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IF10.8!恭喜南昌一附院用“共病分析+单细胞+GWAS”拿下双一区TOP! 首创csMR整合策略!

  • 2026-02-08 17:34:43
IF10.8!恭喜南昌一附院用“共病分析+单细胞+GWAS”拿下双一区TOP! 首创csMR整合策略!
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引言

🌟肠脑轴新发现!脑细胞是关键中介!

南昌大学团队在《eBioMedicine》发表重磅研究,首创细胞分层孟德尔随机化(csMR)框架,破解炎症性肠病(IBD)与神经精神疾病的关联谜题研究发现少突胶质细胞、星形胶质细胞等特定脑细胞是核心介导者,UC通过左毯状束结构变化致精神分裂症,CD经右颞下回改变增脑动脉瘤风险,同时锁定FADS1、CARD9等关键基因,为肠脑轴疾病精准治疗开辟新路径!

如果你也想用GWAS数据库高效发文、快速出成果,快点击下方名片后台私信我们吧~ “生信大狙”为您提供更完善的角度!

INTRODUCTION
研究亮点

🌟首创细胞分层孟德尔随机化应用首次将细胞分层孟德尔随机化(csMR)框架应用于炎症性肠病(IBD)与神经精神疾病关联研究,突破传统MR无法捕捉细胞特异性效应的局限,精准定位介导疾病互作的关键脑细胞类型。

🌟明确细胞特异性因果关联:发现少突胶质细胞分层的IBD风险变异与多发性硬化症、精神分裂症显著相关;星形胶质细胞分层的溃疡性结肠炎(UC)变异与强迫症、精神分裂症相关;抑制性神经元分层的克罗恩病(CD)变异与多发性硬化症相关,揭示细胞特异性致病路径。

🌟解析脑结构介导机制:通过中介分析明确两条关键路径,左毯状束平均扩散率变化介导31.4%的UC致精神分裂症风险,右颞下回结构改变介导37.5%的CD致脑动脉瘤风险,首次建立IBD-脑结构-神经精神疾病的因果链条。

🌟多维数据整合验证整合GWAS、单细胞eQTL、脑影像表型(IDP)数据,结合SuSiE共定位、双向MR、中介分析等多方法验证,提升结果可信度与机制解析深度。

文献解读
Literature Interpretation
# 研究背景 #

IBD(含UC和CD)与焦虑、抑郁、精神分裂症等神经精神疾病的临床关联已被广泛报道,但潜在机制尚不明确。传统研究多依赖观察性设计或批量组织分析,难以揭示细胞特异性遗传机制。

# 研究方法 #

1.数据收集

°获取IBD(含UC、CD)、14种神经精神疾病的GWAS数据,人脑8种细胞类型的单细胞eQTL数据,以及39691名受试者的477个脑影像表型(IDP)数据。

2.共定位分析

°采用SuSiE方法进行GWAS性状与单细胞eQTL的共定位分析,筛选细胞特异性候选工具变量(IVs),设定PPH4>0.8为强共定位阈值。

3.细胞分层MR分析

°基于筛选的IVs进行双向两样本MR分析,采用IVW、MR-Egger等多种方法(图1),评估IBD(UC、CD)与神经精神疾病的细胞特异性因果关联,通过FDR校正控制多重检验。

图1 csMR研究工作流程,用于研究IBD与神经精神病学相互作用

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主要结果
Main Results
# 风险变异的细胞特异性表达影响 #

IBD、UC和CD的风险SNP对脑细胞基因表达的调控具有显著细胞特异性。IBD相关SNP在兴奋性神经元和少突胶质细胞中富集共定位基因;UC相关SNP在星形胶质细胞、小胶质细胞中细胞特异性最强,90%的共定位SNP仅调控单一细胞类型;CD相关SNP则在小胶质细胞、兴奋性神经元中表现出明显的细胞特异性表达调控,多数共定位基因仅在特定脑细胞中发挥作用(图2)。

图2 IBD风险变异及不同脑细胞类型基因表达的遗传共定位分析

细胞分层因果关联推断 #

传统MR未发现显著关联,但细胞分层MR揭示了明确的细胞特异性因果关系。少突胶质细胞分层的IBD变异与多发性硬化症、精神分裂症相关;星形胶质细胞分层的UC变异与强迫症、精神分裂症相关,且对腕管综合征有保护作用;少突胶质细胞和抑制性神经元分层的CD变异均与多发性硬化症相关,同时CD变异还通过特定脑细胞类型影响精神分裂症、脑动脉瘤等疾病风险(图3、4、5、6)。

图3 IBD与14种神经精神疾病之间的潜在因果关系,通过细胞分层孟德尔随机化(CS-MR)评估

图4 UC与14种神经精神疾病之间的强因果关系,通过细胞分层孟德尔随机化(CS-MR)评估

图5 CD与14种神经精神疾病之间的潜在因果关系,通过细胞分层孟德尔随机化(cs-MR)评估

图6 IBD、UC和CD对脑部IDPs的细胞分层潜在因果效应

#  IDP介导的因果路径识别 #

通过MR和中介分析,发现两条关键介导路径。UC通过少突胶质细胞影响左毯状束平均扩散率,该脑结构变化介导31.4%的UC致精神分裂症风险;CD通过少突胶质细胞改变右颞下回结构,该变化介导37.5%的CD致脑动脉瘤风险,且反向MR未发现反向因果证据(图7)。

图7 脑部流离失所者对通过MR和介介分析识别的六种神经精神疾病的影响

#  关键遗传驱动因子鉴定 #

筛选出多个细胞特异性关键基因。IBD中,少突胶质细胞内的FADS1、FDPS基因与多发性硬化症、精神分裂症相关;UC中,兴奋性神经元的CARD9、SLC2A10基因与自闭症相关,星形胶质细胞的PSMB6基因与精神分裂症相关;CD中,少突胶质细胞的ENOX1、FADS2基因与多发性硬化症相关,兴奋性神经元的ERAP2、TUT1基因与腕管综合征相关(图8)。

图8 潜在因果通路中的关键共定位基因,连接IBD、脑部IDPs和神经精神疾病

文章小结
Article Summary

本研究通过创新的细胞分层孟德尔随机化框架,系统解析了IBD与神经精神疾病互作的细胞特异性遗传机制。研究首次明确少突胶质细胞、星形胶质细胞等关键脑细胞类型在疾病关联中的介导作用,揭示了脑结构改变作为核心中介的两条关键路径,并锁定FADS1、CARD9等核心遗传驱动因子。这些发现不仅填补了肠-脑轴机制研究中细胞特异性效应的空白,还建立了IBD与神经精神疾病之间的因果链条,为开发细胞靶向治疗策略提供了全新方向。

如果你也想进行这方面的研究,高效复现高分经典思路,快来后台私信我们吧~,每日分享高分文献,欢迎联系生信大狙!

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  1. CONNECT:[ UseTime:0.000461s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000559s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001355s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000305s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000470s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 471346 LIMIT 1 [ RunTime:0.000559s ]
  9. UPDATE `article` SET `lasttime` = 1770971644 WHERE `id` = 471346 [ RunTime:0.011464s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000248s ]
  11. SELECT * FROM `article` WHERE `id` < 471346 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000637s ]
  12. SELECT * FROM `article` WHERE `id` > 471346 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002812s ]
  13. SELECT * FROM `article` WHERE `id` < 471346 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007999s ]
  14. SELECT * FROM `article` WHERE `id` < 471346 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001061s ]
  15. SELECT * FROM `article` WHERE `id` < 471346 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014678s ]
0.114004s