Penn N W, Suwalski R, O'Riley C, Bojanowski K, Yura R
Biochem J. 1972 Feb;126(4):781-90. doi: 10.1042/bj1260781.
A method is given for small-scale preparation of DNA from 1.0-1.5g of adult rat tissues. The product from brain or liver is characterized by base ratios and phosphorus content which accord with reported values for rat tissue. It is reasonably free of RNA, protein and glycogen. It contains 5-hydroxymethylcytosine at a content of about 15% of the total cytosine bases present. 5-Hydroxymethylcytosine is also demonstrable in mouse and frog brain DNA and in the crude cytidylic acid fractions obtained from RNA hydrolysates of rat brain and liver. 5-Hydroxymethylcytosine is identified by paper chromatography, u.v. spectra in acid and alkaline solutions and by its conversion into 5-hydroxymethyluracil.
本文给出了一种从小鼠脑组织制备RNA的方法。该方法包括用含0.5%十二烷基硫酸钠的缓冲液匀浆脑组织,然后用热酚抽提,再用乙醇沉淀RNA。从脑、肝组织中提取的RNA产物,经碱基比例和磷含量分析,其结果与报道的大鼠组织RNA值相符。该RNA制品不含DNA、蛋白质和糖原。用大鼠肝RNA水解物制备的粗胞苷酸级分中也含有5-羟甲基胞嘧啶。5-羟甲基胞嘧啶是通过纸层析、酸碱溶液中的紫外光谱以及它转化为5-羟甲基尿嘧啶来鉴定的。