transcriptomic profiling

转录组学分析
  • 文章类型: Journal Article
    全球变暖导致植物环境压力增加,尤其是干旱。这会影响植物分布和物种适应性,一些药用植物表现出增强的耐旱性和增加的药用成分。在这项开创性的研究中,我们深入研究了Arnebiaguttata的复杂挂毯,一种以在干旱环境中的韧性而闻名的药用植物。通过将丰富的历史叙事与前沿的分析方法融合在一起,这项研究试图揭开植物对干旱胁迫的复杂反应,阐明其对药用价值的深远影响。
    该方法包括对A.guttata进行全面的考证和资源调查,区域化研究,现场样本分布分析,转录组和代谢组分析,根际土壤微生物组分析,和干旱胁迫实验。先进的计算工具,如ArcGIS,MaxEnt,并利用各种生物信息学软件进行数据分析和建模。
    该研究确定了来自不同地区的A.guttata样本之间的显着遗传变异,与环境因素相关,特别是在最温暖的季度(BIO18)的降水。代谢组学分析显示代谢物谱存在明显差异,包括紫草素含量,这对植物的药用特性至关重要。土壤微生物群落分析表明,变异可能会影响植物的代谢和胁迫响应。干旱胁迫实验证明了龙须菜的抗逆性及其调节代谢途径以增强耐旱性的能力。
    这些发现强调了基因组成之间复杂的相互作用,环境因素,和微生物群落在塑造古塔的适应性和药用价值中的作用。该研究提供了有关干旱胁迫如何影响活性化合物合成的见解,并表明适度的胁迫可以增强植物的药用特性。预测模型表明了古塔未来的合适生长区域,协助资源管理和保护工作。该研究有助于药用资源的可持续发展,并为改善五味子的栽培提供了策略。
    UNASSIGNED: Global warming has led to increased environmental stresses on plants, notably drought. This affects plant distribution and species adaptability, with some medicinal plants showing enhanced drought tolerance and increased medicinal components. In this pioneering study, we delve into the intricate tapestry of Arnebia guttata, a medicinal plant renowned for its resilience in arid environments. By fusing a rich historical narrative with cutting-edge analytical methodologies, this research endeavors to demystify the plant\'s intricate response to drought stress, illuminating its profound implications for medicinal valorization.
    UNASSIGNED: The methodology includes a comprehensive textual research and resource investigation of A. guttata, regionalization studies, field sample distribution analysis, transcriptome and metabolome profiling, rhizosphere soil microbiome analysis, and drought stress experiments. Advanced computational tools like ArcGIS, MaxEnt, and various bioinformatics software were utilized for data analysis and modeling.
    UNASSIGNED: The study identified significant genetic variations among A. guttata samples from different regions, correlating with environmental factors, particularly precipitation during the warmest quarter (BIO18). Metabolomic analysis revealed marked differences in metabolite profiles, including shikonin content, which is crucial for the plant\'s medicinal properties. Soil microbial community analysis showed variations that could impact plant metabolism and stress response. Drought stress experiments demonstrated A. guttata\'s resilience and its ability to modulate metabolic pathways to enhance drought tolerance.
    UNASSIGNED: The findings underscore the complex interplay between genetic makeup, environmental factors, and microbial communities in shaping A. guttata\'s adaptability and medicinal value. The study provides insights into how drought stress influences the synthesis of active compounds and suggests that moderate stress could enhance the plant\'s medicinal properties. Predictive modeling indicates future suitable growth areas for A. guttata, aiding in resource management and conservation efforts. The research contributes to the sustainable development of medicinal resources and offers strategies for improving the cultivation of A. guttata.
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  • 文章类型: Journal Article
    在肿瘤学中在大气压下操作的冷物理气体等离子体的治疗潜力已在许多临床前研究中得到充分证明。对恶性细胞的细胞毒性作用主要归因于生物活性血浆产生的化合物,即,活性氧和氮。细胞内活性氧和氮的积累强烈干扰恶性细胞的抗氧化防御系统,激活多个信号级联,不可避免地导致氧化应激诱导的细胞死亡。这项研究旨在确定血浆诱导的癌细胞死亡是否通过与癌细胞类型无关的通用分子机制起作用。使用整个转录组数据,我们试图研究患者来源的前列腺细胞培养物中血浆处理样品的活化机制,黑色素瘤,乳房,淋巴瘤和肺癌细胞。标准化单队列基因表达分析和平行多队列荟萃分析的结果强烈表明,血浆治疗通过免疫介导的机制在全球范围内诱导癌细胞死亡。如白细胞介素信号,Toll样受体级联,和MyD88激活导致促炎细胞因子释放和肿瘤抗原呈递。
    The therapeutic potential of cold physical gas plasma operated at atmospheric pressure in oncology has been thoroughly demonstrated in numerous preclinical studies. The cytotoxic effect on malignant cells has been attributed mainly to biologically active plasma-generated compounds, namely, reactive oxygen and nitrogen species. The intracellular accumulation of reactive oxygen and nitrogen species interferes strongly with the antioxidant defense system of malignant cells, activating multiple signaling cascades and inevitably leading to oxidative stress-induced cell death. This study aims to determine whether plasma-induced cancer cell death operates through a universal molecular mechanism that is independent of the cancer cell type. Using whole transcriptome data, we sought to investigate the activation mechanism of plasma-treated samples in patient-derived prostate cell cultures, melanoma, breast, lymphoma, and lung cancer cells. The results from the standardized single-cohort gene expression analysis and parallel multi-cohort meta-analysis strongly indicate that plasma treatment globally induces cancer cell death through immune-mediated mechanisms, such as interleukin signaling, Toll-like receptor cascades, and MyD88 activation leading to pro-inflammatory cytokine release and tumor antigen presentation.
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  • 文章类型: Journal Article
    双酚A(BPA)是日常塑料消费品制造中的常见成分。最近的研究表明,产前暴露于BPA可以增加后代对精神疾病的易感性,尽管潜在的机制仍不清楚.在这项研究中,我们在产前暴露于低剂量BPA后的成年小鼠大脑中进行了转录组和表观基因组分析.我们在大脑皮层观察到性别特异性转录失调,在雄性后代的成年皮质中观察到更显著的差异表达基因。此外,上调的基因主要影响神经元功能,而下调的基因与能量代谢途径显著相关。支持线粒体功能受损的更多证据包括BPA组的皮质神经元中ATP水平降低和线粒体数量减少。通过结合已发表的Hi-C数据,我们进一步研究了DEGs的高阶染色质调控模式。有趣的是,我们发现上调的基因与多个增强子表现出更多的远端相互作用,而下调的基因在相邻基因之间表现出相对较短的相互作用。我们的数据进一步显示,上调基因的远端增强子上的H3K9me3信号降低,而DNA甲基化和H3K27me3信号在下调基因的启动子上增加。总之,我们的研究提供了与产前暴露于BPA相关的潜在健康风险的令人信服的证据,并通过多种表观遗传机制的复杂相互作用揭示性别特异性转录变化。
    Bisphenol A (BPA) is a common component in the manufacture of daily plastic consumer goods. Recent studies have suggested that prenatal exposure to BPA can increase the susceptibility of offspring to mental illness, although the underlying mechanisms remain unclear. In this study, we performed transcriptomic and epigenomic profiling in the adult mouse brain following prenatal exposure to low-dose BPA. We observed a sex-specific transcriptional dysregulation in the cortex, with more significant differentially expressed genes was observed in adult cortex from male offspring. Moreover, the upregulated genes primarily influenced neuronal functions, while the downregulated genes were significantly associated with energy metabolism pathways. More evidence supporting impaired mitochondrial function included a decreased ATP level and a reduced number of mitochondria in the cortical neuron of the BPA group. We further investigated the higher-order chromatin regulatory patterns of DEGs by incorporating published Hi-C data. Interestingly, we found that upregulated genes exhibited more distal interactions with multiple enhancers, while downregulated genes displayed relatively short-range interactions among adjacent genes. Our data further revealed decreased H3K9me3 signal on the distal enhancers of upregulated genes, whereas increased DNA methylation and H3K27me3 signals on the promoters of downregulated genes. In summary, our study provides compelling evidence for the potential health risks associated with prenatal exposure to BPA, and uncovers sex-specific transcriptional changes with a complex interplay of multiple epigenetic mechanisms.
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  • 文章类型: Journal Article
    心血管疾病是一系列与年龄有关的疾病,越来越多的证据表明心脏驻留巨噬细胞(CRM)与年龄相关的疾病之间存在联系。然而,CRM如何随着老化而改变仍然难以捉摸。在本研究中,老年小鼠(20个月大)已被用来检查其心脏结构和功能的改变,以及CRM子集比例的变化,然后对CRM进行排序,包括C-C基序趋化因子受体2(CCR2)和CCR2-CRM,受到智能序列的影响。对Smart-Seq数据与三个公开可用的单细胞RNA-seq数据集的综合分析显示,随着年龄的增长,CCR2和CCR2-CRM的炎症基因均急剧上调。但是与伤口愈合密切相关的基因在CCR2-CRM中下调,建议这两个子集的微分函数。更重要的是,参与损伤感知的炎症基因,互补级联,在CCR2-CRM中,吞噬作用在很大程度上上调,这意味着衰老时炎症反应的失衡。我们的工作提供了一个全面的框架和转录资源,用于评估衰老对CRM的影响,并有可能进一步了解心脏衰老。
    Cardiovascular diseases are an array of age-related disorders, and accumulating evidence suggests a link between cardiac resident macrophages (CRMs) and the age-related disorders. However, how does CRMs alter with aging remains elusive. In the present study, aged mice (20 months old) have been employed to check for their cardiac structural and functional alterations, and the changes in the proportion of CRM subsets as well, followed by sorting of CRMs, including C-C Motif Chemokine Receptor 2 (CCR2)+ and CCR2- CRMs, which were subjected to Smart-Seq. Integrated analysis of the Smart-Seq data with three publicly available single-cell RNA-seq datasets revealed that inflammatory genes were drastic upregulated for both CCR2+ and CCR2- CRMs with aging, but genes germane to wound healing were downregulated for CCR2- CRMs, suggesting the differential functions of these two subsets. More importantly, inflammatory genes involved in damage sensing, complement cascades, and phagocytosis were largely upregulated in CCR2- CRMs, implying the imbalance of inflammatory response upon aging. Our work provides a comprehensive framework and transcriptional resource for assessing the impact of aging on CRMs with a potential for further understanding cardiac aging.
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  • 文章类型: Journal Article
    接触持久性有机污染物(POPs),如二氯二苯基三氯乙烷(DDT)和多氯联苯(PCB),历史上一直与野生动物种群崩溃有关。尽管有国际法规,这些遗留化学物质目前仍在育龄妇女中检测到,它们的水平与卵巢储备减少有关,怀孕时间更长,和更高的不孕风险。然而,这些关联的具体作用方式尚不清楚.这里,我们研究了五种常见的持久性有机污染物-六氯苯(HCB)的影响,p,对二氯二苯基二氯乙烯(DDE),2,3,3\',4,4\',5-六氯联苯(PCB156),2,2\',3,4,4',5,5'-七氯联苯(PCB180),全氟辛烷磺酸(PFOS)-及其混合物在体外人卵巢中的作用。我们暴露了人卵巢癌细胞系COV434,KGN,和PA1以及原代卵巢细胞24小时,和含有单层卵泡的卵巢组织持续6天。暴露于涵盖流行病学相关水平的浓度的样品的RNA测序显示,与暴露细胞中中枢能量代谢相关的显著基因表达变化。表明糖酵解,氧化磷酸化,脂肪酸代谢,和活性氧作为卵巢细胞中POP暴露的潜在共享目标。α-烯醇化酶(ENO1),乳酸脱氢酶A(LDHA),细胞色素C氧化酶亚基4I1(COX4I1),ATP合酶F1亚基α(ATP5A),在KGN的其他细胞培养实验中,通过qPCR验证了谷胱甘肽过氧化物酶4(GPX4)作为靶标。在卵巢组织培养中,我们观察到暴露对卵泡生长和闭锁以及蛋白质表达的显著影响。所有POP暴露,除PCB180外,单层卵泡比例降低,卵泡闭锁增加。免疫染色证实LDHA表达改变,ATP5A,和GPX4在暴露的组织中。此外,POP暴露改变了KGN和组织培养中的ATP产生。总之,我们的结果表明,细胞能量代谢的破坏是POP介导的人类卵巢卵泡生长干扰的一种新的作用方式.
    Exposure to persistent organic pollutants (POPs), such as dichlorodiphenyltrichloroethane (DDT) and polychlorinated biphenyls (PCBs), has historically been linked to population collapses in wildlife. Despite international regulations, these legacy chemicals are still currently detected in women of reproductive age, and their levels correlate with reduced ovarian reserve, longer time-to-pregnancy, and higher risk of infertility. However, the specific modes of action underlying these associations remain unclear. Here, we examined the effects of five commonly occurring POPs - hexachlorobenzene (HCB), p,p\'-dichlorodiphenyldichloroethylene (DDE), 2,3,3\',4,4\',5-hexachlorobiphenyl (PCB156), 2,2\',3,4,4\',5,5\'-heptachlorobiphenyl (PCB180), perfluorooctane sulfonate (PFOS) - and their mixture on human ovaries in vitro. We exposed human ovarian cancer cell lines COV434, KGN, and PA1 as well as primary ovarian cells for 24 h, and ovarian tissue containing unilaminar follicles for 6 days. RNA-sequencing of samples exposed to concentrations covering epidemiologically relevant levels revealed significant gene expression changes related to central energy metabolism in the exposed cells, indicating glycolysis, oxidative phosphorylation, fatty acid metabolism, and reactive oxygen species as potential shared targets of POP exposures in ovarian cells. Alpha-enolase (ENO1), lactate dehydrogenase A (LDHA), cytochrome C oxidase subunit 4I1 (COX4I1), ATP synthase F1 subunit alpha (ATP5A), and glutathione peroxidase 4 (GPX4) were validated as targets through qPCR in additional cell culture experiments in KGN. In ovarian tissue cultures, we observed significant effects of exposure on follicle growth and atresia as well as protein expression. All POP exposures, except PCB180, decreased unilaminar follicle proportion and increased follicle atresia. Immunostaining confirmed altered expression of LDHA, ATP5A, and GPX4 in the exposed tissues. Moreover, POP exposures modified ATP production in KGN and tissue culture. In conclusion, our results demonstrate the disruption of cellular energy metabolism as a novel mode of action underlying POP-mediated interference of follicle growth in human ovaries.
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  • 文章类型: Journal Article
    年龄相关性皮质下深部白质病变(DSCLs)是痴呆的独立危险因素,显示高水平的CD68+小胶质细胞。这项研究旨在表征DSCL和周围放射学上正常出现的白质(NAWM)中小胶质细胞的转录组学特征。使用免疫激光捕获显微解剖从认知功能和衰老研究神经病理学队列的白质组(每组n=4例)中分离出CD68+小胶质细胞。微阵列基因表达谱分析,但不是RNA测序,在CFAS队列中发现与免疫LCM基因的死后材料相容,并鉴定出显著差异表达的基因(DEGs)。使用注释可视化和集成发现数据库(DAVID)软件评估功能分组和途径分析,并进行免疫组织化学以验证蛋白质水平的基因表达变化。与非病变对照白质相比,DSCL中小胶质细胞的转录组学分析鉴定出181个显着的DEG(93个上调,88个下调)。DAVID中的功能聚类分析显示结合珠蛋白-血红蛋白结合的失调(富集评分2.5,p=0.017),使用CD163免疫染色证实,提示DSCLs对血脑屏障功能障碍的神经保护性小胶质细胞反应。在NAWM和控制白质中,小胶质细胞表现出347个DEG(209个上调,138下调),具有蛋白质去泛素化的显着失调(富集评分5.14,p<0.001),这意味着NAWM无法维持蛋白质稳态,这可能导致病变扩散。这些发现增强了对衰老白质病理学中小胶质细胞转录组变化的理解,强调DSCLs小胶质细胞的神经保护性适应和NAWM小胶质细胞的潜在损害促进表型。
    Age-associated deep-subcortical white matter lesions (DSCLs) are an independent risk factor for dementia, displaying high levels of CD68+ microglia. This study aimed to characterize the transcriptomic profile of microglia in DSCLs and surrounding radiologically normal-appearing white matter (NAWM) compared to non-lesional control white matter. CD68+ microglia were isolated from white matter groups (n = 4 cases per group) from the Cognitive Function and Ageing Study neuropathology cohort using immuno-laser capture microdissection. Microarray gene expression profiling, but not RNA-sequencing, was found to be compatible with immuno-LCM-ed post-mortem material in the CFAS cohort and identified significantly differentially expressed genes (DEGs). Functional grouping and pathway analysis were assessed using the Database for Annotation Visualization and Integrated Discovery (DAVID) software, and immunohistochemistry was performed to validate gene expression changes at the protein level. Transcriptomic profiling of microglia in DSCLs compared to non-lesional control white matter identified 181 significant DEGs (93 upregulated and 88 downregulated). Functional clustering analysis in DAVID revealed dysregulation of haptoglobin-haemoglobin binding (Enrichment score 2.5, p = 0.017), confirmed using CD163 immunostaining, suggesting a neuroprotective microglial response to blood-brain barrier dysfunction in DSCLs. In NAWM versus control white matter, microglia exhibited 347 DEGs (209 upregulated, 138 downregulated), with significant dysregulation of protein de-ubiquitination (Enrichment score 5.14, p < 0.001), implying an inability to maintain protein homeostasis in NAWM that may contribute to lesion spread. These findings enhance understanding of microglial transcriptomic changes in ageing white matter pathology, highlighting a neuroprotective adaptation in DSCLs microglia and a potentially lesion-promoting phenotype in NAWM microglia.
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  • 文章类型: Journal Article
    急性髓系白血病(AML),影响骨髓细胞的快速发展的血液恶性肿瘤,通常用化疗或造血干细胞移植治疗。然而,大约一半的患者面临复发,5年生存率很低.以促进双重特异性为目标,增强抗肿瘤活性,并将抗原逃逸的风险降至最低,这项研究的重点是结合嵌合抗原受体(CAR)和T细胞受体(TCR)技术。CAR\'TCR-T细胞,共表达CD33-CAR和转基因dNPM1-TCR,显示体外抗肿瘤活性增加和延长,特别是在低靶抗原表达的情况下。不同的转录组特征表明免疫突触的形成增强,激活,和信号。AML异种移植物在体内的完全消除只能用含有CAR/TCR-T的细胞产物实现,CAR-T,和TCR-T细胞,表示与编码CAR或TCR的两种慢病毒载体共转导的结果。CAR-T和TCR-T细胞的混合物,没有CAR\'TCR-T细胞,没有阻止进行性肿瘤生长,与分别用CAR-T和TCR-T细胞治疗相当。总的来说,我们的数据强调了在一个T细胞中共表达CAR和转基因TCR的功效,并可能为AML和其他恶性肿瘤开辟一条新的治疗途径。
    Acute myeloid leukemia (AML), a fast-progressing hematological malignancy affecting myeloid cells, is typically treated with chemotherapy or hematopoietic stem cell transplantation. However, approximately half of the patients face relapses and 5-year survival rates are poor. With the goal to facilitate dual-specificity, boosting anti-tumor activity, and minimizing the risk for antigen escape, this study focused on combining chimeric antigen receptor (CAR) and T cell receptor (TCR) technologies. CAR\'TCR-T cells, co-expressing a CD33-CAR and a transgenic dNPM1-TCR, revealed increased and prolonged anti-tumor activity in vitro, particularly in case of low target antigen expression. The distinct transcriptomic profile suggested enhanced formation of immunological synapses, activation, and signaling. Complete elimination of AML xenografts in vivo was only achieved with a cell product containing CAR\'TCR-T, CAR-T, and TCR-T cells, representing the outcome of co-transduction with two lentiviral vectors encoding either CAR or TCR. A mixture of CAR-T and TCR-T cells, without CAR\'TCR-T cells, did not prevent progressive tumor outgrowth and was comparable to treatment with CAR-T and TCR-T cells individually. Overall, our data underscore the efficacy of co-expressing CAR and transgenic TCR in one T cell, and might open a novel therapeutic avenue not only for AML but also other malignancies.
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  • 文章类型: Journal Article
    多形性胶质母细胞瘤(GBM)IDH-野生型是成人中最常见的脑恶性肿瘤。然而,分子机制,导致GBM的原因尚未完全阐明。粒细胞集落刺激因子(GCSF),粒细胞集落刺激因子受体GCSFR,信号转导和转录激活因子3(STAT3)参与了多种癌症的发生和发展,但它们在GBM中的作用鲜为人知。在这里,我们研究了GCSF的基因和蛋白质表达,GCSFR,和STAT3在21个组织活检样本,也在肿瘤相关的正常组织(TANT)样本来源于胶质母细胞瘤患者,这揭示了这些基因的显著差异表达。为了验证我们的发现,通过从基因组图谱数据库检索GBMRNA序列数据,我们对各自基因的转录组和蛋白质组谱分析进行了综合整合分析.GO和KEGG分析揭示了疾病相关途径的富集,如JAK/STAT通路激活,与GBM进展相关。我们进一步进行了潜在候选药物Nisin对GCSF的计算对接分析,并使用人胶质母细胞瘤细胞系SF-767以剂量依赖性方式通过细胞毒性活性测定在体外验证结果。我们的综合分析表明,GCSF增加神经胶质瘤的进展,用抗癌细菌素肽Nisin阻断可以潜在地抑制GBM的生长和转移。
    Glioblastoma multiforme (GBM) IDH-wildtype is the most prevalent brain malignancy in adults. However, molecular mechanisms, which leads to GBM have not been completely elucidated. Granulocyte colony-stimulating factor (GCSF), Granulocyte colony-stimulating factor receptor GCSFR, and Signal transducers and activators of transcription 3 (STAT3) have been involved in the occurrence and development of various cancers, but their role in GBM is little known. Herein, we have investigated the gene and protein expression of GCSF, GCSFR, and STAT3 in 21 tissue biopsy samples and also in tumor associated normal tissue (TANT) samples derived from glioblastoma patients, which revealed significantly differential expression of these genes. To validate our findings, we performed a comprehensive integrated analysis of transcriptomic and proteomic profiling of respective genes by retrieving GBM RNA-sequence data from Genome Atlas Databases. GO and KEGG analysis revealed enrichment in disease-related pathways, such as JAK/STAT pathway activation, which were associated with GBM progression. We further performed computational docking analysis of potential drug candidate Nisin against GCSF, and the results were validated in vitro through cytotoxic activity assay using a human glioblastoma cell line SF-767 in a dose-dependent manner. Our comprehensive analysis reveals that GCSF augments glioma progression, and its blockade with anticancer bacteriocin peptide Nisin can potentially inhibit the growth and metastasis of GBM.
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  • 文章类型: Journal Article
    饲料效率是猪感兴趣的特征,因为它有助于降低猪生产的生态和经济成本。从大型白猪种群中进行了10代不同的遗传选择实验,导致猪品系具有相对低(LRFI)和高(HRFI)的残余饲料摄入量(RFI)。先前已经报道了这两条线之间的喂养行为和代谢差异。我们假设这些差异的一部分可能与近端肠道中营养的差异感知和吸收有关。我们调查了LRFI和HRFI猪(n=24)中过夜禁食和随意喂食的十二指肠转录组和DNA甲基化谱。我们确定了两个品系之间的1,106个差异表达基因,特别影响跨膜转运活性的途径,并与有丝分裂或染色体分离有关。与HRFI系相比,LRFI系显示出对饲料摄入量的更大转录组响应。饲料摄入影响了猪十二指肠中合成代谢和分解代谢途径的基因,如rRNA产生和自噬。几种营养转运蛋白和紧密连接基因在品系之间和/或通过短期饲料摄入差异表达。我们还确定了两条线之间十二指肠粘膜中的409个差异甲基化区域,而这种表观遗传标记受摄食影响较小。我们的发现强调,猪饲料效率的遗传选择改变了十二指肠的转录组概况,尤其是它对饲料摄入量的反应,提示该近端肠段在饲料效率机制中的关键作用。新和注意十二指肠是饥饿/饱腹感循环和营养感知的关键器官。我们研究了猪的饲料摄入量如何影响十二指肠转录组和DNA甲基化谱。我们观察到在高饲料效率猪品系中过夜禁食猪和饲喂猪之间基因表达水平的数千个变化,但在相关的低饲料效率猪行中几乎没有。
    Feed efficiency is a trait of interest in pigs as it contributes to lowering the ecological and economical costs of pig production. A divergent genetic selection experiment from a Large White pig population was performed for 10 generations, leading to pig lines with relatively low- (LRFI) and high- (HRFI) residual feed intake (RFI). Feeding behavior and metabolic differences have been previously reported between the two lines. We hypothesized that part of these differences could be related to differential sensing and absorption of nutrients in the proximal intestine. We investigated the duodenum transcriptome and DNA methylation profiles comparing overnight fasting with ad libitum feeding in LRFI and HRFI pigs (n = 24). We identified 1,106 differentially expressed genes between the two lines, notably affecting pathways of the transmembrane transport activity and related to mitosis or chromosome separation. The LRFI line showed a greater transcriptomic response to feed intake than the HRFI line. Feed intake affected genes from both anabolic and catabolic pathways in the pig duodenum, such as rRNA production and autophagy. Several nutrient transporter and tight junction genes were differentially expressed between lines and/or by short-term feed intake. We also identified 409 differentially methylated regions in the duodenum mucosa between the two lines, while this epigenetic mark was less affected by feeding. Our findings highlighted that the genetic selection for feed efficiency in pigs changed the transcriptome profiles of the duodenum, and notably its response to feed intake, suggesting key roles for this proximal gut segment in mechanisms underlying feed efficiency.NEW & NOTEWORTHY The duodenum is a key organ for the hunger/satiety loop and nutrient sensing. We investigated how the duodenum transcriptome and DNA methylation profiles are affected by feed intakes in pigs. We observed thousands of changes in gene expression levels between overnight-fasted and fed pigs in high-feed efficiency pig lines, but almost none in the related low-feed efficiency pig line.
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  • 文章类型: Journal Article
    Haberlearhodopensis,一个复活的物种,是已知唯一能够在多种极端环境中生存的植物,包括干燥,冻结温度,和长期的黑暗。然而,对这些应力耐受性的分子机制研究甚少。这里,我们提出了一个高质量的Haberlea基因组,发现44,306个基因中的〜23.55%是孤儿。比较基因组学分析确定了89个显著扩展的基因家族,其中25个是Haberlea特有的。此外,我们证明,即使在长时间的完全黑暗中,哈伯利亚也能保留其复活潜力。经历干燥的植物的转录组分析,黑暗,低温揭示了这些应力的共同和特定足迹,和他们的组合。例如,蛋白质磷酸酶2C(PP2C)基因在所有胁迫组合中基本上被诱导,而植物铬相互作用因子1(PIF1)和生长反应因子4(GRF4)仅在黑暗中诱导。此外,733个功能未知的基因和三个编码Haberlea特异性转录因子的基因在压力组合时被特异性诱导/抑制,使它们成为未来功能研究的有吸引力的目标。该研究提供了对基因组结构的全面了解,并报道了这种复活物种的多胁迫耐受性机制的详细信息,这将有助于制定使作物能够在极端和多种非生物胁迫下生存的策略。
    Haberlea rhodopensis, a resurrection species, is the only plant known to be able to survive multiple extreme environments, including desiccation, freezing temperatures, and long-term darkness. However, the molecular mechanisms underlying tolerance to these stresses are poorly studied. Here, we present a high-quality genome of Haberlea and found that ~ 23.55% of the 44,306 genes are orphan. Comparative genomics analysis identified 89 significantly expanded gene families, of which 25 were specific to Haberlea. Moreover, we demonstrated that Haberlea preserves its resurrection potential even in prolonged complete darkness. Transcriptome profiling of plants subjected to desiccation, darkness, and low temperatures revealed both common and specific footprints of these stresses, and their combinations. For example, PROTEIN PHOSPHATASE 2C (PP2C) genes were substantially induced in all stress combinations, while PHYTOCHROME INTERACTING FACTOR 1 (PIF1) and GROWTH RESPONSE FACTOR 4 (GRF4) were induced only in darkness. Additionally, 733 genes with unknown functions and three genes encoding transcription factors specific to Haberlea were specifically induced/repressed upon combination of stresses, rendering them attractive targets for future functional studies. The study provides a comprehensive understanding of the genomic architecture and reports details of the mechanisms of multi-stress tolerance of this resurrection species that will aid in developing strategies that allow crops to survive extreme and multiple abiotic stresses.
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