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Leading reference material for oncology NGS quality control
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The world leader in serving science
Mona Shahbazian, Staff Scientist
Kara Norman, Head of R&D
AcroMetrix® Brand
Building on the Genome in a Bottle for Oncology
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NGS Quality Control
CAP Checklist4
•Daily run controls needed
NY State2
•“Low positive control … containing multiple known somatic alterations of each kind”
CDC (Nex-StoCT)3
•Reference material characteristics:
•Complexity and different mutation types
•Most / all of variants
•“Synthetic constructs could be used for routine QC of each NGS run”
•What is needed for robust QC?
1.Dutch Society for Clinical Genetic Laboratory Diagnostics (VKGL): Humu 10.1001/22.368 (2013)
2.New York State Clinical Laboratory Evaluation Program (CLEP) Laboratory Standards.
3.Gargis AS, et al. Nature Biotechnology. 30, 1033–1036 (2012).
4.College of American Pathologists (CAP) Laboratory Accreditation Checklist
VKGL1
•“…a separate SNP control”
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Reference material for oncology
•Customer needs
•Clinically relevant variants
•Various lengths of indels up to ~40 nt
•Minimize real-estate on chip/flow cell
•High quality/robustness for clinical use
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Overlapping Variants Problematic for Variant Calling
• 7 KRAS mutant cell lines + 1 WT cell line
• Extracted genomic DNA and mixed at equal conc.
6 or 12%
Expected
Observed
275 280 281 282 283 284 285
T G C C A C C
T A A
G G
T T
A,G (5%) 8 MNVs (5%) T,A,G (3.85%) 7 MNVs (20%) 14 MNVs (19%) G,A,T (55%)
T G C C A C C
A A A C A A
G C G G G G
T T T T T
7 SNVs
29 MNVs
3 SNVs
3.9-55%
Ref
Alt
Ref
Alt
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AcroMetrix® Oncology Hotspot Control
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• MegaMix Technology
• Built on Genome in a Bottle material
• GM24385 cell line
• ~550 Common variants
• Low frequencies
• Confirmed by Sanger
• Multiple NGS platforms
• CE-IVD, US-IVD
Length (bp)
0
10
20
30
40
10
0
20
30
40
5 0 4 S N V 2 M N V 2 9 D E L E T I O N S
1 C O M P L E X I N D E L
1 9 I N S
For In Vitro Diagnostic Use
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Performance tested at >30 external sites
2 control lots
Ion AmpliSeq™ Cancer Hotspot Panel v2 (CHPv2)
TruSeq® Amplicon Cancer Panel (TSACP)
TruSight® Tumor Panel (TSTP)
Each laboratory is required to establish its own performance specifications
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Run controls are important in QC monitoring
•High coverage does not guarantee variant detection
•Routine use of standardized material helps track run performance
Mean Depth
9k
47k
32k
29k
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How else can this technology assist labs with quality assurance?
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Massively parallel LOD study
3%
1
2
1
2
1
2
1
2
1
2
1
2
dPCR assigned value
Run #
550 Variants
Samples
ND
0.5%
70%
5%
11%
18%
30%
48%
Frequency
•Variants drop out at different levels
•Multiplexing minimizes runs/preps
•12 libraries (versus hundreds)
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Standardized controls allow users to track performance
•Variant context affects performance
•Important to test variants in regions of interest rather than generic variants
•Bioinformatics/post-VCF filtering impact results
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Stability - AcroMetrix® Oncology Hotspot Control
•-20C or below for 18 months
•Stable through five freeze-thaw cycles
•4C for 6 days (open vial stability)
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Hotspot Control Summary
•Variant Distribution
5-15%
15-35%
genomic
Complex
0
1
0
DEL
15
14
0
INS
9
8
2*
MNV
0
2
0
SNV
317
155
32*
•Subset of variants covered by different panels
* genomic variants supported by whole genome sequencing data (Complete Genomics)