Molecular genetics

分子遗传学
  • 文章类型: Journal Article
    人工智能(AI)平台已经成为遗传学和分子医学的关键工具。就像在许多其他领域一样。患者数据的增长,识别新的疾病和表型,发现新的细胞内途径,更多的组学数据集的可用性,以及不断分析它们的需求导致了新的AI平台的开发。AI继续将其融入遗传学结构中,有可能解锁新发现并增强患者护理。这项技术正在为各个领域的突破奠定基础,包括形态学,罕见的遗传性疾病,癌症,临床微生物,人畜共患疾病的调查,所有医学学科的组学研究。人工智能在促进对这些领域的更深入理解方面的作用预示着个性化医疗的新时代。治疗和诊断是根据个人的分子特征量身定制的,提供了一种更精确的方法来对抗遗传或获得性疾病。这些AI平台的重要性正在增长,因为它们在诊断和治疗过程中协助医疗保健专业人员。标志着向更知情的关键转变,高效,和有效的医疗实践。在这次审查中,我们将探索可用的AI工具的范围,并展示它们如何在支持临床决策的基因组研究的各个领域变得至关重要。
    Artificial intelligence (AI) platforms have emerged as pivotal tools in genetics and molecular medicine, as in many other fields. The growth in patient data, identification of new diseases and phenotypes, discovery of new intracellular pathways, availability of greater sets of omics data, and the need to continuously analyse them have led to the development of new AI platforms. AI continues to weave its way into the fabric of genetics with the potential to unlock new discoveries and enhance patient care. This technology is setting the stage for breakthroughs across various domains, including dysmorphology, rare hereditary diseases, cancers, clinical microbiomics, the investigation of zoonotic diseases, omics studies in all medical disciplines. AI\'s role in facilitating a deeper understanding of these areas heralds a new era of personalised medicine, where treatments and diagnoses are tailored to the individual\'s molecular features, offering a more precise approach to combating genetic or acquired disorders. The significance of these AI platforms is growing as they assist healthcare professionals in the diagnostic and treatment processes, marking a pivotal shift towards more informed, efficient, and effective medical practice. In this review, we will explore the range of AI tools available and show how they have become vital in various sectors of genomic research supporting clinical decisions.
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  • 文章类型: Journal Article
    背景:核蛋白1(NPM1)基因突变的急性髓性白血病(NPM1mutAML)被归类为预后良好的亚型。然而,一些患者在强化化疗后未能完全缓解或复发。伴随突变的遗传异常有助于NPM1mutAML患者的异质性预后。
    方法:在本研究中,纳入91例NPM1突变和FLT3-ITD野生型(NPM1mut/FLT3-ITDwt)中等风险核型AML患者,以分析常见遗传共突变对化疗结果的影响。
    结果:我们的数据显示TET1/2(52/91,57.1%)是NPM1mutAML患者中最普遍的共突变,其次是IDH1/2(36/91,39.6%),DNMT3A(35/91,38.5%),骨髓增生异常综合征相关基因(MDS相关基因)(ASXL1,BCOR,EZH2、RUNX1、SF3B1、SRSF2、STAG2、U2AF1和ZRSR2基因)(35/91,38.5%),FLT3-TKD(27/91,29.7%)和GATA2(13/91,14.3%)突变。TET1/2mut患者的无复发生存率(RFS)明显较差(中位数,28.7vs.未达到(NR)个月;p=0.0382)与TET1/2wt患者相比,而总生存期(OS)无显著差异(中位数,NRvs.NR;p=0.3035)。GATA2mut亚型与OS差相关(中位数,28vs.NR月;p<0.0010)和RFS(中位数,24vs.NR月;p=0.0224)与GATA2wt相比。通过多变量分析,GATA2mut和MDS相关基因mut与较差的生存率独立相关。
    结论:发现TET1/2,GATA2和MDS相关基因的突变显着影响NPM1mutAML患者的化疗结局。我们的研究结果对于识别对一线化疗有不良反应的患者具有重要的临床意义,并为NPM1mut/FLT3-ITDwtAML患者的进一步预后分层提供了新的参考。
    BACKGROUND: Nucleophosmin 1 (NPM1) gene-mutated acute myeloid leukemia (NPM1mut AML) is classified as a subtype with a favorable prognosis. However, some patients fail to achieve a complete remission or relapse after intensified chemotherapy. Genetic abnormalities in concomitant mutations contribute to heterogeneous prognosis of NPM1mut AML patients.
    METHODS: In this study, 91 NPM1-mutated and FLT3-ITD wild-type (NPM1mut/FLT3-ITDwt) AML patients with intermediate-risk karyotype were enrolled to analyze the impact of common genetic co-mutations on chemotherapeutic outcome.
    RESULTS: Our data revealed that TET1/2 (52/91, 57.1%) was the most prevalent co-mutation in NPM1mut AML patients, followed by IDH1/2 (36/91, 39.6%), DNMT3A (35/91, 38.5%), myelodysplastic syndrome related genes (MDS-related genes) (ASXL1, BCOR, EZH2, RUNX1, SF3B1, SRSF2, STAG2, U2AF1 and ZRSR2 genes) (35/91, 38.5%), FLT3-TKD (27/91, 29.7%) and GATA2 (13/91, 14.3%) mutations. Patients with TET1/2mut exhibited significantly worse relapse-free survival (RFS) (median, 28.7 vs. not reached (NR) months; p = 0.0382) compared to patients with TET1/2wt, while no significant difference was observed in overall survival (OS) (median, NR vs. NR; p = 0.3035). GATA2mut subtype was associated with inferior OS (median, 28 vs. NR months; p < 0.0010) and RFS (median, 24 vs. NR months; p = 0.0224) compared to GATA2wt. By multivariate analysis, GATA2mut and MDS-related genesmut were independently associated with worse survival.
    CONCLUSIONS: Mutations in TET1/2, GATA2 and MDS-related genes were found to significantly influence the chemotherapeutic outcome of patients with NPM1mut AML. The findings of our study have significant clinical implications for identifying patients who have an adverse response to frontline chemotherapy and provide a novel reference for further prognostic stratification of NPM1mut/FLT3-ITDwt AML patients.
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  • 文章类型: Editorial
    总之,这项研究对ACD-RCC中KMT2C和TSC2变体的研究标志着在理解这种独特的肾脏肿瘤方面取得了重大进展。通过阐明ACD-RCC的分子景观,这项研究为未来旨在揭示驱动肿瘤发展和进展的复杂机制的研究奠定了基础。这种理解最终可能导致对肾癌患者更有效的管理和治疗策略。
    In summary, the study\'s investigation of KMT2C and TSC2 variants in ACD-RCC marks a significant advancement in comprehending this distinct kidney tumor. By illuminating the molecular landscape of ACD-RCC, the research sets the stage for future studies aimed at revealing the complex mechanisms driving tumor development and progression. This understanding could eventually lead to more effective management and treatment strategies for renal cancer patients.
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  • 文章类型: Journal Article
    莱姆病,美国和欧洲主要的媒介传播疾病,感染伯氏疏螺旋体后发展。螺旋体从蜱载体到脊椎动物宿主的传播需要基因表达的整体变化,在某种程度上,通过Rrp2/RpoN/RpoS替代sigma因子级联。定义B.burgdorferiRpoS调节子的转录研究表明,RpoS激活了旁系家族52(PFam52)基因的转录。在菌株B31中,PFam52基因(bbi42,bbk53和bbq03)编码一组保守的假设蛋白质,其氨基酸同一性>89%,被预测为表面定位。旁系家族成员之间的广泛同源性使蛋白质对致病性的贡献研究变得复杂,因为功能冗余的潜力将混淆发现。使用顺序诱变方法,我们产生了表达单个PFam52旁系物的克隆,以及这三个菌株都缺乏。使用表达单个同源物的菌株来确认BBI42、BBK53和BBQ03表面定位和RpoS调节。令人惊讶的是,PFam52缺陷型菌株能够感染小鼠,并完成与野生型亲本菌株相似的植物学周期.的确,在PFam52基因中存在大量含有移码或内部终止密码子的假基因,这表明它们可能在伯氏芽孢杆菌减少的基因组中发生基因丢失。或者,缺乏表型可能反映了实验性小鼠感染模型的局限性。
    Lyme disease, the leading vector-borne disease in the United States and Europe, develops after infection with Borrelia burgdorferi sensu lato bacteria. Transmission of the spirochete from the tick vector to a vertebrate host requires global changes in gene expression that are controlled, in part, by the Rrp2/RpoN/RpoS alternative sigma factor cascade. Transcriptional studies defining the B. burgdorferi RpoS regulon have suggested that RpoS activates the transcription of paralogous family 52 (PFam52) genes. In strain B31, PFam52 genes (bbi42, bbk53, and bbq03) encode a set of conserved hypothetical proteins with >89% amino acid identity that are predicted to be surface-localized. Extensive homology among members of paralogous families complicates studies of protein contributions to pathogenicity as the potential for functional redundancy will obfuscate findings. Using a sequential mutagenesis approach, we generated clones expressing a single PFam52 paralog, as well as a strain deficient in all three. The single paralog expressing strains were used to confirm BBI42, BBK53, and BBQ03 surface localization and RpoS regulation. Surprisingly, the PFam52-deficient strain was able to infect mice and complete the enzootic cycle similar to the wild-type parental strain. Indeed, the presence of numerous pseudogenes that contain frameshifts or internal stop codons among the PFam52 genes suggests that they may be subjected to gene loss in B. burgdorferi\'s reduced genome. Alternatively, the lack of phenotype might reflect the limitations of the experimental mouse infection model.
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  • 文章类型: Journal Article
    我们以前已经开发了一种基于转录的细菌三杂交(B3H)测定法,作为一种遗传方法来探测大肠杆菌细胞内部的RNA-蛋白质相互作用。该系统提供了一条直接的途径来鉴定和评估具有感兴趣的分子表型的RBP中突变的后果。在B3H测定中检测RNA-蛋白质相互作用的一个限制因素是由与杂合RNA中的相邻RNA序列的不正确碱基对相互作用引起的RNA错误折叠。为了支持杂交诱饵RNA的正确折叠,我们已经探索了使用高度稳定的茎(“GC钳”)来分离杂合RNA的区域作为离散的折叠单元。在这项工作中,我们引入了新的诱饵RNA构建体,以1)用GC夹钳隔离杂交RNA的各个成分的折叠,以及2)表达不编码其自身固有终止子的诱饵RNA。我们发现在B3H测定中,短GC夹钳(5或7bp长)比长13bpGC夹钳更有效。这些新构建体增加了在B3H系统中可检测到的Hfq-sRNA和-5'UTR相互作用的数量,并改善了许多这些相互作用的信噪比。因此,我们建议使用包含短GC夹钳的构建体来表达未来的B3H诱饵RNA。有了这些新结构,在B3H分析中可以检测到更广泛的RNA-蛋白质相互作用,扩大这种遗传工具的效用和影响,作为搜索和询问额外RNA-蛋白质相互作用机制的平台。
    We have previously developed a transcription-based bacterial three-hybrid (B3H) assay as a genetic approach to probe RNA-protein interactions inside of E. coli cells. This system offers a straightforward path to identify and assess the consequences of mutations in RBPs with molecular phenotypes of interest. One limiting factor in detecting RNA-protein interactions in the B3H assay is RNA misfolding arising from incorrect base-pair interactions with neighboring RNA sequences in a hybrid RNA. To support correct folding of hybrid bait RNAs, we have explored the use of a highly stable stem (\"GC clamp\") to isolate regions of a hybrid RNA as discrete folding units. In this work, we introduce new bait RNA constructs to 1) insulate the folding of individual components of the hybrid RNA with GC clamps and 2) express bait RNAs that do not encode their own intrinsic terminator. We find that short GC clamps (5 or 7 bp long) are more effective than a longer 13bp GC clamp in the B3H assay. These new constructs increase the number of Hfq-sRNA and -5\'UTR interactions that are detectable in the B3H system and improve the signal-to-noise ratio of many of these interactions. We therefore recommend the use of constructs containing short GC clamps for the expression of future B3H bait RNAs. With these new constructs, a broader range of RNA-protein interactions are detectable in the B3H assay, expanding the utility and impact of this genetic tool as a platform to search for and interrogate mechanisms of additional RNA-protein interactions.
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  • 文章类型: Editorial
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  • 文章类型: Journal Article
    同源重组由DNA双链断裂(DSB)的溶核降解(切除)引发。DSB切除是一个两步过程。在短程步骤中,MRX(Mre11-Rad50-Xrs2)复合物,与Sae2一起,在DSB末端切割5'-终止链,并向DNA末端切除。然后,远程切除核酸酶Exo1和Dna2进一步延长了切除的DNA束。我们发现降低蛋白酶体功能的突变绕过了DSB切除中对Sae2的需要。特别是,蛋白酶体亚基Rpn11的功能障碍导致过度切除,并增加Exo1和Dna2的水平,以至于可以绕过Exo1或Dna2的需求,但不能同时满足两者的需求。这些观察,随着Exo1和Dna2被泛素化的发现,表明蛋白酶体在通过负控制远程切除核酸酶的丰度来抑制DSB切除中的作用。
    Homologous recombination is initiated by the nucleolytic degradation (resection) of DNA double-strand breaks (DSBs). DSB resection is a two-step process. In the short-range step, the MRX (Mre11-Rad50-Xrs2) complex, together with Sae2, incises the 5\'-terminated strand at the DSB end and resects back toward the DNA end. Then, the long-range resection nucleases Exo1 and Dna2 further elongate the resected DNA tracts. We found that mutations lowering proteasome functionality bypass the need for Sae2 in DSB resection. In particular, the dysfunction of the proteasome subunit Rpn11 leads to hyper-resection and increases the levels of both Exo1 and Dna2 to such an extent that it allows the bypass of the requirement for either Exo1 or Dna2, but not for both. These observations, along with the finding that Exo1 and Dna2 are ubiquitylated, indicate a role of the proteasome in restraining DSB resection by negatively controlling the abundance of the long-range resection nucleases.
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  • 文章类型: Journal Article
    肠系膜和网膜脂肪组织(MOAT)通过生物活性分子的分泌直接与心脏通信,并通过传入信号传导到中枢神经系统间接地与心脏通信。心肌梗死(MI)可能导致MOAT的病理改变,这进一步影响心脏功能。我们的研究表明,MI诱导与信号转导相关的基因发生显著的MOAT转录变化,包括脂联素(APN),神经肽Y(NPY),和补码C3(C3),潜在影响传入活动。我们进一步发现,MOAT感觉神经神经与辣椒素(CAP)预防心脏重塑,改善心脏功能,并逆转MI组的心脏交感神经过度激活,伴有血清去甲肾上腺素降低。此外,CAP逆转了MI后升高的MOAT传入输入和脑心交感神经流出,增加APN和NPY,降低C3和血清促炎因子。这些结果表明,MOAT传入感觉神经的阻断通过抑制脑-心脏交感神经轴来发挥心脏保护作用。
    Mesenteric and omental adipose tissue (MOAT) communicates directly with the heart through the secretion of bioactive molecules and indirectly through afferent signaling to the central nervous system. Myocardial infarction (MI) may induce pathological alterations in MOAT, which further affects cardiac function. Our study revealed that MI induced significant MOAT transcriptional changes in genes related with signal transduction, including adiponectin (APN), neuropeptide Y (NPY), and complement C3 (C3), potentially influencing afferent activity. We further found that MOAT sensory nerve denervation with capsaicin (CAP) prevented cardiac remodeling, improved cardiac function, and reversed cardiac sympathetic nerve hyperactivation in the MI group, accompanied by reduced serum norepinephrine. In addition, CAP reversed the elevated MOAT afferent input and brain-heart sympathetic outflow post-MI, increasing APN and NPY and decreasing C3 and serum proinflammatory factors. These results demonstrated that blockade of the MOAT afferent sensory nerve exerts a cardioprotective effect by inhibiting the brain-heart sympathetic axis.
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  • 文章类型: Journal Article
    近四倍体/四倍体(NT/T)是急性髓性白血病(AML)的细胞遗传学改变。在AML中,特定的染色体改变与临床相关,形态学,和免疫表型特征。细胞遗传学对AML预后的影响已得到证实。然而,NT/T对AML的预后意义尚不清楚.我们的目的是进一步表征临床,形态学,免疫表型,分子突变,和NT/TAML的预后特征。这项对NT/TAML病例的回顾性分析显示,NT/TAML在老年男性中更为常见,主要是大母细胞和骨髓增生异常相关的特征。在77.8%的病例中,最常见的发育不良谱系是粒细胞生成异常。病例显示多种细胞遗传学异常,只有四个显示NT/T作为唯一的异常。TP53是与NT/TAML相关的最常见的分子突变(44.5%)。在接受NT/TAML治疗的患者中,80%取得了CR。整个队列的中位总生存期为4.5个月。
    Near-tetraploidy/tetraploidy (NT/T) is a cytogenetic alteration in acute myeloid leukemia (AML). In AML, specific chromosomal alterations are associated with clinical, morphological, and immunophenotypic features. The impact of cytogenetics on the prognosis of AML is well established. However, the prognostic implication of NT/T on AML remains unclear. Our aim is to further characterize the clinical, morphologic, immunophenotypic, molecular mutational, and prognostic features of NT/T AML. This retrospective chart review of NT/T AML cases showed NT/T AML was more common in older adult males, with predominately large blasts and myelodysplasia-related features. The most common lineage of dysplasia was dysgranulopoiesis in 77.8% of cases. Cases displayed multiple cytogenetic abnormalities, with only four showing NT/T as the sole abnormality. TP53 was the most common molecular mutation associated with NT/T AML (44.5%). Of the patients receiving treatment for NT/T AML, 80% achieved a CR. The median overall survival for the entire cohort was 4.5 months.
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  • 文章类型: Editorial
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