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It is frequently useful to determine the methylation state of samples containing limited amounts of DNA such as from embryos, or from fixed tissue samples in which DNA is degraded or difficult to isolate. By modification of the standard protocols for DNA preparation and bisulfite treatment, it is possible to obtain DNA methylation sequence data for such samples. We present methods for bisulfite treatment...
A large body of data point toward 5-cytosine DNA methyltransferase 1 (DNMT1) as a critical component of oncogenic programs. The study of the role of DNMT1 in cancer has been hindered by the lack of specific inhibitors. A different approach to study the role of DNMT1 in cancer is to use sequence-specific antisense oligonucleotides against DNMT1 mRNA. This paper discusses methods used to identify sequence-specific...
The idea of modifying DNA with bisulfite has paved the way for a variety of polymerase chain reaction (PCR) methods for accurately mapping 5-methylcytosine at specific genes. Bisulfite selectively deaminates cytosine to uracil under conditions where 5-methylcytosine remains unreacted. Following conventional PCR amplification of bisulfite-treated DNA, original cytosines appear as thymine while 5-methylcytosines...
The development of multiple DNA methylation analysis techniques, including higher-throughput assays, has resulted in data structures of increasing complexity and diversity. Here, we discuss the general principles of DNA methylation analysis and propose a nomenclature for the various types of methylation analysis. We briefly outline several DNA methylation analysis techniques and discuss how these...
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