl-35597903

RESUMEN

PURPOSE: To compare the effect of bilateral inferior oblique partial myectomy on V-pattern exotropia patients with bilateral symmetric inferior oblique overaction (IOOA) and asymmetric IOOA. METHODS: This was a retrospective study including 53 V-pattern exotropia patients with bilateral IOOA of all grades who underwent bilateral inferior oblique partial myectomy. Success was defined as the elimination of the IOOA and the collapse of the V pattern at the final follow-up. The fovea-disc angle (FDA) and V-pattern exotropia were compared before and after surgery. RESULTS: This study included 53 V-pattern exotropia patients, containing 29 patients with symmetric IOOA (Group I) and 24 patients with asymmetric IOOA (Group II). The last follow-up ranged from 3 to 16 months (mean of 5 months). After myectomy, 3 eyes in Group I and 2 eyes in Group II were observed with residual grade 1 IOOA. The surgical success rates of IOOA correction in Group I and Group II were 96% and 95%, respectively. The difference was not statistically significant (P = 0.808). V-pattern exotropia collapsed with residual 2 (min. 0, max. 6) PD for Group I and 2 (min. 0, max. 10) PD for Group II, and there was a statistically significant difference between pre- and postoperative V-pattern exotropia in the two groups (P = 0.000). No inferior oblique (IO) underaction or antielevation syndrome (AES) was found in either group. The average preoperative FDA of the right eye and the left eye was (8.93 ± 4.34)° and (10.86 ± 4.27)° in Group I and (9.08 ± 4.92)° and (11.00 ± 5.69)° in Group II. There was a significant difference in preoperative FDA between the right eye and the left eye in the two groups (Group I p = 0.029; Group II p = 0.038). CONCLUSIONS: Bilateral inferior oblique partial myectomy can bring "symmetric" effectiveness in the correction of IOOA and FDA. It can potentially be used as a safe and successful treatment for V-pattern exotropia with bilateral IOOA. In addition, the FDA may be a promising index for evaluating fundus extorsion.


Asunto(s)
Exotropía , Enfermedades Musculares , Trastornos de la Motilidad Ocular , Enfermedades Orbitales , Estrabismo , Exotropía/cirugía , Movimientos Oculares , Humanos , Músculos Oculomotores/cirugía , Procedimientos Quirúrgicos Oftalmológicos , Estudios Retrospectivos , Estrabismo/cirugía , Resultado del Tratamiento , Visión Binocular
7.
Nucleic Acids Res ; 48(21): e123, 2020 12 02.
Artículo en Inglés | MEDLINE | ID: mdl-33074315

RESUMEN

The recently developed Hi-C technique has been widely applied to map genome-wide chromatin interactions. However, current methods for analyzing diploid Hi-C data cannot fully distinguish between homologous chromosomes. Consequently, the existing diploid Hi-C analyses are based on sparse and inaccurate allele-specific contact matrices, which might lead to incorrect modeling of diploid genome architecture. Here we present ASHIC, a hierarchical Bayesian framework to model allele-specific chromatin organizations in diploid genomes. We developed two models under the Bayesian framework: the Poisson-multinomial (ASHIC-PM) model and the zero-inflated Poisson-multinomial (ASHIC-ZIPM) model. The proposed ASHIC methods impute allele-specific contact maps from diploid Hi-C data and simultaneously infer allelic 3D structures. Through simulation studies, we demonstrated that ASHIC methods outperformed existing approaches, especially under low coverage and low SNP density conditions. Additionally, in the analyses of diploid Hi-C datasets in mouse and human, our ASHIC-ZIPM method produced fine-resolution diploid chromatin maps and 3D structures and provided insights into the allelic chromatin organizations and functions. To summarize, our work provides a statistically rigorous framework for investigating fine-scale allele-specific chromatin conformations. The ASHIC software is publicly available at https://github.com/wmalab/ASHIC.


Asunto(s)
Ensamble y Desensamble de Cromatina , Cromatina/ultraestructura , Mapeo Cromosómico/estadística & datos numéricos , Programas Informáticos , Alelos , Animales , Teorema de Bayes , Cromatina/metabolismo , Mapeo Cromosómico/métodos , Simulación por Computador , Diploidia , Fibroblastos/metabolismo , Fibroblastos/ultraestructura , Impresión Genómica , Histonas/genética , Histonas/metabolismo , Humanos , Factor II del Crecimiento Similar a la Insulina/genética , Factor II del Crecimiento Similar a la Insulina/metabolismo , Internet , Ratones , Polimorfismo de Nucleótido Simple
8.
Int J Mol Sci ; 23(15)2022 Aug 03.
Artículo en Inglés | MEDLINE | ID: mdl-35955739

RESUMEN

Maternal effector genes (MEGs) encode maternal RNA and protein, accumulating in the cytoplasm of oocytes. During oocyte development, MEGs participate in oocyte meiosis and promote oocyte development. And MEGs can also regulate maternal transcriptome stability and promote maternal-zygotic transition (MTZ) in early embryonic development. Long noncoding RNAs (lncRNAs), as new epigenetic regulators, can regulate gene expression at both the transcriptional and post-transcriptional levels through cis- or trans-regulation. The oogenesis-related gene org is a germ-cell-specific gene in fish, but the role of org in embryonic development and oogenesis has rarely been studied, and the knowledge of the lncRNA-mediated regulation of org is limited. In this study, we cloned and identified the org gene of Chinese tongue sole (Cynoglossus semilaevis), and we identified a lncRNA named lncRNA ORG-anti-sequence (ORG-AS), located at the reverse overlapping region of org. The results of qRT-PCR and FISH demonstrated that org was highly expressed during the early stages of embryonic development and oogenesis and was located in the cytoplasm of oocytes. ORG-AS was expressed at low levels in the ovary and colocalized with org in the cytoplasm of oocytes. In vitro experiments showed that overexpression of ORG-AS inhibited org expression. These results suggest that org, as a MEG in C. semilaevis, participates in the MTZ and the oogenesis. The lncRNA ORG-AS negatively regulates the gene expression of org through trans-regulation. These new findings broaden the function of MEGs in embryonic development and the oogenesis of bony fish and prove that lncRNAs are important molecular factors regulating org.


Asunto(s)
Peces Planos , Lenguado , ARN Largo no Codificante , Secuencia de Aminoácidos , Animales , Clonación Molecular , Femenino , Proteínas de Peces/genética , Proteínas de Peces/metabolismo , Peces Planos/genética , Peces Planos/metabolismo , Lenguado/genética , ARN Largo no Codificante/genética , ARN Largo no Codificante/metabolismo
9.
J Exp Bot ; 72(8): 3249-3262, 2021 04 02.
Artículo en Inglés | MEDLINE | ID: mdl-33544818

RESUMEN

Xa1-mediated resistance to rice bacterial blight, caused by Xanthomonas oryzae pv. oryzae (Xoo), is triggered by transcription activator-like effectors (TALEs) and suppressed by interfering TALEs (iTALEs). TALEs interact with the rice transcription factor OsTFIIAγ1 or OsTFIIAγ5 (Xa5) to activate expression of target resistance and/or susceptibility genes. However, it is not clear whether OsTFIIAγ is involved in TALE-triggered and iTALE-suppressed Xa1-mediated resistance. In this study, genome-edited mutations in OsTFIIAγ5 or OsTFIIAγ1 of Xa1-containing rice 'IRBB1' and Xa1-transgenic plants of xa5-containing rice 'IRBB5' did not impair the activation or suppression of Xa1-mediated resistance. Correspondingly, the expression pattern of Xa1 in mutated OsTFIIAγ5 and OsTFIIAγ1 rice lines and 'IRBB1' rice was similar. In contrast, the expression of OsSWEET11 was repressed in rice lines mutated in OsTFIIAγ5 and OsTFIIAγ1. Bimolecular fluorescence complementation (BiFC) and co-immunoprecipitation assays showed that both TALE PthXo1 and iTALE Tal3a interacted with OsTFIIAγ1 and OsTFIIAγ5 in plant nuclei. These results indicated that TALE-triggered and iTALE-suppressed Xa1-mediated resistance to bacterial blight is independent of OsTFIIAγ1 or OsTFIIAγ5 in rice, and suggest that an unknown factor is potentially involved in the interaction of Xa1, TALEs and iTALEs.


Asunto(s)
Resistencia a la Enfermedad , Oryza , Enfermedades de las Plantas/microbiología , Factores de Transcripción , Xanthomonas , Resistencia a la Enfermedad/genética , Oryza/genética , Enfermedades de las Plantas/genética , Proteínas de Plantas , Plantas Modificadas Genéticamente , Factores de Transcripción/genética
10.
BMC Microbiol ; 20(1): 91, 2020 04 15.
Artículo en Inglés | MEDLINE | ID: mdl-32293266

RESUMEN

BACKGROUND: Bacterial blight of cotton (BBC), which is caused by the bacterium Xanthomonas citri pv. malvacearum (Xcm), is a destructive disease in cotton. Transcription activator-like effectors (TALEs), encoded by tal-genes, play critical roles in the pathogenesis of xanthomonads. Characterized strains of cotton pathogenic Xcm harbor 8-12 different tal genes and only one of them is functionally decoded. Further identification of novel tal genes in Xcm strains with virulence contributions are prerequisite to decipher the Xcm-cotton interactions. RESULTS: In this study, we identified six tal genes in Xss-V2-18, a highly-virulent strain of Xcm from China, and assessed their role in BBC. RFLP-based Southern hybridization assays indicated that Xss-V2-18 harbors the six tal genes on a plasmid. The plasmid-encoded tal genes were isolated by cloning BamHI fragments and screening clones by colony hybridization. The tal genes were sequenced by inserting a Tn5 transposon in the DNA encoding the central repeat region (CRR) of each tal gene. Xcm TALome evolutionary relationship based on TALEs CRR revealed relatedness of Xss-V2-18 to MSCT1 and MS14003 from the United States. However, Tal2 of Xss-V2-18 differs at two repeat variable diresidues (RVDs) from Tal6 and Tal26 in MSCT1 and MS14003, respectively, inferred functional dissimilarity. The suicide vector pKMS1 was then used to construct tal deletion mutants in Xcm Xss-V2-18. The mutants were evaluated for pathogenicity in cotton based on symptomology and growth in planta. Four mutants showed attenuated virulence and all contained mutations in tal2. One tal2 mutant designated M2 was further investigated in complementation assays. When tal2 was introduced into Xcm M2 and expressed in trans, the mutant was complemented for both symptoms and growth in planta, thus indicating that tal2 functions as a virulence factor in Xcm Xss-V2-18. CONCLUSIONS: Overall, the results demonstrated that Tal2 is a major pathogenicity factor in Xcm strain Xss-V2-18 that contributes significantly in BBC. This study provides a foundation for future efforts aimed at identifying susceptibility genes in cotton that are targeted by Tal2.


Asunto(s)
Gossypium/microbiología , Análisis de Secuencia de ADN/métodos , Efectores Tipo Activadores de la Transcripción/genética , Xanthomonas/patogenicidad , Proteínas Bacterianas/genética , China , Elementos Transponibles de ADN , Gossypium/crecimiento & desarrollo , Mutación INDEL , Filogenia , Enfermedades de las Plantas/microbiología , Plásmidos/genética , Polimorfismo de Longitud del Fragmento de Restricción , Factores de Virulencia/genética , Xanthomonas/genética
11.
Genes Dev ; 26(24): 2802-16, 2012 Dec 15.
Artículo en Inglés | MEDLINE | ID: mdl-23249739

RESUMEN

In the vertebrate neural tube, regional Sonic hedgehog (Shh) signaling invokes a time- and concentration-dependent induction of six different cell populations mediated through Gli transcriptional regulators. Elsewhere in the embryo, Shh/Gli responses invoke different tissue-appropriate regulatory programs. A genome-scale analysis of DNA binding by Gli1 and Sox2, a pan-neural determinant, identified a set of shared regulatory regions associated with key factors central to cell fate determination and neural tube patterning. Functional analysis in transgenic mice validates core enhancers for each of these factors and demonstrates the dual requirement for Gli1 and Sox2 inputs for neural enhancer activity. Furthermore, through an unbiased determination of Gli-binding site preferences and analysis of binding site variants in the developing mammalian CNS, we demonstrate that differential Gli-binding affinity underlies threshold-level activator responses to Shh input. In summary, our results highlight Sox2 input as a context-specific determinant of the neural-specific Shh response and differential Gli-binding site affinity as an important cis-regulatory property critical for interpreting Shh morphogen action in the mammalian neural tube.


Asunto(s)
Tipificación del Cuerpo/fisiología , Proteínas Hedgehog/metabolismo , Factores de Transcripción de Tipo Kruppel/metabolismo , Factores de Transcripción SOXB1/metabolismo , Animales , Tipificación del Cuerpo/genética , Ratones , Ratones Transgénicos , Tubo Neural/embriología , Tubo Neural/metabolismo , Unión Proteica , Proteína con Dedos de Zinc GLI1
12.
Methods ; 142: 59-73, 2018 06 01.
Artículo en Inglés | MEDLINE | ID: mdl-29382556

RESUMEN

The folding and three-dimensional (3D) organization of chromatin in the nucleus critically impacts genome function. The past decade has witnessed rapid advances in genomic tools for delineating 3D genome architecture. Among them, chromosome conformation capture (3C)-based methods such as Hi-C are the most widely used techniques for mapping chromatin interactions. However, traditional Hi-C protocols rely on restriction enzymes (REs) to fragment chromatin and are therefore limited in resolution. We recently developed DNase Hi-C for mapping 3D genome organization, which uses DNase I for chromatin fragmentation. DNase Hi-C overcomes RE-related limitations associated with traditional Hi-C methods, leading to improved methodological resolution. Furthermore, combining this method with DNA capture technology provides a high-throughput approach (targeted DNase Hi-C) that allows for mapping fine-scale chromatin architecture at exceptionally high resolution. Hence, targeted DNase Hi-C will be valuable for delineating the physical landscapes of cis-regulatory networks that control gene expression and for characterizing phenotype-associated chromatin 3D signatures. Here, we provide a detailed description of method design and step-by-step working protocols for these two methods.


Asunto(s)
Mapeo Cromosómico/métodos , Desoxirribonucleasa I/metabolismo , Secuenciación de Nucleótidos de Alto Rendimiento/métodos , Imagenología Tridimensional/métodos , Imagen Molecular/métodos , Técnicas de Cultivo de Célula/instrumentación , Técnicas de Cultivo de Célula/métodos , Núcleo Celular/genética , Núcleo Celular/metabolismo , Cromatina/química , Cromatina/genética , Mapeo Cromosómico/instrumentación , Reactivos de Enlaces Cruzados/química , Enzimas de Restricción del ADN/química , Enzimas de Restricción del ADN/metabolismo , Desoxirribonucleasa I/química , Formaldehído/química , Biblioteca de Genes , Secuenciación de Nucleótidos de Alto Rendimiento/instrumentación , Imagenología Tridimensional/instrumentación , Imagen Molecular/instrumentación , Técnicas de Cultivo de Tejidos/instrumentación , Técnicas de Cultivo de Tejidos/métodos , Secuenciación Completa del Genoma/instrumentación , Secuenciación Completa del Genoma/métodos
13.
Nat Methods ; 12(1): 71-8, 2015 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-25437436

RESUMEN

High-throughput methods based on chromosome conformation capture have greatly advanced our understanding of the three-dimensional (3D) organization of genomes but are limited in resolution by their reliance on restriction enzymes. Here we describe a method called DNase Hi-C for comprehensively mapping global chromatin contacts. DNase Hi-C uses DNase I for chromatin fragmentation, leading to greatly improved efficiency and resolution over that of Hi-C. Coupling this method with DNA-capture technology provides a high-throughput approach for targeted mapping of fine-scale chromatin architecture. We applied targeted DNase Hi-C to characterize the 3D organization of 998 large intergenic noncoding RNA (lincRNA) promoters in two human cell lines. Our results revealed that expression of lincRNAs is tightly controlled by complex mechanisms involving both super-enhancers and the Polycomb repressive complex. Our results provide the first glimpse of the cell type-specific 3D organization of lincRNA genes.


Asunto(s)
Cromatina/fisiología , ARN no Traducido/genética , Cromatina/química , Cromatina/ultraestructura , Mapeo Cromosómico , Desoxirribonucleasa I/metabolismo , Genoma , Humanos , Células K562 , Conformación Proteica , Elementos Reguladores de la Transcripción/genética
14.
Bioinformatics ; 33(19): 3003-3010, 2017 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-28541376

RESUMEN

MOTIVATION: Transcription factors (TFs) bind to specific DNA sequence motifs. Several lines of evidence suggest that TF-DNA binding is mediated in part by properties of the local DNA shape: the width of the minor groove, the relative orientations of adjacent base pairs, etc. Several methods have been developed to jointly account for DNA sequence and shape properties in predicting TF binding affinity. However, a limitation of these methods is that they typically require a training set of aligned TF binding sites. RESULTS: We describe a sequence + shape kernel that leverages DNA sequence and shape information to better understand protein-DNA binding preference and affinity. This kernel extends an existing class of k-mer based sequence kernels, based on the recently described di-mismatch kernel. Using three in vitro benchmark datasets, derived from universal protein binding microarrays (uPBMs), genomic context PBMs (gcPBMs) and SELEX-seq data, we demonstrate that incorporating DNA shape information improves our ability to predict protein-DNA binding affinity. In particular, we observe that (i) the k-spectrum + shape model performs better than the classical k-spectrum kernel, particularly for small k values; (ii) the di-mismatch kernel performs better than the k-mer kernel, for larger k; and (iii) the di-mismatch + shape kernel performs better than the di-mismatch kernel for intermediate k values. AVAILABILITY AND IMPLEMENTATION: The software is available at https://bitbucket.org/wenxiu/sequence-shape.git. CONTACT: rohs@usc.edu or william-noble@uw.edu. SUPPLEMENTARY INFORMATION: Supplementary data are available at Bioinformatics online.


Asunto(s)
ADN/química , Análisis de Secuencia de ADN , Máquina de Vectores de Soporte , Factores de Transcripción/metabolismo , Sitios de Unión/genética , ADN/metabolismo , Proteínas de Unión al ADN/metabolismo , Genómica/métodos , Conformación de Ácido Nucleico , Motivos de Nucleótidos , Análisis por Matrices de Proteínas , Unión Proteica , Programas Informáticos
15.
PLoS Genet ; 11(3): e1005079, 2015 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-25785854

RESUMEN

X chromosome inactivation (XCI) silences most genes on one X chromosome in female mammals, but some genes escape XCI. To identify escape genes in vivo and to explore molecular mechanisms that regulate this process we analyzed the allele-specific expression and chromatin structure of X-linked genes in mouse tissues and cells with skewed XCI and distinguishable alleles based on single nucleotide polymorphisms. Using a binomial model to assess allelic expression, we demonstrate a continuum between complete silencing and expression from the inactive X (Xi). The validity of the RNA-seq approach was verified using RT-PCR with species-specific primers or Sanger sequencing. Both common escape genes and genes with significant differences in XCI status between tissues were identified. Such genes may be candidates for tissue-specific sex differences. Overall, few genes (3-7%) escape XCI in any of the mouse tissues examined, suggesting stringent silencing and escape controls. In contrast, an in vitro system represented by the embryonic-kidney-derived Patski cell line showed a higher density of escape genes (21%), representing both kidney-specific escape genes and cell-line specific escape genes. Allele-specific RNA polymerase II occupancy and DNase I hypersensitivity at the promoter of genes on the Xi correlated well with levels of escape, consistent with an open chromatin structure at escape genes. Allele-specific CTCF binding on the Xi clustered at escape genes and was denser in brain compared to the Patski cell line, possibly contributing to a more compartmentalized structure of the Xi and fewer escape genes in brain compared to the cell line where larger domains of escape were observed.


Asunto(s)
Inactivación del Cromosoma X , Animales , Factor de Unión a CCCTC , Desoxirribonucleasa I/metabolismo , Femenino , Ratones , Especificidad de Órganos , Polimorfismo de Nucleótido Simple , ARN Polimerasa II/metabolismo , Proteínas Represoras/metabolismo , Análisis de Secuencia de ARN
16.
Chaos ; 27(7): 073102, 2017 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-28764406

RESUMEN

The binary Darboux transformation method is applied to the coupled Sasa-Satsuma equations, which can be used to describe the propagation dynamics of femtosecond vector solitons in the birefringent fibers with third-order dispersion, self-steepening, and stimulated Raman scattering higher-order effects. An N-fold iterative formula of the resulting binary Darboux transformation is presented in terms of the quasideterminants. Via the simplest case of this formula, a few of illustrative explicit solutions to the coupled Sasa-Satsuma equations are generated from vanishing and non-vanishing backgrounds, which include the breathers, single- and double-hump bright vector solitons, and anti-dark vector solitons.

17.
Mol Plant Microbe Interact ; 27(9): 983-95, 2014 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-25105804

RESUMEN

The closely related plant pathogens Xanthomonas oryzae pv. oryzicola and X. oryzae pv. oryzae cause bacterial leaf streak (BLS) and bacterial leaf blight (BLB), respectively, in rice. Unlike X. oryzae pv. oryzae, endogenous avirulence-resistance (avr-R) gene interactions have not been identified in the X. oryzae pv. oryzicola-rice pathosystem, though both X. oryzae pv. oryzicola and X. oryzae pv. oryzae possess transcriptional activator-like effectors (TALE), which are known to modulate R or S genes in rice. In this report, avrXa7, avrXa10, and avrXa27 from X. oryzae pv. oryzae were transferred into YNB0-17 and RS105, hypovirulent and hypervirulent strains, respectively, of X. oryzae pv. oryzicola. When YNB0-17 containing avrXa7, avrXa10, or avrXa27 was inoculated to rice, hypersensitive responses (HR) were elicited in rice cultivars containing the R genes Xa7, Xa10, and Xa27, respectively. By contrast, RS105 expressing avrXa27 elicited an HR in a rice cultivar containing Xa27 but the expression of avrXa7 and avrXa10 in RS105 did not result in HR in rice cultivars containing Xa7 and Xa10, correspondingly. Southern blot analysis demonstrated that YNB0-17 possesses only approximately nine putative tale genes, whereas the hypervirulent RS105 contains at least 20. Although YNB0-17 contains an intact type III secretion system (T3SS), its genome is lacking the T3SS effector genes avrRxo1 and xopO, which are present in RS105. The introduction of avrRxo1 and xopO into YNB0-17 did not suppress avrXa7- or avrXa10-triggered immunity in rice. However, the transference of individual tale genes from RS105 into YNB0-17 led to the identification of tal6 and tal11a that suppressed avrXa7-Xa7-mediated defense. Thus, YNB0-17 may be a useful recipient for discovering such suppressors. This is the first report that co-evolutionally generated tale genes in X. oryzae pv. oryzicola suppress gene-for-gene defense against BLB, which may explain the lack of BLS-resistant cultivars.


Asunto(s)
Proteínas Bacterianas/genética , Oryza/inmunología , Enfermedades de las Plantas/inmunología , Transactivadores/genética , Xanthomonas/patogenicidad , Proteínas Bacterianas/metabolismo , Sistemas de Secreción Bacterianos , ADN Bacteriano/genética , Expresión Génica , Regulación Bacteriana de la Expresión Génica , Oryza/genética , Oryza/microbiología , Enfermedades de las Plantas/microbiología , Hojas de la Planta/genética , Hojas de la Planta/inmunología , Hojas de la Planta/microbiología , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Especificidad de la Especie , Transactivadores/metabolismo , Efectores Tipo Activadores de la Transcripción , Factores de Transcripción/genética , Factores de Transcripción/metabolismo , Virulencia , Xanthomonas/genética , Xanthomonas/aislamiento & purificación , Xanthomonas/fisiología
18.
Appl Environ Microbiol ; 80(13): 3908-19, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24747909

RESUMEN

The type III secretion system (T3SS), encoded by hrp (hypersensitive response and pathogenicity) genes in Gram-negative phytopathogenic bacteria, delivers repertoires of T3SS effectors (T3SEs) into plant cells to trigger the hypersensitive response (HR) in nonhost or resistant-host plants and promote pathogenicity in susceptible plants. The expression of hrp genes in Xanthomonas is regulated by two key regulatory proteins, HrpG and HrpX. However, the interactions between hrp gene products in directing T3SE secretion are largely unknown. Here we demonstrated that HrcT of X. oryzae pv. oryzicola functions as a T3SS component and positively regulates the expression of hrpX. Transcription of hrcT occurs via two distinct promoters; one (T1) is with the hrpB operon and the second (T3) within hrpB7 Via either promoter T1 or T3, the defect in Hrp phenotype by hrcT deletion was corrected in the presence of hrcT only from Xanthomonas species but not from other phytopathogenic bacteria. An N-terminally truncated HrcT was able to bind the hrpX promoter and activate the expression of hrpX, supporting that HrcT is a positive regulator of hrpX. A revised model showing the regulatory interactions between HrcT, HrpX, and HrpG is proposed.


Asunto(s)
Proteínas Bacterianas/biosíntesis , Sistemas de Secreción Bacterianos , Regulación Bacteriana de la Expresión Génica , Transactivadores/metabolismo , Factores de Transcripción/biosíntesis , Xanthomonas/genética , Xanthomonas/metabolismo , Proteínas Bacterianas/genética , ADN Bacteriano/metabolismo , Eliminación de Gen , Perfilación de la Expresión Génica , Prueba de Complementación Genética , Regiones Promotoras Genéticas , Unión Proteica , Transactivadores/genética , Factores de Transcripción/genética , Transcripción Genética
19.
Parasitol Res ; 113(3): 1233-8, 2014 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-24481902

RESUMEN

To enhance the anti-coccidial effect of dinitolmide and reduce its residual, the dinitolmide/MMT compounds were synthesized by the method of solution intercalation via dinitolmide intercalated into Na + -montmorillonite (Na + -MMT). The structure of compounds was characterized by X-ray diffraction and Fourier transformed infrared. Its anti-coccidial effect was examined by Eimeria tenella infection experiment. One hundred fifty AA broiler chickens were divided into five groups. Chickens were orally inoculated with 5 × 10(4) E. tenella oocysts after dinitolmide was given. Their curative effects were observed. The results showed that intercalated dinitolmide expanded the basal spacing (d 001) of MMT from 12.6 to 15.2 Å. The IR bands of amide group in dinitolmide/MMT were detected at 1,533 cm(-1) which showed that dinitolmide was successfully intercalated into the interlayer spaces of MMT. The dinitolmide/MMT showed higher anti-coccidian oocyst activity compared with dinitolmide (p < 0.05). The dinitolmide/MMT compound can significantly increase body weight gains and reduce bloody diarrhea, lesion score, and oocyst excretion. The anti-coccidia index of dinitolmide/MMT group (165.21) is much higher than dinitolmide group (88.84). The dinitolmide/MMT hybrid systems can be more effective in control of coccidiosis in comparison to dinitolmide.


Asunto(s)
Bentonita/farmacología , Coccidiosis/veterinaria , Coccidiostáticos/farmacología , Dinitolmida/farmacología , Eimeria tenella/efectos de los fármacos , Enfermedades de las Aves de Corral/tratamiento farmacológico , Animales , Pollos , Coccidiosis/tratamiento farmacológico , Sustancias Intercalantes/farmacología , Masculino , Oocistos/efectos de los fármacos , Aumento de Peso
20.
Sci Rep ; 14(1): 7678, 2024 04 01.
Artículo en Inglés | MEDLINE | ID: mdl-38561356

RESUMEN

The relationship between two variables is an essential factor in statistics, and the accuracy of the results depends on the data collected. However, the data collected for statistical analysis can be unclear and difficult to interpret. One way to predict how one variable will change about another is by using the correlation coefficient (CC), but this method is not commonly used in interval-valued Pythagorean fuzzy hypersoft set (IVPFHSS). The IVPFHSS is a more advanced and generalized form of the Pythagorean fuzzy hypersoft set (PFHSS), which allows for more precise and accurate analysis. In this research, we introduce the correlation coefficient (CC) and weighted correlation coefficient (WCC) for IVPFHSS and their essential properties. To demonstrate the applicability of these measures, we use the COVID-19 pandemic as an example and establish a prioritization technique for order preference by similarity to the ideal solution (TOPSIS) model. The technique is used to study the problem of optimizing the allocation of hospital beds during the pandemic. This study provides insights into the importance of utilizing correlation measures for decision-making in uncertain and complex situations like the COVID-19 pandemic. It is a robust multi-attribute decision-making (MADM) methodology with significant importance. Subsequently, it is planned to increase a dynamic bed allocation algorithm based on biogeography to accomplish the superlative decision-making system. Moreover, numerical investigations deliberate the best decision structures and deliver sensitivity analyses. The efficiency of our encouraged algorithm is more consistent than prevalent models, and it can effectively control and determine the optimal configurations for the study.


Asunto(s)
COVID-19 , Humanos , COVID-19/epidemiología , Pandemias , Algoritmos , Equipos y Suministros de Hospitales , Proyectos de Investigación
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