当前位置:首页>南京>IF11.2!!南京医科大学凭“多组学+孟德尔随机化+GWAS”揽下双一区TOP 解锁肝功能生物标志物的多效基因与治疗靶点

IF11.2!!南京医科大学凭“多组学+孟德尔随机化+GWAS”揽下双一区TOP 解锁肝功能生物标志物的多效基因与治疗靶点

  • 2026-05-09 15:31:15
IF11.2!!南京医科大学凭“多组学+孟德尔随机化+GWAS”揽下双一区TOP 解锁肝功能生物标志物的多效基因与治疗靶点

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研究亮点

1.跨族裔大样本设计:纳入东亚、欧洲、南亚、非洲 4 大洲裔共约 45.6 万受试者,大幅拓展了既往 GWAS 研究的人群多样性,提升了遗传发现的普适性。

2.多组学联合解析:结合精细定位、表型组关联分析(PheWAS)、基因连锁与孟德尔随机化(MR)多维度分析,从遗传变异到疾病关联实现了系统性解读

3.新方法构建:提出多维基因连锁框架 mdS2G,将因果位点与 1166 个候选基因关联,相比单一策略显著提升了肝细胞富集效率。

引言

本研究由南京医科大学领衔完成,通讯作者为沈洪兵教授、宋锶教授等团队成员,发表于《Genome Medicine》。研究针对肝功能相关定量生物标志物(LFQBs)开展跨族裔全基因组关联研究,旨在突破既往单人群研究的局限,系统解析肝功能的遗传结构,挖掘与全身疾病相关的多效基因变异,并为肝病治疗提供潜在靶点。

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研究背景

肝功能相关定量生物标志物(LFQBs)是评估肝脏健康的核心指标,但既往全基因组关联研究(GWAS)多局限于单一人群开展孤立分析,对肝功能的遗传结构、跨人群共享变异及与全身疾病的关联机制缺乏系统性认知,限制了肝病相关治疗靶点的挖掘与转化应用。

研究方法

多组学

GWAS

对约 45.6 万例覆盖四大洲裔的受试者开展 7 项肝功能生物标志物的跨族裔 GWAS meta 分析,识别全基因组显著关联信号并精细定位。 

转录组 (GTEx)

利用 GTEx 数据库的肝脏表达数据,通过基因连锁分析,将 GWAS 发现的因果位点映射到肝脏中表达的候选基因。

单细胞转录组

对映射的候选基因进行肝细胞富集分析,验证其在肝脏细胞中的特异性表达,提升基因功能解析的精准度。 

微生物组

未直接纳入微生物组数据,但研究中发现的肝功能相关遗传变异,为后续探究宿主 - 微生物互作提供了潜在靶点。

蛋白质组

结合 MR 分析,将候选基因编码的 PEPD 蛋白作为研究对象,验证其与 MASLD 及肝硬化的因果关联,锁定潜在治疗靶点。 

表型组 (PheWAS)

基于多效变异和多基因风险评分开展 PheWAS,解析肝功能紊乱与全身多种疾病及代谢性状的广泛关联。

孟德尔随机化

mbQTL MR

利用肝脏表达的顺式 eQTL/mbQTL 作为工具变量,验证候选基因与肝功能及相关疾病的因果关联,提升位点功能解析的可靠性。

药物靶点MR

以 PEPD 蛋白为暴露,通过 MR 分析证实其与 MASLD、肝硬化存在因果关联,为该蛋白作为肝病治疗靶点提供了遗传学证据。

研究结果

01

跨族裔 GWAS 荟萃分析

我们对四大祖先人群455925名研究对象的13410236个单核苷酸多态性位点进行荟萃分析,虽存在中等统计膨胀但无人群分层。经筛选识别出5507个核心显著遗传信号(P<5×10⁻⁹;图1a),其中210个为全新信号,133个与球蛋白相关(图1b)。遗传力与遗传相关性分析显示多数肝功能标志物呈中等遗传力,关联模式与表型吻合(图1c),跨祖先人群遗传异质性分析显示部分位点存在异质性(图1d)。

图1:7个LFQBs的跨祖先gwas meta分析

02

细胞 / 组织富集分析联合 mbQTL-MR

我们在SNP和基因层面探究七种LFQB遗传信号的细胞组织富集特征,经分析,直接胆红素主要富集于血液、肝脏及肠道相关细胞,其余六种LFQB富集范围更广,严格阈值下肠道、肝脏及血液组织富集占比升高。细胞层面分析显示多数LFQB在肝细胞、肠道上皮细胞中富集,β-半乳糖苷酶则富集于免疫细胞。此外,mbQTL双样本MR分析发现12个微生物分类群对三种及以上LFQB有显著因果效应。

03

跨祖先图谱解析 LFQB 因果信号

本研究基于 PolyFun 框架完成基因座精细定位,筛选出 2012 个潜在因果 SNP(图 2a-d)。跨祖先异质性分析显示,多数因果信号人群遗传结构更稳定(图 2e)。相较单一欧洲人群,跨祖先联合定位可显著提升遗传信号解析效率与检出数量(图 2f)。

图2:多祖先LD参考面板提高精细映射分辨率和跨祖先共识

04

PheWAS 解析 LFQB 多效变异效应

本研究筛选出 38 个肝脏稳态相关多效性 SNP,蛋白功能变异占比更高。多数变异广泛关联代谢等表型(图 3a)。重点解析 CCND2、SLC30A10 关键变异的多效效应与疾病关联(图 3b-c),并明确多效变异的核心关联表型分布特征(图 3d)。

图3:38个多效性变异的PheWAS被确定为至少3个lfqb的共享因果snp

05

多维 SNP - 基因框架鉴定可信基因

本研究构建 mdS2G 多维关联框架,弥补传统方法缺陷,解析 2012 个精细定位信号,共鉴定 1166 个肝功能相关可信基因(图 4a)。相较 cS2G,该框架可强化肝肠细胞富集、提升弱富集细胞识别能力(图 4b-c),并揭示不同肝功指标的基因重叠特征与调控差异(图 4d)。

图4:利用mdS2G框架鉴定7个lfqb的1166个可信基因

06

药物靶向 MR 筛选疾病治疗靶点

本研究构建基因互作网络筛选肝损伤核心基因,筛选出 64 个肝脏稳态关键基因。通过药物靶点孟德尔随机化分析,探究蛋白与疾病的因果关联,得到多项显著关联关系,明确 APOE、肽酶 D 等关键分子的调控作用。混合血统数据进一步验证并补充了新的关联证据。

文章小结

跨族裔 GWAS 识别 5507 个肝功能关联信号(含 210 个新信号),获 2012 个潜在因果变异;发现 38 个多效变异,构建 mdS2G 框架,证实 PEPD 为肝病潜在靶点,绘制遗传图谱并提供研究工具。

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  1. CONNECT:[ UseTime:0.000772s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000609s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.019386s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000326s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000624s ]
  6. SELECT * FROM `set` [ RunTime:0.000226s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000646s ]
  8. SELECT * FROM `article` WHERE `id` = 545848 LIMIT 1 [ RunTime:0.000861s ]
  9. UPDATE `article` SET `lasttime` = 1778987033 WHERE `id` = 545848 [ RunTime:0.018750s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000447s ]
  11. SELECT * FROM `article` WHERE `id` < 545848 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002100s ]
  12. SELECT * FROM `article` WHERE `id` > 545848 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000479s ]
  13. SELECT * FROM `article` WHERE `id` < 545848 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001425s ]
  14. SELECT * FROM `article` WHERE `id` < 545848 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002025s ]
  15. SELECT * FROM `article` WHERE `id` < 545848 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003015s ]
0.159633s