Comprehensive Genome and Transcriptome Structural Analysis of a Breast Cancer Cell Line using PacBio Long Read Sequencing
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1 Comprehensive Genome and Transcriptome Structural Analysis of a Breast Cancer Cell Line using PacBio Long Read Sequencing Maria Nattestad Schatz + McCombie + Hicks at Cold Spring Harbor Laboratory McPherson + Beck at the Ontario Institute for Cancer Research Pacific Biosciences DNAnexus
2 SK- BR- 3 Most commonly used Her2- amplified breast cancer cell line 80 chromosomes instead of 46 OIen used for pre- clinical research on Her2- targekng therapeukcs such as HercepKn (Trastuzumab) and resistance to these therapies. (Davidson et al, 2000)
3 PacBio long- read DNA sequencing mean read length: 9 kb max read length: 71 kb 72X coverage coverage Genome- wide coverage averages around 54X Coverage per chromosome varies greatly as expected from previous karyotyping results
4 Genome structural analysis Assembly- based Alignment- based Assembly with Falcon on DNAnexus Alignment with BWA- MEM Alignment with MUMmer Copy number analysis SV- calling from split reads with Sniffles Call variants between consecukve alignments with ABVC Call variants within alignments with ABVC ~ 11,000 local variants 50 bp < size < 10 kbp ValidaKons 661 long- range variants (>10kb distance) SplitThreader Detailed analysis of Her2 amplificakons
5 Genome structural analysis Assembly- based Alignment- based Assembly with Falcon on DNAnexus Alignment with BWA- MEM Alignment with MUMmer Copy number analysis SV- calling from split reads with Sniffles Call variants between consecukve alignments with ABVC Call variants within alignments with ABVC ~ 11,000 local variants 50 bp < size < 10 kbp ValidaKons 661 long- range variants (>10kb distance) SplitThreader Detailed analysis of Her2 amplificakons
6 Assembly using PacBio yields far befer conkguity PacBio + Falcon Number of sequences: 13,532 Total sequence length: 2.97Gb Mean: 266 kb Max: 19.9 Mb N50: 2.46 Mb Illumina + Allpaths- LG RelaKve to a genome size of 3 Gb Number of sequences: 748,955 Total sequence length: 2.07 Gb Mean: 2.8 kb Max: 61 kb N50: 3.3 kb
7 ABVC: Assembly- Based Variant- Caller Defined point InserKon DeleKon reference reference conkg conkg Overlapping alignments suggest tandem repeat Tandem Expansions reference conkg Tandem ContracKons reference conkg Gap where sequences do not align uniquely suggests a repeat Repeat Expansions reference conkg Repeat ContracKons reference conkg
8 ~ 11,000 local variants 50 bp < size < 10 kbp
9 Repeat ContracKons reference conkg Repeat Expansions reference conkg BLASTed 515 inserkons: 427 (83%) of them matched Alu elements
10 Genome structural analysis Assembly- based Alignment- based Assembly with Falcon on DNAnexus Alignment with BWA- MEM Alignment with MUMmer Copy number analysis SV- calling from split reads with Sniffles Call variants between consecukve alignments with ABVC Call variants within alignments with ABVC ~ 11,000 local variants 50 bp < size < 10 kbp ValidaKons 661 long- range variants (>10kb distance) SplitThreader Detailed analysis of Her2 amplificakons
11 Split- read variant calling with Sniffles to capture the long- range variants chromosome 2 chromosome 1 See Fritz at Poster 183
12 Long- range structural variants found by Sniffles Her2 oncogene 661 long- range variants (>10kb distance)
13 Her2 Chr 17: 83 Mb 8 Mb
14 Her2 Her2
15 8 Mb Chromosome 17 Her2 GSDMB RARA PKIA TATDN1
16 SplitThreader: Graphical threading to retrace complex history of rearrangements in cancer genomes 20 CHR 1 CHR 2 ATCGCCTA GTCCATAG 80 CHR 1 ATCG 20 CCGA 100 CHR 2 GTCC ATAG
17 Her2 GSDMB RARA Chr 17 Chr 8 1. Healthy chromosome TranslocaKon into chromosome 8 3. TranslocaKon within chromosome 8 4. Complex variant and inverted duplicakon within chromosome 8 5. TranslocaKon within chromosome 8 PKIA TATDN1
18 Transcriptome analysis with IsoSeq: Long- read RNA sequencing Full- length transcripts Found 17 gene fusions with both DNA and RNA evidence 13 seen in previous RNA- seq literature 4 novel fusions 2 previously observed fusions had RNA evidence but no direct link in the DNA Confirmed using SplitThreader
19 CYTH1- EIF3H gene fusion in the SplitThreader graph CYTH1 EIF3H
20 CYTH1- EIF3H gene fusion in the SplitThreader graph CYTH1 EIF3H CYTH1 EIF3H
21 Frankensteining the CYTH1- EIF3H gene fusion CYTH1 EIF3H
22 CYTH1- EIF3H gene fusion Chr 17 CYTH1 CYTH1 EIF3H? IsoSeq reads 3.7 Mb Chr 8 EIF3H 8 kb
23 The genome informs the transcriptome Explain amplificakons Trace gene fusions More genomes coming soon! Data and addikonal results: hfp://schatzlab.cshl.edu/data/skbr3/
24 Acknowledgments Sara Goodwin Timour Baslan Fritz Sedlazeck Tyler Garvin Han Fang James Gurtowski Philipp Rescheneder Elizabeth Hufon Marley Alford Melissa Kramer Eric Antoniou James Hicks Michael Schatz W. Richard McCombie Karen Ng Timothy Beck Yogi Sundaravadanam John McPherson Elizabeth Tseng Jason Chin
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