2023年03月28日,美國(guó)西奈山伊坎醫(yī)學(xué)院James J. Manfredi團(tuán)隊(duì)通過(guò)對(duì)經(jīng)輻射處理的小鼠器官進(jìn)行聯(lián)合RNA測(cè)序(RNA-seq)和染色質(zhì)免疫沉淀測(cè)序(ChIP-seq)分析,鑒定出共有的和組織特異性p53轉(zhuǎn)錄反應(yīng),揭示了胸腺和脾臟共有的p53靶點(diǎn)富含凋亡靶點(diǎn)。且肝臟不能上調(diào)這些基因并不是因?yàn)榛蛘加新式档。小鼠模型?shí)驗(yàn)表明,p53的C末端缺失可導(dǎo)致肝內(nèi)p53凋亡靶點(diǎn)的輻射誘導(dǎo)表達(dá),并伴隨細(xì)胞死亡增加。全面的RNA-seq分析顯示,C末端在肝臟特異性p53靶點(diǎn)的轉(zhuǎn)錄激活中需要發(fā)揮額外作用。作者推測(cè),抑制凋亡基因表達(dá)和增強(qiáng)肝臟特異性靶點(diǎn)激活都會(huì)導(dǎo)致組織特異性放射抵抗。相關(guān)研究成果以“In vivo RNA-seq and ChIP-seq analyses show an obligatory role for the C terminus of p53 in conferring tissue-specific radiation sensitivity”為題發(fā)表在《Cell Reports》期刊(IF 8.8)。
參考文獻(xiàn): Resnick-Silverman L, Zhou R, Campbell MJ, Leibling I, Parsons R, Manfredi JJ. In vivo RNA-seq and ChIP-seq analyses show an obligatory role for the C terminus of p53 in conferring tissue-specific radiation sensitivity. Cell Rep. 2023 Mar 28;42(3):112216. pii: S2211-1247(23)00227-9. doi: 10.1016/j.celrep.2023.112216. PubMed PMID: 36924496.