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一种新发现的微生物暂被命名为“Sukunaarchaeum”。虽然它并非病毒,但和病毒一样,除了自我复制外几乎无法进行其他生命活动。

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一种新发现的微生物暂被命名为“Sukunaarchaeum”。虽然它并非病毒,但和病毒一样,除了自我复制外几乎无法进行其他生命活动。

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(图片来源:筑波大学)

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基因组极小的微生物或将进化为病毒
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ChristieWilcox
科技导报 | 科技新闻 2025,43(13): 13-14
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科技导报 |科技新闻 2025 , 43 (13) : 13 -14
基因组极小的微生物或将进化为病毒
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ChristieWilcox
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出版时间: 2025-07-13
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一种新发现的微生物暂被命名为“Sukunaarchaeum”。虽然它并非病毒,但和病毒一样,除了自我复制外几乎无法进行其他生命活动。

一种新发现的微生物暂被命名为“Sukunaarchaeum”。虽然它并非病毒,但和病毒一样,除了自我复制外几乎无法进行其他生命活动。

ChristieWilcox. 基因组极小的微生物或将进化为病毒. 科技导报, 2025 , 43 (13) : 13 -14 .
Wilcox Christie. Science & Technology Review, 2025 , 43 (13) : 13 -14 .
新发现的生物体DNA几乎完全专注于复制,模糊了细胞与病毒之间的界限
一种新发现的微生物暂被命名为“Sukunaarchaeum”。虽然它并非病毒,但和病毒一样,除了自我复制外几乎无法进行其他生命活动。
据科学家进行的基因组(目前唯一能证明其存在的证据)分析,这种生物是一种寄生生物,对其寄居的单细胞宿主毫无贡献。Sukunaarchaeum仅含189个蛋白质编码基因,大部分都用于复制自己的基因组;其他必需物质则完全依赖宿主,即广泛分布于全球海洋生态系统中的腰鞭毛虫。更神秘的是,它的部分序列显示它属于古菌谱系——与包括人类在内的复杂生物关系更近,而非与细菌(如大肠杆菌)同类。
一项发表在bioRxiv预印本平台的研究指出,Sukunaarchae‐um这种在生存方式上类似病毒的微生物“挑战了细胞生命与病毒之间的界限”。尽管并未参与该项研究,但明尼苏达大学双城分校的合成生物学家Kate Ada‐mala表示:“这种生物可能是一块令人着迷的活化石,即进化长河中侥幸留存的中间形态”。
Sukunaarchaeum的发现纯属偶然。日本筑波大学研究人员最初想测序C. regius细胞中的全部DNA,以研究其蓝藻共生体。除预期的甲藻和蓝藻序列以及疑似细菌寄生基因组外,他们意外发现一段仅238 kb的环状DNA,相当于大肠杆菌基因组大小的5%。筑波大学进化微生物学家TakuroNakayama表示:“起初我们怀疑这一微小的环状基因组可能只是某种实验中的产物”。
尽管Nakayama研究团队采用多种方法对该生物的基因组进行测序和组装,仍反复检测到该DNA环的存在。研究团队进而推断,C. regius体内可能共生着另一种生命体,其似乎属于古菌。
Sukunaarchaeum显然无法在宿主之外独立生存,其基因组规模约为目前已知最小古菌基因组的一半。该尚未正式命名的生物不同于任何已知古菌,其暂命名灵感来源于日本神话中身材矮小的神“Sukunabikona”。然而,Su‐kunaarchaeum并非已知拥有最小微生物基因组的记录保持者,目前该记录由一种共生于吸汁昆虫体内的细菌保持,其基因组仅含约16万个碱基对,并保留有可合成对宿主有益分子的相关基因。
Nakayama指出,相比之下,Sukunaarchaeum“几乎完全缺乏已知的代谢途径”。这意味着其可能无法自主合成基本的生命所需分子(如构成蛋白质的氨基酸或构成DNA的核苷酸),因此该微生物与宿主腰鞭毛虫之间可能存在一种“寄生性或单向依赖性关系”。Nakayama进一步补充道,Sukunaarchaeum“几乎完全依赖”于宿主的细胞机制,这一特性在已知病毒中尤为典型。
然而,Sukunaarchaeum在一个关键方面与病毒存在显著差异:具备自主复制其遗传物质的能力。通常,病毒必须依赖宿主细胞的分子机制完成自我复制,而几乎所有已鉴定的Sukunaar‐chaeum基因均与DNA复制、转录和翻译相关。尽管如此,Nakaya‐ma认为,该微生物“即便以牺牲几乎所有代谢能力为代价,仍极端专注于基因复制”的策略,与病毒的生存策略具有高度相似性。
圣地亚哥州立大学生物学家Elizabeth Waters曾参与2003年首个古菌寄生种类基因组的发表工作,她对Sukunaarchaeum正在进化为病毒的观点持谨慎态度,并表示,“这种推测尚嫌过早,不过如果这个假设成立,无疑将是一个令人震撼的发现”。无论如何,她认为这种微生物“极具研究价值”,并认为Sukunaarchaeum将为基因组进化的基础研究工作提供了理想的测试对象。
此外,Adamala补充指出,如果Sukunaarchaeum确实代表一种向病毒进化的微生物,那么该生物有可能为揭示病毒起源和演化路径提供关键线索。她指出,“生命进化过程中的许多重大转变并未留下化石证据,使得我们难以还原其具体发生机制。但通过研究现存生物的分子特征,我们可尝试重建其祖先状态。某些情况下,大自然还会保留进化中的过渡性形态,这无疑是极为宝贵的研究资源。”
目前已有证据表明,Suku‐naarchaeum并非孤例。Nakayama及其研究团队筛选从全球海水提取的公开DNA序列时,发现了许多与Sukunaarchaeum相似的序列。Nakayama表示,“这一发现使我们意识到,除了识别出一种异常的生物体,我们还首次揭示了一个此前未曾认识的大型古菌谱系的完整基因组。”
研究人员正试图拍摄Suku‐naarchaeum的图像,这项任务颇具挑战性,因为该微生物的宽度可能远小于1 μm(相比之下,Wa‐ters研究的古菌寄生生物基因组大小是Sukunaarchaeum的2倍多,然而其直径仅为400 nm)。此外,该团队正在研究该种微生物的谱系与其他古菌的关系,例如是否存在自由生活的近缘种,并对其蛋白质功能进行详细分析,特别是那些与细胞膜相关的巨大蛋白质,这些蛋白质可能在微生物与宿主之间的相互作用中起着关键作用。
Adamala认为这一发现能够提醒人们,生物学领域仍有许多未知领域值得探索。她表示,“这项研究充分展示了生物学的令人激动与迷人之处,同时也彰显了我们对其理解非常有限”。
(译自《Science》,2025,388(6753))

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  • 首发时间:2025-12-16
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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