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Markerless Gene Editing in the Hyperthermophilic Archaeon Thermococcus kodakarensis

超嗜热古细菌Thermococcus kodakarensis的无标记基因编辑

AG Alexandra M. Gehring *
TS Travis J. Sanders *
TS Thomas J. Santangelo

 (*contributed equally to this work) 发布: 2017年11月20日第7卷第22期 DOI: 10.21769/BioProtoc.2604 浏览次数: 7940

评审: Modesto Redrejo-RodriguezTimo LehtiAlba Blesa

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Abstract

The advent of single cell genomics and the continued use of metagenomic profiling in diverse environments has exponentially increased the known diversity of life. The recovered and assembled genomes predict physiology, consortium interactions and gene function, but experimental validation of metabolisms and molecular pathways requires more directed approaches. Gene function–and the correlation between phenotype and genotype is most obviously studied with genetics, and it is therefore critical to develop techniques permitting rapid and facile strain construction. Many new and candidate archaeal lineages have recently been discovered, but experimental, genetic access to archaeal genomes is currently limited to a few model organisms. The results obtained from manipulating the genomes of these genetically-accessible organisms have already had profound effects on our understanding of archaeal physiology and information processing systems, and these continued studies also help resolve phylogenetic reconstruction of the tree of life. The hyperthermophilic, planktonic, marine heterotrophic archaeon Thermococcus kodakarensis, has emerged as an ideal genetic system with a suite of techniques available to add or delete encoded activities, or modify expression of genes in vivo. We outline here techniques to rapidly and markerlessly delete a single, or repetitively delete several, continuous sequences from the T. kodakarensis genome. Our procedure includes details on the construction of the plasmid DNA necessary for transformation that directs, via homologous recombination, integration into the genome, identification of strains that have incorporated plasmid sequences (termed intermediate strains), and confirmation of plasmid excision, leading to deletion of the target gene in final strains. Near identical procedures can be employed to modify, rather than delete, a genomic locus.

Keywords: Genome editing (基因组编辑) search Gene deletion (基因删除) search Thermococcus kodakarensis (Thermococcus kodakarensis) search

Background

Archaea often thrive in seemingly inhospitable and rapidly changing environments. Analyses of archaeal genomes reveal a plethora of metabolic strategies, predict sophisticated and highly interdependent regulatory networks underlying gene expression and reveal many genes whose protein–and increasingly often stable RNA–products lack a defined function. The ability to challenge existing, and define new pathways through genetic manipulation has assisted in deconvoluting archaeal physiology and information processing systems, and has more recently opened archaeal species to synthetic- and systems-level approaches to define intra- and intercellular networks.

Thermococcus kodakarensis is a hyperthermophilic, anaerobic, marine archaeon for which a genetic system has been developed over the last decade (Sato et al., 2003 and 2005; Fukui et al., 2005; Santangelo et al., 2008; Santangelo and Reeve, 2011; Hileman and Santangelo, 2012). The ability to genetically modify T. kodakarensis has allowed for the study of individual gene function in metabolism, replication, transcription and translation. Using a recombination based system and both selective and counter-selective markers, individual genes are deleted from the T. kodakarensis genome in a markerless manner (Figure 1). This markerless deletion strategy allows the consecutive deletion of multiple genes in a single strain using the same strategy for each gene.

T. kodakarensis strain TS559 (ΔTK2276; ΔTK0254::TK2276; ΔTK0149; ΔTK0664) requires the presence of agmatine and tryptophan for cellular growth (Santangelo et al., 2010). The deletion strategy presented here utilizes the selectable and counter-selectable markers TK0149 and TK0664, respectively. TK0149 encodes a pyruvoyl-dependent arginine decarboxylase, an enzyme necessary in the conversion of arginine to agmatine which is then converted to putrescine. Cells lacking TK0149 are dependent on the addition of agmatine to the media for viability. TK0664 encodes a hypoxanthine guanine phosphoribosyltransferase, an enzyme involved in a ribonucleotide scavenging pathway. Cells encoding TK0664 can metabolize 6-methylpurine (6-MP), a cytotoxic purine derivative, and thus perish in environments containing 6-MP. To assist others in implementing this technology, here we outline a procedure to delete a gene [as one example, we delete TK0566 (Walker et al., 2017)] from the T. kodakarensis TS559 genome.


Figure 1. Overview of the markerless deletion scheme used in T. kodakarensis. At the top of the figure is the B-plasmid used to delete the target gene from the genome. The plasmid recombines into the genome providing agmatine prototrophy to recipient cells and yields an intermediate genome. Two intermediate genomes are possible; however only one is depicted here. A second spontaneous recombination event excises plasmid sequences and permits survival in the presence of cytotoxic 6-MP. This second recombination event will result in the desired deletion genome (left) or the restoration of the TS559 genome (right).

Materials and Reagents

  1. 1 ml TB syringe (BD, catalog number: 309624 )
  2. 1.7 ml microcentrifuge tubes (VWR, catalog number: 490004-444 )
  3. 0.2 ml PCR tubes (VWR, catalog number: 20170-012 )
  4. Polystyrene Petri plates (Fisher Scientific, catalog number: S33580A )
  5. Split rubber stopper (DWK Life Sciences, Wheaton, catalog number: W224100-282 )
  6. 20 mm aluminum seals (DWK Life Sciences, Wheaton, catalog number: 224178-01 )
  7. 20 mm E-Z Crimper, Standard Seal (DWK Life Sciences, Wheaton, catalog number: W225303 )
  8. 20 mm E-Z Decapper (DWK Life Sciences, Wheaton, catalog number: W225353 )
  9. Polycarbonate centrifuge tubes (Beckman Coulter, catalog number: 361690 )
  10. Cell spreader (Fisher Scientific, catalog number: 08-100-10 )
  11. 10 ml serum bottles (DWK Life Sciences, Wheaton, catalog number: 223739 )
  12. Face shields, lab coats, and autoclave gloves
  13. Paper towels
  14. T. kodakarensis strain TS559 (Santangelo et al., 2010)
  15. DH5α E. coli competent cells (Thermo Fisher Scientific, InvitrogenTM, catalog number: 18258012 )
  16. XL1-Blue E. coli competent cells (Agilent Technologies, catalog number: 200228 )
  17. pTS700 (Hileman and Santangelo, 2012)
    Note: Please contact corresponding author to obtain plasmid.
  18. Agmatine (Sigma-Aldrich, catalog number: A7127 )
  19. Elemental sulfur (Aqua Solutions, catalog number: S8800-12KG )
  20. 10 mM Tris-HCl pH 8.0 (VWR, catalog number: 97061-258 )
  21. Isopropanol (Sigma-Aldrich, catalog number: 190764 )
  22. LE Quick dissolve agarose (VWR, catalog number: 490000-004 )
  23. Ethidium bromide (Sigma-Aldrich, catalog number: E1510 )
  24. AMPure XP (Fisher Scientific, catalog number: NC9959336)
    Manufacturer: Beckman Coulter, catalog number: A63880 .
  25. Nucleospin Gel and PCR Clean-up Kit (MACHERY-NAGEL, catalog number: 740609 )
  26. ZR Plasmid Miniprep kit (Zymo Research, catalog number: D4015 )
  27. T4 DNA polymerase (New England Biolabs, catalog number: M0203 )
  28. dGTP (Thermo Fisher Scientific, InvitrogenTM, catalog number: 10297018 )
  29. SwaI restriction enzyme (New England Biolabs, catalog number: R0604 )
  30. dCTP (Thermo Fisher Scientific, InvitrogenTM, catalog number: 10297018 )
  31. NEBuffer 2.1 (New England Biolabs, catalog number: B7202S )
  32. Taq DNA polymerase (New England Biolabs, catalog number: M0267 )
  33. dNTPs (Thermo Fisher Scientific, InvitrogenTM, catalog number: 10297018 )
  34. 700Forward primer (5’ CGCCGCAATAGCGGTCGTCGTCATGTTCCC 3’)
  35. 700Reverse primer (5’ AACAATTTCACACAGGAAACAGCTATGACC 3’)
  36. Plasmid Miniprep kit
  37. Quikchange II (Agilent Technologies, catalog number: 200523 )
  38. DpnI
  39. Gelzan (Sigma-Aldrich, catalog number: G1910 )
  40. Phusion DNA polymerase (New England Biolabs, catalog number: M0530 )
  41. 6-Methylpurine (Sigma-Aldrich, catalog number: M1256 )
    Note: This product has been discontinued.
  42. Polysulfides
  43. Phenol (AMRESCO, catalog number: 0945 )
  44. Chloroform (Sigma-Aldrich, catalog number: C2432 )
  45. Isoamyl alcohol (EMD Millipore, catalog number: 1009791000 )
  46. Tryptone (EMD Millipore, catalog number: 1072131000 )
    Note: T. kodakarensis requires casein peptone that is enzymatically digested using pancreatic enzymes. Other sources of tryptone are suitable for E. coli media.
  47. Yeast extract (AMRESCO, catalog number: J850 )
    Note: For E. coli media, any yeast extract is suitable, however T. kodakarensis requires this source of yeast extract.
  48. Sodium chloride (NaCl) (Sigma-Aldrich, catalog number: 793566 )
  49. Agar
  50. Ampicillin (Sigma-Aldrich, catalog number: A0166 )
  51. Niacin (Sigma-Aldrich, catalog number: PHR1276 )
  52. Biotin (AMRESCO, catalog number: 0340 )
  53. Pantothenate (Sigma-Aldrich, catalog number: 259721 )
    Note: This product has been discontinued.
  54. Lipoic acid (Fisher Scientific, catalog number: BP26821 )
    Note: This product has been discontinued.
  55. Folic acid (Sigma-Aldrich, catalog number: F7876 )
  56. P-aminobenzoic acid (Acros Organics, catalog number: 146210010 )
  57. Thiamine (Fisher Scientific, catalog number: BP892-100 )
  58. Riboflavin (Sigma-Aldrich, catalog number: R1706 )
    Note: This product has been discontinued.
  59. Pyridoxine (Sigma-Aldrich, catalog number: P9755 )
  60. Cobalamin (Sigma-Aldrich, catalog number: V6629 )
  61. Magnesium chloride hexahydrate (MgCl2·6H2O) (Sigma-Aldrich, catalog number: M9272 )
  62. Magnesium sulfate heptahydrate (MgSO4·7H2O) (EMD Millipore, catalog number: MX0070 )
  63. Ammonium sulfate ((NH4)2SO4) (VWR, catalog number: BDH9216 )
  64. Sodium bicarbonate (NaHCO3) (Sigma-Aldrich, catalog number: S6014 )
  65. Calcium chloride dihydrate (CaCl2·2H2O) (EMD Millipore, catalog number: CX0130 )
  66. Potassium chloride (KCl) (Sigma-Aldrich, catalog number: P3911 )
  67. Potassium phosphate monobasic (K2HPO4) (Sigma-Aldrich, catalog number: P0662 )
  68. Sodium bromide (NaBr) (Fisher Scientific, catalog number: S255 )
  69. Strontium chloride hexahydrate (SrCl2·6H2O) (Sigma-Aldrich, catalog number: 13909 )
    Note: This product has been discontinued.
  70. Ammonium iron(II) sulfate hexahydrate (Fe(NH4)2(SO4)2·6H2O) (Sigma-Aldrich, catalog number: F3754 )
  71. Manganese(II) sulfate monohydrate (MnSO4·H2O) (Fisher Scientific, catalog number: M114 )
  72. Cobalt(II) chloride hexahydrate (CoCl2·6H2O) (Sigma-Aldrich, catalog number: 202185 )
  73. Zinc sulfate heptahydrate (ZnSO4·7H2O) (RICCA Chemical, catalog number: RDCZ0200 )
  74. Copper(II) sulfate pentahydrate (CuSO4·5H2O) (Sigma-Aldrich, catalog number: C8027 )
  75. Aluminum potassium sulfate dodecahydrate (AlK(SO4)2·12H2O) (Fisher Scientific, catalog number: A605 )
  76. Boric acid (H3BO3) (Fisher Scientific, catalog number: A73 )
  77. Sodium molybdate dehydrate (Na2MoO4·2H2O) (Sigma-Aldrich, catalog number: S6646 )
    Note: This product has been discontinued.
  78. Sodium sulfide nonahydrate (Na2S·9H2O) (Sigma-Aldrich, catalog number: 431648 )
  79. Cysteine (Fisher Scientific, catalog number: BP377 )
  80. Glutamic acid (AMRESCO, catalog number: 0421 )
  81. Glycine (Sigma-Aldrich, catalog number: W328707 )
  82. Arginine (Sigma-Aldrich, catalog number: A5131 )
  83. Proline (Sigma-Aldrich, catalog number: W331902 )
  84. Asparagine (AMRESCO, catalog number: 94341 )
  85. Histidine (Sigma-Aldrich, catalog number: H8000 )
  86. Isoleucine (Sigma-Aldrich, catalog number: W527602 )
  87. Leucine (Sigma-Aldrich, catalog number: L8000 )
  88. Lysine (Sigma-Aldrich, catalog number: L5626 )
  89. Threonine (Sigma-Aldrich, catalog number: T8625 )
  90. Tyrosine (Sigma-Aldrich, catalog number: T3754 )
  91. Alanine (Sigma-Aldrich, catalog number: W381829 )
  92. Methionine (Sigma-Aldrich, catalog number: M9625 )
  93. Phenylalanine (Sigma-Aldrich, catalog number: P2126 )
  94. Serine (Sigma-Aldrich, catalog number: S8407 )
    Note: This product has been discontinued
  95. Tryptophan (AMRESCO, catalog number: E800 )
  96. Aspartic acid (AMRESCO, catalog number: 0192 )
  97. Glutamine (Sigma-Aldrich, catalog number: G3126 )
  98. Valine (Sigma-Aldrich, catalog number: V0500 )
  99. Phenol:Chloroform:Isoamyl Alcohol (25:24:1) (see Recipes)
  100. LB plates (see Recipes)
  101. LB-Amp plates (see Recipes)
  102. KOD Vitamins (see Recipes)
  103. ASW-YT media (see Recipes)
  104. 2x ASW solution (see Recipes)
  105. Trace minerals solution (see Recipes)
  106. Polysulfides (see Recipes)
  107. 0.8x ASW solution (see Recipes)
  108. 20 amino acid solution (see Recipes)

Equipment

  1. Eppendorf Microcentrifuge 5424 (Eppendorf, model: 5424 )
  2. 125 ml serum bottles (DWK Life Sciences, Wheaton, catalog number: 223748 )
  3. Noodle pot
  4. Autoclave
  5. Anaerobic chamber (Coy Labs)
  6. Glass Petri plates (VWR, catalog number: 89000-304 )
    Note: Glass Petri plates are used here, as many plastic Petri plates melt at T. kodakarensis incubation temperature (85 °C).
  7. Beckman Avanti J Series centrifuge system
  8. JLA10.500 rotor (Beckman Coulter, model: JLA10.500 , catalog number: 369681)
  9. Eppendorf Mastercycler Nexus Thermal cycler (Eppendorf, catalog number: 6333000022 )
  10. GasPak EZ Anaerobe Container System (BD, model: GasPakTM EZ, catalog number: 260678)
  11. Pipettes (Gilson, catalog numbers: F123600 , F123615 , F123602 )
  12. Enzyme Cooler, Isotherm System (Eppendorf, model: IsoTherm-System® start set, catalog number: 3880000011 )
  13. VWR forced air incubator (37 °C and 85 °C)
  14. Thermo MaxQ 4000 benchtop orbital shaker (Thermo Fisher Scientific, Thermo ScientificTM, model: MaxQTM 4000 )
  15. Dry block heater (VWR, catalog number: 12621-090 )

Software

  1. Primer3 (Untergasser et al., 2007)

Procedure

English
中文翻译

文章信息

版权信息

© 2017 The Authors; exclusive licensee Bio-protocol LLC.

如何引用

Gehring, A. M., Sanders, T. J. and Santangelo, T. J. J. (2017). Markerless Gene Editing in the Hyperthermophilic Archaeon Thermococcus kodakarensis. Bio-protocol 7(22): e2604. DOI: 10.21769/BioProtoc.2604.

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分类

微生物学 > 微生物遗传学 > DNA

微生物学 > 微生物遗传学 > 基因图谱和克隆

分子生物学 > DNA > 染色体工程

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