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Mutation Explorer® ... A Clinical
Tool
Analysis courtesy of Dr. Yidong Bai, Assistant Professor,
University of Texas Health Center, San Antonio TX

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Accuracy of the software in the
bi-directional analysis mode is over 99%, with sensitivity
to greater than 5% of the primary peak. |
Mutation Explorer processes up to 48 lanes, 24 bi-directional,
of patient DNA sequence traces. Data input can be from either slab
gel or capillary sequencers, using either terminator or primer
chemistries. The detection parameters in Explorer have been “sealed” to
provide analyst to analyst consistency.
We have built Explorer for ease of use, and quick learning. Normal operation
involves only two steps: data input, (Genbank, references and patient traces)
followed by review of the differences of the patient to reference as indicated
in the mutation electropherogram. Most analysts have found, after becoming
familiar with the program’s performance, that peak to peak review of
the traces is no longer necessary.
The software automatically forms contigs, performs alignments
and mutation detection comparing both forward and reverse patient
traces to reference or normal traces. Homozygote and Heterozygote
mutations are indicated by sharp peaks in our exclusive mutation
electropherogram.
Enhanced Indel Detection
Assembly and Alignment: SoftGenetics’ Robust Alignment algorithm
has been complemented by another product based algorithm. The new
technology utilizes a moving window throughout the sequence trace
continually matching the sample peaks to those of the reference.
When alignment ceases, program begins to “gap” either
sample or reference trace until alignment is restored.

Enhanced detection algorithm
allows routine detection of 1bp indels and multiple
indels.

Mutation Surveyor/Explorer’s
new alignment engine will correctly align traces
containing up to 10% variation from reference,
making them excellent tools for plants and other
multi variant sequence traces.
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Homozygote Detection
Homozygote Variants are detected when the color
of the reference drops 100% being replaced in the same spatial position
by a second color in the sample or patient. |
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Heterozygote Detection
The software detects heterozygote variants
by detecting a color drop in the patient/sample base,
while a second wave-length is observed in the same
spatial position and proportion. |
Insertions and deletions are found by comparing the migration
time of the sample to that of the reference, eliminating the false
and over calls of text based comparison software, providing an
extremely low false "false" positive rate. In the event
that a heterozygote insertion or deletion is detected, the software
will de-convolute patient trace following frame shift into two
clean traces, while continuing with the mutation detection.

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Insertion Detection |
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Deletion Detection |
Mutation Surveyor and Explorer
monitor the migration time of the DNA fragments in comparison
to the references. If the program detects a change in the
migration time, the center line turns from green to red indicating
the presence of an insertion or deletion. The software then
re-aligns the traces, to calculate the Indel.
The position of the Indel is indicated
by the heavy red line. |
Assembly of a “whole gene” mutational analysis is
easily accomplished. To assemble the mutational analysis of an
entire gene simply enter the Genbank data, pre-analyzed fragments,
and the software will assemble, providing the locations of the
found variants in bp order, and calculate an allele frequency.
Reporting is extremely user-friendly with several customer customizable
reporting formats, or the customer can easily cut and paste areas
of interest to any graphics capable program such as Microsoft Word.
Reports can be easily exported in text, XML or HTML formats. Click
here to see examples of the reporting feature.
Mutation Explorer is priced to be affordable. The 48 lane program
is available to institutions for $2,950.00.
To learn more regarding the program’s operation and capabilities, please
review the video manual.
Application Note
Somatic Mutation Detection Technical Note [pdf]
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