High-resolution separation and accurate size determination in pulsed-field gel electrophoresis of DNA. 1. DNA size standards and the effect of agarose and temperature

• Published in: Biochemistry (Easton) Vol. 27; no. 26; pp. 9204 - 9210
• Main Authors: Mathew, Mathew K, Smith, Cassandra L, Cantor, Charles R
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 27.12.1988
• Subjects: 550200 - Biochemistry; BACTERIOPHAGES; Bacteriophages - genetics; BASIC BIOLOGICAL SCIENCES; CALIBRATION STANDARDS; CARBOHYDRATES; DNA; DNA, Fungal - isolation & purification; DNA, Viral - isolation & purification; ELECTRIC FIELDS; ELECTROPHORESIS; Electrophoresis - methods; Electrophoresis, Agar Gel - methods; EUMYCOTA; FUNGI; MASS TRANSFER; MICROORGANISMS; Molecular Weight; NUCLEIC ACIDS; ORGANIC COMPOUNDS; PARASITES; PLANTS; POLYSACCHARIDES; Reference Standards; SACCHARIDES; SACCHAROMYCES; SACCHAROMYCES CEREVISIAE; Saccharomyces cerevisiae - genetics; SIZE; Temperature; TEMPERATURE EFFECTS; VIRUSES; YEASTS
• ISSN: 0006-2960; 1520-4995
• DOI: 10.1021/bi00426a019

Pulsed-field gel electrophoresis (PGF) subjects DNA alternately to two electrical fields to resolve DNA ranging from 10,000 base pairs (10 kb) to 10,000 kb in size. The separations are quite sensitive to a variety of experimental variables. This makes it critical to have a wide range of reliable size standards. A technique is described for preparing mixtures of bacteriophage DNA oligomers that span a size range from monomer to more than 30-mer. The relationship between size and mobility of oligomers of different bacteriophage DNA monomers is generally self-consistent. Thus, these samples can serve as primary length standards for DNAs ranging from 10 kb to more than 1500 kb. They have been used to estimate the size of the chromosomal DNAs from various Saccharomyces cerevisiae strains and to test the effect of gel concentration and temperature on PFG. DNA resolution during PFG is slightly improved in agarose gels with small pore sizes, in contrast to continuous electrophoresis where the opposite is observed. PFG mobility is surprisingly sensitive to changes in the running temperature.