The different mobility of complementary strands depends on the proportion AC/GT

Forensic Science International : Synergy
H SaitohM Kiuchi

Abstract

The electrophoretic mobility of DNA fragments on denaturing polyacrylamide gel depends on various factors. One of these is the base composition of a single-stranded DNA (ssDNA). We confirmed that one strand and its complementary strand of polymerase chain reaction (PCR) products migrated with different mobilities in all alleles detected at 12 out of the 13 short tandem repeat (STR) loci studied. The mobility differences between complementary strands (MD) were also observed regardless of end-polishing with Pfu DNA polymerase. MD was therefore not influenced by additional nucleotides to each strand of the PCR products. We then analyzed the relation between MD and the base composition using one representative allele at each of the 13 loci. The results indicated that MD was affected by the adenine plus cytosine (AC) content in the ssDNA and was proportional to the values of the AC content divided by the guanine plus thymine (GT) content in the AC-rich strand (the proportion AC/GT). When the proportion AC/GT was well-balanced, MD decreased. The same tendency was observed even in the end-polished strands. In this study, the electrophoretic mobility of an ssDNA on denaturing polyacrylamide gels was shown to depend on the proportion AC...Continue Reading

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Citations

Dec 10, 2013·Forensic Science International. Genetics·S DalsgaardN Morling
Jun 27, 2007·Nucleic Acids Research·Achim FischerLeo Gaelweiler
Feb 6, 2013·The American Journal of Tropical Medicine and Hygiene·Míriam Tomás-PérezCristina Riera
Jan 6, 2011·Genetic Testing and Molecular Biomarkers·Jan RadvanskyLudevit Kadasi
Jun 29, 1999·Analytical Chemistry·T A BrettellR Saferstein

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