重性精神障礙谷氨酸能系統(tǒng)相關(guān)基因的分子遺傳學(xué)及功能影像學(xué)研究
發(fā)布時(shí)間:2019-01-21 14:21
【摘要】:研究背景: 精神分裂癥和重性抑郁障礙(Major Depression, MDD)是兩種常見(jiàn)的重性精神障礙。大量的研究表明遺傳因素在其發(fā)病中起到重要的作用,識(shí)別重性精神障礙的易感基因是當(dāng)前該研究領(lǐng)域的關(guān)鍵問(wèn)題之一。越來(lái)越多的研究表明谷氨酸能系統(tǒng)在重性精神障礙的發(fā)生中起到重要的作用。 由于臨床癥狀復(fù)雜,存在多個(gè)微效基因及基因—環(huán)境的相互作用,目前重性精神障礙的遺傳學(xué)研究普遍存在結(jié)果的重復(fù)性較差的問(wèn)題。內(nèi)表型概念的引入,降低了表型多樣性困擾,促進(jìn)其易感基因的發(fā)現(xiàn)。研究表明通過(guò)功能磁共振成像(functional Magnetic Resonance Imaging, fMRI)發(fā)現(xiàn)的腦影像學(xué)改變是重性精神障礙可靠的內(nèi)表型。 目的: 尋找精神分裂癥及MDD特異的腦影像學(xué)改變;驗(yàn)證谷氨酸能系統(tǒng)相關(guān)基因與精神分裂癥及MDD疾病易感性及其腦影像學(xué)改變的相關(guān)性。 研究?jī)?nèi)容:本研究主要開(kāi)展了以下三方面的內(nèi)容: 1、應(yīng)用“病例-對(duì)照”關(guān)聯(lián)研究的方法分析了14個(gè)谷氨酸能系統(tǒng)相關(guān)基因的43個(gè)SNPs位點(diǎn)與精神分裂癥及MDD的相關(guān)性。首先在96例對(duì)照及96例精神分裂癥樣本中對(duì)所選SNPs位點(diǎn)進(jìn)行初篩,然后分別在480例對(duì)照、454例精神分裂癥患者及488例MDD患者中對(duì)初篩得到的陽(yáng)性易感基因進(jìn)行驗(yàn)證。 2、精神分裂癥及MDD的fMRI研究。 分別收集精神分裂癥患者、MDD患者及對(duì)照被試共三組被試靜息及任務(wù)態(tài)fMRI掃描數(shù)據(jù)。對(duì)靜息態(tài)數(shù)據(jù),研究局部一致性(Regional Homogeneity, ReHo)及默認(rèn)網(wǎng)絡(luò)(Default Mode Network, DMN)的差異;在任務(wù)態(tài)fMRI的研究中,采用n-back范式研究三組被試工作記憶行為學(xué)及腦影像學(xué)改變的差異。 3、谷氨酸能系統(tǒng)相關(guān)基因在精神分裂癥及MDD患者腦影像學(xué)改變中的作用。 在前兩部分工作上的基礎(chǔ)上,以關(guān)聯(lián)分析中得到的陽(yáng)性位點(diǎn)為分組標(biāo)準(zhǔn),根據(jù)基因分型結(jié)果將三組被試分為不同的亞組,在不同的亞組之間研究其腦影像學(xué)的差異,探索陽(yáng)性易感基因?qū)颊吣X影像學(xué)改變的作用及其作用模式。 結(jié)果: 1、關(guān)聯(lián)分析表明D-型氨基酸氧化酶激活劑(D-Amino acid Oxidase Activator, DAOA)基因與精神分裂癥及MDD相關(guān)。其中rs2391191(M15)、rs3918341(M16)、rs778294(M19)三點(diǎn)及M15的基因型分布在MDD患者及對(duì)照中出現(xiàn)明顯的差異。多個(gè)兩點(diǎn)及三位點(diǎn)組成的單倍型與精神分裂癥及MDD的疾病易感性顯著相關(guān)。 2、(1)與對(duì)照組相比,精神分裂癥患者組右側(cè)額上回ReHo升高,左側(cè)顳上回ReHo降低,額上回存在著ReHo值左側(cè)小于右側(cè)的現(xiàn)象; (2)在DMN分析中發(fā)現(xiàn),與對(duì)照組相比,精神分裂癥患者組在雙側(cè)枕中回活動(dòng)增強(qiáng),而MDD患者組在左側(cè)額下回、島葉及右側(cè)額中回活動(dòng)減弱; (3)精神分裂癥患者組與對(duì)照組n-back實(shí)驗(yàn)的行為學(xué)表現(xiàn)存在顯著差異,但未發(fā)現(xiàn)兩組存在活動(dòng)顯著差異的腦區(qū); (4)靜息狀態(tài)下,精神分裂癥患者組相對(duì)于對(duì)照組在楔葉、海馬、枕下回和顳中回的中間度(Betweenness)出現(xiàn)顯著差異;而在2-back任務(wù)狀態(tài)下,患者功能連接的數(shù)目減少,楔葉、枕中回及頂上回的中間度異常。 3、根據(jù)SNP rs2391191(M15)位點(diǎn)將被試分為AA基因型組及G+基因型組。結(jié)果顯示在MDD患者的右側(cè)小腦蚓部山頂及額中回、精神分裂癥患者的左側(cè)豆?fàn)詈舜嬖贛15位點(diǎn)的基因型主效應(yīng),而在MDD患者左側(cè)小腦蚓垂區(qū)及左側(cè)顳中回、精神分裂癥患者左側(cè)楔葉存在基因型與疾病狀態(tài)的交互作用。 結(jié)論: 谷氨酸能系統(tǒng)可能在精神分裂癥及MDD的發(fā)病及其特異的腦影像學(xué)改變中發(fā)揮重要作用。相同易感基因(DAOA基因)通過(guò)不同位點(diǎn)或位點(diǎn)的組合與精神分裂癥及MDD的疾病易感性相關(guān),并導(dǎo)致不同精神障礙患者腦影像學(xué)出現(xiàn)特異的改變。
[Abstract]:Study Background: Schizophrenia and heavy depressive disorder (MDD) are two common heavy mental barriers A large number of studies have shown that the genetic factors play an important role in the pathogenesis of the disease, and the sensitive gene for identifying the heavy mental disorder is the key problem in the current research field. One. More and more studies have shown that the glutamate energy system plays an important role in the occurrence of heavy mental disorders. Because of the complex clinical symptoms, there are multiple micro-effect genes and the interaction between the gene and the environment, and the genetic research of the current heavy mental disorder has a poor repeatability. The introduction of the concept of the internal phenotype reduces the problem of phenotypic diversity and promotes its susceptibility to gene expression. The findings of the study show that the brain imaging changes found by functional magnetic resonance imaging (fMRI) are reliable for heavy mental disorders. internal phenotype Objective: To find the brain imaging changes of schizophrenia and MDD, and to verify the susceptibility of the related genes to the system related to the treatment of schizophrenia and MDD and their brain images. The relevance of study change. Research content: the main development of this study The contents of the following three aspects are: 1. Analysis of 43 SNPs site and spirit of 14 glutamic acid energy system related genes by using the method of 鈥淐ase-Control鈥,
本文編號(hào):2412736
[Abstract]:Study Background: Schizophrenia and heavy depressive disorder (MDD) are two common heavy mental barriers A large number of studies have shown that the genetic factors play an important role in the pathogenesis of the disease, and the sensitive gene for identifying the heavy mental disorder is the key problem in the current research field. One. More and more studies have shown that the glutamate energy system plays an important role in the occurrence of heavy mental disorders. Because of the complex clinical symptoms, there are multiple micro-effect genes and the interaction between the gene and the environment, and the genetic research of the current heavy mental disorder has a poor repeatability. The introduction of the concept of the internal phenotype reduces the problem of phenotypic diversity and promotes its susceptibility to gene expression. The findings of the study show that the brain imaging changes found by functional magnetic resonance imaging (fMRI) are reliable for heavy mental disorders. internal phenotype Objective: To find the brain imaging changes of schizophrenia and MDD, and to verify the susceptibility of the related genes to the system related to the treatment of schizophrenia and MDD and their brain images. The relevance of study change. Research content: the main development of this study The contents of the following three aspects are: 1. Analysis of 43 SNPs site and spirit of 14 glutamic acid energy system related genes by using the method of 鈥淐ase-Control鈥,
本文編號(hào):2412736
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