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Phenotypic and genotypic properties of Microbacterium yannicii, a recently described multidrug resistant bacterium isolated from a lung transplanted patient with cystic fibrosis in France

BMC Microbiology volume 13, Article number: 97 (2013) Cite this article

Abstract

Background

Cystic fibrosis (CF) lung microbiota consists of diverse species which are pathogens or opportunists or have unknown pathogenicity. Here we report the full characterization of a recently described multidrug resistant bacterium, Microbacterium yannicii, isolated from a CF patient who previously underwent lung transplantation.

Results

Our strain PS01 (CSUR-P191) is an aerobic, rod shaped, non-motile, yellow pigmented, gram positive, oxidase negative and catalase positive bacterial isolate. Full length 16S rRNA gene sequence showed 98.8% similarity with Microbacterium yannicii G72T type strain, which was previously isolated from Arabidopsis thaliana. The genome size is 3.95Mb, with an average G+C content of 69.5%. In silico DNA-DNA hybridization analysis between our Microbacterium yannicii PS01isolate in comparison with Microbacterium testaceum StLB037 and Microbacterium laevaniformans OR221 genomes revealed very weak relationship with only 28% and 25% genome coverage, respectively. Our strain, as compared to the type strain, was resistant to erythromycin because of the presence of a new erm 43 gene encoding a 23S rRNA N-6-methyltransferase in its genome which was not detected in the reference strain. Interestingly, our patient received azithromycin 250 mg daily for bronchiolitis obliterans syndrome for more than one year before the isolation of this bacterium.

Conclusions

Although significance of isolating this bacterium remains uncertain in terms of clinical evolution, this bacterium could be considered as an opportunistic human pathogen as previously reported for other species in this genus, especially in immunocompromised patients.

Background

Cystic fibrosis (CF) is one of the most common inherited autosomal recessive disease in the Caucasian population. It is due to mutations in the product of the gene encoding the CF transmembrane conductance regulator (CFTR), resulting in chloride channel dysfunction conductance regulator gene [1]. Although CF is a multisystemic disease, the clinical picture is generally dominated by pulmonary involvement, the main cause of morbidity and mortality in this disease. Lung disease is characterized by recurrent and alternative cycles of airway infection and inflammation, leading to bronchiectasis and subsequently to respiratory failure where lung transplantation may constitute the ultimate therapeutic option [2]. Infections in CF patients are considered to be polymicrobial [3]. The pathogens which are traditionally involved include Pseudomonas aeruginosa, Staphylococcus aureus, Haemophilus influenzae and Burkholderia cepacia complex [4–7]. Many studies have shown that the community of microbes present in the airway of CF patients is more diverse and complex than previously thought [3, 8–10]. Many new, emerging and/or multidrug resistant bacteria have been recently reported in CF patients using different technologies including new culture media and molecular methods [3, 8, 11, 12]. In this study, we report the isolation and full description of Microbacterium yannicii isolated from the sputum sample from a lung transplanted CF adult patient for which we have recently published the genome sequence [13]. Microbacterium yannicii G72T the reference type strain isolated from surface sterilized roots of Arabidopsis thaliana was used for comparison [14]. The genus Microbacterium was first proposed in 1919 [15]. Microbacterium sp. belongs to the family Microbacteriaceae [16, 17], order Actinomycetales, class Actinobacteria [17] which comprises mainly aerobic Gram positive bacteria with high G+C content and a peptidoglycan defined by a B-type cross linkage [18]. Based on phylogenetic properties and chemotaxonomic features, the genera Microbacterium and Aureobacterium were unified to form the redefined genus Microbacterium in 1998 [19]. From mid 1990s, the presence of Microbacterium was recognized in human clinical specimens [20–22]. However, to the best of our knowledge, bacteria of this genus have never been reported in clinical samples from CF patients. Here, we present a full description of phenotypic and genomic properties of this new bacterium isolated from a CF sputum sample.

Case report

A 23-year-old woman who has been lung transplanted for CF (heterozygote delta F508/1717-1G genotype) was admitted in emergency in November 2010 in our medical department for acute respiratory failure in the context of uncontrolled CF-related diabetes with ketoacidosis coma. She required rapidly mechanical ventilation support, adapted metabolic adjustment, diabetes management, and nutritional supporting care. Her medical history included long term colonization by multi drug resistant Pseudomonas aeruginosa and Burkholderia multivorans. She had undergone bilateral lung transplantation when she was 19 years old, and 2 years later, she developed progressive chronic lung allograft dysfunction (CLAD) with a bronchiolitis obliterans syndrome (BOS) stage 3 since the last 6 months and a respiratory insufficiency requiring oxygen supplement 2 months before the admission. The immunosuppressive regimen on admission consisted of tacrolimus (trough level around 8 to 10 ng/ml), mycophenolate mofetil (500 mg twice daily) and azithromycin 250 mg daily for BOS for more than one year. The worsening of respiratory function was associated with the persistence of Pseudomonas aeruginosa and Burkholderia multivorans colonization along with appearance of Aspergillus fumigatus. During hospitalization in the ICU, probabilistic antibiotherapy consisted of an association of ceftazidime, tobramycin and inhaled colistin. After an initial improvement, despite she still required oxygenotherapy device and intermittent noninvasive ventilation support, her respiratory function worsened on January 2011. A sputum sample was collected on January 7th, in which multiresistant Pseudomonas aeruginosa and Burkholderia multivorans were isolated on chocolate Poly ViteX agar (bioMérieux, Marcy l’Etoile, France) and cepacia agar (AES laboratory, Combourg, France), respectively. An atypical gram positive strain was isolated at 105 CFU/ml on Columbia CNA agar plate. A treatment with ceftazidime, temocillin and inhaled colistin was started again. Her respiratory function continued to deteriorate and she died after 2 months in a septic clinical condition.

Results

Phenotypic features

The gram positive strain was isolated on Columbia colistin-nalidixic acid CNA agar with 5% sheep blood (bioMérieux), after 24 hours of incubation at 37°C with 5% CO2 (Figure 1A,1B,1C). It also grew on COS medium at 29°C after 24 hours. The colonies are 0.1-0.2 mm in diameter. The isolate was an aerobic, yellow pigmented (Figure 1A), rod-shaped, non-motile, oxidase negative and catalase positive bacterium. This strain was able to grow in microaerophillic atmosphere but not in anaerobic atmosphere. It also grew very weakly at a salt concentration of up to 10% after 48 hours of incubation. As the spectrum for Microbacterium yannicii was not available in the Bruker database at the time of our strain isolation, we were not able to identify correctly and after the addition of Microbacterium yannicii G72 type strain spectrum in our local database, our strain was identified as Microbacterium yannicii with a low score (Score 1.3). Hence, we proceeded with 16SrRNA sequencing for precise identification. Table 1 outlines the results of the commercial phenotypic tests done which includes apiCoryne, apiCH-50 and apiZYM (BioMerieux, Marcy l’Etiole, France) tests to distinguish the CF clinical isolate from five type strains of the genus Microbacterium including Microbacterium yannicii G72T DSM 23203, Microbacterium trichothecenolyticum DSM 8608, Microbacterium flavescens DSM 20643 and Microbacterium hominis DSM 12509. In apiZYM, the enzymatic reaction for β-glucuronidase was positive for CF Microbacterium yannicii PS01 as well as Microbacterium yannicii G72T (DSM 23203). Although some of the biochemical tests for our strain yielded results similar to those reported for M. yannicii G72 type strain [14], however, we found at least nine differences between our isolate and the type strain that are presented in Table 1 along with comparison to the three other type strains. Antibiotic susceptibility was determined on Columbia agar with 5% sheep blood (COS) (bioMérieux) as per CA-SFM guidelines for Coryneform species. Table 2 shows the antibiotic susceptibility pattern of these five strains. The CF clinical strain was resistant to fosfomycin, erythromycin, clindamycin, gentamicin, tobramycin, ciprofloxacin and ofloxacine. The CF clinical isolate was also resistant to trimethoprim-sulfamethoxazole whereas M. yannicii G72 type strain was not (Table 2).

Figure 1
figure 1

Colonial morphology, gram staining and transmission electron microscopic image of the CF clinical isolate Microbacterium yannicii PS01. A. CF clinical isolate Microbacterium yannicii PS01 was grown on Columbia colistin-nalidixic acid agar with 5% sheep blood (bioMérieux) at 37°C with 5% CO2. The colony appeared as yellow, round and smooth. B. Gram staining picture of the gram-positive coccobacilli CF clinical isolate “CF Microbacterium yannicii PS01” viewed at 100X magnification. C. Transmission electron microscopy image of M. yannicii strain PS01, using a Morgani 268D (Philips) at an operating voltage of 60kV. The scale bar represents 900 nm.

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Table 1 Comparison of phenotypic characteristics of M. yannicii PS01 with closely related species
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Table 2 Antibiotic susceptibility testing of M. yannicii PS01 with closely related species
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Genotypic features

The 16S rRNA sequence of our isolate Strain PS01 showed 98.8% similarity with Microbacterium yannicii G72T strain (DSM23203) (GenBank accession number FN547412), 98.7% with Microbacterium trichothecenolyticum, and 98.3% similarity with both Microbacterium flavescens and Microbacterium hominis. Based on 16S rRNA full length gene sequence (1510 bp), our isolate was identified as Microbacterium yannicii. Partial rpoB sequences (980 bp) as well as partial gyrB sequences were also determined for the four strains and a concatenated phylogenetic tree was constructed to show the phylogenetic position of CF Microbacterium yannicii PS01 (Figure 2).

Figure 2
figure 2

Concatenated phylogenetic tree of Microbacterium species using NJ method. Concatenated phylogenetic tree based on 16SrRNA-rpoB-gyrB sequence highlighting the phylogenetic position of CF Microbacterium yannicii PS01. Corynebacterium diphtheriae was used as an out group. Sequences were aligned using CLUSTALX and Phylogenetic inferences obtained using Neighbor joining method within Mega 5 software. Bootstrap values are expressed by percentage of 1000 replicates with Kimura 2 parameter test and shown at the branching points. The branches of the tree are indicated by the genus and species name of the type strains followed by the NCBI Gene accession numbers: a: 16SrRNA; b: rpoB; c: gyrB. (# rpoB and § gyrB sequence of M. trichothecenolyticum was obtained for this study).

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Genome analysis and comparison

The genome of CF Microbacterium yannicii (Strain PS01, CSUR Reference No.P191) was sequenced and the draft genome sequence has been deposited in EMBL under the accession number CAJF01000001-CAJF01000067 [13]. The genome exhibits a total size of 3,952,501 bp and a G+C content of 69.5% (Table 3). We performed in silico DNA - DNA hybridization of the whole genome of CF Microbacterium yannicii against the two available genomes in this genus i.e. Microbacterium testaceum StLB037 and Microbacterium laevaniformans OR221 and the overall results are presented in Table 3. At E-value 1.00e-5, the species coverage in Microbacterium testaceum StLB037 and Microbacterium laevaniformans OR221 was only 28% and 25.05%, respectively (Table 3). The numbers of proteins with no similarity in comparison to CF Microbacterium yannicii were 882 and 988 and with similarity up to 80% were 598 and 580 of Microbacterium testaceum StLB037 and Microbacterium laevaniformans OR221, respectively (Table 3). We analyzed the resistome of CF M. yannicii PS01 and found that there were 11 ORFs corresponding to Beta-lactamase family proteins, 5 ORFs corresponding to Aminoglycoside phosphotransferase family proteins that could explains the resistance of this isolate to aminoglycosides, 1 ORF corresponding to a macrolide efflux protein family and a new erm gene encoding a 23S rRNA N-6-methyltransferase that could explain the resistance to erythromycin (Table 2 and Table 4). Microbacterium yannicii G72T reference strain was susceptible to erythromycin and after designing primers targeting the new erm gene we found that this reference strain do not contain this gene as PCR was only positive for our CF isolate (data not shown). We also found mutations in gyrA (Ser83Ala) and parC (Ser80Ala) that were likely the cause of resistance against fluoroquinolone compounds (Table 2 and Table 4). Resistance to trimethoprim-sulfamethoxazole was likely due to the presence of a DHPS encoding gene (Table 4). We also found 17 ORFs for multidrug efflux transporters such as ion channels, multidrug ABC transporters, amino acid transporters, and major facilitator superfamily proteins which could explain the resistance to other antibiotics (Table 4).

Table 3 General features of M.yannicii PS01 genome in comparison with M. testaceum StLB037 and M. laevaniformans OR221 genomes
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Table 4 Antibiotic resistance genes in M.yannicii PS01 genome
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Discussion

Genus Microbacterium belongs to the Microbacteriaceae family, which contains species highly related by 16S rRNA gene sequence that are difficult to identify at the species level [19]. In this genus, the only available genomes before our previous work [23] were those of Microbacterium testaceum StLB037 and [23] and Microbacterium laevaniformans OR221 [24]. We used a polyphasic taxonomic approach for the precise identification of our new species. Firstly, MALDI-TOF-MS was used for the identification of the bacterium. MALDI-TOF-MS, a rapid and reliable method to identify bacterial isolates at the species and subspecies level [25, 26] was used for the identification of this bacterium. Although initially, our strain was only identified at the genus level, it was correctly identified as Microbacterium yannicii at the species level when spectrum from the reference strain was added to the database (Figure 3). We performed apiZYM, apiCH50, apiCoryne and antibiotic susceptibility phenotypic tests to compare our strain to Microbacterium yannicii G72 type strain as well as to other closely related species (Microbacterium trichothecenolyticum, Microbacterium flavescens and Microbacterium hominis). In these tests, we have found only few differences between our strain and the type strain. For example we found that the reference strain was susceptible to erythromycin whereas our strain was not, and this was likely due to the presence of a 23S rRNA methyltransferase in the genome of our strain that was absent in the reference strain. These differences may be explained by the different lifestyle of the two strains, one living in roots and the other in human respiratory tract leading to different genomic repertoires that can produce alternative or atypical phenotypes that are better adapted to their environment as recently exemplified in Enterobacter aerogenes[27]. Finally, whole genome sequence analysis of our strain allows us to fully characterize this new species including the genetic determinants associated with its specific antibiotic resistance phenotype likely acquired from different sources. In silico DNA-DNA hybridization of the genome of CF Microbacterium yannicii against the two other available genomes (Microbacterium testaceum StLB037 and Microbacterium laevaniformans OR221) was very low (≤ 70%). This was similar to DNA-DNA hybridization experiments reported in the seminal paper on the description of Microbacterium yannicii G72T species by Karojet et al. who showed a genetic relatedness of only 15.9%, 31.2%, and 45.1% between reference strain Microbacterium yannicii G72 and Microbacterium hominis, Microbacterium insulae, and Microbacterium trichothecenolyticum, respectively [14]. As all the organ transplant recipients, our patient was immunocompromised, with an over immunosuppressive regimen containing a long macrolide therapy in the context of chronic lung allograft dysfunction, such conditions with might play a crucial role in the development of Microbacterium spp. infection or colonization. Indeed Microbacterium spp. have been described as a causative agent of infections in immunocompromised patients such as, cancer patients [28, 29], endophthalmitis patients [21], interstitial pulmonary infection after heart transplantation [30], bone marrow transplant recipients [31], and bacteremia [32–34]. To the best of our knowledge, such infection with Microbacterium spp has not been previously described in the double context of lung transplantation and in cystic fibrosis. Microbacterium spp. have been isolated from clinical specimens including blood culture, superficial wounds, pleural fluid, sinus aspirate, bone infection, endophthalmitis, dialysis fluid, lymph node, catheter tip, knee puncture fluid, wound swab, urine, gall bladder, throat swab, prosthetic hip infection, conjuctival swab, tracheal secretion and urethral swab [35]. The source of this bacterium in our patient was also undetermined but in our opinion, plants or vegetables may be a potential source of transmission in CF patients as well as a possible person to person transmission from another patient. Bacteria of the genus Burkholderia, Pandoraea, or Pseudomonas for example, which are known to be frequently recovered in the respiratory tract of CF patients, are also endophytic bacteria in plants. There results reinforce the hypothesis that plant associated environments may act as niche for putative opportunistic human pathogenic bacteria [36].

Figure 3
figure 3

MSP Dendrogram based on different Microbacterium species hierarchy along with other species of the genus Microbacterium (reference spectra obtained from Bruker database) upon the addition of Microbacterium yannicii G72 type strain and CF Microbacterium yannicii PS01. (* Spectra generated).

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Conclusions

Our results showed that CF Microbacterium yannicii, which has previously been isolated from Arabidopsis thaliana roots, has never been reported from a human clinical specimen and its pathogenicity in this context is unknown. Studies have shown that bacteria from this genus have been associated previously with infections, predominantly in immunocompromised patients; however, the isolation of Microbacterium yannicii is unclear if it could have been the result of a specific exacerbation observed in this patient. In our study, the patient received immunosuppressive therapy since her lung transplantation. Because the patient was also chronically colonized by other well-known pathogens, it is difficult to establish the true significance of isolating this bacterium in terms of clinical evolution. Hence, it is hypothesized that this bacterium could be considered as an opportunistic human pathogen in immunocompromised patients but this should be further investigated in the future.

Methods

Bacterial isolate and identification

Microbacterium yannicii G72T reference strain (DSM23203) [14] was used as a control for the comparison of phenotypic and genotypic properties of our strain. Our CF strain was isolated on Columbia CNA agar plate (bioMérieux), and was identified by Matrix assisted Laser desorption and ionization time-of-flight mass spectrometry (MALDI TOF-MS) using a Microflex machine (Bruker Daltonics). The biochemical tests were performed on the commercially available apiCoryne, apiCH-50 and apiZYM test strips (BioMerieux, Marcy l’Etiole, France) according to manufacturer’s i0n1str0uctions.

Antibiotic susceptibility test

Antibiotic susceptibility was determined on Columbia agar with 5% sheep blood (COS) (bioMérieux) by disk diffusion method as per CA-SFM guidelines for coryneform species and the susceptibility results were interpreted according to the recommendations of the “Comité de l’Antibiogramme de la Société Française de Microbiologie (CA-SFM)” (http://www.sfm-microbiologie.org/).

PCR and sequencing

To investigate the phylogenetic position of this strain, 16S rRNA, rpoB and gyrB genes were amplified and sequenced with Big Dye Terminator reagents (Applied Biosystems) ABI 3730 Automated Sequencer and the sequences were blasted against the GenBank database. The sequence of the primers used in this study are 16SrRNA F-5′-AGAGTTTGATCCTGGCTCAG-3′, 16SrRNA R-5′-ACGGCTACCTTGTTACGACTT-3′, MY rpoB F-5′-AAGGGMACSTTCGTCATCAA-3′, MY rpoB R-5′-CGATCAGACCGATGTTCGGG-3′, MYgyrB F-5′-GASSGCSTTCCTSAACAAGG-3′and MYgyrB R-5′-GCNCGGAASCCCTCYTCGTG-3′. Sequence alignment was performed using CLUSTAL X, and concatenated phylogenetic tree was constructed using MEGA 5 software (Molecular Evolutionary Genetic Analysis, vers.5, 2011) using neighbor joining tree method and 1000 bootstrap replications [37].

Genome

The genome of this strain was sequenced using Genome Sequencer Titanium (454 Life Sciences, Branford, CT) and reported recently [13]. All contigs from genome assembly process were submitted to online bioserver “RAST server: Rapid Annotation using Subsystems Technology (http://www.theseed.org)” [38] to predict protein-encoding genes, rRNA and tRNA sequences, and assigned functions to these genes. Predicted proteins were compared against Non Redundant (nr) GenBank database using BLASTP (e-value 10E-8; identity ≥30%; coverage ≥50%) and COG databases of the National Center for Biotechnology Information (NCBI) (http://www.ncbi.nlm.nih.gov). tRNA and rRNA genes were also verified on tRNAscan-SE Search Server (http://lowelab.ucsc.edu/tRNAscan-SE) and RFAM (http://rfam.sanger.ac.uk) respectively. Genome comparison was performed by “in silico” DNA-DNA hybridization using BlastN analysis in a local bioserver to determine the full-length alignment between two genome sequences and the coverage percentage using the cut-off stringency of E-value at 1.00e-5 [30].

References

  1. Riordan JR, Rommens JM, Kerem B, Alon N, Rozmahel R, Grzelczak Z, Zielenski J, Lok S, Plavsic N, Chou JL: Identification of the cystic fibrosis gene: cloning and characterization of complementary DNA. Science. 1989, 245: 1066-1073. 10.1126/science.2475911.

    Article  PubMed  CAS  Google Scholar 

  2. Zemanick ET, Wagner BD, Sagel SD, Stevens MJ, Accurso FJ, Harris JK: Reliability of quantitative real-time PCR for bacterial detection in cystic fibrosis airway specimens. PLoS One. 2010, 5: e15101-10.1371/journal.pone.0015101.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  3. Bittar F, Rolain JM: Detection and accurate identification of new or emerging bacteria in cystic fibrosis patients. Clin Microbiol Infect. 2010, 16: 809-820. 10.1111/j.1469-0691.2010.03236.x.

    Article  PubMed  CAS  Google Scholar 

  4. Burns JL, Emerson J, Stapp JR, Yim DL, Krzewinski J, Louden L, Ramsey BW, Clausen CR: Microbiology of sputum from patients at cystic fibrosis centers in the United States. Clin Infect Dis. 1998, 27: 158-163. 10.1086/514631.

    Article  PubMed  CAS  Google Scholar 

  5. Gibson RL, Burns JL, Ramsey BW: Pathophysiology and management of pulmonary infections in cystic fibrosis. Am J Respir Crit Care Med. 2003, 168: 918-951. 10.1164/rccm.200304-505SO.

    Article  PubMed  Google Scholar 

  6. Gilligan PH: Microbiology of airway disease in patients with cystic fibrosis. Clin Microbiol Rev. 1991, 4: 35-51.

    PubMed  CAS  PubMed Central  Google Scholar 

  7. Shreve MR, Butler S, Kaplowitz HJ, Rabin HR, Stokes D, Light M, Regelmann WE: Impact of microbiology practice on cumulative prevalence of respiratory tract bacteria in patients with cystic fibrosis. J Clin Microbiol. 1999, 37: 753-757.

    PubMed  CAS  PubMed Central  Google Scholar 

  8. Bittar F, Richet H, Dubus JC, Reynaud-Gaubert M, Stremler N, Sarles J, Raoult D, Rolain JM: Molecular detection of multiple emerging pathogens in sputa from cystic fibrosis patients. PLoS One. 2008, 3: e2908-10.1371/journal.pone.0002908.

    Article  PubMed  PubMed Central  Google Scholar 

  9. Harris JK, De Groote MA, Sagel SD, Zemanick ET, Kapsner R, Penvari C, Kaess H, Deterding RR, Accurso FJ, Pace NR: Molecular identification of bacteria in bronchoalveolar lavage fluid from children with cystic fibrosis. Proc Natl Acad Sci U S A. 2007, 104: 20529-20533. 10.1073/pnas.0709804104.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  10. Coenye T, Goris J, Spilker T, Vandamme P, LiPuma JJ: Characterization of unusual bacteria isolated from respiratory secretions of cystic fibrosis patients and description of Inquilinus limosus gen. nov., sp. nov. J Clin Microbiol. 2002, 40: 2062-2069. 10.1128/JCM.40.6.2062-2069.2002.

    Article  PubMed  PubMed Central  Google Scholar 

  11. Rogers GB, Carroll MP, Serisier DJ, Hockey PM, Jones G, Bruce KD: Characterization of bacterial community diversity in cystic fibrosis lung infections by use of 16s ribosomal DNA terminal restriction fragment length polymorphism profiling. J Clin Microbiol. 2004, 42: 5176-5183. 10.1128/JCM.42.11.5176-5183.2004.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  12. Lambiase A, Raia V, Del PM, Sepe A, Carnovale V, Rossano F: Microbiology of airway disease in a cohort of patients with cystic fibrosis. BMC Infect Dis. 2006, 6: 4-10.1186/1471-2334-6-4.

    Article  PubMed  PubMed Central  Google Scholar 

  13. Sharma P, Diene SM, Gimenez G, Rolain J-M: Genome sequence of Microbacterium yannicii, a bacterium isolated from cystic fibrosis patient. J Bacteriol. 2012, 194 (17): 4785-10.1128/JB.01088-12.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  14. Karojet S, Kunz S, van Dongen JT: Microbacterium yannicii sp. nov., isolated from Arabidopsis thaliana roots. Int J Syst Evol Microbiol. 2012, 62: 822-826. 10.1099/ijs.0.026955-0.

    Article  PubMed  CAS  Google Scholar 

  15. Orla-Jensen S: The Lactic acid bacteria. 1919, Denmark: Host and Son, Copenhagen, 1-118.

    Google Scholar 

  16. Park YH, Suzuki K, Yim DG, Lee KC, Kim E, Yoon J, Kim S, Kho YH, Goodfellow M, Komagata K: Suprageneric classification of peptidoglycan group B actinomycetes by nucleotide sequencing of 5S ribosomal RNA. Antonie Van Leeuwenhoek. 1993, 64: 307-313.

    Article  PubMed  CAS  Google Scholar 

  17. Stackebrandt E, Rainey FA, Ward-Rainey NL: Proposal for a new hierarchic classification system, actino bacteria classis nov. Int J Syst Bacteriol. 1997, 47: 479-491. 10.1099/00207713-47-2-479.

    Article  Google Scholar 

  18. Schleifer KH, Kandler O: Peptidoglycan types of bacterial cell walls and their taxonomic implications. Bacteriol Rev. 1972, 36: 407-477.

    PubMed  CAS  PubMed Central  Google Scholar 

  19. Takeuchi M, Hatano K: Union of the genera Microbacterium Orla-Jensen and Aureobacterium Collins et al. in a redefined genus Microbacterium. Int J Syst Bacteriol. 1998, 48 (Pt 3): 739-747.

    Article  PubMed  CAS  Google Scholar 

  20. Funke G, Falsen E, Barreau C: Primary identification of Microbacterium spp. encountered in clinical specimens as CDC coryneform group A-4 and A-5 bacteria. J Clin Microbiol. 1995, 33: 188-192.

    PubMed  CAS  PubMed Central  Google Scholar 

  21. Funke G, Haase G, Schnitzler N, Schrage N, Reinert RR: Endophthalmitis due to Microbacterium species: case report and review of microbacterium infections. Clin Infect Dis. 1997, 24: 713-716. 10.1093/clind/24.4.713.

    Article  PubMed  CAS  Google Scholar 

  22. Funke G, von GA, Weiss N: Primary identification of Aureobacterium spp. isolated from clinical specimens as “Corynebacterium aquaticum”. J Clin Microbiol. 1994, 32: 2686-2691.

    PubMed  CAS  PubMed Central  Google Scholar 

  23. Morohoshi T, Wang WZ, Someya N, Ikeda T: Genome sequence of Microbacterium testaceum StLB037, an N-acylhomoserine lactone-degrading bacterium isolated from potato leaves. J Bacteriol. 2011, 193: 2072-2073. 10.1128/JB.00180-11.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  24. Brown SD, Palumbo AV, Panikov N, Ariyawansa T, Klingeman DM, Johnson CM, Land ML, Utturkar SM, Epstein SS: Draft genome sequence formicrobacterium laevaniformansstrain OR221: a bacterium tolerant to metals, nitrate, and low pH.J Bacteriol. 2012, 194: 3279-3280. 10.1128/JB.00474-12.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  25. Lundquist M, Caspersen MB, Wikstrom P, Forsman M: Discrimination of Francisella tularensis subspecies using surface enhanced laser desorption ionization mass spectrometry and multivariate data analysis. FEMS Microbiol Lett. 2005, 243: 303-310. 10.1016/j.femsle.2004.12.020.

    Article  PubMed  CAS  Google Scholar 

  26. Seng P, Drancourt M, Gouriet F, La SB, Fournier PE, Rolain JM, Raoult D: Ongoing revolution in bacteriology: routine identification of bacteria by matrix-assisted laser desorption ionization time-of-flight mass spectrometry. Clin Infect Dis. 2009, 49: 543-551. 10.1086/600885.

    Article  PubMed  CAS  Google Scholar 

  27. Diene SM, Merhej V, Henry M, El FA, Roux V, Robert C, Azza S, Gavory F, Barbe V, La SB, Raoult D, Rolain JM: The rhizome of the multidrug-resistant Enterobacter aerogenes genome reveals how new “killer bugs” are created because of a sympatric lifestyle. Mol Biol Evol. 2013, 30: 369-383. 10.1093/molbev/mss236.

    Article  PubMed  CAS  Google Scholar 

  28. Adderson EE, Boudreaux JW, Hayden RT: Infections caused by coryneform bacteria in pediatric oncology patients. Pediatr Infect Dis J. 2008, 27: 136-141.

    PubMed  Google Scholar 

  29. Alonso-Echanove J, Shah SS, Valenti AJ, Dirrigl SN, Carson LA, Arduino MJ, Jarvis WR: Nosocomial outbreak of Microbacterium species bacteremia among cancer patients. J Infect Dis. 2001, 184: 754-760. 10.1086/323080.

    Article  PubMed  CAS  Google Scholar 

  30. Giammanco GM, Pignato S, Grimont PA, Grimont F, Santangelo C, Leonardi G, Giuffrida A, Legname V, Giammanco G: Interstitial pulmonary inflammation due to Microbacterium sp. after heart transplantation. J Med Microbiol. 2006, 55: 335-339. 10.1099/jmm.0.46219-0.

    Article  PubMed  Google Scholar 

  31. Hirji Z, Saragosa R, Dedier H, Crump M, Franke N, Burrows L, Jamieson F, Brown S, Gardam MA: Contamination of bone marrow products with an actinomycete resembling Microbacterium species and reinfusion into autologous stem cell and bone marrow transplant recipients. Clin Infect Dis. 2003, 36: e115-e121. 10.1086/374051.

    Article  PubMed  Google Scholar 

  32. Ko KS, Oh WS, Lee MY, Peck KR, Lee NY, Song JH: A new Microbacterium species isolated from the blood of a patient with fever: Microbacterium pyrexiae sp. nov. Diagn Microbiol Infect Dis. 2007, 57: 393-397. 10.1016/j.diagmicrobio.2006.10.010.

    Article  PubMed  Google Scholar 

  33. Laffineur K, Avesani V, Cornu G, Charlier J, Janssens M, Wauters G, Delmee M: Bacteremia due to a novel Microbacterium species in a patient with leukemia and description of Microbacterium paraoxydans sp. nov. J Clin Microbiol. 2003, 41: 2242-2246. 10.1128/JCM.41.5.2242-2246.2003.

    Article  PubMed  PubMed Central  Google Scholar 

  34. Lau SK, Woo PC, Woo GK, Yuen KY: Catheter-related Microbacterium bacteremia identified by 16S rRNA gene sequencing. J Clin Microbiol. 2002, 40: 2681-2685. 10.1128/JCM.40.7.2681-2685.2002.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  35. Gneiding K, Frodl R, Funke G: Identities of Microbacterium spp. encountered in human clinical specimens. J Clin Microbiol. 2008, 46: 3646-3652. 10.1128/JCM.01202-08.

    Article  PubMed  PubMed Central  Google Scholar 

  36. Mendes R, Pizzirani-Kleiner AA, Araujo WL, Raaijmakers JM: Diversity of cultivated endophytic bacteria from sugarcane: genetic and biochemical characterization of Burkholderia cepacia complex isolates. Appl Environ Microbiol. 2007, 73: 7259-7267. 10.1128/AEM.01222-07.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  37. Tamura K, Peterson D, Peterson N, Stecher G, Nei M, Kumar S: MEGA5: molecular evolutionary genetics analysis using maximum likelihood, evolutionary distance, and maximum parsimony methods. Mol Biol Evol. 2011, 28: 2731-2739. 10.1093/molbev/msr121.

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  38. Aziz RK, Bartels D, Best AA, DeJongh M, Disz T, Edwards RA, Formsma K, Gerdes S, Glass EM, Kubal M, Meyer F, Olsen GJ, Olson R, Osterman AL, Overbeek RA, McNeil LK, Paarmann D, Paczian T, Parrello B, Pusch GD, Reich C, Stevens R, Vassieva O, Vonstein V, Wilke A, Zagnitko O: The RAST Server: rapid annotations using subsystems technology. BMC Genomics. 2008, 9: 75-10.1186/1471-2164-9-75.

    Article  PubMed  PubMed Central  Google Scholar 

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Acknowledgements

We thank Linda Hadjadj for her technical assistance.

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Authors and Affiliations

  1. Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergents (URMITE), CNRS-IRD, UMR 6236, Méditerranée Infection, Faculté de Médecine et de Pharmacie, Aix-Marseille Université, 27 Bd Jean Moulin, Marseille Cedex 05, 13385, France

    Poonam Sharma, Seydina M Diene, Sandrine Thibeaut, Fadi Bittar, Véronique Roux, Martine Reynaud-Gaubert & Jean-Marc Rolain

  2. Centre de Soins de la mucoviscidose et Centre de transplantation Pulmonaire, Centre Hospitalo-Universitaire Nord, chemin des Bourrelly, Marseille, 13015, France

    Carine Gomez & Martine Reynaud-Gaubert

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  1. Poonam Sharma
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Correspondence to Jean-Marc Rolain.

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Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

PS carried out all the experiments and wrote the manuscript. SMD carried out the genomics study. ST and CG contributed the case report. VR helped in analyzing data. FB and MRG critically revised the manuscript. JMR conceived the idea, analyzed the data and helped to draft the manuscript. All authors read and approved the final manuscript.

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Sharma, P., Diene, S.M., Thibeaut, S. et al. Phenotypic and genotypic properties of Microbacterium yannicii, a recently described multidrug resistant bacterium isolated from a lung transplanted patient with cystic fibrosis in France. BMC Microbiol 13, 97 (2013). https://doi.org/10.1186/1471-2180-13-97

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  • DOI: https://doi.org/10.1186/1471-2180-13-97

Keywords

  • Cystic fibrosis
  • Antibiotic resistance
  • Multidrug resistant bacteria
  • Microbacterium yannicii

BMC Microbiology

ISSN: 1471-2180

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