Custom primers on the MiniSeq
Using Custom Primers on the MiniSeq System
When using custom primers with the MiniSeq, it is important to follow specific setup procedures to ensure successful sequencing. This article outlines how to specify and load custom primers, primer position assignments, and key contingencies related to the dual-indexed workflow.
Specifying Custom Primers
Custom primers must be designated during run setup:
Via MiniSeq Control Software: During run setup, if using the dedicated custom primer wells.
Via Local Run Manager (LRM): On the Create Run screen, select the checkboxes for each custom primer being used (Read 1, Index 1, Index 2, Read 2). This ensures the system recognizes and uses the correct wells for custom primers.
The system uses the Primers.xml
file to record which primer positions were used. This file is located in the Reagents folder of the run directory.
Primer Position Assignments
Primer Type
Position
Description
Custom Primers
15
Custom Read 1 Primer
14
Custom Read 2 Primer
13
Custom Index 1 and Index 2 Primers
Illumina Primers
24
Illumina Read 1 Primer
25
Illumina Read 2 Primer
28
Illumina Index 1 and Index 2 Primer Mix
Note: If Illumina primers are not used for Read 1 or Read 2, the optional Illumina PhiX control library will not be sequenced.
Primer Contingencies & Compatibility
Due to the dual-indexed sequencing workflow on the MiniSeq, users must load complementary primers when using custom primers for any read. This ensures proper sequencing chemistry and data quality.
If using a custom Read 1 primer, you must also load the reverse complement of the Index 2 primer.
If using a custom Read 2 primer, you must also load the reverse complement of the Index 1 primer.
In most cases, failure to load the appropriate complementary primer will result in sequencing failure or incomplete data.
MiniSeq Standard Reagent Kits
Combination
Read 1 Primer
Index 1 Primer
Index 2 Primer
Read 2 Primer
All Illumina
Illumina Read 1
Illumina Index 1
Illumina Index 2
Illumina Read 2
Custom Read 1
Custom Read 1
Custom Index 1
Custom Index 2
Illumina Read 2
Custom Read 2
Illumina Read 1
Custom Index 1
Custom Index 1
Custom Read 2
All Custom
Custom
Custom
Custom
Custom
See the MiniSeq System Custom Primer Guide for MiniSeq Rapid Reagent Kit Compatible Primer Combinations.
Primer Preparation and Loading
Dilution: Use HT1 buffer to dilute primers to 0.3 µM in 2 ml total volume.
Loading:
Load 1 ml of each primer into the designated well.
If using custom primers for both index reads, load 0.5 ml of each into position 13.
Custom Primer Loading Volumes by Position
Position
Volume
Primer Description
15
1 ml
Custom Read 1 Primer
14
1 ml
Custom Read 2 Primer
13
1 ml
Custom Index 1 Primer
13
0.5 ml each
Custom Index 1 Primer and Custom Index 2 Primer
13
1 ml
Custom Index 2 Primer
For more information, see MiniSeq System Custom Primer Guide.
For any feedback or questions regarding this article (Illumina Knowledge Article #2029), contact Illumina Technical Support [email protected].
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