Ca. Cooney et al., AN IMPROVED SAMPLE PREPARATION METHOD FOR THE QUANTITATIVE HPLC DETERMINATION OF 5-METHYLDEOXYCYTIDINE IN ANIMAL TISSUE DNA, Journal of liquid chromatography & related technologies, 20(8), 1997, pp. 1279-1293
Citations number
32
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
Techniques are presented for the purification of DNA from mammalian ti
ssues, its enzymatic hydrolysis to deoxyribonucleosides and the separa
tion and quantification of these by high pressure liquid chromatograph
y (HPLC). The method is used to quantify 5-methyldeoxycytidine (5MdC)
and deoxycytidine (dC) in DNA. From this data the molar %5MdC, i.e. 10
0 x 5MdC/(dC + 5MdC), is calculated for DNA. The precision of the meth
od matches or exceeds that of other published HPLC methods for quantif
ying the %5MdC. The DNA obtained is extremely clean, and the enzymatic
hydrolysis provides deoxyribonucleosides without contamination so the
re are no extraneous peaks in the region of interest, and peaks that a
re obtained have sufficient area to eliminate errors from variation in
integration. The %5MdC is a quantitative and absolute measure of the
genome wide DNA methylation. This method is suitable to quantify small
changes in mammalian enzymatic DNA methylation due to age, diet, drug
s or carcinogens.