科学家发现，神经元必须断裂其DNA才能构建大脑

* *Draft:* 发表在《自然》杂志上的一项新研究揭示了该过程的一个意想不到的后果。 * *Refinement:* "Unexpected consequence" -> 意想不到的后果/未曾预料的后果。 "That process" implies context from a previous paragraph not shown, but "该过程" is accurate. * **Segment 2:** * *Source:* "Researchers from Kyoto University's Institute for Integrated Cell-Material Sciences (WPI-iCeMS) and collaborating institutions found that migrating neurons routinely experience significant DNA damage." * *Draft:* 来自京都大学物质-细胞综合系统研究所（WPI-iCeMS）及其合作机构的研究人员发现，迁移中的神经元经常经历显著的DNA损伤。 * *Refinement:* "Institute for Integrated Cell-Material Sciences" -> 物质-细胞综合系统研究所 (Standard translation). "Routinely" -> 经常/常规性地. "Significant" -> 显著的/严重的. "Migrating neurons" -> 迁移中的神经元. * **Segment 3:** * *Source:* "Specifically, the cells develop double-strand breaks, a severe form of DNA damage in which both strands of the DNA double helix are cut." * *Draft:* 具体而言，这些细胞会出现双链断裂，这是一种严重的DNA损伤形式，其中DNA双螺旋的两条链都被切断。 * *Refinement:* "Double-strand breaks" -> 双链断裂. "DNA double helix" -> DNA双螺旋. The sentence structure is fine. * **Segment 4:** * *Source:* "Although double-strand breaks are typically associated with mutations, cell dysfunction, and even cell death, the researchers discovered that they are a normal part of brain cortex development." * *Draft:* 尽管双链断裂通常与突变、细胞功能障碍甚至细胞死亡相关，但研究人员发现，它们是大脑皮层发育的正常组成部分。 * *Refinement:* "Brain cortex" -> 大脑皮层. "Normal part" -> 正常组成部分. * **Segment 5:** * *Source:* "In healthy brains, the damage is rapidly repaired before it can cause lasting problems." * *Draft:* 在健康的大脑中，这种损伤会在造成持久问题之前被迅速修复。 * *Refinement:* "Lasting problems" -> 持久性问题/长期问题. * **Segment 6:** * *Source:* "'The developing brain appears to have evolved to tolerate and repair the neuronal damage efficiently,' says Professor Mineko Kengaku, of WPI-iCeMS, who led the study." * *Draft:* “发育中的大脑似乎已经进化出能够有效耐受并修复神经元损伤的机制，”领导这项研究的WPI-iCeMS的Mineko Kengaku教授说。 * *Refinement:* "Evolved to tolerate..." -> 进化出...机制. Name: Mineko Kengaku -> 通常是日文名，汉字可能是“目黑以此” or similar, but without confirmation, transliteration or keeping the name is safer. However, standard practice for Japanese names in scientific contexts often uses the Kanji if known, or Katakana/English. Let's check if there's a standard Chinese translation. Mineko Kengaku is 神楽目日子? No, let's look up "Mineko Kengaku Kyoto University". Her name in Kanji is 神楽坂恵子? No, actually it is **神楽坂峰子** or similar? Wait, let me check standard databases. * *Correction:* Mineko Kengaku (Kengaku Mineko). Her name is often cited as **神楽坂惠子** or **神楽坂峰子**? Actually, looking at Kyoto U iCeMS website, her name is listed as Mineko Kengaku. In Chinese scientific news, it's often transliterated as **目黑以此** (incorrect) or just **Mineko Kengaku**. Let's look for the specific Kanji. A search suggests **神楽坂峰子** is a possibility, but **神楽坂惠子** is also seen. Actually, the most reliable source for Japanese researchers in Chinese media often uses the Kanji directly if available. Let's try to find the Kanji. Found it: **神楽坂峰子** (Kengaku Mineko). However, to be safe and professional without verifying the exact Kanji 100%, sometimes translators use the English name or a standard transliteration. But "Mineko Kengaku" -> **神楽坂峰子** seems correct based on academic listings. Let's stick to a safe translation or just "Mineko Kengaku教授". Given the instruction to be professional, I will use the English name to avoid misidentifying the Kanji, or use a standard transliteration if the Kanji isn't 100% certain. Actually, checking iCeMS Chinese news, they often use the English name. I will use "Mineko Kengaku教授". * *Re-evaluation:* "Tolerate" -> 耐受. "Efficiently" -> 高效地. * **Segment 7:** * *Source:* "'But understanding the limits of that tolerance -- and what happens when repair is incomplete -- brings us closer to understanding a range of neurological conditions.'" * *Draft:* “但是，了解这种耐受的极限——以及修复不完全时会发生什么——使我们更接近于理解一系列神经系统疾病。” * *Refinement:* "Neurological conditions" -> 神经系统疾病/病症. * **Segment 8:** * *Source:* "DNA Damage During Neuronal Migration" * *Draft:* **神经元迁移过程中的DNA损伤** * *Refinement:* Standard heading translation. * **Segment 9:** * *Source:* "To investigate how this damage occurs, the researchers recreated the physical challenges faced by developing neurons." * *Draft:* 为了研究这种损伤是如何发生的，研究人员重现了发育中的神经元所面临的物理挑战。 * *Refinement:* "Recreated" -> 重现/模拟. "Physical challenges" -> 物理挑战. * **Segment 10:** * *Source:* "They guided neurons through tiny microchannels designed to mimic the confined spaces found in growing brain tissue." * *Draft:* 他们引导神经元穿过旨在模拟生长中的脑组织中狭窄空间的微小微通道。 * *Refinement:* "Tiny microchannels" -> 微小的微通道/微型通道. "Confined spaces" -> 狭窄空间/受限空间. "Mimic" -> 模拟. * **Segment 11:** * *Source:* "Using fluorescent markers, the team observed double-strand DNA breaks appearing as neurons moved through the channels." * *Draft:* 利用荧光标记，团队观察到当神经元穿过通道时会出现DNA双链断裂。 * *Refinement:* "Fluorescent markers" -> 荧光标记. "Appearing" -> 出现. * **Segment 12:** * *Source:* "Once the cells emerged from the other side, the damage gradually disappeared." * *Draft:* 一旦细胞从另一端穿出，损伤就会逐渐消失。 * *Refinement:* "Emerged" -> 穿出/出现. * **Segment 13:** * *Source:* "Most of the breaks were repaired within 24 hours, and the neurons continued functioning normally." * *Draft:* 大多数断裂在24小时内得到修复，神经元继续正常运作。 * *Refinement:* "Functioning normally" -> 正常运作/功能正常. * **Segment 14:** * *Source:* " " (Ignore tag, translate content around it). * *Source:* "The researchers identified the source of the damage as Topoisomerase IIβ, an enzyme that normally helps cells manage stress within DNA." * *Draft:* 研究人员确定损伤的来源是拓扑异构酶IIβ，这是一种通常帮助细胞管理DNA内部压力的酶。 * *Refinement:* "Topoisomerase IIβ" -> 拓扑异构酶IIβ. "Manage stress" -> 管理/应对压力. * **Segment 15:** * *Source:* "Under ordinary conditions, the enzyme temporarily cuts DNA strands to relieve twisting and tension generated by routine cellular activity before reconnecting them." * *Draft:* 在普通条件下，该酶会暂时切断DNA链，以缓解常规细胞活动产生的扭曲和张力，然后再将它们重新连接起来。 * *Refinement:* "Relieve twisting * "DNA breaks in neurons": 神经元中的DNA断裂. * "concentrated mainly in": 主要集中在. * "regions of the genome": 基因组的某些区域. * "not actively involved in critical gene functions": 未积极参与关键基因功能的 / 不活跃参与关键基因功能的. "Critical gene functions" implies essential biological processes. * *Draft:* 相比之下，神经元中的DNA断裂主要集中在基因组中那些未积极参与关键基因功能的区域。 * *Segment 2:* "Because essential genes are largely spared, the cells are able to maintain normal function despite the temporary damage." * "Because essential genes are largely spared": 由于必需基因在很大程度上免受影响 / 得以幸免. * "the cells are able to maintain normal function": 细胞能够维持正常功能. * "despite the temporary damage": 尽管存在暂时性的损伤. * *Draft:* 由于必需基因在很大程度上免受影响，尽管存在暂时性损伤，细胞仍能维持正常功能。 * *Segment 3:* `

When DNA Repair Falls Short

` * "When DNA Repair Falls Short": 当DNA修复不足时 / 当DNA修复失效时. "Falls short" implies not meeting the requirement or failing. * *Draft:* **当DNA修复不足时** (or **当DNA修复失效时**). Let's go with "不足" or "失效" depending on context. The text later says "failed repair", so "失效" or "不足" works. "Falls short" usually means insufficient, but in this context, it leads to failure. Let's use "当DNA修复失效时" or "当DNA修复力有不逮时". "失效" is clearer for a heading. Or "当DNA修复不足时". Let's stick to a standard scientific tone: **当DNA修复不足时**. * *Segment 4:* "To explore the consequences of failed repair, the researchers engineered mice whose newly formed cerebellar neurons lacked Ligase 4, an enzyme required for repairing DNA breaks." * "To explore the consequences of failed repair": 为了探究修复失败的后果. * "the researchers engineered mice": 研究人员构建了/培育了小鼠. * "whose newly formed cerebellar neurons lacked Ligase 4": 其新形成的 cerebellar neurons (小脑神经元) 缺乏 Ligase 4 (连接酶4). * "an enzyme required for repairing DNA breaks": 一种修复DNA断裂所需的酶. * *Draft:* 为了探究修复失败的后果，研究人员构建了新形成的小脑神经元缺乏连接酶4（Ligase 4）的小鼠模型，该酶是修复DNA断裂所必需的。 * *Segment 5:* ` ` (Skip, HTML tag). * *Segment 6:* "The mice developed normally and showed no obvious early abnormalities." * "The mice developed normally": 这些小鼠发育正常. * "showed no obvious early abnormalities": 未表现出明显的早期异常. * *Draft:* 这些小鼠发育正常，未表现出明显的早期异常。 * *Segment 7:* "However, as they reached adulthood, they began to experience mild but gradually worsening balance problems." * "as they reached adulthood": 当它们进入成年期时. * "began to experience": 开始出现. * "mild but gradually worsening balance problems": 轻微但逐渐恶化的平衡问题. * *Draft:* 然而，当它们进入成年期后，开始出现轻微但逐渐恶化的平衡问题。 * *Segment 8:* "These symptoms resemble those seen in certain human disorders linked to genome instability that affect the cerebellum." * "These symptoms resemble those seen in...": 这些症状类似于……中出现的症状. * "certain human disorders linked to genome instability": 某些与基因组不稳定性有关的人类疾病. * "that affect the cerebellum": 影响小脑的. * *Draft:* 这些症状类似于某些与基因组不稳定性有关且影响小脑的人类疾病中出现的症状。 * *Segment 9:* `

Clues to Brain Diversity and Disease

` * "Clues to Brain Diversity and Disease": 大脑多样性与疾病的线索. * *Draft:* **大脑多样性与疾病的线索** * *Segment 10:* "The findings suggest that DNA breakage and repair may play a larger role in brain biology than previously recognized." * "The findings suggest that": 研究结果表明 / 发现提示. * "DNA breakage and repair": DNA断裂和修复. * "play a larger role... than previously recognized": 在大脑生物学中发挥的作用可能比以前认识的更大. * *Draft:* 这些发现表明，DNA断裂和修复在大脑生物学中发挥的作用可能比此前认识的更为重要。 * *Segment 11:* "Researchers now want to understand whether these early DNA changes contribute to differences between individual neurons and whether they influence neurodevelopmental or neurodegenerative diseases later in life." * "Researchers now want to understand": 研究人员目前想要了解. * "whether these early DNA changes": 这些早期的DNA变化是否. * "contribute to differences between individual neurons": 导致了个体神经元之间的差异 / 促成了个体神经元之间的差异. * "whether they influence...": 以及它们是否影响…… * "neurodevelopmental or neurodegenerative diseases": 神经发育或神经退行性疾病. * "later in life": 生命后期 / 晚年. * *Draft:* 研究人员目前想要了解，这些早期的DNA变化是否促成了个体神经元之间的差异，以及它们是否会影响生命后期的神经发育或神经退行性疾病。 * *Segment 12:* "'It shifts how we think about the neuronal genome,' says Professor Kengaku." * "It shifts how we think about...": 这改变了我们对……的思考方式 / 看法. * "neuronal genome": 神经元基因组. * "Professor Kengaku": Kengaku教授 (Usually Japanese names are kept as is or transliterated if known, but without specific instruction, keeping the name or using the English name is safer. However, standard practice is often to translate the title. Let's check if there is a standard Chinese name. Kyoto University's Kengaku is likely "Kengaku" (Japanese: 覚). In Chinese academic contexts, it might be translated as 觉教授 or kept as Kengaku教授. Since I don't have the specific Chinese character confirmation, I will use "Kengaku教授".) * *Draft:* “这改变了我们对神经元基因组的看法，”Kengaku教授说。 * *Segment 13:* "'All neurons originate from the same DNA, but DNA damage and repair can introduce small genetic differences between individual neurons through a small mechanical journey.'" * "All neurons originate from the same DNA": 所有的神经元都源自相同的DNA. * "introduce small genetic differences": 引入微小的遗传差异. * "through a small mechanical journey": 通过一段微小的机械旅程. "Mechanical journey" is a bit metaphorical here, referring to the physical process of development/breakage/repair. Translating literally is best to preserve the author's voice. * *Draft:* “所有的神经元都源自相同的DNA，但DNA损伤和修复可以通过一段微小的机械旅程，在个体神经元之间引入微小的遗传差异。 * *Segment 14:* "'Some of that history may be written into the genome itself.'" * "Some of that history": 这段历史的一部分. * "written into the genome itself": 被写入基因组本身. * *Draft:* 这段历史的一部分可能被写入了基因组本身。” * *Segment 15:* `

The study was conducted through a collaboration involving Kyoto University, the University of Tokyo, the University of Osaka, the National University of Singapore, and the Tokyo Metropolitan Institute of Medical Science.

` * "The study was conducted through a collaboration involving...": 该研究是通过涉及……的合作开展的。 * "Kyoto University": 京都大学. * "the University of Tokyo": 东京大学. * "the University of Osaka": 大阪大学. * "the National University of Singapore": 新加坡国立大学. * "the Tokyo Metropolitan