Identification of ZFPM2 mutations in sporadic conotruncal heart defect patients

Identification of ZFPM2 mutations in sporadic conotruncal heart defect patients
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散发性圆锥干心脏缺陷患者中 ZFPM2 突变的鉴定

DOI:
10.1007/s00438-017-1373-6
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发表时间:
2018-02
影响因子:
3.1
通讯作者:
Sun Kun
Sun Kun
中科院分区:
生物学3区
文献类型:
--
作者:
Pu Tian;Liu Yang;Xu Rang;Li Fen;Chen Sun;Sun Kun

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圆锥动脉干心脏缺陷 (CTD) 是一组涉及流出道异常和心脏动脉极的心脏畸形。最近的报告在人类和动物模型中发现了许多与 CTD 相关的基因突变。 ZFPM2 作为与 GATA4 相互作用的转录辅助因子,在心脏发育中发挥作用。由于在敲除小鼠模型中发现 ZFPM2 对心脏发育很重要,因此我们在 528 名 CTD 患者中筛选了 ZFPM2 突变。我们鉴定了 6 个罕见且非同义的 ZFPM2 变体,这是首次在东亚人中报道其中 5 个变体(R698Q、R736L、E1005K、T32A 和 I488V)。 Western印迹显示野生型ZFPM2、ZFPM2R698Q或ZFPM2R736L的蛋白表达没有显着差异。双荧光素酶报告基因测定表明,ZFPM2 突变体 R698Q 和 R736L 均减少 GATA4 介导的转录。然而,当ZFPM2R698Q与GATA4共转染时,BNP启动子活性显着增加,而与ZFPM2R736L和GATA4共转染并没有显着增加BNP启动子活性。这表明R698Q突变可能影响ZFPM2结合GATA4的能力。
Conotruncal heart defects (CTDs) are a group of cardiac malformations that involve outflow tract anomalies and the arterial pole of the heart. Recent reports have identified mutations in a number of genes associated with CTDs in human and animal models. ZFPM2 plays a role in cardiac development by acting as a transcriptional cofactor that interacts with GATA4. BecauseZFPM2was found to be important for cardiac development in a knockout mouse model, we screened forZFPM2mutations in 528 CTD patients. We identified six rare and nonsynonymousZFPM2variants, and this was the first time that five of these variants (R698Q, R736L, E1005K, T32A, and I488V) were reported in East Asians. Western blots showed that there was no significant difference in the protein expression of wild-type ZFPM2, ZFPM2R698Q, or ZFPM2R736L. A dual luciferase reporter assay demonstrated that both ZFPM2 mutants R698Q and R736L reduced GATA4-mediated transcription. However, when ZFPM2R698Q was co-transfected with GATA4, BNP promoter activity increased significantly, whereas co-transfection with ZFPM2R736L and GATA4 did not significantly increase BNP promoter activity. This suggests that the R698Q mutation may affect the ability of ZFPM2 to bind GATA4.
DOI: --
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