Download - Cell Sorting _Flow Cytometry
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Why do we need Cell sorting ?
Heterogeneous samples provide problems for researcher as the presence of non target cells can affect results
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What is Cell sorting ?
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Methods of Cell Sorting
• Panning
• Magnetic bead selection
• Laser Capture microdisection
• Microfluidics
• Flow Cytometry based cell Sorting
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Cell Sorting using Flow Cytometry
Mechanical
•Uses a mechanical arm to catch cells of interest
Electrostatic/ droplet
•Electrically charges droplets containing the cells of interest
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History of droplet Cell Sorting
Mark Fulwyer modifies the coulter counter to allow sorting (1965)
Mark Fulwyer and Van Dyller begin using fluorescence detection (1967)
BD releases 1st commercial cell sorter (1973/4)
Beckman Coulter releases Epics (1977/8)
Argon Ion laser introduced – replaced mercury lamp (1972)
Dick Sweet Joins Herzenberg lab (1971)
Nasa funding finishes, NIH funding begins (1969)
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Droplet Creation
Aria – 100um
SettingsAmpl = Amplitude (how hard the stream is being vibrated)
Freq = Frequency (how many droplets are being created per second – in KHz)
Drop 1 = Arbitrary point of first separated drop (measures in pixels but must be a known time offset from the trigger)
Gap = distance between drops ( in Pixels) – used for stream monitoring
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Full Stream Overview
Influx 100um stream Amplitude ≈ 3.5Frequency = 39.00Pressure =24 PSI
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Full Stream Overview
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Full Stream Overview
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Full Stream Overview
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Full Stream Overview
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Full Stream Overview
Last drop before break off
First break off drop
Satellite drop
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Full Stream Overview
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Sort process 1. Particle enters stream
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Sort process 1. Particle enters stream2. Particle triggers detectors
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Sort process 1. Particle enters stream2. Particle triggers lasers3. Particle progresses down the
stream
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Sort process 1. Particle enters stream2. Particle triggers lasers3. Particle progresses down the
stream 4. Particle enters last drop before
breakoff
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Sort process 1. Particle enters stream2. Particle triggers lasers3. Particle progresses down the
stream 4. Particle enters last drop before
breakoff 5. Stream is charged
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Sort process 1. Particle enters stream2. Particle triggers lasers3. Particle progresses down the
stream 4. Particle enters last drop before
breakoff 5. Stream is charged6. Droplet containing target particle
separates from stream and retains charge
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Sort process 1. Particle enters stream2. Particle triggers lasers3. Particle progresses down the
stream 4. Particle enters last drop before
breakoff 5. Stream is charged6. Droplet containing target particle
separates from stream and retains charge
7. Stream is earthed
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Sort process 1. Particle enters stream2. Particle triggers lasers3. Particle progresses down the
stream 4. Particle enters last drop before
breakoff 5. Stream is charged6. Droplet containing target particle
separates from stream and retains charge
7. Stream is earthed8. Charged droplet enters electric
field and is deflected
+++
---
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Sort process 1. Particle enters stream2. Particle triggers lasers3. Particle progresses down the
stream 4. Particle enters last drop before
breakoff 5. Stream is charged6. Droplet containing target particle
separates from stream and retains charge
7. Stream is earthed8. Charged droplet enters electric
field and is deflected 9. Particle collected
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Sort process
Its NOT Magic
but a good sort outcome doesn’t happen automatically
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Key Criteria for a Successful Sort
Instrument setup
Sample Preparation
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Key Criteria for a Successful Sort
Instrument setup• Nozzle choice
• Laser alignment and delay
• Drop delay - (set in drops but is actually a time figure)
• Collection vessel targeting
• Sort masks
Sample Preparation
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Sort Masks
Yield Sort more drops
PurityAborts drop sort
Phase Aborts drop sort
BD FACSAria Users Guide
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Key Criteria for a Successful Sort
Instrument setup• Laser alignment and delay • Nozzle choice• Drop delay• Collection vessel targeting• Sort masks
Sample Preparation• Sample must be single cell• Match the cell concentration to the instrument setup and cell
type• Stains should be fully worked up prior to sorting • controls are important
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Tips for good purities
• Ensure good sample prep• Always use multiple doublet discrimination gates• Poorly separated populations cause uncertainty in
population discrimination• Try to include both positive and negative selection
criteria• The more criteria for selection the better
• Never sort on an unstable stream
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Useful Details