開(kāi)放染色質(zhì)定位檢測(cè)(ATAC-seq)
發(fā)稿時(shí)間:2019-03-27來(lái)源:天昊生物
1. 服務(wù)介紹
真核生物的染色質(zhì)通常情況下以核小體為單位進(jìn)行致密的折疊,不表現(xiàn)出轉(zhuǎn)錄活性,同時(shí)部分開(kāi)放的染色質(zhì)區(qū)域作為特異性反式作用因子(如轉(zhuǎn)錄因子、酶等)和順式作用元件(如增強(qiáng)子、絕緣子等)與基因組DNA相互作用的活躍區(qū)域。這種由染色質(zhì)的開(kāi)放程度定義的染色質(zhì)可接近性(Chromatin Accessibility)對(duì)細(xì)胞的基因的表達(dá),DNA的復(fù)制和修復(fù)等生命活動(dòng)產(chǎn)生重要的影響,并且時(shí)刻受到細(xì)胞的嚴(yán)格調(diào)控。因此檢測(cè)特定時(shí)空狀態(tài)下細(xì)胞染色質(zhì)的開(kāi)放程度(從關(guān)閉狀態(tài)到半開(kāi)放,從半開(kāi)放到完全開(kāi)放),是探索染色質(zhì)結(jié)構(gòu)重塑(Chromatin Remodeling)對(duì)生物的生長(zhǎng)發(fā)育、疾病的發(fā)生發(fā)展影響的重要研究方向。
ATAC-seq(Assay for Transposase-Accessible Chromatin using sequencing)方法利用高靈敏度的轉(zhuǎn)座酶(Transposase,Tn5)在尋找染色質(zhì)上可接近位置的同時(shí)對(duì)染色質(zhì)DNA進(jìn)行片段化和接頭連接,進(jìn)而進(jìn)行高通量測(cè)序。細(xì)胞需求量在50000個(gè)左右,更適合數(shù)量有限的臨床和珍貴樣本,實(shí)驗(yàn)操作上更方便快捷,是一種創(chuàng)新的單堿基分辨率的表觀遺傳學(xué)研究技術(shù)。目前該技術(shù)已被廣泛應(yīng)用于揭示染色質(zhì)豐富的表觀調(diào)控信息、不同狀態(tài)下開(kāi)放染色質(zhì)的變化,以及多種疾病中開(kāi)放染色質(zhì)圖譜的繪制等,同樣適用于真核細(xì)胞重編程及單細(xì)胞染色質(zhì)開(kāi)放性的研究,在醫(yī)學(xué)領(lǐng)域是重大疾病發(fā)病機(jī)制、藥物作用機(jī)制、新藥研發(fā)和生物標(biāo)志物等研究的重要利器。◆
2. 技術(shù)優(yōu)勢(shì)
-
低細(xì)胞量需求:細(xì)胞量需求少,適合數(shù)量有限的臨床和珍貴樣本。
-
高性?xún)r(jià)比:實(shí)驗(yàn)耗時(shí)短,實(shí)驗(yàn)安排靈活,僅需較少數(shù)據(jù)量獲得全基因組范圍內(nèi)有效調(diào)控信息。
-
全基因組覆蓋:全基因組范圍單堿基水平對(duì)染色質(zhì)開(kāi)放區(qū)域進(jìn)行篩選與鑒定。
-
高精確率:精確捕獲開(kāi)放染色質(zhì)區(qū)域,獲得調(diào)控序列信息,可同時(shí)對(duì)核小體信息進(jìn)行研究。
3. 技術(shù)參數(shù)
4. 技術(shù)路線及分析流程
5. 數(shù)據(jù)展示
ATAC-seq片段大小揭示核小體位置信息
轉(zhuǎn)錄起始位點(diǎn)為中心的上下游2kb區(qū)域信號(hào)分布
差異peak可視化信息
6. 應(yīng)用領(lǐng)域
開(kāi)放性染色質(zhì)圖譜繪制
-
The chromatin accessibility landscape of primary human cancers, 2018, Science.(泛癌種開(kāi)放性染色質(zhì)圖譜,結(jié)合TCGA多組學(xué)數(shù)據(jù))
-
An atlas of chromatin accessibility in the adult human brain, 2018, Genome Reserch.(腦細(xì)胞中開(kāi)放性染色質(zhì)圖譜)
-
Comprehensive epigenetic landscape of rheumatoid arthritis fibroblast-like synoviocytes, 2018, Nature Communications.(RA中表觀多組學(xué)圖譜)
開(kāi)放性染色質(zhì)動(dòng)態(tài)變化
-
ATAC-Seq analysis reveals a widespread decrease of chromatin accessibility in age-related macular degeneration, 2018, Nature Communications.(黃斑變性染色質(zhì)開(kāi)放性改變)
-
Epigenetic and transcriptomic profiling of mammary gland development and tumor models disclose regulators of cell state plasticity, 2018, Cancer Cell.(乳房發(fā)育過(guò)程中表觀及轉(zhuǎn)錄組變化)
尋找轉(zhuǎn)錄因子及結(jié)合位點(diǎn)
-
Analysis of chromatin accessibility uncovers TEAD1 as a regulator of migration in human glioblastoma, 2018, Nature Communications.(惡性膠質(zhì)瘤干細(xì)胞)
-
Nfib promotes metastasis through a widespread increase in chromatin accessibility, 2016, Cell.(小細(xì)胞肺癌轉(zhuǎn)移)
動(dòng)植物ATAC-seq
-
Chromatin accessibility dynamics across C. elegans development and ageing, 2018, eLife.(線蟲(chóng)發(fā)育和衰老過(guò)程中染色質(zhì)開(kāi)放性改變)
-
Patterns of chromatin accessibility along the anterior-posterior axis in the early Drosophila embryo, 2018, PLoS Genetics.(果蠅胚胎早期染色質(zhì)開(kāi)放性研究)
-
The landscape of accessible chromatin in mammalian preimplantation embryos, 2016, Nature.(哺乳動(dòng)物植入前胚胎開(kāi)放性染色質(zhì)圖譜)
-
Chromatin accessibility changes between Arabidopsis stem cells and mesophyll cells illuminate cell type-specific transcription factor networks, 2018, Plant Journal.(擬南芥干細(xì)胞和葉肉細(xì)胞染色質(zhì)可及性作用)
-
Profiling of accessible chromatin regions across multiple plant species and cell types reveals common gene regulatory principles and new control modules, 2018, Plant Cell.(植物染色質(zhì)可及性圖譜揭示基因調(diào)控原則)
-
Combining ATAC-seq with nuclei sorting for discovery of cis-regulatory regions in plant genomes, 2017, Nucleic Acids Research.(植物染色質(zhì)可及性檢測(cè)發(fā)現(xiàn)順式調(diào)控區(qū)域)