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Assuming you sequence one 96-well plate:
How many cell barcodes are needed for a single lane?
How many cell barcodes are needed if you combine 10 plates into a single sequencing lane?
What would be the minimum length of the barcodes for each of the previous questions?
Assuming you sequence one 96-well plate:
How many cell barcodes are needed for a single lane?
How many cell barcodes are needed if you combine 10 plates into a single sequencing lane?
What would be the minimum length of the barcodes for each of the previous questions?
3) What would be the minimum length of the barcodes for each of the previous questions?
A single lane?
Barcodes | Result |
---|---|
42=16 | No, 2 bases is not enough |
43=64 | No, 3 bases is not enough |
44=256 | Yes, 4 bases is enough to cover 96 barcodes (and more!) |
3) What would be the minimum length of the barcodes for each of the previous questions?
A single lane?
Barcodes | Result |
---|---|
42=16 | No, 2 bases is not enough |
43=64 | No, 3 bases is not enough |
44=256 | Yes, 4 bases is enough to cover 96 barcodes (and more!) |
10 plates in a single lane?
Barcodes | Result |
---|---|
44=256 | No, 4 bases is not enough |
45=1024 | Yes, 5 bases is enough to cover 960 barcodes (just barely!) |
Sequencing errors can change the cell barcode
To guard against a 1 bp sequencing error, need to space barcodes by 2 bp
How many barcodes for a cell barcode of length 5 bp (ED = 2)?
Edit Distance = 2 bp
AAAAA AAACC AAAGG AAATT AACCA AAGGA AATTA ····CCCCC CCCAA CCCGG CCCTT CCCAA CCGGC CCTTC ···· · · ·
Sequencing errors can change the cell barcode
To guard against a 1 bp sequencing error, need to space barcodes by 2 bp
How many barcodes for a cell barcode of length 5 bp (ED = 2)?
Edit Distance = 2 bp
AAAAA AAACC AAAGG AAATT AACCA AAGGA AATTA ····CCCCC CCCAA CCCGG CCCTT CCCAA CCGGC CCTTC ···· · · ·
45−1=512
e.g. For barcodes of length N=3:
Edit Distance of E=1:
AAA AAC AAG AAT ACA ACC
...
64 barcodes
Edit Distance of E=2:
AAA ACC AGG ATT CAA CCC
...
16 barcodes
Edit Distance of E=3:
AAA CCC GGG TTT
4 barcodes
Number of Barcodes :
4N−(E−1)
For barcodes of length N, and Edit Distance of E.
Barcodes typically limited to 4 main bases {A,C,T,G}.
Number of available barcodes depends on:
The length of the barcode
The edit distance between adjacent barcodes
Must take sequencing errors into account
Availability is balance between barcode size vs. sequencing errors
Typically between 4-10 bases, range of cells that can be labelled:
[44,410]=[256,1048576]
Is it better to use Longer or Shorter Barcodes?
Longer | Shorter |
---|---|
Offer larger range of barcodes | Offer smaller range of barcodes |
Prone to more sequencing errors | More robust against sequencing errors |
Must increase edit distance significantly | A smaller edit distance is more acceptable |
Can accommodate large edit distances | Cannot accommodate large edit distances |
A single barcode sequence indexes a single cell
Every transcript in a specific cell has the same cell barcode
Barcodes are designed for smaller plate-based protocols, while for split-pool and similar techniques they are randomised.
Barcode use is limited by length and read depth
A single barcode sequence indexes a single cell
Every transcript in a specific cell has the same cell barcode
Barcodes are designed for smaller plate-based protocols, while for split-pool and similar techniques they are randomised.
Barcode use is limited by length and read depth
Edit Distance | vs. | Barcode Length |
Number of Barcodes | vs. | Plate and Lane Size |
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This material is the result of a collaborative work. Thanks to the Galaxy Training Network and all the contributors!
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Tutorial Content is licensed under Creative Commons Attribution 4.0 International License.
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