Draft Genome Sequence of Campylobacter coli Strain IPSID-1 Isolated from a Patient with Immunoproliferative Small Intestinal Disease

Abstract

The genome sequence and annotation of Campylobacter coli strain IPSID-1 are reported here. This bacterial isolate is the first to be cultured from a patient with immunoproliferative small intestinal disease (IPSID). The draft genome sequence is 1.683 Mb long, comprises 64 contigs, and has 31.26% G+C content.

GENOME ANNOUNCEMENT

Gram-negative bacteria of the genus Campylobacter are often implicated in human and animal diseases, including enteritis, abortion, and septicemia. Campylobacter jejuni and Campylobacter coli are the medically most important species of the genus (1). Based on 16S rRNA gene sequencing, in situ hybridization, and immunohistochemistry, Campylobacter spp. have also been associated with immunoproliferative small intestinal disease (IPSID), a rare variant of B-cell mucosa-associated lymphoid tissue (MALT) lymphoma of the small intestine, characterized by the synthesis of a monotypic truncated immunoglobulin alpha heavy chain lacking an associated light chain (2, 3, 4). Recently, C. coli was isolated from the stool of a patient with ileocecal IPSID (5). Here, we report the draft genome sequence of this IPSID-associated C. coli strain, IPSID-1.

Whole-genome shotgun sequencing was performed using an Illumina HiSeq 2000 sequencer. Libraries were constructed using Nextera technology and sequenced using a 2 × 100 nucleotide paired-end strategy, leading to ~10,585,000 paired-read sequences. All reads were preprocessed to remove low-quality or artifactual bases. Library adapters, as well as base pairs occurring at 5′ and 3′ ends and supported by a Phred quality score <20, were trimmed off using AlienTrimmer (6). Reads of length <95 bp after the above cleaning steps were discarded, as well as those containing >20% bp with a Phred score of <20. Finally, the program fqduplicate (ftp://ftp.pasteur.fr/pub/gensoft/projects/fqtools) was used to discard every duplicate paired-end read. The remaining reads (~6,682,000 paired-end and ~2,176,000 single-end) were assembled using clc_assembler (version 4.10.86742) from the CLC Genomics Workbench analysis package (http://www.clcbio.com/products/clc-genomics-workbench/), with contig sequences of <500 nucleotides being discarded and with a de Bruijn graph k-mer parameter value of 57, which maximized the N₅₀, N₇₅, and N₉₀ values (i.e., 302,476, 162,145, and 45,795 bp, respectively).

A total of 64 contigs organized into 38 scaffolds were obtained, with a total length of 1,683,384 bp. An average coverage depth of ~920× was obtained. The G+C content of the genome sequence is 31.26%. The sequences were submitted to the RAST server (7) for gene prediction and annotation, which led to 1,766 protein-coding sequences, 40 detected tRNA genes, and 3 rRNA regions. Extraction of gene sequences corresponding to the Campylobacter multilocus sequence typing scheme (8) showed that IPSID-1 belongs to sequence type 4956 (ST-4956), which is associated with clonal complex 828. The genome comprises genes homologous to the cdtABC cluster, coding for cytolethal distending toxin (9, 10).

The availability of the draft genome sequence of C. coli IPSID-1, the first Campylobacter isolate from a case of IPSID, will contribute to a better understanding of the pathophysiological mechanisms of this disease.

Nucleotide sequence accession numbers.

This whole-genome shotgun project has been deposited at DDBJ/EMBL/GenBank under the accession no. CBXC000000000. The version described in this paper is the first version, CBXC01000000.