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通过核酸救援效率对人类端粒长度的代谢约束

William Mannherz^1,2,3,4,5, Andrew Crompton^1,2,3,4, Noah Lampl^1,2,3

¹Division of Hematology/Oncology and Stem Cell Program, Boston Children's Hospital, Boston, MA, USA.

Nature communications

|March 28, 2025

概括

核酸救援途径双向控制人类端粒长度. 拯救脱氧氨酸 (dG) 抑制端粒酶,而其核酸转化激活端粒酶,为端粒细胞疾病提供治疗点.

科学领域:

分子生物学分子生物学
遗传学遗传学是一个
生物化学生物化学

背景情况:

人类端粒长度对细胞健康至关重要,并且受到严格监管.
端粒长度的失调与衰老和各种疾病有关,包括癌症和过早衰老综合征.
确定端粒长度边界的精确机制尚未完全理解.

研究的目的:

研究核酸救援途径在调节人类端粒长度中的作用.
确定影响端粒合成和端粒酶活性的特定代谢途径.
探索与端粒相关疾病的潜在治疗策略.

主要方法:

开发一种基于细胞的快速测定方法来测量端粒合成.
分析了脱氧氨酸 (dG) 和氨酸代谢对端粒酶活性的影响.
研究纯氨酸核酸酸酶 (PNP),素酸转移酶,脱氧丁酶和SAMHD1在端粒调节中的作用.
使用基因操纵 (表达Drosophila melanogaster脱氧核酸激酶) 和药理抑制 (ulodesine) 来调节救援途径.

主要成果:

核酸救援途径被发现可以双向地限制人类端粒长度.
对dG或guanosine转化为guanine核糖核酸的代谢强烈抑制了端粒酶并缩短了端粒.
将dG恢复到其核酸形式,由脱氧基丁激酶介导并由SAMHD1调节,强烈激活端粒酶.
通过表达异质激酶或抑制PNP来增强dG救援通路,导致人类细胞中强大的端粒延长,包括患有端粒疾病的患者.

结论:

端粒长度是通过可用的脱氧核酸三酸盐 (dNTP) 基质对端粒酶的活性和双向控制.
核酸挽救途径代表了端粒恒常的关键调节纽带.
调节这些救援通路为管理端粒长度和相关疾病提供了潜在的可操作的治疗方法.

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