Open Access

Non contiguous-finished genome sequence and description of Dielma fastidiosa gen. nov., sp. nov., a new member of the Family Erysipelotrichaceae

  • Dhamodharan Ramasamy1,
  • Jean-Christophe Lagier1,
  • Thi Tien Nguyen1,
  • Didier Raoult1 and
  • Pierre-Edouard Fournier1Email author
Standards in Genomic Sciences20138:8020336

https://doi.org/10.4056/sigs.3567059

Published: 15 June 2013

Abstract

Dielma fastidiosa strain JC13T gen. nov., sp. nov. is the type strain of D. fastidiosa gen. nov., sp. nov., the type species of a new genus within the family Erysipelotrichaceae. This strain, whose draft genome is described here, was isolated from the fecal flora of a healthy 16-year-old male Senegalese volunteer. D. fastidiosa is a Gram-negative anaerobic rod. Here we describe the features of this organism, together with the complete genome sequence and annotation. The 3,574,031 bp long genome comprises a 3,556,241-bp chromosome and a 17,790-bp plasmid. The chromosome contains 3,441 protein-coding and 50 RNA genes, including 3 rRNA genes, whereas the plasmid contains 17 protein-coding genes.

Keywords

Dielma fastidiosa Genome Culturomics Taxono-genomics

Introduction

Dielma fastidiosa strain JC13T (CSUR P149 / DSM 26099) is the type strain of D. fastidiosa gen. nov., sp. nov., the type species of Dielma gen. nov. This bacterium is a Gram-negative, anaerobic, catalase and indole-negative bacillus, isolated from the stool of a healthy Senegalese patient as part of a study aimed at cultivating individually all species within human feces [1,2]. The conventional genotypic methods used in bacterial taxonomy include 16S rRNA gene-based phylogeny and nucleotide similarity [3,4], determination of the G + C content and DNA-DNA hybridization (DDH) [5,6]. Although DDH and 16S rRNA gene similarity cutoffs are considered as gold standards in bacterial taxonomy, they have some limitations as they do not apply well to all species or genera [3]. Hence, there is a need for alternative methods. The introduction of high-throughput genome sequencing and proteomic analyses [7] provided a source of comprehensive information about studied bacterial isolates. Such data may now be included among the criteria used for taxonomic identification. We recently proposed to use a polyphasic approach to describe new bacterial taxa that is based on their genome sequence, MALDI-TOF spectrum and main phenotypic characteristics [826].

Here we present a summary classification and a set of features for D. fastidiosa gen. nov., sp. nov. strain JC13T (CSUR P149 / DSM 26099) together with the description of the complete genome sequencing and annotation. These characteristics support the circumscription of the genus Dielma and its type species, D. fastidiosa within the family Erysipelotrichaceae.

The family Erysipelotrichaceae was created in 2004 [27] and includes the 10 following genera: Allobaculum [28], Bulleidia [29], Catenibacterium [30], Coprobacillus (Kageyama and Benno 2000) [30], Eggerthia [31], Erysipelothrix [32], Holdemania [33], Kandleria [31], Solobacterium [30] and Turicibacter [34]. Currently, 12 species with validly published names are reported in this family [35]. The species listed in the Erysipelotrichaceae are mostly comprised of Gram-positive, non-spore forming, rod-shaped, straight or slightly curved or irregularly shaped, facultatively anaerobic or anaerobic, catalase negative, chemoorganotrophic fermentative or respiratory metabolism, acidifying glucose and other sugars [35]. Members of species within the radiation of Erysipelotrichaceae were identified as pathogens in both humans and animals. In humans, these bacteria were isolated from patients with oral infection and acute appendicitis [3640].

Classification and features

A stool sample was collected from a healthy 16-year-old male Senegalese volunteer patient living in Dielmo (rural village in the Guinean-Sudanian zone in Senegal), who was included in a research protocol. Written assent was obtained from this individual. For this study, no written consent was needed from his guardians because he was older than 15 years (in accordance with the previous project approved by the Ministry of Health of Senegal and the assembled village population and as published elsewhere [41].) Both this study and the assent procedure were approved by the National Ethics Committee of Senegal (CNERS) and the Ethics Committee of the Institut Fédératif de Recherche IFR48, Faculty of Medicine, Marseille, France (agreement numbers 09-022 and 11-017 Several other new bacterial species were isolated from this specimen using various culture conditions, including the recently described Alistipes senegalensis, Alistipes timonensis, Anaerococcus senegalensis,Clostridium senegalense, Peptoniphilus timonensis, Paenibacillus senegalensis, Herbaspirillum massiliense, Kurthia massiliensis, Brevibacterium senegalense, Aeromicrobium massilense, Cellulomonas massiliensis, Senegalemassilia anaerobia, Peptoniphilus senegalensis and Enterobacter massiliensis [920,23].

The fecal specimen was preserved at −80°C after collection. Strain JC13 T (Table 1) was isolated in January 2011 by cultivation on Brain Heart Infusion agar (Becton Dickinson, Pont de Claix, France), after a 10 day preincubation in anaerobic blood culture bottle.
Table 1.

Classification and general features of Dielma fastidiosa strain JC13T

MIGS ID

Property

Term

Evidence codea

 

Current classification

Domain Bacteria

TAS [42]

 

Phylum Firmicutes

TAS [4345]

 

Class Erysipelotrichia

TAS [46,47]

 

Order Erysipelotrichales

TAS [47,48]

 

Family Erysipelotrichaceae

TAS [27]

 

Genus Dielma

IDA

 

Species Dielma fastidiosa

IDA

 

Type strain JC13 T

IDA

 

Gram stain

Negative

IDA

 

Cell shape

Rod

IDA

 

Motility

Motile

IDA

 

Sporulation

Non-sporulating

IDA

 

Temperature range

Mesophile

IDA

 

Optimum temperature

37°C

IDA

MIGS-6.3

Salinity

Unknown

IDA

MIGS-22

Oxygen requirement

Anaerobic

IDA

 

Carbon source

Unknown

 
 

Energy source

Unknown

 

MIGS-6

Habitat

Human gut

IDA

MIGS-15

Biotic relationship

Free living

IDA

MIGS-14

Pathogenicity

Unknown

 
 

Biosafety level

2

 
 

Isolation

Human feces

 

MIGS-4

Geographic location

Senegal

IDA

MIGS-5

Sample collection time

September 2010

IDA

MIGS-4.1

Latitude

13.7167

IDA

MIGS-4.1

Longitude

−16.4167

IDA

MIGS-4.3

Depth

Surface

IDA

MIGS-4.4

Altitude

51 m above sea level

IDA

Evidence codes - IDA: Inferred from Direct Assay; TAS: Traceable Author Statement (i.e., a direct report exists in the literature); NAS: Non-traceable Author Statement (i.e., not directly observed for the living, isolated sample, but based on a generally accepted property for the species, or anecdotal evidence). These evidence codes are from the Gene Ontology project [49]. If the evidence is IDA, then the property was directly observed for a live isolate by one of the authors or an expert mentioned in the acknowledgements.

The 16S rRNA sequence (GenBank accession number JF824807) of D. fastidiosa strain JC13T was compared to sequences in GenBank using BLAST [50] and showed a highest similarity of 89.71% with Clostridium innocuum (Figure 1). By comparison with type species from genera within the family Erysipelotrichaceae, D. fastidiosa exhibited a 16S rRNA sequence similarity ranging from 69.90 to 89.71%. Since these values are lower than the 95% threshold recommended by Stackebrandt and Ebers to delineate new genera without performing DDH [3], we propose to classify strain JC13T within a novel genus.
Figure 1.

Phylogenetic tree highlighting the position of D. fastidiosa strain JC113T relative to other type strains within the Erysipelotrichaceae family. GenBank accession numbers are indicated in parentheses. Sequences were aligned using CLUSTALW, and phylogenetic inferences obtained using the maximum-likelihood method within the MEGA software. Numbers at the nodes are percentages of bootstrap values obtained by repeating the analysis 500 times to generate a majority consensus tree. C. innocuum was used as outgroup. The scale bar represents a 1% nucleotide sequence divergence.

Strain JC13T did not exhibit catalase or oxidase activity. Using API Rapid ID 32A, positive reactions were obtained for α-fucosidase and pyroglutamic acid arylamidase. Negative reactions were observed for indole production, nitrate reduction, urease, arginine dihydrolase, α-galactosidase, β-galactosidase 6 phosphate, α-glucosidase, β-glucosidase, α-arabinosidase, β-glucuronidase, N-acetyl-β-glucosaminidase, mannose and raffinose fermentation, glutamic acid decarboxylase, alkanine phospatase, arginine arylamidase, proline arylamidase, leucyl glycine arylamidase, phenylalanine aylamidase, leucine arylamidase, pyroglutamic acid arylamidase, tyrosine arylamidase, alanine arylamidase, glycine arylamidase, histidine arylamidase, glutamyl glutamic acid arylamidase, and serine arylamidase. Using an API 20NE strip, a positive reaction was observed for esculine hydrolysis. No sugar fermentation was observed using API 50CH (Biomerieux). D. fastidiosa is susceptible to amoxicillin, imipenem, metronidazole and ciprofloxacine, but resistant to trimethoprim/sulfamethoxazole, rifampin, doxycycline, and gentamicin. The differential phenotypic characteristics with other species are summarized in Table 2.
Table 2.

Differential characteristics of Dielma fastidiosa strain JC13T, Erysipelothrix inopinata strain MF-EP02, Holdemania filiormis strain ATCC51649T, Eggerthia catenaformis strain JCM1121T, Kandleria vitulina strain JCM1143T

Properties

D. fastidiosa

E. inopinata

H. filiformis

E. catenaformis

K. vitulina

Cell diameter (µm)

0.60

0.5

na

na

na

Oxygen requirement

anaerobic

facultative anaerobic

anaerobic

anaerobic

anaerobic

Gram stain

+

+

+

+

Motility

+

 

Production of

     

Acid arylamidase

+

+

na

na

na

Catalase

Oxidase

na

na

na

Nitrate reductase

na

na

na

Urease

na

na

na

na

β-galactosidase

na

na

na

na

N-acetyl-glucosamine

+

na

na

na

Acid from

     

L-Arabinose

Ribose

w

Mannose

+

+

Mannitol

Sucrose

+

+

+

D-glucose

na

+

+

+

D-fructose

na

+

+

+

D-maltose

w

+

D-lactose

w

+

+

Hydrolysis of

     

Esculin

+

na

+

+

+

G+C content (mol%)

40.0

37.5

na

34.8

34.4

Habitat

human gut

Vegetable broth

Human gut

Human gut

Bovine rumen

Different growth temperatures (25, 30, 37, 45°C) were tested; growth occurred between 25°C and 45°C and optimal growth was observed at 30°C. Colonies were 0.5 to 1 mm in diameter on blood-enriched Columbia agar and BHI agar. Growth of the strain was tested under anaerobic and microaerophilic conditions using GENbag anaer and GENbag microaer systems, respectively (BioMérieux) and in the presence of air with or without 5% CO2. Growth was achieved only under anaerobic conditions. Gram staining showed a rod-shaped Gram-negative bacterium (Figure 2). The motility test was positive. Cells grown on agar have a mean diameter of 0.60 µm and a mean length of 2.2 µm in electron microscopy (Figure 3).
Figure 2.

Gram staining of D. fastidiosa strain JC13T

Figure 3.

Transmission electron microscopy of D. fastidiosa strain JC13T, using a Morgani 268D (Philips) at an operating voltage of 60kV. The scale bar represents 500 nm.

Matrix-assisted laser-desorption/ionization time-of-flight (MALDI-TOF) MS protein analysis was carried out as previously described using a Microflex spectrometer (Bruker Daltonics, Leipzig, Germany) [7,51]. Briefly, a pipette tip was used to pick one isolated bacterial colony from a cultured agar plate, and spread it as a thin film on a MTP 384 MALDI-TOF target plate (Bruker Daltonics). Twelve distinct deposits were made for strain JC13 from twelve isolated colonies. Each smear was overlaid with 2µL of matrix solution (saturated solution of alpha-cyano-4-hydroxycinnamic acid) in 50% acetonitrile, 2.5% tri-fluoracetic-acid, and allowed to dry for five minutes. Measurements were performed with a Microflex spectrometer (Bruker). Spectra were recorded in the positive linear mode for the mass range of 2,000 to 20,000 Da (parameter settings: ion source 1 (IS1), 20 kV; IS2, 18.5 kV; lens, 7 kV). A spectrum was obtained after 675 shots at a variable laser power. The time of acquisition was between 30 seconds and 1 minute per spot. The twelve JC13 spectra were imported into the MALDI BioTyper software (version 2.0, Bruker) and analyzed by standard pattern matching (with default parameter settings) against the reference spectra from 4,334 bacteria (as updated on August 29, 2012), including spectra from 17 species within the Erysipelotrichaceae, contained in the BioTyper database. The method of identification included the m/z from 3,000 to 15,000 Da. For every spectrum, a maximum of 100 peaks were taken into account and compared with spectra in the database. A score enabled the identification, or not, from the tested species: a score > 2 with a validly published species enabled the identification at the species level, a score > 1.7 but < 2 enabled the identification only at the genus level; and a score < 1.7 did not enable any identification. For strain JC13T, no significant score was obtained, suggesting that our isolate was not a member of any known species or genus in the Biotyper database. We incremented our database with the spectrum from strain JC13T (Figure 4). The gel view allowed us to highlight the spectra differences with other species of Erysipelothrichaceae family members (Figure 5).
Figure 4.

Reference mass spectrum from D. fastidiosa strain JC13T. Spectra from 12 individual colonies were compared and a reference spectrum was generated.

Figure 5.

Gel view comparing D. fastidiosa gen. nov. sp. nov strain JC13T and other species within Erysipelotrichaceae family. The gel view displays the raw spectra of loaded spectrum files arranged in a pseudo-gel like look. The x-axis records the m/z value. The left y-axis displays the running spectrum number originating from subsequent spectra loading. The peak intensity is expressed by a Gray scale scheme code. The color bar and the right y-axis indicate the relation between the color a peak is displayed with and the peak intensity in arbitrary units. Displayed species are indicated on the left.

Genome sequencing information

Genome project history

The organism was selected for sequencing on the basis of its phylogenetic position and 16S rRNA similarity to members of the family Erysipelotrichaceae and is part of a study of the human digestive flora aiming at isolating all bacterial species within human feces [1]. It was the seventh genome from the Erysipelotrichaceae family and the first genome of Dielma fastidiosa gen. nov., sp. nov. The Genbank accession number is CAEN00000000 and consists of 82 contigs. Table 3 shows the project information and its association with MIGS version 2.0 compliance [52]
Table 3.

Project information

MIGS ID

Property

Term

MIGS-31

Finishing quality

High-quality draft

MIGS-28

Libraries used

454 GS paired-end 3-kb libraries

MIGS-29

Sequencing platform

454 GS FLX Titanium

MIGS-31.2

Sequencing coverage

28.92×

MIGS-30

Assemblers

gsAssembler

MIGS-32

Gene calling method

PRODIGAL

 

Genbank Date of Release

December 19, 2012

 

NCBI project ID

CAEN00000000

MIGS-13

Project relevance

Study of the human gut microbiome

Growth conditions and DNA isolation

Dielma fastidiosa sp. nov., strain JC13T (= CSUR P149 = DSM 26099) was grown on 5% sheep blood-enriched Columbia agar at 30°C in anaerobic atmosphere. Seven petri dishes were spread and the cultivated bacteria were resuspended in 3×100µl of G2 buffer (EZ1 DNA Tissue kit, Qiagen). A first mechanical lysis was performed with glass powder on a Fastprep-24 device (MP Biomedicals, USA) using 2×20 seconds cycles. DNA was then treated with 2.5µg/µL lysozyme for 30 minutes at 37°C and extracted through the BioRobot EZ1 Advanced XL (Qiagen). The DNA was then concentrated and purified with a QIAamp kit (Qiagen). The yield and concentration was measured using a Quant-it Picogreen kit (Invitrogen) on a GeniosTecan fluorometer at 46.6ng/µl.

Genome sequencing and assembly

DNA (5µg) was mechanically fragmented with a Hydroshear device (Digilab, Holliston, MA, USA) with an enrichment size at 3–4kb. The DNA fragmentation was visualized through the Agilent 2100 BioAnalyzer on a DNA labchip 7500 with an optimal size of 3.4kb. The library was constructed according to the 454 GS FLX Titanium paired-end protocol (Roche). Circularization and nebulization were performed. After PCR amplification through 15 cycles followed by double size selection, the single stranded paired-end library profile was visualized on an Agilent 2100 RNA Pico 6000 Labchip with an optimal length of 522 bp. Then the library was quantified on the Quant-it Ribogreen kit (Invitrogen) on a GeniosTecan fluorometer at 133 pg/µL. The library concentration equivalence was calculated as 4.67E+08 molecules/µL. The library was stored at −20°C until further use.

The shotgun library was clonally amplified with 0.5cpb in 4 emPCR reactions and 1cpb in 4 emPCR reactions with the GS Titanium SV emPCR Kit (Lib-L) v2 (Roche). The yields of the emPCRs were 5.10% and 10.73%, respectively, in the range of 5 to 20% recommended by the Roche procedure. Twice, approximately 790,000 beads were loaded on a GS Titanium PicoTiterPlate PTP Kit 70×75 and sequenced with the GS Titanium Sequencing Kit XLR70 (Roche). The runs were performed overnight and analyzed on the cluster through the gsRunBrowser and Newbler assembler (Roche). A total of 428,372 passed filter wells were obtained and generated 101.3Mb of sequences with an average of length of 219 bp. The passed filter sequences were assembled using Newbler (Roche) with 90% identity and 40 bp as overlap. The final assembly identified 22 scaffolds and 82 large contigs (>1,500bp), and generated a genome size of 3.57Mb which corresponds to a coverage of 28.92x genome equivalent.

Genome annotation

Open reading frames (ORFs) were predicted using Prodigal [53] with default parameters. However, the predicted ORFs were excluded if they spanned a sequencing gap region. The predicted bacterial protein sequences were searched against the GenBank [54] and Clusters of Orthologous Groups (COG) databases using BLASTP. The tRNAs and rRNAs were predicted using the tRNAScanSE [55] and RNAmmer [56] tools, respectively. Lipoprotein signal peptides and numbers of transmembrane helices were predicted using SignalP [57] and TMHMM [58], respectively. ORFans were identified if their BLASTP E-value was lower than 1e-03 for alignment length greater than 80 amino acids. If alignment lengths were smaller than 80 amino acids, we use an E-value of 1e-05. Such parameter thresholds have already been used in previous works to define ORFans. Artemis [59] and DNA Plotter [60] were used for data management and visualization of genomic features, respectively. The Mauve alignment tool (version 2.3.1) was used for multiple genomic sequence alignment [61]. To estimate the mean level of nucleotide sequence similarity at the genome level between D. fastidiosa JC13T and another 6 genomes from members of the Erysipelotrichaceae family (Table 4), orthologous proteins were detected using the Proteinortho [62] and we compared genomes two by two and determined the mean percentage of nucleotide sequence identity among orthologous ORFs using BLASTn.
Table 4.

Genomic comparison of D. fastidiosa JC13T with six other members of Erysipelotrichaceae family

Species

Strain

Genome accession number

Genome Size (Mb)

G+C content %

Dielma fastidiosa

JC13T

CAEN00000000

3,575,363

40.00

Erysipelothrix rhusiopathiae

Fujisawa

NC_015601

1,787,941

36.60

Holdemania filiformis

DSM 12042

NZ_ACCF00000000

3,803,745

50.20

Bulleidia extructa

W1219

NZ_ADFR00000000

3,170963

36.20

Catenibacterium mitsuokai

DSM 15897

NZ_ACCK00000000

4,835437

36.80

Solobacterium moorei

F0204

NZ_AECQ00000000

4,403,767

36.80

Turicibacter sanguinis

PC909

NZ_ADMN00000000

2,953,411

34.10

Genome properties

The genome is 3,574,031 bp long (one chromosome of 3,556,241 bp and one plasmid of 17,790 bp) with a GC content of 40.00% (Figure 6 and Table 5). Of the 3,491 predicted chromosomal genes, 3,441 were protein-coding genes and 50 were RNAs. A total of 2,534 genes (72.58%) were assigned a putative function. ORFans accounted for 269 genes (7.81%) and the remaining genes were annotated as hypothetical proteins. The properties and statistics of the genome are summarized in Tables 5 and 6. The distribution of genes into COGs functional categories is presented in Table 6. The 17,790bp-long plasmid contains 17 protein-coding genes. A BLASTN search showed its closest match to be the DO plasmid from Enterococcus faecium (GenBank Accession number: NC017961).
Figure 6.

Graphical circular map of the chromosome. From outside to the center: Genes on the forward strand (colored by COG categories), genes on the reverse strand (colored by COG categories), RNA genes (tRNAs green, rRNAs red), GC content, and GC skew.

Table 5.

Nucleotide content and gene count levels of the chromosome

Attribute

Value

% of totala

Genome size (bp)

3,556,241

 

DNA coding region (bp)

3,170,580

89.15

DNA G+C content (bp)

1,422,496

40.0

Total genes

3,491

100

RNA genes

50

1.43

Protein-coding genes

3,441

98.56

Genes with function prediction

2,534

72.58

Genes assigned to COGs

2,329

66.71

Genes with peptide signals

259

7.41

Genes with transmembrane helices

905

25.62

aThe total is based on either the size of the genome in base pairs or the total number of protein coding genes in the annotated genome

Table 6.

Number of genes associated with the 25 general COG functional categories

Code

Value

%agea

Description

J

149

4.33

Translation

A

1

0.029

RNA processing and modification

K

163

4.73

Transcription

L

176

5.11

Replication, recombination and repair

B

0

0

Chromatin structure and dynamics

D

24

0.69

Cell cycle control, mitosis and meiosis

Y

0

0

Nuclear structure

V

47

1.36

Defense mechanisms

T

52

1.511

Signal transduction mechanisms

M

105

3.05

Cell wall/membrane biogenesis

N

0

0

Cell motility

Z

0

0

Cytoskeleton

W

0

0

Extracellular structures

U

26

0.75

Intracellular trafficking and secretion

O

76

2.20

Posttranslational modification, protein turnover, chaperones

C

139

4.03

Energy production and conversion

G

88

2.55

Carbohydrate transport and metabolism

E

189

5.49

Amino acid transport and metabolism

F

63

1.83

Nucleotide transport and metabolism

H

72

2.09

Coenzyme transport and metabolism

I

123

3.57

Lipid transport and metabolism

P

127

3.69

Inorganic ion transport and metabolism

Q

25

0.72

Secondary metabolites biosynthesis, transport and catabolism

R

250

7.26

General function prediction only

S

182

5.28

Function unknown

-

301

8.74

Not in COGs

a The total is based on the total number of protein coding genes in the annotated genome

Genome comparison of D. fastidiosa with other genomes of Erysipelotrichaceae family

Here, we compared the genome of D. fastidiosa JC13T with 6 other genomes from Erysipelotrichaceae family (Table 3 and 6). D. fastidiosa (3.57 Mb) is larger than those of E. rhusiopathiae, B. extructa and T. sanguinis (1.78, 3.17 and 2.95 Mb respectively) but smaller than those of H. filiformis, C. mitsuokai and S. moorei (3.80, 4.83 and 4.40 Mb respectively). The G+C content of D. fastidiosa is higher (40.0%) than all the genomes compared except H. filiformis (50.2%). D. fastidiosa has more predicted genes than S. moorei and T. sanguinis (2,619, 2,342 and 2,335 respectively) but less than those of E. rhusiopathiae, H. filiformis, B. extructa and C. mitsuokai (2,709, 3,161, 3,132 and 3,231, respectively). In addition, D. fastidiosa shared 681, 1,005, 650, 804, 824 and 781 orthologous genes with E. rhusiopathiae, H. filiformis, B. extructa, C. mitsuokai, S. moorei and T. sanguinis respectively. The average nucleotide sequence identity ranged from 61.12 to 69.65% among Erysipelotrichaceae family species, and from 64.29 to 65.99% between D. fastidiosa and other species, thus confirming its new species status (Table 7).
Table 7.

The numbers of orthologous protein shared between genomes (above diagonal), average percentage similarity of nucleotides corresponding to orthologous protein shared between genomes (below diagonal) and the numbers of proteins per genome (bold).

Species

D. fastidiosa

E. rhusiopathiae

H. filiformis

B. extructa

C. mitsuokai

S. moorei

T. sanguinis

Dielma fastidiosa

2,619

681

1,005

650

804

824

781

Erysipelothrix rhusiopathiae

64.99

2,709

650

534

553

597

563

Holdemania filiformis

65.99

62.24

3,161

661

761

808

749

Bulleidia extructa

64.89

65.24

62.84

3,132

539

745

524

Catenibacterium mitsuokai

65.13

65.13

61.12

65.13

3,231

649

659

Solobacterium moorei

65.16

65.54

63.13

69.65

66.18

2,342

614

Turicibacter sanguinis

64.29

65.37

64.62

64.76

65.89

64.62

2,335

Conclusion

On the basis of phenotypic, phylogenetic and genome analysis, we formally propose the creation of Dielma fastidiosa gen nov., sp. nov., that contains strain JC13T. This strain has been found in Senegal.

Description of Dielma gen. nov.

Dielma (di.el’ma, N.L. fem. N. Dielma, of Dielmo, the Senegalese village where lived the patient from whom strain JC13T was cultivated).

Gram-negative rods. Strictly anaerobic. Mesophilic. Motile. Negative for catalase, oxidase, nitrate reduction and indole production. Positive for α-fucosidase, pyroglutamic acid arylamidase and esculine hydrolysis. Habitat: human digestive tract. Type species: Dielma fastidiosa.

Description of Dielma fastidiosa sp. nov., gen nov.

Dielma fastidiosa (fas.ti.di.o’sa. N. L. F. adj. from the Latin adjective fastidiosus excessively sensitive; referring to the difficulty to isolate this microorganism). It has been isolated from feces from an asymptomatic Senegalese patient.

Dielma fastidiosa is an anaerobic Gram-negative bacterium. Growth is achieved only anaerobically. Growth occurs on axenic medium between 25 and 45°C, with optimal growth observed at 30°C. Cells stain Gram-negative, are rod-shaped, non-sporulating, motile and have a mean diameter of 0.60 µm and a mean length of 2.2 µm. Colonies are 0.5 to 1 mm in diameter on blood-enriched Columbia agar. Oxidase negative. Catalase negative. Using the API Rapid ID 32A system, positive reactions are obtained for α-fucosidase and pyroglutamic acid arylamidase. Negative reactions for indole production, nitrate reduction, urease, arginine dihydrolase, α-galactosidase, β-galactosidase 6 phosphate, α-glucosidase, β-glucosidase, α-arabinosidase, β-glucuronidase, N-acetyl-β-glucosaminidase, mannose and raffinose fermentation, glutamic acid decarboxylase, alkanine phospatase, arginine arylamidase, proline arylamidase, leucyl glycine arylamidase, phenylalanine aylamidase, leucine arylamidase, pyroglutamic acid arylamidase, tyrosine arylamidase, alanine arylamidase, glycine arylamidase, histidine arylamidase, glutamyl glutamic acid arylamidase, and serine arylamidase. With the API 20NE system, a positive reaction is observed for aesculin. Asaccharolytic. D. fastidiosa is susceptible to amoxicillin, imipenem, metronidazole and ciprofloxacin, but resistant to trimethoprim/sulfamethoxazole, rifampin, doxycycline and gentamicin.

The G+C content of the genome is 40%. The 16S rRNA and genome sequences are deposited in Genbank and EMBL under accession numbers JF824807 and CAEN00000000, respectively. The type strain is JC13T (= CSUR P149 = DSM 26099) was isolated from the fecal flora of a healthy Senegalese patient.

Declarations

Acknowledgements

The authors thank the Xegen Company (www.xegen.fr) for automating the genomic annotation process. This study was funded by the Mediterranee-Infection Foundation.

Authors’ Affiliations

(1)
URMITE, Faculté de médecine, Aix-Marseille Université

References

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