DNA sequencing with dye-labeled terminators and T7 DNA polymerase: effect of dyes and dNTPs on incorporation of dye-terminators and probability analysis of termination fragments.
AUTOR(ES)
Lee, L G
RESUMO
The incorporation of fluorescently labeled dideoxynucleotides by T7 DNA polymerase is optimized by the use of Mn2+, fluorescein analogs and four 2'-deoxyribonucleoside 5'-O-(1-thiotriphosphates) (dNTP alpha S's). The one-tube extension protocol was tested on single-stranded templates, as well as PCR fragments which were made single-stranded by digestion with T7 gene 6 exonuclease. Dye primer sequencing using four dNTP alpha S's was shown to give uniform termination patterns which were comparable to four dNTPs. Efficiency of the polymerase also appeared to improve with the dNTP alpha S's. A mathematical model was developed to predict the pattern of termination based on enzyme activity and ratios of ddNTP/dNTPs. This method can be used to optimize sequencing reactions and to estimate enzyme discrimination constants of chain terminators.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=312381Documentos Relacionados
- New dye-labeled terminators for improved DNA sequencing patterns.
- Fluorescence energy transfer dye-labeled primers for DNA sequencing and analysis.
- Synthesis and application of charge-modified dye-labeled dideoxynucleoside-5′-triphosphates to ‘direct-load’ DNA sequencing
- Rapid purification of fluorescent dye-labeled products in a 96-well format for high-throughput automated DNA sequencing.
- Bacteriophage T7 DNA polymerase: cloning and high-level expression.
