Troubleshooting
7-4
PyroMark Q24 MDx User Manual 01/2016
Comments and suggestions
m) Unusually high
consumption of
substrate (noted as
a high
presequencing
signal)
Prepare samples according to the instructions in
Section 5.3.
Change buffers and do not use any other buffers
than those supplied by QIAGEN.
Check if any peaks have been generated using
the zoom in function (select a stretch of Pyrogram
with the left mouse button).
n) Crosstalk (light from
one well appears in
the neighboring
well)
Avoid placing assays with high signals close to
assays with low signals.
o) Dispensation error Replace the reagent cartridge. If the problem
remains, contact QIAGEN Technical Services.
p) Unknown SNP in
sample
Insert the SNP in the sequence to analyze and
regenerate the dispensation order. Rerun the
sample with the new dispensation order.
q) dUTP used in the
PCR reaction
Replace dUTP with dTTP since the A nucleotide
used in Pyrosequencing reactions binds less
stringently to dUTP.
r) Plus shift
Change the dispensation order.
s) Minus shift
Ensure that homopolymers are followed by an
extra dispensation.
7.2
Analysis software-related errors
For errors related to the analysis software, see the
Troubleshooting Guide section of the
PyroMark Q24 MDx
Software User Guide
.
Summary of Contents for PyroMark Q24 MDx
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