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Protocol

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Acknowledgements

Materials

References

Immunology and Infection

Coinkubations analyse til kvantificering af konkurrence interaktioner mellem Vibrio Stormhat isolater

Published: July 22nd, 2019

DOI:

10.3791/59759

1Department of Marine Sciences, University of North Carolina, Chapel Hill

Bakterier indkode forskellige mekanismer til at engagere sig i interbakteriel konkurrence. Her præsenterer vi en kultur baseret protokol til karakterisering af konkurrence interaktioner mellem bakterielle isolater, og hvordan de påvirker den rumlige struktur af en blandet befolkning.

Dette manuskript beskriver en kultur baseret, coinkubations analyse til påvisning og karakterisering af konkurrencemæssige interaktioner mellem to bakterie populationer. Denne metode anvender stabile plasmider, som gør det muligt for hver population at blive differentielt mærket med forskellige antibiotikaresistens kapaciteter og fluorescerende proteiner til udvælgelse og visuel diskrimination af hver population, hhv. Her beskriver vi forberedelsen og coinkubationen af konkurrerende Vibrio Stormhat -stammer, Fluorescens mikroskopi Imaging og kvantitativ dataanalyse. Denne fremgangsmåde er enkel, giver hurtige resultater, og kan bruges til at afgøre, om en population dræber eller hæmmer væksten i en anden population, og om konkurrencen er medieret gennem et diffusible molekyle eller kræver direkte celle celle kontakt. Fordi hver bakteriepopulation udtrykker et andet fluorescerende protein, tillader analysen den geografiske diskrimination af konkurrerende populationer i en blandet koloni. Selv om de beskrevne metoder udføres med symbiotisk bakterie V. Stormhat ved hjælp af betingelser, der er optimeret til denne art, kan protokollen tilpasses for de fleste bestemmelse antal kimtal bakteriel isolater.

Dette manuskript skitserer en kultur-baseret metode til at afgøre, om to bakterielle isolater er i stand til konkurrencemæssige interaktioner. Når man studerer blandede populationer, er det vigtigt at vurdere, i hvilket omfang de bakterielle isolater interagerer, især om isolater konkurrerer direkte gennem interferens mekanismer. Interferens konkurrence refererer til interaktioner, hvor en population direkte hæmmer væksten eller dræber en konkurrent befolkning1. Disse interaktioner er vigtige at identificere, fordi de kan have dybtgående virkninger på en mikrobiel samfund struktur og funktion2,3

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1. Forbered stammer til Coinkubation

  1. Vælg en passende referencestamme, der vil tjene som mål for bakteriel konkurrence under coinkukation assay. Se diskussionen om bedste praksis, når du vælger en referencestamme, og hvordan reference stammen vil påvirke resultaterne. I denne protokol vil V. Stormhat Strain ES114 tjene som referencestamme.
  2. Afgøre, hvilke udvælgelses-og screeningsmetoder der vil blive anvendt til at skelne mellem isolaterne i coinkubation

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For at vurdere den konkurrencemæssige interaktion mellem bakterie populationer blev der udviklet en coinkubations analyse protokol, som blev optimeret til V. Stormhat. Denne metode udnytter stabile plasmider at indkode antibiotikaresistensgener og fluorescerende proteiner, giver mulighed for differentiel udvælgelse og visuel diskrimination af hver stamme. Ved at analysere de data, der indsamles fra coinkubations analysen, kan det konkurrencemæssige resultat af en interaktion o.......

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Den coinkubations analyse, der er beskrevet ovenfor, giver en effektiv metode til at opdage interbakteriel konkurrence. Denne fremgangsmåde gjorde det muligt at identificere den intraspecifikke konkurrence mellem V. Stormhat isolater og karakteriseringen af konkurrence mekanismen19. Selv om den beskrevne metode blev optimeret til marine bakterien V. Stormhat, det kan nemt ændres til at rumme andre bakterielle arter, herunder kliniske og miljømæssige isolater. Det er vigtigt a.......

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Vi vil gerne takke anmeldere for deres nyttige feedback. A.N.S. blev støttet af Gordon og Betty Moore Foundation gennem Grant GBMF 255,03 til Life Sciences Research Foundation.

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NameCompanyCatalog NumberComments
1.5 mL Microcentrifuge TubesFisher05-408-129
10 μL multichannel pipette
100 μL multichannel pipette
300 μL multichannel pipette
10 μL single channel pipette
20 μL single channel pipette
200 μL single channel pipette
1000 μL single channel pipette
24-well platesFisher07-200-84sterile with lid
96-well platesVWR10062-900sterile with lid
Calculator
ChloramphenicolSigmaC0378stock (20 mg/mL in Ethanol); final concentration in media (2 μg /mL LBS)
Fluorescence dissecting microscope with camera and imaging software
forcepsFisher08-880
Kanamycin SulfateFisherBP906-5stock (100 mg/mL in water, filter sterilize); final concentration in media (1 μg/mL LBS)
Nitrocellulose membrane (FS MCE, 25MM, NS)FisherSA1J788H50.22 μm nitrocellulose membrane (pk of 100)
petri platesFisherFB0875713sterile with lid
Spectrophotometer
Semi-micro cuvettesVWR97000-586
TipOne 0.1-10 μL starter systemUSA Scientific1111-350010 racks
TipOne 200 μL starter systemUSA Scientific1111-50010 racks
TipOne 1000 μL starter systemUSA Scientific1111-252010 racks
Vortex
NameCompanyCatalog NumberComments
LBS media
1M Tris Buffer (pH ~7.5)50 mL 1 M stock buffer (62 mL HCl, 938 mL DI water, 121 g Trizma Base)
Agar TechnicalFisherDF0812-17-915 g (Add only for plates)
DI water950 mL
Sodium ChlorideFisherS640-320 g
TryptoneFisherBP9726510 g
Yeast ExtractFisherBP9727-25 g

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