Abstract
Mutational studies aimed at characterizing the function(s) of bacterial genes required for growth or viability are constrained by the inability to generate deletion strains lacking the gene of interest. To circumvent this limitation, it is possible to generate conditional mutants in which a copy of the gene of interest is introduced into the bacteria to compensate for the loss of the native allele. Expression of the non-native copy of the target gene is typically under control of an inducible promoter, which allows for controllable and regulated production of the gene of interest. Conditional mutants are also broadly useful for phenotypic analyses of genes that require a tightly regulated and artificially inducible copy of the target gene. Herein, we describe the methods used to generate and confirm conditional mutant clones in Borrelia burgdorferi utilizing the Borrelia-adapted lac operator/repressor system.
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References
Falkow S (1988) Molecular Koch’s postulates applied to microbial pathogenicity. Rev Infect Dis 10(Suppl 2):S274–S276
Walker JR, Kovarik A, Allen JS, Gustafson RA (1975) Regulation of bacterial cell division: temperature-sensitive mutants of Escherichia coli that are defective in septum formation. J Bacteriol 123(2):693–703
Eidlic L, Neidhardt FC (1965) Protein and nucleic acid synthesis in two mutants of Escherichia coli with temperature-sensitive aminoacyl ribonucleic acid synthetases. J Bacteriol 89:706–711
Pringle JR (1975) Induction, selection, and experimental uses of temperature-sensitive and other conditional mutants of yeast. Methods Cell Biol 12:233–272
Kamionka A, Bertram R, Hillen W (2005) Tetracycline-dependent conditional gene knockout in Bacillus subtilis. Appl Environ Microbiol 71(2):728–733. doi:10.1128/AEM.71.2.728-733.2005
Groshong AM, Gibbons NE, Yang XF, Blevins JS (2012) Rrp2, a prokaryotic enhancer-like binding protein, is essential for viability of Borrelia burgdorferi. J Bacteriol 194(13):3336–3342. doi:10.1128/JB.00253-12
Bandy NJ, Salman-Dilgimen A, Chaconas G (2014) Construction and characterization of a Borrelia burgdorferi strain with conditional expression of the essential telomere resolvase, ResT. J Bacteriol 196(13):2396–2404. doi:10.1128/JB.01435-13
Dubytska L, Godfrey HP, Cabello FC (2006) Borrelia burgdorferi ftsZ plays a role in cell division. J Bacteriol 188(5):1969–1978. doi:10.1128/JB.188.5.1969-1978.2006
Hyde JA, Shaw DK, Smith R 3rd, Trzeciakowski JP, Skare JT (2010) Characterization of a conditional bosR mutant in Borrelia burgdorferi. Infect Immun 78(1):265–274. doi:10.1128/IAI.01018-09
Ouyang Z, Zhou J, Norgard MV (2014) Synthesis of RpoS is dependent on a putative enhancer binding protein Rrp2 in Borrelia burgdorferi. PLoS One 9(5):e96917. doi:10.1371/journal.pone.0096917
Ye M, Zhang JJ, Fang X, Lawlis GB, Troxell B, Zhou Y, Gomelsky M, Lou Y, Yang XF (2014) DhhP, a cyclic di-AMP phosphodiesterase of Borrelia burgdorferi, is essential for cell growth and virulence. Infect Immun 82(5):1840–1849. doi:10.1128/IAI.00030-14
Sze CW, Morado DR, Liu J, Charon NW, Xu H, Li C (2011) Carbon storage regulator A (CsrA(Bb)) is a repressor of Borrelia burgdorferi flagellin protein FlaB. Mol Microbiol 82(4):851–864. doi:10.1111/j.1365-2958.2011.07853.x
Gilbert MA, Morton EA, Bundle SF, Samuels DS (2007) Artificial regulation of ospC expression in Borrelia burgdorferi. Mol Microbiol 63(4):1259–1273. doi:10.1111/j.1365-2958.2007.05593.x
Xu Q, Shi Y, Dadhwal P, Liang FT (2012) RpoS regulates essential virulence factors remaining to be identified in Borrelia burgdorferi. PLoS One 7(12):e53212. doi:10.1371/journal.pone.0053212
Tilly K, Elias AF, Bono JL, Stewart P, Rosa P (2000) DNA exchange and insertional inactivation in spirochetes. J Mol Microbiol Biotechnol 2(4):433–442
Rosa PA, Tilly K, Stewart PE (2005) The burgeoning molecular genetics of the Lyme disease spirochaete. Nat Rev Microbiol 3(2):129–143. doi:10.1038/nrmicro1086
Liu P, Jenkins NA, Copeland NG (2003) A highly efficient recombineering-based method for generating conditional knockout mutations. Genome Res 13(3):476–484. doi:10.1101/gr.749203
Dancz CE, Haraga A, Portnoy DA, Higgins DE (2002) Inducible control of virulence gene expression in Listeria monocytogenes: temporal requirement of listeriolysin O during intracellular infection. J Bacteriol 184(21):5935–5945. doi:10.1128/JB.184.21.5935-5945.2002
Yansura DG, Henner DJ (1984) Use of the Escherichia coli lac repressor and operator to control gene expression in Bacillus subtilis. Proc Natl Acad Sci U S A 81(2):439–443
Blevins JS, Revel AT, Smith AH, Bachlani GN, Norgard MV (2007) Adaptation of a luciferase gene reporter and lac expression system to Borrelia burgdorferi. Appl Environ Microbiol 73(5):1501–1513. doi:10.1128/AEM.02454-06
Fraser CM, Casjens S, Huang WM, Sutton GG, Clayton R, Lathigra R, White O, Ketchum KA, Dodson R, Hickey EK, Gwinn M, Dougherty B, Tomb JF, Fleischmann RD, Richardson D, Peterson J, Kerlavage AR, Quackenbush J, Salzberg S, Hanson M, van Vugt R, Palmer N, Adams MD, Gocayne J, Weidman J, Utterback T, Watthey L, McDonald L, Artiach P, Bowman C, Garland S, Fuji C, Cotton MD, Horst K, Roberts K, Hatch B, Smith HO, Venter JC (1997) Genomic sequence of a Lyme disease spirochaete, Borrelia burgdorferi. Nature 390(6660):580–586. doi:10.1038/37551
Yin Y, Yang Y, Xiang X, Wang Q, Yang ZN, Blevins J, Lou Y, Yang XF (2016) Insight into the dual functions of bacterial enhancer-binding protein Rrp2 of Borrelia burgdorferi. J Bacteriol 198(10):1543–1552. doi:10.1128/JB.01010-15
Barbour AG (1984) Isolation and cultivation of Lyme disease spirochetes. Yale J Biol Med 57(4):521–525
Hyde JA, Weening EH, Skare JT (2011) Genetic transformation of Borrelia burgdorferi. Curr Protoc Microbiol Chapter 12:Unit 12C 14. doi:10.1002/9780471729259.mc12c04s20
Samuels DS (1995) Electrotransformation of the spirochete Borrelia burgdorferi. Methods Mol Biol 47:253–259. doi:10.1385/0-89603-310-4:253
Yang XF, Pal U, Alani SM, Fikrig E, Norgard MV (2004) Essential role for OspA/B in the life cycle of the Lyme disease spirochete. J Exp Med 199(5):641–648. doi:10.1084/jem.20031960
Coller HA, Coller BS (1986) Poisson statistical analysis of repetitive subcloning by the limiting dilution technique as a way of assessing hybridoma monoclonality. Methods Enzymol 121:412–417. doi:10.1016/0076-6879(86)21039-3
Blevins JS, Hagman KE, Norgard MV (2008) Assessment of decorin-binding protein a to the infectivity of Borrelia burgdorferi in the murine models of needle and tick infection. BMC Microbiol 8:82. doi:10.1186/1471-2180-8-82
Eggers CH, Caimano MJ, Clawson ML, Miller WG, Samuels DS, Radolf JD (2002) Identification of loci critical for replication and compatibility of a Borrelia burgdorferi cp32 plasmid and use of a cp32-based shuttle vector for the expression of fluorescent reporters in the Lyme disease spirochaete. Mol Microbiol 43(2):281–295. doi:10.1046/j.1365-2958.2002.02758.x
Ho SN, Hunt HD, Horton RM, Pullen JK, Pease LR (1989) Site-directed mutagenesis by overlap extension using the polymerase chain reaction. Gene 77(1):51–59. doi:10.1016/0378-1119(89)90358-2
Acknowledgments
This work was supported by funding to J.S.B. through the Arkansas Biosciences Institute (major research component of the Arkansas Tobacco Settlement Proceeds Act of 2000), NIH/NIAID R01-AI087678, NIH/NIAID R21-AI 119532, as well as support through the Translational Research Institute (UL1-TR000039; NIH National Center for Research Resources and National Center for Advancing Translational Sciences) and the UAMS Center for Microbial Pathogenesis and Host Inflammatory Responses (P20-GM103625).
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Latham, J.I., Blevins, J.S. (2018). Generation of Conditional Mutants in Borrelia burgdorferi . In: Pal, U., Buyuktanir, O. (eds) Borrelia burgdorferi. Methods in Molecular Biology, vol 1690. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-7383-5_17
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DOI: https://doi.org/10.1007/978-1-4939-7383-5_17
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