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IF11.2!!南京医科大团队用GWAS+孟德尔抢发中科院双一区TOP!解锁肝功能标志物的疾病关联与治疗靶点!

  • 2026-05-08 21:52:22
IF11.2!!南京医科大团队用GWAS+孟德尔抢发中科院双一区TOP!解锁肝功能标志物的疾病关联与治疗靶点!

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研究亮点

✅️跨种族大规模整合:首次同时纳入东亚、欧洲、南亚、非洲四人群,样本量~45.6万,提升发现效能和普适性。

✅️多表型联合分析:同时对7项肝功能生物标志物进行系统分析,聚焦多效性变异和共享遗传结构。

✅️精细定位提升共识:证明跨种族精细定位能增强因果变异识别率,并提高跨人群遗传效应一致性。

✅️全新基因定位框架mdS2G:整合位点、相似性和共定位三种证据,性能优于单一策略,并提供R包供广泛使用。

✅️治疗靶点筛选:通过药物靶点MR分析,首次提出PEPD蛋白作为MASLD和肝硬化的潜在干预靶点。

引言

45万人跨种族研究:肝功能背后的“遗传密码”被破译,一个全新肝脏治疗靶点浮出水面

肝功能指标异常是肝脏疾病的“警报器”,但不同人种、不同指标背后的遗传开关是否相同?最新《Genome Medicine》研究整合东亚、欧洲、南亚、非洲超45万人数据,系统绘制7项肝功能指标的遗传图谱,发现210个全新变异,并开发出多维基因定位工具mdS2G。更令人振奋的是,通过孟德尔随机化锁定PEPD蛋白——它有望成为治疗脂肪肝和肝硬化的新靶点。

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文献解析

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研究背景

肝功能生物标志物是评估肝损伤与稳态的关键指标。既往GWAS多孤立研究且以欧洲人群为主,缺乏跨种族、多表型系统整合,其多效性和治疗靶点潜力尚待挖掘。

研究方法

GWAS及meta分析:对7个LFQB分别进行单祖先GWAS,再采用逆方差加权固定效应模型进行跨种族meta分析(P<5×10⁻⁹为显著)。

精细定位:采用PolyFun+SuSiE功能信息精细定位,估算后验包含概率(PIP≥0.5为推定因果)。

PheWAS与PRS分析:对多效性变异进行全表型组关联分析,并计算7个LFQB的多基因风险评分。

基因定位:自主研发mdS2G框架,整合cS2G(位点置信)、PoPS(相似性打分)、coloc(eQTL共定位)。

孟德尔随机化:利用pQTL数据(UKB-PPP)进行药物靶点MR,评估蛋白与肝脏疾病因果关系。

研究结果

01

跨祖谱GWAS荟萃分析识别出5507个LFQBs信号

纳入45.5万多祖源样本、1300余万SNP开展荟萃分析,λGC中位数1.307,LDSC结果表明膨胀源于真实多基因效应。鉴定出5507个显著先导信号,含210个新位点、133个球蛋白相关位点;FinnGen验证33个新位点效应一致,19个达显著水平。性状遗传率0.098–0.175,DBIL偏低,ALT与AST遗传相关为0.677。部分位点存在人群异质性,欧亚间14%效应方向相反,跨种族遗传相关0.72–0.88。饮酒分层发现478个信号受其影响,rs738409在重度饮酒者中效应提升48%–68%。

图1  七个LFQB的跨祖谱GWAS-荟萃分析

02

交叉祖源精细映射识别出2012个LFQB的假定因果信号

精细定位得到2012个推定因果SNP(平均PIP=0.815),742个PIP≥0.95。仅39.9%同时是lead SNP。因果SNP与位点中心平均距离4.1kb。在欧亚共享的1356个信号中,80.3%无异质性,高于lead SNP的76.7%。跨祖先精细定位优于单祖先:PIP≥0.5时因果比例36.5% vs 28.0%。

图2  多祖源LD参考面板提升了精细映射分辨率和跨祖谱共识

03

PheWAS揭示了LFQB相关多效性变异的广泛生物学效应

筛选38个跨至少3个LFQB的因果SNP,错义/截断变异占36.8%,远高于总体16.7%。多个基因位点与T2D、肝癌、胆囊癌及精神健康等表型显著关联,糖蛋白乙酰、IGF1、SHBG富集突出。PRS提示ALB、DBIL评分可降低代谢及肝病、冠脉疾病风险。

图3  38个多效性变体的PheWAS被鉴定为至少三个LFQB共享因果SNP

04

药物靶向磁共振识别多种疾病的潜在治疗靶点

用GeneMANIA做功能网络分析,挑出64个能跨多个LFQBs的可信/枢纽基因。药物靶点MR分析发现,APOE血浆水平升高,会让LDL降低、HDL和血糖升高,还会增加T2D、肝癌、胆道癌风险;PEPD丰度越高,MASLD、ALT及肝硬化风险越低。混合祖先pQTL验证了31个关联中的30个,还新发现ABO-心肌梗死等36个信号。

图4  利用mdS2G框架识别出7个LFQB的1166个可信基因

05

两步全蛋白质组MR分析

为阐明MASLD与多系统疾病关联的分子机制,本研究构建两步全蛋白质组孟德尔随机化框架。首先依托deCODE蛋白质组GWAS数据,评估MASLD对4907种血浆蛋白的因果效应;再分析MASLD调控蛋白对其多基因风险评分关联表型的作用。最后于英国生物样本库队列验证关联,并量化相关蛋白在MASLD疾病通路中的介导效应。

图5  两步磁共振框架和队列验证识别出介导MASLD相关疾病风险的血浆蛋白

文章总结

本研究用GWAS,孟德尔随机化等方法,跨种族GWAS揭示肝功能遗传架构,发现210个新变异及1,166个可信基因,提出mdS2G定位框架,并筛选出PEPD作为脂肪肝和肝硬化的潜在治疗靶点。

如果也想用GWAS+孟德尔随机化思路进行生信分析,复现高分思路,那就快来后台联系吧,走进生信助力每一个科研梦想!

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  1. CONNECT:[ UseTime:0.000506s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000690s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000449s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000490s ]
  8. SELECT * FROM `article` WHERE `id` = 552392 LIMIT 1 [ RunTime:0.000452s ]
  9. UPDATE `article` SET `lasttime` = 1778302580 WHERE `id` = 552392 [ RunTime:0.004693s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000236s ]
  11. SELECT * FROM `article` WHERE `id` < 552392 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000414s ]
  12. SELECT * FROM `article` WHERE `id` > 552392 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000349s ]
  13. SELECT * FROM `article` WHERE `id` < 552392 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001273s ]
  14. SELECT * FROM `article` WHERE `id` < 552392 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004703s ]
  15. SELECT * FROM `article` WHERE `id` < 552392 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002038s ]
0.084754s