Genometrics as an essential tool for the assembly of whole genome sequences: the example of the chromosome of Bifidobacterium longum NCC2705.

Details

Ressource 1Download: BIB_690A08C97CD8.P001.pdf (472.29 [Ko])
State: Public
Version: author
Serval ID
serval:BIB_690A08C97CD8
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Genometrics as an essential tool for the assembly of whole genome sequences: the example of the chromosome of Bifidobacterium longum NCC2705.
Journal
BMC Microbiology
Author(s)
Guy L., Karamata D., Moreillon P., Roten C.A.
ISSN
1471-2180[electronic], 1471-2180[linking]
Publication state
Published
Issued date
2005
Volume
5
Pages
60
Language
english
Abstract
BACKGROUND: Analysis of the first reported complete genome sequence of Bifidobacterium longum NCC2705, an actinobacterium colonizing the gastrointestinal tract, uncovered its proteomic relatedness to Streptomyces coelicolor and Mycobacterium tuberculosis. However, a rapid scrutiny by genometric methods revealed a genome organization totally different from all so far sequenced high-GC Gram-positive chromosomes. RESULTS: Generally, the cumulative GC- and ORF orientation skew curves of prokaryotic genomes consist of two linear segments of opposite slope: the minimum and the maximum of the curves correspond to the origin and the terminus of chromosome replication, respectively. However, analyses of the B. longum NCC2705 chromosome yielded six, instead of two, linear segments, while its dnaA locus, usually associated with the origin of replication, was not located at the minimum of the curves. Furthermore, the coorientation of gene transcription with replication was very low. Comparison with closely related actinobacteria strongly suggested that the chromosome of B. longum was misassembled, and the identification of two pairs of relatively long homologous DNA sequences offers the possibility for an alternative genome assembly proposed here below. By genometric criteria, this configuration displays all of the characters common to bacteria, in particular to related high-GC Gram-positives. In addition, it is compatible with the partially sequenced genome of DJO10A B. longum strain. Recently, a corrected sequence of B. longum NCC2705, with a configuration similar to the one proposed here below, has been deposited in GenBank, confirming our predictions. CONCLUSION: Genometric analyses, in conjunction with standard bioinformatic tools and knowledge of bacterial chromosome architecture, represent fast and straightforward methods for the evaluation of chromosome assembly.
Keywords
Bifidobacterium/genetics, Chromosomes, Bacterial, Genetic Techniques, Genome, Bacterial, Molecular Sequence Data, Open Reading Frames, Sequence Alignment, Software
Pubmed
Web of science
Open Access
Yes
Create date
24/01/2008 14:07
Last modification date
20/08/2019 14:24
Usage data