title: Sequencing intractable DNA to close microbial genomes.
abstract: Advancement in high throughput DNA sequencing technologies has supported a rapid proliferation of microbial genome sequencing projects, providing the genetic blueprint for in-depth studies. Oftentimes, difficult to sequence regions in microbial genomes are ruled "intractable" resulting in a growing number of genomes with sequence gaps deposited in databases. A procedure was developed to sequence such problematic regions in the "non-contiguous finished" Desulfovibrio desulfuricans ND132 genome (6 intractable gaps) and the Desulfovibrio africanus genome (1 intractable gap). The polynucleotides surrounding each gap formed GC rich secondary structures making the regions refractory to amplification and sequencing. Strand-displacing DNA polymerases used in concert with a novel ramped PCR extension cycle supported amplification and closure of all gap regions in both genomes. The developed procedures support accurate gene annotation, and provide a step-wise method that reduces the effort required for genome finishing.
authors.affiliation: Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Hurt
authors.forename: Steven D
authors.initials: SD
authors.lastname: Brown
authors.forename: Mircea
authors.initials: M
authors.lastname: Podar
authors.forename: Anthony V
authors.initials: AV
authors.lastname: Palumbo
authors.forename: Dwayne A
authors.initials: DA
authors.lastname: Elias
mesh_terms: D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics*; D030541:Databases, Genetic; D045284:Desulfovibrio africanus / Q000235:genetics*; D045285:Desulfovibrio desulfuricans / Q000235:genetics*; D016680:Genome, Bacterial; D055029:Inverted Repeat Sequences; D058977:Molecular Sequence Annotation; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D017422:Sequence Analysis, DNA
chemical_list: D004269:DNA, Bacterial