Copy number gain of pro-inflammatory genes in patients with HBV-related acute-on-chronic liver failure.

Copy number gain of pro-inflammatory genes in patients with HBV-related acute-on-chronic liver failure.
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乙型肝炎相关慢加急性肝衰竭患者促炎基因的拷贝数增加

DOI:
10.1186/s12920-020-00835-5
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发表时间:
2020-12-01
影响因子:
2.7
通讯作者:
Deng G
Deng G
中科院分区:
医学3区
文献类型:
--
作者:
Sun F;Tan W;Dan Y;Wang X;Guo Y;Deng G

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宿主遗传因素,如单核苷酸变异,可能在乙肝病毒相关的慢加急性肝衰竭(ACLF)的发病及进展过程中发挥关键作用。然而,目前对于该病病理过程中涉及的潜在基因组拷贝数变异(CNV)尚不清楚。 我们对两个队列进行了基因分型,其中包括389例乙肝病毒相关的ACLF患者和391例无症状乙肝病毒携带者(AsC),随后开展了基于CNV的总体负荷分析和全基因组关联研究(GWAS)。 对于1874个罕见CNV,乙肝病毒相关的ACLF患者表现出大量大小为100 - 200 kb的缺失片段(P值 = 0.04),且相关基因在白细胞跨内皮迁移通路中显著富集(P值 = 4.68×10⁻³)。对于352个常见CNV,GWAS预测出17个显著的关联信号,其中最强的信号是位于1p36.13的一个重复片段(约38 Kb,P值 = 1.99×10⁻⁴,优势比 = 2.66)。与AsC对照组相比,这些相关的CNV使得乙肝病毒相关的ACLF患者体内促炎基因(MST1L、DEFB和HCG4B)的拷贝数更多。 我们的研究结果表明,宿主CNV对乙肝病毒相关ACLF的影响,可能是通过在乙肝病毒感染期间降低天然免疫并增强宿主炎症反应来实现的。这些发现凸显了基因剂量对该疾病肝脏过度炎症的潜在重要性。
BackgroundHost genetic factors such as single nucleotide variations may play a crucial role in the onset and progression of HBV-related acute-on-chronic liver failure (ACLF). However, the underlying genomic copy number variations (CNVs) involved in the pathology are currently unclear.MethodsWe genotyped two cohorts with 389 HBV-related ACLF patients and 391 asymptomatic HBV carriers (AsCs), and then carried out CNV-based global burden analysis and a genome-wide association study (GWAS).ResultsFor 1874 rare CNVs, HBV-related ACLF patients exhibited a high burden of deletion segments with a size of 100–200 kb (Pvalue = 0.04), and the related genes were significantly enriched in leukocyte transendothelial migration pathway (Pvalue = 4.68 × 10–3). For 352 common CNVs, GWAS predicted 17 significant association signals, and the peak one was a duplication segment located on 1p36.13 (~ 38 Kb,Pvalue = 1.99 × 10–4, OR = 2.66). The associated CNVs resulted in more copy number of pro-inflammatory genes (MST1L, DEFB, and HCG4B) in HBV-related ACLF patients than in AsC controls.ConclusionsOur results suggested that the impact of host CNV on HBV-related ACLF may be through decreasing natural immunity and enhancing host inflammatory response during HBV infection. The findings highlighted the potential importance of gene dosage on excessive hepatic inflammation of this disease.
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