title: "Doublex" fluorescent DNA sequencing: two independent sequences obtained simultaneously in one reaction with internal labeling and unlabeled primers.
abstract: The novel "doublex" DNA sequencing technique that makes it possible to obtain simultaneously two independent sequences from one sequencing reaction with the use of unlabeled primers and internal labeling is described. The different sequencing products are labeled in parallel with fluorescein-15-dATP and Texas red-5-dCTP present in the same tube. The characteristics of T7 DNA polymerase are exploited to ensure that only either of the labeled dNTPs is incorporated into the corresponding sequencing products. Specificity of labeling is ensured by the selection of primers. One of the unlabeled primers is chosen to be followed by an "A," the other by a "C" to be incorporated immediately downstream from the primer binding site. The doublex sequencing technique is applicable to the simultaneous sequencing of either the same DNA template/strand or a mixture of different templates. Combinations of unlabeled and labeled primers in the same sequencing reaction are also possible. The two sequences can be determined in parallel and on-line in the same lanes of a gel with a novel automated DNA sequencer, which was previously described for use with labeled primers.
authors.affiliation: Biochemical Instrumentation, European Molecular Biology Laboratory, Heidelberg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Wiemann
authors.forename: J
authors.initials: J
authors.lastname: Stegemann
authors.forename: J
authors.initials: J
authors.lastname: Zimmermann
authors.forename: H
authors.initials: H
authors.lastname: Voss
authors.forename: V
authors.initials: V
authors.lastname: Benes
authors.forename: W
authors.initials: W
authors.lastname: Ansorge
mesh_terms: D001322:Autoanalysis / Q000295:instrumentation*; D001483:Base Sequence; D004247:DNA / Q000737:chemistry*; D017931:DNA Primers; D004259:DNA-Directed DNA Polymerase / Q000737:chemistry; D003838:Deoxyadenine Nucleotides; D003845:Deoxycytosine Nucleotides; D043211:Exodeoxyribonuclease V; D005090:Exodeoxyribonucleases / Q000737:chemistry; D005452:Fluoresceins; D005456:Fluorescent Dyes; D008969:Molecular Sequence Data; D013698:Templates, Genetic; D014966:Xanthenes
chemical_list: D017931:DNA Primers; D003838:Deoxyadenine Nucleotides; D003845:Deoxycytosine Nucleotides; D005452:Fluoresceins; D005456:Fluorescent Dyes; C101260:Texas Red-5-dCTP; D014966:Xanthenes; C094501:fluorescein-15-deoxyadenosine triphosphate; D004247:DNA; C034970:bacteriophage T7 induced DNA polymerase; D004259:DNA-Directed DNA Polymerase; D005090:Exodeoxyribonucleases; D043211:Exodeoxyribonuclease V