RESUMEN La personalidad polifacética del género Klebsiella se pone de manifiesto debido a que las especies Klebsiella variico/a, Klebsiella pneumoniae y Klebsiella oxytoca pertenecientes a este género, han sido clasificadas de manera tradicional como rizobacterias promotoras del crecimiento vegetal, como patógenos o como patobiontes. De hecho, existen numerosas características genéticas, morfológicas y fisiológicas que se emplean para identificar y clasificar a estas especies con base a sus actividades benéficas o perjudiciales desde el punto de vista humano. Sin embargo, dependiendo del fondo genético y de las condiciones ambientales K. varílcola, K. pneumoniae y K. oxytoca pueden remodelar sus actividades y comportarse de manera diferente a lo clásicamente descrito. Por lo tanto, el presente trabajo pretende revisar los atributos de clasificación de éstas tres especies del género Klebsiella, y al mismo tiempo aportar ejemplos que demuestran que estas mismas especies pueden remodelar sus actividades clásicas conocidas para adaptarse a diferentes condiciones. La presentación de estas evidencias invita a la reflexión sobre aspectos generales sobre la clasificación y sobre la plasticidad del intercambio de información entre el genoma y el ambiente para ajustar el metabolismo de las bacterias. ABSTRACT The multifaceted personality of genus Klebsiella is evident because the species Klebsiella varílcola, Klebsiella pneumoniae and Klebsiella oxytoca belonging to this genus, have been traditionally dassified as plant growth promoting rhizobacteria, as pathogens or as pathobionts. In fact, there are numerous genetic, morphological and physiological characteristics that are used to identify and classify these spedes based on their activities benefidal or damaging from the human point view. However, depending on genetic background and environmental conditions K. varílcola, K. pneumoniae and K. oxytoca can remodel their activities and behave differently than classically described. Therefore, the objective of this work is to review the classification attributes of these three species of genus Klebsiella, and same time provide examples that demónstrate that these same species can remodel their known classical activities to adapt to different conditions. The presentation of these evidences invites reflection on general aspects about classification and plasticity of exchange of information between the genome and environment to adjust the metabolism of bacteria., {"references":["Rossello-Mora R, Amann R. The species concept for prokaryotes. FEMS Microbiol Rev. 2001; 25: 39-67.","Rosselló-Mora R. Updating prokaryotic taxonomy. J Bacteriol . 2005; 187(18):6255-7.","Krieg NR, Holt JG. Bergey's manual of systematic bacteriology. 9th. Ed. Vol. 1. Baltimore: The Williams & Wilkins Co.; 1984.","Vandamme P, Pot B, Gillis M, de Vos P, Kersters K, Swings J. Polyphasic taxonomy, a consensus approach to bacterial systematics. Microbiol Rev. 1996; 60(2):407-438.","Brenner D, Staley J, Krieg N. Classification of procaryotic organisms and the concept of bacterial speciation. In: D. R. Boone, R. W. Castenholz and GMG, editor. Bergey's manual of systematic bacteriology. 2th. ed. New York, N.Y.: Springer Verlag; 2000. p. 27-38.","Casadevall A, Pirofski LA. Host-pathogen interactions: basic concepts of microbial commensalism, colonization, infection, and disease. Infect Immun. 2000; 68(12):6511-8.","Prakash O, Verma M, Sharma P, Kumar M, Kumari K, Singh A, et al. Polyphasic approach of bacterial classification - An overview of recent advances. Indian J Microbiol. 2007;47(2):98- 108.","Paczosa MK, Mecsas J. Klebsiella pneumoniae-. Going on the offense with a strong defense. Microbiol Mol Biol Rev. 2016; 80(3):629-661.","Martínez J, Martínez L, Rosenblueth M, Silva J, Martínez-Romero E. How are gene sequence analyses modifying bacterial taxonomy?: The case of Klebsiella. Int Microbiol. 2004; 7:261-8.","Edwards PR, Ewing WH. Identification of Enterobacteriaceae. 4th ed. Minneapolis, Minn.: urgess Publishing Co.; 1986.","Holt JG, Krieg NR, Sneath PHA, Staley JT, Williams ST. Bergey's Manual of Determinative Bacteriology. 9th ed. New York, N.Y.: Lippincott Williams and Wilkins; 2000.","Orskov I, Fife-Asbury MA. New Klebsiella Capsular Antigen, K82, and the deletion of five of those previously assigned. Int J Syst Evol Microbiol. 1977; 27(4):386-7.","Follador R, Heinz E, Wyres KL, Ellington MJ, Kowarik M, Holt KE, et al. The diversity of Klebsiella pneumoniae surface polysaccharides. Microb genomics. 2016; 2(8): e000073- 1. e000073.","Cowan ST, Steel KJ, Shaw C, Duguid JP. A Classification of the Klebsiella Group. Microbiology. 1960; 23(3):601-12.","Bascomb S, Lapage SP, Willcox WR, Curtís MA. Numerical Classification of theTribe Klebsielleae. Microbiology. 1971; 66(3):279-95.","Orskov I, Orskov F. 4 Serotyping of Klebsiella. In: Bergan TBT-M in M, editor. Academic Press; 1984. p. 143-64.","Wayne LG, Brenner DJ, Colwell R, Grimont P, Krichevsky M, Moore LH, et al. Report of the Ad Hoc Committee on Reconciliation of Approaches to Bacterial Systematics. Vol. 37, International Journal of Systematic Bacteriology. 1987.","Dauga C. Evolution of the gyrB gene and the molecular phylogeny of Enterobacteriaceae: a model molecule for molecular systematic studies. Int J Syst Evol Microbiol. 2002; 52(2): 531-47.","Drancourt M, Bollet C, Carta A, Rousselier P. Phylogenetic analyses of Klebsiella species delinéate Klebsiella and Raoultella gen. nov., with description of Raoultella ornithinolytica comb. nov., Raoultella terrígena comb. nov. and Raoultella planticola comb. nov. Int J Syst Evol Microbiol. 2001; 51(3):925-32.","Podschun R, Ullmann U. Klebsiella spp. as nosocomial pathogens: epidemiology, taxonomy, typing methods and pathogenicity factors. Clinical microbiology reviews. 1998. 11(4):589- 603.","Rosenblueth M, Martínez L, Silva J, Martínez- 1. Romero E. Klebsiella varíicola, a novel species with clinical and plant-associated ¡solates. Vol. 27, System Appl Microbiol. 2004; 27: 27-35.","Wei C-Y, Lin L, Luo L-J, Xing Y-X, Hu C-J, Yang L-T, et al. Endophytic nitrogen-fixing Klebsiella varíicola strain DX120E promotes sugarcane growth. Biol Fértil Soils. 2014; 50(4):657-66.","Lin L, Wei C, Chen M, Wang H, L¡ Y, Li Y, et al. Complete genome sequence of endophytic nitrogen-fixing Klebsiella varíicola strain DX120E. Stand Genomic Sci. 2015; 10(22):2-7.","Martínez-Romero E, Rodríguez-Medina N, Beltrán-Rojel M, Toribio-Jiménez J, Garza-Ramos II. Klebsiella varíicola and Klebsiella quasipneumoniae with capacity to adapt to clinical and plant settings. Salud Pública Mex. 2018; 60(l):29-40.","Zhao M, Wen G, Xu S, Li M. Application of Klebsiella varíicola SH-1 strain [Internet]. China; CN104351255A, 2015.","Zhang Z, Shen G, Zu B, Li Q, Gao L, Zhang Y, et al. Klebsiella varíicola with potassium release function, and culture method and application thereof [Internet]. China; CN103031260A, 2013.","Wu X, Gan B, Z. H, Xie L, Peng W, Tan H, et al. Microbial composition for promoting tobáceo growth and use [Internet]. China; CN106434471A.","Pazos-Rojas LA, Rodríguez-Andrade O, Muñoz-Arenas LC, Morales-García Y, Corral Lugo A, Quintero-Hernández V, et al. Desiccation- tolerant rhizobacteria maintain their plant growth promoting capability after experiencing extreme water stress. SF J Appl Microbiol. 2018; 1:1-13.","Broberg CA, Palacios M, Miller VL. Klebsiella-. a long way to go towards understanding this enigmatic jet-setter. FlOOOPrime Rep. 2014; 64(6): 1-12.","Alcántar-Curiel MD, Blackburn D, Saldaña Z, Gayosso-Vázquez C, lovine NM, De la Cruz MA, et al. Multi-functional analysis of Klebsiella pneumoniae fimbrial types in adherence and biofilm formation. Virulence. 2013; 4(2): 129-38.","Khaertynov KS, Anokhin VA, Rizvanov AA, Davidyuk YN, Semyenova DR, Lubin SA, et al. Virulence factors and antibiotic resistance of Klebsiella pneumoniae strains isolated from neonates with sepsis. Front Med. 2018; 5:225.","March C, Cano V, Moranta D, Llobet E, Pérez-Gutiérrez C, Tomás JM, et al. Role of bacterial surface structures on the interaction of Klebsiella pneumoniae with phagocytes. PLoS One [Internet]. 2013; 8(2): e56847.","Alvarez D, Merino S, Tomás JM, Benedí VJ, Albertí S. Capsular polysaccharide is a major complement resistance factor in lipopolysaccharide O side chain-deficient Klebsiella pneumoniae clinical ¡solates. Infect Immun. 2000; 68(2):953-5.","Llobet E, Martínez-Moliner V, Moranta D, Dahlstróm KM, Regueiro V, Tomás A, et al. Deciphering tissue-induced Klebsiella pneumoniae lipid A structure. Proc Nati Acad Sci. 2015; 112(46): 369-78.","Holden VI, Breen P, Houle S, Dozois CM, Bachman MA. Klebsiella pneumoniae siderophores induce inflammation, bacterial dissemination, and HIF-lo stabilization during pneumonía. MBio [Internet]. 2016; 7(5):e01397- 16.","Bengoechea JA, Sa Pessoa J. Klebsiella pneumoniae infection biology: living to counteract host defences. FEMS Microbiol Rev. 2018; 43(2): 123-44.","Evrard B, Balestrino D, Dosgilbert A, Bouya- Gachancard J-LJ, Charbonnel N, Forestier C, et 1. al. Roles of capsule and lipopolysaccharide O antigen in interactions of human monocyte- derived dendritic cells and Klebsiella pneumonías. Infect Immun. 2010; 78(l):210-9.","Cano V, March C, Insua JL, Aguiló N, Llobet E, Moranta D, et al. Klebsiellapneumoniae survives within macrophages by avoiding delivery to lysosomes. Cell Microbiol. 2015; 17(11): 1537-60.","Cano V, Moranta D, Llobet-Brossa E, Bengoechea JA, Garmendia J. Klebsiella pneumoniae triggers a cytotoxic effect on airway epithelial cells. BMC Microbiol [Internet]. 2009; 9:156.","Keynan Y, Rubinstein E. The changing face of Klebsiella pneumoniae infections in the community. Int J Antimicrob Agents. 2007; 30(5): 385-9.","McCabe R, Lambert L, Frazee B. Invasive Klebsiella pneumoniae infections, California, USA. Emerg Infect Dis. 2010; 16(9): 1490-1.","Shon AS, Bajwa RPS, Russo TA. Hypervirulent (hypermucoviscous) Klebsiella pneumoniae. a new and dangerous breed. Virulence. 2013; 4(2): 107-18.","Liu Y-C, Cheng D-L, Lin C-L. Klebsiella pneumoniae liver abscess associated with septic endophthalmitis. JAMA Intern Med. 1986; 146(10): 1913-6.","Siu LK, Yeh K-M, Lin J-C, Fung C-P, Chang F-Y. Klebsiella pneumoniae liver abscess: a new Alianzas y Tendencias - BUAP, Voi. 4, No. 15 invasive syndrome. Lancet Infect Dis. 2012; 12(ll):881-7.","Pomakova DK, Hsiao C-B, Beanan JM, Olson R, MacDonald U, Keynan Y, et al. Clinical and phenotypic differences between classic and hypervirulent Klebsiella pneumoniae. an emerging and under-recognized pathogenic variant. Eur J Clin Microbiol Infect Dis. 2012; 31(6):981-9.","Iredell J, Brown J, Tagg K. Antibiotic resistance in Enterobacteriaceae: mechanisms and clinical implications. BMJ [Internet]. 2016; 352:6420.","Alves MS, Días RC, de Castro AC, Riley LW, Moreira BM. Identification of clinical isolates of indole-positive and indole-negative Klebsiella spp. J Clin Microbiol. 2006; 44(10):3640-6.","Herzog KAT, Schneditz G, Leitner E, Feierl G, Hoffmann KM, Zollner-Schwetz I, et al. Genotypes of Klebsiella oxytoca isolates from patients with nosocomial pneumonía are distinct from those of isolates from patients with antibiotic-associated hemorrhagic colitis. J Clin Microbiol. 2014; 52(5): 1607-16.","Hajishengallis G, Lamont RJ. Dancing with the Stars: How choreographed bacterial interactions díctate nososymbiocity and give rise to keystone pathogens, accessory pathogens, and pathobionts. Trends Microbiol. 2016; 24(6):477-89.","Hógenauer C, Langner C, Beubler E, Lippe IT, Schicho R, Gorkiewicz G, et al. Klebsiella oxytoca as a Causativa Organism of Antibiotic- Associated Hemorrhagic Colitis. N Engl J Med. 2006; 355(23): 2418-26.","Schneditz G, Rentner J, Roier S, Pletz J, Herzog KAT, Bücker R, et al. Enterotoxicity of a nonribosomal peptide causes antibiotic- associated colitis. Proc Nati Acad Sci. 2014; 111(36): 13181-6.","Darby A, Lertpiriyapong K, Sarkar U, Seneviratne U, Park DS, Gamazon ER, et al. Cytotoxic and pathogenic properties of Klebsiella oxytoca isolated from laboratory animáis. PLoS One [Internet]. 2014; 9(7): el00542-el00542.","Unterhauser K, Pbltl L, Schneditz G, Kienesberger S, Glabonjat RA, Kitsera M, et al. Klebsiella oxytoca enterotoxins tilimycin and tilivalline have distinct host DNA-damaging and microtubule-stabilizing activities. Proc Nati Acad Sci. 2019; 116(9):3774-83.","Pótgens SA, Brossel H, Sboarina M, Catry E, Cani PD, Neyrinck AM, et al. Klebsiella oxytoca expands in cáncer cachexia and acts as a gut pathobiont contributing to intestinal dysfunction. Sci Rep [Internet]. 2018; 8(1): 12321.","Roszak DB, Colwell RR. Survival strategies of bacteria in the natural environment. Microbiol Rev. 1987; 51(3):365-79.","Shapiro JA. Thinking about bacterial populations as multicellular organisms. Annu Rev Microbiol. 1998; 52(l):81-104.","Maatallah M, Vading M, Kabir MH, Bakhrouf A, Kalin M, Naudér P, et al. Klebsiella varíicoia'xs a frequent cause of bloodstream infection in the stockholm area, and associated with higher mortality compared to K. pneumoniae. PLoS One [Internet]. 2014; 9(11): el 13539-el 13539.","Berry GJ, Loeffelholz MJ, Williams-Bouyer N. An Investigation into laboratory misidentification of a bloodstream Klebsiella varilcola infection. J Clin Microbiol. 2015; 53(8):2793-94.","Guo Y, Zhai Y, Zhang Z, Li D, Wang Z, L¡ J, et al. Complete genomic analysis of a kingdom- crossing Klebsiella varilcola ¡solate. Front Microbiol [Internet]. 2018; 9:2428.","Mazumdar D, Saha SP, Ghosh S. Klebsiella pneumoniae rs26 as a potent PGPR isolated from chickpea (Cicer arietinum) rhizosphere. Pharma InnovJ. 2018; 7(ll):56-62.","Nakada K. Useful microoganism settling promoter and method for settling useful microorganism [Internet]. Japan; JP2001352973A, 2001.","Nakada K. Plant growth Prometer [Internet]. Japan; JP2001106608, 2001.","Yikai Z, Defeng Z. Microbial fertilizer capable of promoting growth of rice seedling roots and preparation method thereof [Internet]. China; CN103980026A, 2014.","Chelius MK, Kaeppler SM, Triplett EW. Bacterial Inoculants for enhancing plant growth [Internet]. CA2429751A1, 2002.","Triplett EW, Kaeppler SM, Chelius MK. Bacterial inoculants for enhancing plant growth [Internet]. USA; US2002142917A1, 2002.","Triplett EW, Kaeppler SM, Chelius M. Bacterial inoculants for enhancing plant growth [Internet]. US; US2004116291A1, 2004.","Carabarin-Lima A, León Izurieta L, Rocha- Gracia R, Castañeda M, Torees C, Gutiérrez- Cazarez Z, et al. First evidence of polar flagella in Klebsiella pneumoniae isolated from a patient with neonatal sepsis. J Medical Microbiol. 2016; 65:729-37.","Ren J, Han M, Zhang G, Wu W, Chen X, Jin T, et al. Klebsiella oxytoca and application thereof to promotion of growth of codonopsis [Internet]. China; CN108587970A.","Kim KS, Kim YC, Kwon MK, Cheong SJ, Cho BH, Yang KY, et al. Klebsiella Oxytoca C1036 and plant growth promotion, diseases control and environmental stress reduction method using the same [Internet]. China; KR100800566B1, 2008.","Shi X. Preparation method for special 1. organic fertilizer for tomatoes [Internet]. China; CN108409453A, 2018.","Contreras-Ramos SM, Dávila-Vázquez G, Flores-Hernández F, Marino-Marmolejo EN, Bolaños-Rosales RE. Biofertilizer to increase agricultura! yield [Internet]. USA; US2019077720A1, 2019.","Jia X, Liu Y, Li C, Huang L. Optimum growth condition of Klebsiella oxytoca strain for degrading petroleum pollutants and tolerance research method [Internet]. China; CN105779340A, 2016.","Zhu N, Peng Y, Wu P. Klebsiella oxytoca and its application in bioelectricity production. China; CN103215201A, 2013.","Rosselló-Móra R, Whitman WB. Dialogue on the nomenclature and dassification of prokaryotes. Syst Appl Microbiol. 2019; 42(1):5- 14.","Dye DW, Bradbury JF, Goto M, Hayward AC, Lelliott RA, Schroth MN. International standards for naming pathovars of phytopathogenic bacteria and a list of pathovar ñames and pathotype strains. Rev Plant Pathol. 1980; 59(4): 153-68.","Shapiro JA. Bacteria are small but not stupid: cognition, natural genetic engineering and socio-bacteriology. Stud Hist Philos Sci Part C Stud Hist Philos Biol Biomed Sci. 2007; 38(4):807-19.","Lyon P. The cognitive cell: bacterial behavior reconsiderad. Front Microbiol [Internet]. 2015; 6:264."]}