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13/Q1 南京医科大学 AI + 多组学解码胎儿发育,破解 m5C 表观调控密码

  • 2026-06-02 09:47:43
13/Q1 南京医科大学 AI + 多组学解码胎儿发育,破解 m5C 表观调控密码

前言

胎儿发育表观调控一直是科研热点与难点,RNA m5C 甲基化的组织特异性机制更是迷雾重重!南京医科大学团队强强联合,以 AI 赋能多组学生信分析,整合 m5C-Seq、ATAC-Seq 等前沿技术,全景绘制人胎儿组织 m5C 甲基化图谱。突破性挖掘 Nsun2/Jarid2/Alyref 核心调控轴,破解 m5C 介导的 RNA - 组蛋白互作密码,为发育障碍诊疗提供全新靶点,成果硬核、价值拉满!

在学习优秀科研成果的同时,也要专注自己的课题。科研路上要是遇到难题都可以来咨询~我们团队能提供思路设计、生信分析、课题设计和标书评估等服务,助力你的科研之路!

文献解读

英文标题:RNA-m5C regulatory atlas of human fetal tissues uncover the activities of Nsun2/Jarid2/Alyref axis

文标题:人类胎儿组织的RNA-m5C调控图谱揭示了Nsun2/Jarid2/Alyref轴的活性

发表时间:2026.3

发表期刊:Journal of Advanced Research 

      研究背景      

RNA m5C 甲基化是胎儿发育关键表观调控,但其在人胎儿组织的分布与机制尚不明确。本研究聚焦胎儿发育核心的脑等组织,整合多组学技术,绘制人胎儿组织 m5C 全景图谱,解析 Nsun2/Jarid2/Alyref 调控轴介导的 RNA 甲基化 - 组蛋白修饰互作机制,为发育障碍诊疗提供新视角与靶点。

研究方法

1.样本与测序:收集孕 9-12 周人胎儿 7 种组织(脑、心、肝等),开展 m5C-Seq、RNA-Seq,构建组织特异性 m5C 图谱;对比胎儿与成人组织 m5C 动态差异。

2.动物模型:构建 Nsun2 条件敲除(Nsun2 cKO)、Nsun5 敲除(Nsun5 KO)小鼠,探究 m5C 酶功能。

3.分子与多组学:采用 Dot blot、Western Blot、Co-IP、免疫荧光;结合 CUT&Tag、ATAC-Seq,分析组蛋白修饰(H3K27me3)与染色质开放状态;生信分析 GO/KEGG 通路、可变剪接。

研究结果

 1.人胎儿组织 m5C 呈高度组织特异性,脑组织甲基化水平最高

研究对人胎儿 7 种组织(脑、心、肾、肝、肺、肌肉、胃)进行 m5C 全基因组测序,发现 m5C 分布具有显著组织特异性,59% 脑 m5C 修饰基因、38% 心 m5C 修饰基因仅在单一组织表达(图 1C)。其中胎儿脑组织 m5C 整体水平、修饰位点及 mRNA 数量均显著高于其他组织(图 1D-F),m5C 多富集于内含子与外显子区域(图 1G)。进一步分析显示,m5C 修饰与基因表达稳态正相关,低甲基化基因表达变异更低,提示 m5C 维持胎儿发育转录组稳定(图 2)。

2. 胎儿至成人 m5C 动态上调,调控关键发育通路与可变剪接

对比胎儿与成人 5 种组织,发现成人组织 m5C 水平普遍更高,随发育呈上调趋势(图 3C)。m5C 修饰富集于 WNT、FGF、BMP 等关键发育通路,且通路基因 m5C 水平与表达量正相关(图 3F-H)。同时 m5C 显著调控可变剪接(AS),脑组织 m5C 相关 AS 事件占比超 50%,且低 PSI 值的 m5C-AS 基因转录效率更高,hnRNPL 为关键剪接因子(图 4),揭示 m5C 通过 RNA 加工调控发育。

3.Nsun2 缺失破坏 m5C,致胎儿脑发育异常

Nsun2 cKO 小鼠脑组织 m5C 水平、位点显著降低,神经元增殖减少、凋亡增加,成熟神经元比例异常,神经元分化成熟受阻(图 5)。CUT&Tag 与 ATAC-Seq 显示,Nsun2 缺失上调 H3K27me3、改变染色质开放状态,抑制神经元发育相关基因表达,导致轴突生成、前脑发育受阻(图 6),证实 Nsun2 依赖的 m5C 调控脑发育。

4.Nsun2/Jarid2/Alyref 轴介导 m5C - 组蛋白修饰互作

多组学联合筛选发现,Ezh2、Jarid2 为 Nsun2 调控核心靶基因,其 m5C 水平在 Nsun2 缺失时下降(图 7A-C)。Co-IP 证实 Nsun2 与 Jarid2/Ezh2 互作,m5C 阅读器 Alyref 识别 m5C 并参与复合物形成;过表达 Alyref 可挽救 Nsun2 缺失导致的 Ezh2/Jarid2 表达异常(图 7M-O),明确 Nsun2-m5C-Alyref 调控轴通过组蛋白修饰调控脑发育。

5.Nsun5 缺失独立影响胎儿脑发育

Nsun5 KO 小鼠脑组织 m5C 水平降低,成熟神经元、神经前体细胞数量减少,神经元增殖与 DNA 修复能力受损,H3K27me3、Ezh2 表达下调,H3K4me3 上调(图 8),提示 Nsun5 通过独立于 Nsun2 的途径调控脑发育。

文章小结

本研究首次绘制人胎儿组织 m5C 高分辨率图谱,明确其组织特异性与发育动态特征,证实 m5C 维持基因稳态、调控发育通路与 RNA 加工。揭示 Nsun2/Jarid2/Alyref 核心调控轴,阐明 m5C 通过组蛋白修饰、染色质重塑调控脑发育的分子机制,同时发现 Nsun5 的独立调控作用,为发育障碍机制解析与靶向治疗提供多组学依据。

(对这种思路感兴趣的老师,欢迎联系小编!)欢迎扫码咨询!

往期精选

11.2/Q1,中南大学重磅突破!多组学横扫 TCGA/CGGA 等 6 大数据库,cilengitide 靶向治疗迎新希望!

9.7/Q1,纯生信炸场!NHANES + 网毒 + 113 种机器学习,PCPs 混合暴露致骨关节炎,换疾病直接抄作业!

房颤防治迎来突破!跨人群基因 + 蛋白研究锁定 525 个致病位点,还找到 28 个潜在药靶

阿尔茨海默病研究新突破!锁定 3 个核心蛋白,揭露氧化应激 + 自噬的 “致病密码”,还靠 MR 证实因果!

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  1. CONNECT:[ UseTime:0.001183s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001458s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.022668s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008370s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001370s ]
  6. SELECT * FROM `set` [ RunTime:0.008579s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001758s ]
  8. SELECT * FROM `article` WHERE `id` = 564825 LIMIT 1 [ RunTime:0.013970s ]
  9. UPDATE `article` SET `lasttime` = 1780477837 WHERE `id` = 564825 [ RunTime:0.024626s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.018829s ]
  11. SELECT * FROM `article` WHERE `id` < 564825 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010559s ]
  12. SELECT * FROM `article` WHERE `id` > 564825 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.013731s ]
  13. SELECT * FROM `article` WHERE `id` < 564825 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.027348s ]
  14. SELECT * FROM `article` WHERE `id` < 564825 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.181758s ]
  15. SELECT * FROM `article` WHERE `id` < 564825 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.157657s ]
0.654754s