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Rewinding the clock: mechanisms of dedifferentiation 时钟倒转:去分化机制
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-30 DOI: 10.1016/j.gde.2025.102353
Amelie A Raz , Yukiko M Yamashita
Adult stem cells maintain tissue homeostasis through the production of differentiating cells. Considerable recent work has identified that stem cells themselves are replaceable through the process of dedifferentiation. The capacity and mechanisms of dedifferentiation vary widely among species and organ contexts. However, some core features are commonly present. In this review, we summarize ‘hallmarks’ of dedifferentiation, including mechanisms for maintenance of potency, sensation of loss, and migration, and review the current understanding of dedifferentiation as a true replacement mechanism.
成体干细胞通过产生分化细胞维持组织稳态。最近的大量研究表明,干细胞本身是可以通过去分化过程被替代的。去分化的能力和机制在不同的物种和器官环境中差异很大。然而,一些核心特性通常是存在的。在这篇综述中,我们总结了去分化的“特征”,包括维持效力、丧失感觉和迁移的机制,并回顾了目前对去分化作为一种真正的替代机制的理解。
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引用次数: 0
Unlocking regeneration: how partial reprogramming resembles tissue healing 解锁再生:部分重编程如何类似于组织愈合
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-30 DOI: 10.1016/j.gde.2025.102351
Melissa T Adams, Heinrich Jasper, Lluc Mosteiro
Partial reprogramming achieved by the transient expression of the transcription factors (TFs) Oct4, Sox2, Klf4 and C-Myc (abbreviated OSKM) can erase aging and damage features in cells, leading to increased healthspan, lifespan and tissue regeneration. Recent reports suggest that the mechanisms of partial reprogramming may share some similarities with natural dedifferentiation and regeneration. Both processes appear to involve the transient repression of somatic identity through the sequestration of somatic identity TFs to noncanonical sites, which are opened by the high expression of pioneer TFs, leading to transient dedifferentiation into a fetal-like state. Here, we review the reported benefits of partial reprogramming on tissue regeneration and propose a common mechanism of epigenetic remodeling with natural regeneration after tissue injury.
通过转录因子Oct4、Sox2、Klf4和C-Myc(简称OSKM)的瞬时表达实现部分重编程,可以消除细胞中的衰老和损伤特征,从而延长健康寿命、寿命和组织再生。最近的报道表明,部分重编程的机制可能与自然去分化和再生有一些相似之处。这两个过程似乎都涉及体细胞身份的短暂抑制,通过将体细胞身份tf隔离到非规范位点,这是由先驱tf的高表达打开的,导致短暂的去分化进入胎儿状态。在此,我们回顾了部分重编程对组织再生的益处,并提出了组织损伤后表观遗传重塑与自然再生的共同机制。
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引用次数: 0
The hidden costs of imperfection: transcription errors in protein aggregation diseases 不完美的隐性代价:蛋白质聚集性疾病中的转录错误
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-29 DOI: 10.1016/j.gde.2025.102350
Yingwo Sun, Marc Vermulst
At first glance, biological systems appear to operate with remarkable precision and order. Yet, closer examination reveals that this perfection is an illusion, biological processes are inherently prone to errors. Here, we describe recent evidence that indicates that errors that occur during transcription play an important role in neurological diseases. These errors, though transient, can have lasting consequences when they generate mutant proteins with amyloid or prion-like properties. Such proteins can seed aggregation cascades, converting wild-type counterparts into misfolded conformations, ultimately leading to toxic deposits seen in diseases like Alzheimer’s and amyotrophic lateral sclerosis. These observations help to paint a fuller picture of the origins of neurodegenerative diseases in aging humans and suggest a unified mechanism by which they may arise.
乍一看,生物系统的运作似乎非常精确和有序。然而,更仔细的研究表明,这种完美是一种错觉,生物过程天生就容易出错。在这里,我们描述了最近的证据,表明转录过程中发生的错误在神经系统疾病中起着重要作用。这些错误虽然是短暂的,但当它们产生具有淀粉样蛋白或朊病毒样特性的突变蛋白时,可能会产生持久的后果。这些蛋白质可以引发聚集级联反应,将野生型的对应物转化为错误折叠的构象,最终导致阿尔茨海默氏症和肌萎缩性侧索硬化症等疾病的毒性沉积。这些观察结果有助于更全面地描绘出老年人类神经退行性疾病的起源,并提出了它们可能产生的统一机制。
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引用次数: 0
Paternal effects on telomere integrity during the sperm-to-embryo transition 精子到胚胎转变过程中,父系对端粒完整性的影响
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-25 DOI: 10.1016/j.gde.2025.102348
Sung-Ya Lin , Mia T Levine
Telomeres are essential nucleoprotein structures that preserve our terminal DNA sequence and protect chromosome ends from fusion. Our vast knowledge of telomeres comes almost entirely from studies of healthy and diseased somatic cells. However, building evidence suggests that the molecules and mechanisms required for telomere integrity in somatic cells are insufficient to preserve telomere integrity during the sperm-to-embryo transition. Here, we review this growing body of work on telomere ‘paternal effects’, wherein zygotic telomere integrity is determined not by the genotype of the zygote but instead by the genotype of the father. Direct inheritance of sperm-specific proteins establishes paternal telomere epigenetic identity, while direct inheritance of sperm telomere length contributes to telomere length inheritance. Together, these investigations of telomere integrity through the sperm-to-embryo transition reveal potent paternal effects on zygotic telomere functions, with implications for human infertility.
端粒是保存我们的末端DNA序列和保护染色体末端免于融合的基本核蛋白结构。我们对端粒的大量知识几乎完全来自对健康和患病体细胞的研究。然而,越来越多的证据表明,体细胞端粒完整性所需的分子和机制不足以在精子到胚胎的转变过程中保持端粒完整性。在这里,我们回顾了不断增长的端粒“父系效应”研究,其中合子端粒的完整性不是由合子的基因型决定的,而是由父亲的基因型决定的。精子特异性蛋白的直接遗传建立了父本端粒表观遗传身份,而精子端粒长度的直接遗传有助于端粒长度遗传。总之,这些通过精子到胚胎转变的端粒完整性的研究揭示了父亲对合子端粒功能的强大影响,对人类不育具有启示意义。
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引用次数: 0
From conservation to adaptation: understanding the synaptonemal complex’s evolutionary dynamics 从保守到适应:理解突触复合体的进化动力学
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-16 DOI: 10.1016/j.gde.2025.102349
Stefanie Williams, Robin Scott Hawley
The synaptonemal complex (SC) is structurally conserved across eukaryotes and is essential for a proper progression of meiosis. Despite this conservation, SC protein sequences diverge drastically. In this review, we explore findings on SC protein evolution, highlighting key differences and commonalities among lineages like the Caenorhabditis and the Drosophila genera. We further explore known cases where the SC and its proteins adopt novel functional roles and discuss why knowledge of these cases could be important for the study of canonical SC biology. The existing studies demonstrate that work on the evolutionary biology of SC proteins and functional studies in more diverse meiotic research organisms should play a major role in aiding our understanding of SC structure and functions.
突触复合体(SC)在真核生物中是结构保守的,对减数分裂的正常进行至关重要。尽管有这种保守性,SC蛋白序列却有很大的差异。在这篇综述中,我们探讨了SC蛋白进化的发现,突出了像隐杆线虫和果蝇属这样的谱系之间的关键差异和共同点。我们进一步探讨了已知的SC及其蛋白发挥新功能作用的案例,并讨论了为什么了解这些案例对规范SC生物学的研究很重要。现有的研究表明,SC蛋白的进化生物学研究和在更多样化的减数分裂研究生物中的功能研究应该在帮助我们理解SC结构和功能方面发挥重要作用。
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引用次数: 0
Remodeling, compartmentalization, and degradation: a trifecta for organelle quality control during gametogenesis 重塑、分隔和降解:配子发生过程中细胞器质量控制的三部曲
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-14 DOI: 10.1016/j.gde.2025.102347
Tianyao Xiao, Elçin Ünal
The key to healthy offspring production lies in the accurate inheritance of components from progenitor germ cells during gametogenesis. Along with genetic material, precise regulation of organelle inheritance is vital for gamete health and embryonic development, especially in aged organisms, where organelle function declines and damage accumulates. In these cases, removing age-related organellar defects in precursor cells is crucial for successful reproduction. The single-celled organism Saccharomyces cerevisiae shares striking similarities with more complex organisms: like metazoan cells, yeast accumulate organelle damage with age, yet can still produce damage-free gametes with a reset lifespan. Recent studies show that organelles undergo significant reorganization during yeast gametogenesis, and similar remodeling occurs in metazoans, suggesting common strategies for maintaining gamete quality. This review summarizes organellar reorganization during gametogenesis in yeast and how it aids in clearing age-related cellular damage. We also explore organellar remodeling in multicellular organisms and discuss the potential mechanisms and biological benefits of meiotic organellar reshaping.
在配子发生过程中,健康后代的关键在于祖先生殖细胞成分的准确遗传。与遗传物质一样,精确调节细胞器遗传对配子健康和胚胎发育至关重要,特别是在衰老生物体中,细胞器功能下降和损伤积累。在这些情况下,去除前体细胞中与年龄相关的细胞器缺陷对成功繁殖至关重要。单细胞生物酿酒酵母与更复杂的生物有着惊人的相似之处:像后生细胞一样,酵母随着年龄的增长而积累细胞器损伤,但仍然可以产生无损伤的配子,并具有重置寿命。最近的研究表明,在酵母配子发生过程中,细胞器经历了重大的重组,在后生动物中也发生了类似的重塑,这表明维持配子质量的共同策略。本文综述了酵母配子体发生过程中的细胞器重组及其如何帮助清除与年龄相关的细胞损伤。我们还探讨了多细胞生物的细胞器重塑,并讨论了减数分裂细胞器重塑的潜在机制和生物学效益。
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引用次数: 0
No more nonsense: evaluating poison exons as therapeutic targets in neurodevelopmental disorders 没有更多的废话:评估毒性外显子作为神经发育障碍的治疗靶点
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-09 DOI: 10.1016/j.gde.2025.102346
Shreeya Bakshi, Lori L Isom
Alternative splicing of pre-mRNA generates multiple transcripts from a single gene, contributing to transcriptomic diversity. Alternative splicing can result in inclusion of poison exons (PEs), which contain a premature stop codons (PTC) that target transcripts for nonsense-mediated decay (NMD). PE-containing transcripts are prevalent in the brain, where they can play roles in fine-tuning mRNA and protein levels. Antisense, or splice-switching, oligonucleotides (ASOs/SSOs) are used to target PEs to reduce their inclusion and treat neurodevelopmental disorders. ASOs/SSOs address the genetic causes of disease and are precision therapies that can provide a cure rather than only address disease symptoms. This review explores the role of PEs in the brain, therapeutic targeting of PEs, and current challenges in our understanding of PEs.
前mrna的选择性剪接产生来自单个基因的多个转录本,有助于转录组多样性。选择性剪接可导致毒性外显子(PEs)的包含,其包含一个针对无义介导衰变(NMD)转录本的过早停止密码子(PTC)。含有pe的转录本在大脑中普遍存在,它们可以在微调mRNA和蛋白质水平方面发挥作用。反义或剪接开关寡核苷酸(ASOs/SSOs)用于靶向pe以减少其包涵并治疗神经发育障碍。aso / sso解决了疾病的遗传原因,是一种精确的治疗方法,可以治愈疾病,而不仅仅是解决疾病症状。这篇综述探讨了pe在脑中的作用,pe的治疗靶向,以及目前我们对pe的理解面临的挑战。
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引用次数: 0
R-loops in neurodegeneration 神经变性中的 R 环
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-08 DOI: 10.1016/j.gde.2025.102345
Chiara Beghѐ, Helena Harpham, Yasmine Barberic, Natalia Gromak
Neurodegenerative diseases are associated with the progressive loss of neurons. R-loops are non-canonical nucleic acid structures formed during transcription and composed of an RNA/DNA hybrid and a displaced single-stranded DNA. Whilst R-loops are important regulators of cellular processes, they are also associated with the pathologies of multiple disorders, including repeat expansion, motor neuron, inflammatory and ageing diseases. In this review, we discuss how R-loops contribute to pathological mechanisms that underpin neurodegeneration. We highlight the role of R-loops in several hallmarks of neurodegenerative disorders, including RNA and DNA defects, DNA damage, protein aggregation, inflammation, mitochondrial dysfunction, and neuronal cell death. We also discuss the potential role of R-loops as therapeutic targets for neurodegenerative disorders.
神经退行性疾病与神经元的逐渐丧失有关。r环是转录过程中形成的非规范核酸结构,由RNA/DNA杂交和移位的单链DNA组成。虽然r环是细胞过程的重要调节因子,但它们也与多种疾病的病理有关,包括重复扩张、运动神经元、炎症和衰老疾病。在这篇综述中,我们讨论了r环如何促进神经退行性变的病理机制。我们强调了r环在神经退行性疾病的几个标志中的作用,包括RNA和DNA缺陷、DNA损伤、蛋白质聚集、炎症、线粒体功能障碍和神经元细胞死亡。我们还讨论了r环作为神经退行性疾病治疗靶点的潜在作用。
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引用次数: 0
Reshaping transcription and translation dynamics during the awakening of the zygotic genome 在合子基因组觉醒期间重塑转录和翻译动力学
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-04-05 DOI: 10.1016/j.gde.2025.102344
Louise Maillard , Pierre Bensidoun , Mounia Lagha
During the oocyte-to-embryo transition, the transcriptome and proteome are dramatically reshaped. This transition entails a shift from maternally inherited mRNAs to newly synthesized transcripts, produced during the zygotic genome activation (ZGA). Furthermore, a crucial transcription and translation selectivity is required for early embryonic development. Studies across various model organisms have revealed conserved cis- and trans-regulatory mechanisms dictating the regimes by which mRNA and proteins are produced during this critical phase. In this article, we highlight recent technological and conceptual advances that deepen our understanding of how the tuning of both transcription and translation evolves during ZGA.
在卵母细胞向胚胎转变的过程中,转录组和蛋白质组发生了戏剧性的重塑。这种转变需要从母系遗传mrna到在合子基因组激活(ZGA)期间产生的新合成转录物的转变。此外,早期胚胎发育需要关键的转录和翻译选择性。对各种模式生物的研究揭示了保守的顺式和反式调节机制,这些机制决定了mRNA和蛋白质在这一关键阶段产生的机制。在本文中,我们强调了最近的技术和概念上的进步,这些进步加深了我们对ZGA期间转录和翻译的调整如何演变的理解。
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引用次数: 0
To splice or not to splice: pseudoexons in neurological disease and opportunities for intervention 剪接或不剪接:神经系统疾病中的假外显子及其干预机会
IF 3.7 2区 生物学 Q2 CELL BIOLOGY Pub Date : 2025-03-29 DOI: 10.1016/j.gde.2025.102343
Sue Fletcher , Niall P Keegan , Rita Mejzini , Ianthe L Pitout
Accurate exon selection and processing of pre-messenger RNA are crucial for normal gene expression. Mutations that alter splicing disrupt pre-mRNA processing and can have diverse effects on transcript structure, making the consequences of many such mutations difficult to predict. While next-generation sequencing technologies have transformed genetic diagnosis for many patients, deep intronic variants generally evade detection and characterisation. Of all the known types of splicing mutations, the most elusive to predict are those that activate pseudoexons. Because transcripts that contain pseudoexons are otherwise generally intact, exclusion (or ‘skipping’) of the pseudoexon during processing of the pre-mRNA is likely to generate a normal, functional mRNA. Characterisation of pseudoexon mutations will open opportunities for the development of antisense oligonucleotide strategies to overcome these disease-causing mutations.
准确的外显子选择和前信使RNA的加工对正常基因表达至关重要。改变剪接的突变会破坏前mrna的加工,并可能对转录本结构产生不同的影响,使得许多此类突变的后果难以预测。虽然下一代测序技术已经改变了许多患者的遗传诊断,但深层内含子变异通常逃避检测和表征。在所有已知的剪接突变类型中,最难以预测的是那些激活假外显子的剪接突变。由于含有假外显子的转录本通常是完整的,因此在预处理前mRNA过程中排除(或“跳过”)假外显子可能会产生正常的、功能性的mRNA。伪外显子突变的特征将为开发反义寡核苷酸策略来克服这些致病突变提供机会。
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引用次数: 0
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Current Opinion in Genetics & Development
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