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dandan_lan金蟲 (初入文壇)
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[求助]
干細胞方向的,幫我翻譯一下行嗎?
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While researchers have a viable means to correct the mutation in these iPS cells, other steps in the development of patient-specific therapeutic stem cells remain problematic. For example, recent studies have found that many mutations arise during reprogramming of somatic cells into iPS cells, a finding that Howden’s team confirmed in their study. To develop the tissue-specific regenerative capacity of the patient’s cell, researchers rewound the cell into a pluripotent state by overexpressing seven proteins—OCT4, SOX2, NANOG, LIN28, c-Myc, KLF4, and SV40 T-antigen—whose coding sequences reside on an episomal DNA. “We used the episomal reprogramming methods because the genes carried on episomes are extra-chromosomal which means that they don’t integrate into the chromosome,” Howden says. This reprogramming method left the genome intact. Now Howden and colleagues are obtaining biopsy samples from patients who have an autosomal dominant form of retinal dysfunction, hoping to continue reducing the number of mutations in the development of stem cells for clinical applications. The paper, “Genetic correction and analysis of induced pluripotent stem cells from a patient with gyrate atrophy,” was published 1 March 2011 in Proceedings of the National Academy of Sciences. |
鐵桿木蟲 (正式寫手)
有為青年
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雖然研究者能夠修正多能肝細胞的突變,然而病人專一性治療肝細胞在發(fā)育過程中仍然困難重重。例如,Howden的研究發(fā)現(xiàn),體細胞重新編程生成多能肝細胞的過程中會發(fā)生很多突變。 為了使病人細胞獲得組織專一性再生能力,研究者表達7個蛋白,即OCT4, SOX2, NANOG, LIN28, c-Myc, KLF4, and SV40 T-抗體(編碼序列在附加體DNA),使細胞出現(xiàn)多能狀態(tài)。 Howden說,“我們使用附加體重編程技術,是因為附加體上面的基因是染色體外的基因,不與染色體發(fā)生整合! 該技術不會破壞基因組的完整性。 現(xiàn)在Howden及同事從常染色體顯性遺傳形式的視網(wǎng)膜功能障礙患者身上獲得了活檢樣品,希望能夠繼續(xù)減少干細胞發(fā)育過程中突變的數(shù)量。 這篇文章“Genetic correction and analysis of induced pluripotent stem cells from a patient with gyrate atrophy”發(fā)表在2011年3月1日的PNAS雜志上。 |

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