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. 2018 Jul 26;174(3):758-769.e9.
doi: 10.1016/j.cell.2018.06.039. Epub 2018 Jul 19.

Genomic Hallmarks and Structural Variation in Metastatic Prostate Cancer

Affiliations

Genomic Hallmarks and Structural Variation in Metastatic Prostate Cancer

David A Quigley et al. Cell. .

Erratum in

  • Genomic Hallmarks and Structural Variation in Metastatic Prostate Cancer.
    Quigley DA, Dang HX, Zhao SG, Lloyd P, Aggarwal R, Alumkal JJ, Foye A, Kothari V, Perry MD, Bailey AM, Playdle D, Barnard TJ, Zhang L, Zhang J, Youngren JF, Cieslik MP, Parolia A, Beer TM, Thomas G, Chi KN, Gleave M, Lack NA, Zoubeidi A, Reiter RE, Rettig MB, Witte O, Ryan CJ, Fong L, Kim W, Friedlander T, Chou J, Li H, Das R, Li H, Moussavi-Baygi R, Goodarzi H, Gilbert LA, Lara PN Jr, Evans CP, Goldstein TC, Stuart JM, Tomlins SA, Spratt DE, Cheetham RK, Cheng DT, Farh K, Gehring JS, Hakenberg J, Liao A, Febbo PG, Shon J, Sickler B, Batzoglou S, Knudsen KE, He HH, Huang J, Wyatt AW, Dehm SM, Ashworth A, Chinnaiyan AM, Maher CA, Small EJ, Feng FY. Quigley DA, et al. Cell. 2018 Oct 18;175(3):889. doi: 10.1016/j.cell.2018.10.019. Cell. 2018. PMID: 30340047 No abstract available.

Abstract

While mutations affecting protein-coding regions have been examined across many cancers, structural variants at the genome-wide level are still poorly defined. Through integrative deep whole-genome and -transcriptome analysis of 101 castration-resistant prostate cancer metastases (109X tumor/38X normal coverage), we identified structural variants altering critical regulators of tumorigenesis and progression not detectable by exome approaches. Notably, we observed amplification of an intergenic enhancer region 624 kb upstream of the androgen receptor (AR) in 81% of patients, correlating with increased AR expression. Tandem duplication hotspots also occur near MYC, in lncRNAs associated with post-translational MYC regulation. Classes of structural variations were linked to distinct DNA repair deficiencies, suggesting their etiology, including associations of CDK12 mutation with tandem duplications, TP53 inactivation with inverted rearrangements and chromothripsis, and BRCA2 inactivation with deletions. Together, these observations provide a comprehensive view of how structural variations affect critical regulators in metastatic prostate cancer.

Keywords: BRCA2; androgen receptor; castration resistant prostate cancer; chromothripsis; gene fusion; genomics; metastases; structural variation; tandem duplication; whole-genome sequencing.

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Conflict of interest statement

DECLARATION OF INTERESTS

A.M.C. is on the scientific advisory board of Tempus. F.Y.F. is co-founder of PFS Genomics. R.K.C., D.T.C., K.F., J.S.G., J. H., A.L., J.S., S.B., and P.F. are employees of Illumina Inc and hold stock in the company. The University of Michigan has been issued a patent on ETS gene fusions in prostate cancer on which A.M.C. and S.A.T. are co-inventors. The diagnostic field of use has been licensed to Hologic/Gen-Probe, Inc., which has sublicensed rights to Roche/Ventana Medical Systems. S.A.T. has an unrelated sponsored research agreement with Astellas. S.A.T. has served as a consultant for and received honoraria from Almac Diagnostics, Janssen, and Astellas/Medivation. S.A.T. is a co-founder of, consultant for and Laboratory Director of Strata Oncology.

Figures

Figure 1.
Figure 1.
Structural Variants Disrupt Tumor Suppressors and Activate Oncogenes (A) SV and copy number frequency plotted on scaled chromosomes. Wider green/blue bars indicate more frequent copy gain/loss. Darker black bars indicate more frequent SV. (B) Top: expression levels of PTEN, TP53, RB1, CDKN1B, and CHD1 in individual samples reported as (log[1+(TPM × 10^6)]). Bottom: somatic events affecting each sample. Right: box and whisker plots showing expression for samples with 0, 1, or 2 alleles affected; horizontal bar indicates median. Each gene was sorted independently by expression level. See also Figure S3. (C) Schematic diagrams of ETS family fusions indicating previously observed and novel partners. See also Figure S3. (D) Schematic diagram of ETV1 activation via RP11-35609.1 fusions. See also Figure S4. (E) Schematic diagrams of oncogene fusions showing previously observed and novel partners. See also Figure S2 and Tables S1, S2, S3, and S5.
Figure 2.
Figure 2.
Tandem Duplication Target Enhancers near AR, MYC, and FOXA1 (A) Aligned tracks showing the DNA amplification frequency (top), tandem duplication frequency (middle), tandem duplication bounds (middle), and H3K27ac average read coverage (bottom, from Kron et al., 2017) at the AR locus. (B) Box and whisker plot showing AR expression in the presence/absence of DNA amplification at AR or at the peak. (C) Samples with tandem duplication of the peak in (A) but not AR (red) more frequently had AR unamplified or amplified at low levels. (D and E) aligned tracks showing tandem duplications near MYC (D) and FOXA1 (E) as in (A). See also Table S4.
Figure 3.
Figure 3.
DNA Repair Alterations Are Associated with Structural Variation Frequency (A) Top: structural variant frequency by sample, sorted by deletion frequency. Bottom: presence of chromothripsis or biallelic inactivating alterations in BRCA2, CDK12, or TP53. (B) Circos plots illustrating BRCA2 inactivation (left), CDK12 inactivation (center), and chromothripsis (right). Colors as in (A). (C) Box and whiskers plots showing association between biallelic inactivating alterations in BRCA2, CDK12, or TP53 and the frequencies of deletions, tandem duplications, and inverted rearrangements respectively. See also Figure S5. (D) Counts of inverted rearrangements and deletions per sample. Samples with biallelic BRCA2 loss drawn in blue, samples bearing chromothripsis drawn in orange. (E) Box and whisker plots showing mutation frequency in the presence of biallelic loss of BRCA2 and chromothripsis. See also Table S1.
Figure 4.
Figure 4.
Mutational Signatures of DNA Damage in mCRPC (A) From top to bottom: the frequency of deletions bearing two or more nucleotides of microhomology; fit of mutation signatures COSMIC 3 and 8 and de novo 8; alterations associated with DNA repair by homologous recombination. See also Figure S6. (B) Box and whisker plots showing mutation frequency in samples bearing either biallelic loss of BRCA2 or compound BRCA1-BRCA2 heterozygosity, compared to samples lacking either of these alterations. (C) Box and whisker plots showing COSMIC signature 3 fit in tumors bearing biallelic loss of BRCA2 and samples bearing compound BRCA1-BRCA2 heterozygosity.
Figure 5.
Figure 5.
Landscape of Somatic and Structural Alterations in mCRPC Mutation frequency (top) and germline or somatic alterations in key genes where such alterations were predicted to be functionally meaningful. Alteration frequency shown at right. See also Tables S3 and S5.

Comment in

  • Sequence of events in prostate cancer.
    Cotter KA, Rubin MA. Cotter KA, et al. Nature. 2018 Aug;560(7720):557-559. doi: 10.1038/d41586-018-06029-5. Nature. 2018. PMID: 30143757 No abstract available.

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