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A targeted-replacement system for identification of signals for de novo methylation in Neurospora crassa.

机译:一种靶向置换系统,用于鉴定神经孢菌中从头甲基化的信号。

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Transformation of eukaryotic cells can be used to test potential signals for DNA methylation. This approach is not always reliable, however, because of chromosomal position effects and because integration of multiple and/or rearranged copies of transforming DNA can influence DNA methylation. We developed a robust system to evaluate the potential of DNA fragments to function as signals for de novo methylation in Neurospora crassa. The requirements of the system were (i) a location in the N. crassa genome that becomes methylated only in the presence of a bona fide methylation signal and (ii) an efficient gene replacement protocol. We report here that the am locus fulfills these requirements, and we demonstrate its utility with the identification of a 2.7-kb fragment from the psi 63 locus as a new portable signal for de novo methylation.
机译:真核细胞的转化可用于测试DNA甲基化的潜在信号。但是,由于染色体位置效应以及转化DNA的多个和/或重排拷贝的整合会影响DNA甲基化,因此该方法并不总是可靠的。我们开发了一个强大的系统来评估DNA片段在神经孢菌中作为从头甲基化信号发挥作用的潜力。该系统的要求是(i)仅在存在真实甲基化信号的情况下甲基化在克雷萨氏菌基因组中的位置和(ii)有效的基因替代方案。我们在这里报告说,am基因座满足了这些要求,并且通过从psi 63基因座鉴定出2.7 KB片段作为从头甲基化的新便携式信号,证明了其实用性。

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