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        ADAMTS7基因rs3825807位點(diǎn)單核苷酸多態(tài)性與子癇前期遺傳易感性關(guān)系

        2022-05-30 07:55:00楚靜張璐湯潛劉世國(guó)詹瑛

        楚靜 張璐 湯潛 劉世國(guó) 詹瑛

        [摘要] 目的 探討含Ⅰ型血小板結(jié)合蛋白基序的解聚蛋白樣金屬蛋白酶7(ADAMTS7)基因rs3825807位點(diǎn)多態(tài)性與子癇前期(PE)遺傳易感性的相關(guān)性。方法 使用TaqMan探針實(shí)時(shí)熒光PCR技術(shù),對(duì)山東地區(qū)706例PE病人(病例組)以及926例正常孕婦(對(duì)照組)的外周血DNA進(jìn)行擴(kuò)增,比較兩組孕婦ADAMTS7基因rs3825807位點(diǎn)基因型及等位基因頻率。結(jié)果 病例組和對(duì)照組孕婦ADAMTS7基因rs3825807位點(diǎn)基因型及等位基因頻率差異均無(wú)顯著性(P>0.05);早發(fā)型、晚發(fā)型PE病人基因型及等位基因頻率與對(duì)照組比較差異無(wú)統(tǒng)計(jì)學(xué)意義(P>0.05)。結(jié)論 ADAMTS7基因rs3825807位點(diǎn)多態(tài)性與山東地區(qū)漢族人群PE的遺傳易感性沒有相關(guān)性。

        [關(guān)鍵詞]先兆子癇;ADAMTS7蛋白質(zhì);RNA探針;實(shí)時(shí)聚合酶鏈反應(yīng);疾病遺傳易感性

        [中圖分類號(hào)]R714.24;R363.25[文獻(xiàn)標(biāo)志碼]A[文章編號(hào)]2096-5532(2022)03-0379-04

        doi:10.11712/jms.2096-5532.2022.58.057

        ASSOCIATION OF ADAMTS7 RS3825807 SINGLE NUCLEOTIDE POLYMORPHISM WITH GENETIC SUSCEPTIBILITY TO PRE-ECLAMPSIA

        CHU Jing, ZHANG Lu, TANG Qian, LIU Shiguo, ZHAN Ying

        (Department of Obstetrics and Gyneco-logy, The Affiliated Hospital of Qingdao University, Qingdao 266003, China)

        [ABSTRACT] Objective To investigate the relationship between single nucleotide polymorphism (SNP) of a disintegrin and metalloproteinase with thrombospondin motifs 7 (ADAMTS7) locus rs3825807 and genetic susceptibility to pre-eclampsia (PE).Methods The peripheral blood DNA of 706 PE patients (patient group) and 926 healthy pregnant women (control group) in Shandong province were amplified by TaqMan probe real-time fluorescent quantitative PCR. The genotype and allele frequency of ADAMTS7 rs3825807 were compared between the two groups of pregnant women.?Results There were no significant differences in the genotype and allele frequency of ADAMTS7 rs3825807 between PE patients and healthy pregnant women (P>0.05). There were no significant differences between patients with early and late onset PE and healthy pregnant women (P>0.05).Conclusion ADAMTS7 rs3825807 polymorphism is not associated with genetic susceptibility to PE in Han population living in Shandong province.

        [KEY WORDS] pre-eclampsia; ADAMTS7 protein; RNA probes; real-time polymerase chain reaction; genetic predisposition to disease

        子癇前期(PE)是一種高血壓及炎癥的妊娠疾病,主要表現(xiàn)為妊娠20周后孕婦出現(xiàn)血壓增高、頭痛惡心、蛋白尿等癥狀[1]。PE是導(dǎo)致孕產(chǎn)婦及圍生兒病死率升高的主要原因之一[2-3]。然而,PE的發(fā)病機(jī)制至今尚未明確。有研究結(jié)果表明,PE與遺傳、氧化應(yīng)激、炎癥反應(yīng)失衡[4]、螺旋動(dòng)脈異常重塑、胎盤缺陷及血管生成障礙等有關(guān)[5]。含Ⅰ型血小板結(jié)合蛋白基序的解聚蛋白樣金屬蛋白酶(ADAMTSs)是一個(gè)新定義的金屬蛋白酶家族,共包括19個(gè)成員,其中多個(gè)成員在人胎盤中表達(dá)[6-7]。據(jù)文獻(xiàn)報(bào)道,ADAMTS4和ADAMTS5參與胎盤的形成過(guò)程[8]。ADAMTS13可以促進(jìn)滋養(yǎng)細(xì)胞發(fā)育,在PE中的表達(dá)降低[9]。而ADAMTS7在人體組織中廣泛分布,主要參與動(dòng)脈粥樣硬化的發(fā)生發(fā)展[10]、血管基質(zhì)的重塑以及骨分化[11]。有研究結(jié)果表明,ADAMTS7還能協(xié)調(diào)血管平滑肌細(xì)胞和內(nèi)皮細(xì)胞的功能,從而促進(jìn)新內(nèi)膜的形成[12]。本課題組前期的研究結(jié)果顯示,PE中ADAMTS7基因啟動(dòng)子甲基化水平較低[13],而這是否與基因的多態(tài)性有關(guān)目前還未可知。因此,本研究選擇影響ADAMTS7成熟和平滑肌細(xì)胞遷移的rs3825807位點(diǎn)[14]進(jìn)行檢測(cè),以進(jìn)一步探討ADAMTS7基因與PE遺傳易感性的關(guān)系,為PE的早期診斷提供新的方向?,F(xiàn)將結(jié)果報(bào)告如下。

        1對(duì)象與方法

        1.1研究對(duì)象

        選取2018—2019年就診于青島大學(xué)附屬醫(yī)院、濱州醫(yī)學(xué)院附屬醫(yī)院、聊城市人民醫(yī)院、煙臺(tái)毓璜頂醫(yī)院及臨沂市人民醫(yī)院等山東省醫(yī)院的孕婦1 632例作為研究對(duì)象,其中確診PE病人706例(病例組),正常孕婦926例(對(duì)照組)。PE的診斷標(biāo)準(zhǔn)依據(jù)2018年國(guó)際妊娠期高血壓研究學(xué)會(huì)(ISSHP)制訂的《妊娠期高血壓疾?。篒SSHP分類、診斷和管理指南》[15],即妊娠20周以后出現(xiàn)血壓升高伴或不伴蛋白尿。早發(fā)型PE即34周前發(fā)病者,晚發(fā)型PE即34周及以后發(fā)病者。排除標(biāo)準(zhǔn):有慢性高血壓、糖尿病、心臟病、腎病及肝病病史的孕婦,胎膜早破、前置胎盤、先兆流產(chǎn)、輔助生殖、雙胎及巨大兒孕婦。收集所有研究對(duì)象的一般資料。

        1.2樣本采集及基因型檢測(cè)

        采集孕婦的空腹肘靜脈血3 mL,置于EDTA抗凝管中,用2 mL EP管分裝后置-80 ℃冰箱中保存?zhèn)溆谩S醚夯蚪MDNA提取試劑盒(北京天根公司)提取外周血基因組DNA。采用TaqMan探針實(shí)時(shí)熒光PCR技術(shù)對(duì)ADAMTS7基因rs3825807位點(diǎn)進(jìn)行基因型檢測(cè)。rs3825807位點(diǎn)上下游引物分別為5′-GTCCCCCTGTGAGGCAA-TTT-3′和5′-CCGTGGTACTCCACCATTTTG-3′。

        PCR反應(yīng)體系7 μL,包括2×Mix 3.5 μL、ddH2O 2.45 μL、20×SNP探針0.05 μL、DNA模板1 μL。應(yīng)用SLAN-96S全自動(dòng)醫(yī)用PCR分析系統(tǒng)進(jìn)行基因分型,PCR反應(yīng)條件為:95 ℃、10 min,95 ℃、15 s,60 ℃、1 min,共40個(gè)循環(huán)。在每個(gè)周期60 ℃延伸過(guò)程中采集探針熒光強(qiáng)度。通過(guò)檢測(cè)不同等位基因所標(biāo)識(shí)的熒光信號(hào),判讀待測(cè)樣本的基因型。

        1.3統(tǒng)計(jì)學(xué)分析

        采用SPSS 25.0軟件進(jìn)行數(shù)據(jù)的統(tǒng)計(jì)分析。采用Hardy-Weinberg遺傳平衡檢驗(yàn)檢測(cè)群體基因遺傳平衡,當(dāng)P>0.05時(shí),說(shuō)明群體基因遺傳平衡,樣本具有良好的代表性。計(jì)量資料數(shù)據(jù)以x±s表示,兩組比較采用t檢驗(yàn);基因型及等位基因頻率以百分率表示,兩組比較采用Pearson-χ2檢驗(yàn)。P<0.05認(rèn)為差異有統(tǒng)計(jì)學(xué)意義。

        2結(jié)果

        2.1兩組一般資料的比較

        兩組孕婦孕后體質(zhì)量指數(shù)(BMI)、入院孕周、分娩孕周、收縮壓(SBP)、舒張壓(DBP)和胎兒出生體質(zhì)量比較差異均有顯著性(t=-51.81~21.07,P<0.001),而兩組孕婦年齡、孕前BMI、孕次及流產(chǎn)次數(shù)比較則差異無(wú)顯著性(P>0.05)。見表1。

        2.2Hardy-Weinberg遺傳平衡檢驗(yàn)

        Hardy-Weinberg的檢驗(yàn)結(jié)果顯示,ADAMTS7基因rs3825807位點(diǎn)在對(duì)照組和病例組均符合遺傳平衡定律(χ2=0.362、0.722,P>0.05),表明本研究選取的樣本具有較好的群體代表性。

        2.3兩組ADAMTS7基因rs3825807位點(diǎn)基因型及等位基因頻率比較

        本研究病例組和對(duì)照組孕婦ADAMTS7基因rs3825807位點(diǎn)的3種基因型頻率比較差異無(wú)顯著性(χ2=1.329,P>0.05),等位基因頻率也未見明顯差異(χ2=1.207,P>0.05)。見表2。早發(fā)型、晚發(fā)型PE病人ADAMTS7基因rs3825807位點(diǎn)3種基因型及等位基因頻率與對(duì)照組比較,差異均無(wú)統(tǒng)計(jì)學(xué)意義(χ2=0.146~2.000,P>0.05)。見表3。

        3討論

        PE是一種妊娠常見的并發(fā)癥,每年在全球范圍內(nèi)造成約7萬(wàn)名孕產(chǎn)婦死亡,其中大部分發(fā)生在低收入和中等收入國(guó)家[16]。而對(duì)PE發(fā)病機(jī)制的研究則可以幫助我們更好地診治PE。

        目前,有關(guān)PE發(fā)病機(jī)制常見的學(xué)說(shuō)有如下幾個(gè)。①氧化應(yīng)激-血管內(nèi)皮損傷學(xué)說(shuō)。內(nèi)皮一氧化氮合酶(e-NOS)可誘導(dǎo)一氧化氮(NO)的合成,NO可以使動(dòng)脈床血管擴(kuò)張。在PE中,氧化應(yīng)激會(huì)增加脂質(zhì)過(guò)氧化物的生成,導(dǎo)致內(nèi)皮功能障礙[17]、e-NOS缺乏,可以導(dǎo)致胎盤床、腎血管系統(tǒng)和其他器官血管床的血管收縮,引起血壓升高[18]。②免疫調(diào)節(jié)異常學(xué)說(shuō)。胎盤、白細(xì)胞和腎足細(xì)胞中富含Toll樣受體4(TLR4),研究表明PE的發(fā)生與胎盤和腎臟中TLR4的過(guò)表達(dá)有關(guān)[19]。TLR4的增加會(huì)導(dǎo)致炎癥細(xì)胞因子的增加和胎盤/腎臟功能障礙[20]。此外,抗炎細(xì)胞因子的減少也會(huì)引起PE的發(fā)生[21]。③胎盤或滋養(yǎng)細(xì)胞缺血低氧學(xué)說(shuō)。在正常妊娠中,胎盤的滋養(yǎng)細(xì)胞侵入子宮壁,用低阻力的血管系統(tǒng)取代高阻力的子宮螺旋動(dòng)脈和小動(dòng)脈。這種重塑在PE中存在缺陷,可引起胎盤缺血,進(jìn)而導(dǎo)致可溶性fms樣酪氨酸激酶1(sFlt-1)和可溶性內(nèi)皮糖蛋白(sEng)的過(guò)量生產(chǎn)[22]。sFlt-1在血液中可以與血管內(nèi)皮生長(zhǎng)因子(VEGF)和胎盤生長(zhǎng)因子(PLGF)結(jié)合,而高sFlt-1和低VEGF/PLGF參與了高血壓的發(fā)生。同樣,高sEng有助于高血壓和蛋白尿的發(fā)展[23]。

        ADAMTS7為金屬基質(zhì)蛋白酶家族的一員,基因位于15q25染色體上,其主要作用是降解細(xì)胞外基質(zhì),與多數(shù)心血管疾病的發(fā)生發(fā)展以及關(guān)節(jié)炎中軟骨細(xì)胞外基質(zhì)蛋白的降解密切相關(guān)[24-25]。還有研究指出,ADAMTS7的升高能引起孕婦流產(chǎn)[26]。ADAMTS7 rs3825807位點(diǎn)由腺嘌呤(A)至鳥嘌呤(G)的取代可導(dǎo)致ADAMTS7前結(jié)構(gòu)域中絲氨酸至脯氨酸的取代[27],激活的ADAMTS7具有蛋白水解活性,會(huì)裂解軟骨寡聚基質(zhì)蛋白(COMP),影響ADAMTS7的成熟和平滑肌細(xì)胞的遷移[14,28]。此外,有研究表明,ADAMTS7 rs3825807位點(diǎn)上A等位基因與冠心病及缺血性腦卒中易感性相關(guān)[29]。本課題組前期研究表明,ADAMTS7是PE的重要調(diào)節(jié)因子,PE病人胎盤中ADAMTS7的啟動(dòng)子區(qū)甲基化程度降低,導(dǎo)致ADAMTS7在胎盤中的表達(dá)增加,進(jìn)而抑制滋養(yǎng)細(xì)胞的遷移、侵襲等功能,導(dǎo)致母體螺旋動(dòng)脈重塑不足和血流不足[13],最終導(dǎo)致胎盤缺血,引起PE。而本研究結(jié)果顯示,病例組和對(duì)照組ADAMTS7基因rs3825807位點(diǎn)基因型和等位基因頻率比較差異無(wú)顯著性,早發(fā)型、晚發(fā)型PE病人基因型及等位基因頻率與對(duì)照組比較差異亦無(wú)顯著性。提示ADAMTS7基因rs3825807位點(diǎn)多態(tài)性與山東地區(qū)漢族人群PE發(fā)病可能不相關(guān)。

        PE是一種很復(fù)雜的多基因遺傳性疾病,受多個(gè)基因、多個(gè)位點(diǎn)的調(diào)控,且環(huán)境、飲食、生活方式等也會(huì)對(duì)其發(fā)生發(fā)展產(chǎn)生影響,故本研究結(jié)果仍需要通過(guò)擴(kuò)大樣本量進(jìn)行更深入的研究確認(rèn)。另外,對(duì)于ADAMTS7基因多態(tài)性與PE易感性關(guān)系的研究還需要選取多個(gè)位點(diǎn)進(jìn)行研究,從而為PE的臨床診治及預(yù)防提供遺傳學(xué)依據(jù)。

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        (本文編輯馬偉平)

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