IL-15基因單核苷酸多態(tài)性與兒童急性淋巴細(xì)胞白血病的相關(guān)性研究
發(fā)布時間:2018-06-27 10:00
本文選題:白細(xì)胞介素-15 + 兒童急性淋巴細(xì)胞白血病 ; 參考:《重慶醫(yī)科大學(xué)》2012年碩士論文
【摘要】:目的:急性淋巴細(xì)胞白血病(ALL)是兒童時期最常見的惡性腫瘤,兒童ALL的化療以基于不同危險(xiǎn)因素的個體化治療為主,雖然已經(jīng)識別出多個與兒童ALL預(yù)后不良相關(guān)的危險(xiǎn)因素,但這些危險(xiǎn)因素造成預(yù)后不良的機(jī)制不完全清楚。IL-15是與免疫細(xì)胞增殖、分化以及凋亡密切相關(guān)的細(xì)胞因子。近來的研究顯示IL-15與ALL的發(fā)病及預(yù)后有關(guān),其中發(fā)現(xiàn)IL-15基因單個核苷酸多態(tài)性位點(diǎn)(SNP),即rs17007695、rs35964658、rs10519613、rs10519612、rs17015014與兒童ALL微小殘留病密切相關(guān),同時發(fā)現(xiàn)rs17007695和rs10519612與中國成人急淋的發(fā)病易感性有關(guān)。 高分辨率熔解曲線分析是近年來受到關(guān)注的一種高通量、準(zhǔn)確、廉價(jià)的基因分型技術(shù),其中非標(biāo)記探針法尤其適用于對已知SNPs位點(diǎn)進(jìn)行基因分型。本研究通過建立用于檢測IL-15基因SNP位點(diǎn)的HRM-非標(biāo)記探針的方法,對IL-15基因4個SNPs位點(diǎn)(rs17007695、rs35964658、rs10519613、rs17015014)進(jìn)行基因分型,并在此基礎(chǔ)上探討IL-15基因單核苷酸多態(tài)性與中國兒童ALL發(fā)病易感性以及與兒童ALL預(yù)后不良危險(xiǎn)因素的關(guān)系。 方法:病例組為173例入組CCLG-2008治療方案的ALL患兒,正常對照組為222例健康體檢的兒童。采用高分辨率熔解曲線-非標(biāo)記探針法對rs17007695、rs35964658、rs10519613、rs17015014共四個SNPs進(jìn)行基因分型。運(yùn)用SHEsis在線軟件及SPSS17.0統(tǒng)計(jì)軟件進(jìn)行各組間基因型分布差異分析及OR值計(jì)算。 結(jié)果: 1.非標(biāo)記探針法與基因測序分型結(jié)果一致,,能夠?qū)Ρ狙芯克婕暗?個位點(diǎn)進(jìn)行準(zhǔn)確分型。另一方面,在未加入高低溫內(nèi)標(biāo)的的情況下,小片段擴(kuò)增法不能區(qū)分野生純合子和突變純和子。 2.rs17007695、rs35964658、rs10519613和rs17015014的等位基因和基因型分布在ALL組和對照組間無差異。rs17015014C等位基因在B-ALL患兒和對照組間有差異,C等位基因與B-ALL患病相關(guān)(P=0.03,OR1.39,95%CI1.03 1.87),其中CC型增加了B-ALL的患病風(fēng)險(xiǎn)(P=0.03,OR1.89,95%CI1.05-3.41)。 3.對ALL組和對照組進(jìn)行性別年齡的分層分析后發(fā)現(xiàn),rs17015014-CC型是女性兒童人群發(fā)生ALL的危險(xiǎn)因素(P=0.04,OR3.06,95%CI1.04-8.99);經(jīng)過校正,即去除性別和年齡因素影響后,rs17015014-CC型在ALL組和對照組間的分布差異具有顯著性(P=0.04,OR1.88,95%CI1.03 3.48),并且其在B-ALL組和對照組間的差異顯著性經(jīng)校正后仍然存在(P=0.04,OR=1.93,95%CI1.04-3.56)。 4.rs10519613、rs35964658、rs17007695和rs17015014構(gòu)成5種主要的單倍型(最小單倍型頻率3%):CATG、AGCC、CATC、AGCG和CACC。其中,病例組CACC單倍型頻率較對照組高(0.048和0.015,P=0.0057;OR:3.392,95%CI:1.357~8.480)。 5.rs10519613基因型在誘導(dǎo)緩解第15天不同骨髓緩解狀態(tài)組間的分布具有差異,CC型患兒第15天骨髓緩解狀態(tài)為M3的分布頻率較M1+M2組高(66.7%和28.1%,P=0.035);單倍型分析顯示CATG型在D15-M3組分布頻率較在M1+M2組中高(OR2.416,95%CI1.049 5.774,P=0.034)。 6.未發(fā)現(xiàn)有與初診危險(xiǎn)度分組相關(guān)的基因型或單倍體型;但在經(jīng)過危險(xiǎn)度調(diào)整后,單倍型AGTG在中高危組的分布頻率較在低危組低(OR0.108,95%CI0.016 0.753,P=0.045)。 結(jié)論: 1.rs10519613、rs35964658、rs17007695與兒童ALL的發(fā)病風(fēng)險(xiǎn)無相關(guān)性,在分層分析中亦未發(fā)現(xiàn)上述位點(diǎn)與兒童ALL發(fā)病相關(guān)。rs17015014-CC型與兒童B-ALL發(fā)病相關(guān),攜帶rs17015014-CC型女性兒童ALL發(fā)病風(fēng)險(xiǎn)增加;單倍型CACC與兒童急淋發(fā)病易感性相關(guān)。 2.攜帶rs10519613CC型或單倍型CATG的急淋患兒誘導(dǎo)緩解D15骨髓不緩解的發(fā)生風(fēng)險(xiǎn)增加。 3.單倍型AGTG在中高危組的分布頻率較在低危組低,提示攜帶該基因型的患兒預(yù)后相對較好。 4.高分辨率熔解曲線分析-非標(biāo)記探針法是對已知SNP位點(diǎn)突變研究的一種廉價(jià)、簡便、快速準(zhǔn)確的基因分型技術(shù)。
[Abstract]:Objective : Acute lymphoblastic leukemia ( ALL ) is the most common malignant tumor in childhood . The chemotherapy of ALL is based on individualized treatment based on different risk factors . Although multiple factors related to the prognosis of ALL have been identified , it is not clear that IL - 15 is associated with the pathogenesis and prognosis of ALL . It is found that IL - 15 is closely related to the pathogenesis and prognosis of ALL . It is found that IL - 15 is closely related to the pathogenesis and prognosis of ALL . It is found that rs177695 and rs10519612 are related to susceptibility to acute lymphoblastic leukemia in China .
High - resolution melting curve analysis is a high - throughput , accurate and low - cost genotyping technique in recent years , in which the non - labeled probe method is particularly suitable for genotyping of known SNPs sites .
Methods : In the case group , 173 patients with ALL were enrolled in the treatment regimen , 222 healthy children in the normal control group were genotyped by high - resolution melting curve - non - labeled probe method , and the genotype distribution difference and OR value were calculated by using the SHEsis online software and SPSS 17.0 statistical software .
Results :
1 . The non - labeled probe method is consistent with the results of gene sequencing typing , which can accurately classify the four sites involved in this study . On the other hand , in the absence of high - low - temperature internal standard , the small fragment amplification method cannot distinguish the wild homozygotes and the mutant pure and children .
2.rs17007695,rs35964658,rs10519613鍜宺s17015014鐨勭瓑浣嶅熀鍥犲拰鍩哄洜鍨嬪垎甯冨湪ALL緇勫拰瀵圭収緇勯棿鏃犲樊寮
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