Principal Investigators


Dr Peter Stirling — PhD


Admin Contact

Christine Kelly

Senior Secretary
Research Interest
Lab Members
Lab Alumni

The Stirling lab is a vibrant research group embedded within the Terry Fox Laboratory at the BC Cancer Agency in Vancouver, Canada. The lab opened in 2014, and was rapidly populated by dynamic trainees working in the field of genome integrity maintenance. The group is highly collaborative with researchers in BC, across Canada, and around the world. We welcome inquiries from potential collaborators and from outstanding candidate trainees.

The Stirling lab aspires to:

(1) Be a hub of rigorous, valuable, and world-class research in the areas of genome dynamics, maintenance, and mutagenesis.

(2) Provide an exceptional training environment for students and fellows that will enable their success as scientists in academia, industry, education, and beyond.

Our work is funded by the British Columbia Cancer Foundation (BCCF), the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Institutes of Health Research (CIHR), the Canadian Cancer Society Research Institute (CCSRI), and the Terry Fox Research Institute (TFRI) and the Canada Foundation for Innovation (CFI). Please see our research overview, publications and team pages for more information.

About Dr. Stirling

With the exception of valuable training in California, Dr. Stirling is a life-long British Columbian. He grew up in Port Alberni, British Columbia and now resides in East Vancouver. He has a long-standing interest in the natural world and has been pursuing a career in the basic sciences for decades. Dr. Stirling is a CIHR New Investigator and a Michael Smith Foundation for Health Research Scholar. Details of his training are listed below.


Post-Graduate Training:

Professional Experience:


  • Biochemistry
  • Genetics
  • Cell biology
  • Functional genomics
  • Molecular mechanism
  • Translational and therapeutic anti-cancer application
  • Budding yeast
  • Synthetic lethality

My lab is using functional genomics, molecular biology, biochemistry, and advanced imaging in both the yeast model and cultured human cells to study fundamental mechanisms of genome maintenance and stability. Failure to maintain genome integrity leads to mutations that can promote tumour formation. Normal genome maintenance mechanisms can be overwhelmed by carcinogen exposure, or the presence of germline or somatic variants that induce genomic instability. Our work is aimed at determining the causes of genomic instability as an enabling characteristic of tumour formation, and exploring the potential of these early events to suggest novel therapeutic targets. Currently we are working on several projects, briefly outlined below.

Roles of RNA processing in genome maintenance

Functional genomic screening of the yeast model, Saccharomyces cerevisiae, and of mammalian cells has revealed that most steps in RNA metabolism (including transcription, processing, and decay) can cause genome instability when disrupted. In some cases it is clear that mutations in RNA processing factors lead to transcription-coupled DNA:RNA hybrids that form R-loops. R-loop structures expose damage-prone single-stranded DNA, and can also impede DNA replication fork progression, causing breaks. Importantly, not all genome destabilizing RNA processing mutants create R-loops, and we are also interested in defining these alternative mechanisms.

RNA processing mutations are now recognized to occur in various tumours. These include widely distributed and frequent mutations of the spliceosome (e.g. SF3B1 in hematopoietic malignancies), mutations in the RNA degrading exosome (e.g. DIS3), and mRNA processing genes (e.g. FIP1L1). The importance of these cancer-associated mutations for genome maintenance and the potential for R-loop formation to contribute to cancer cell phenotypes is also under investigation. Finally, some yeast RNA processing mutants exhibit synthetic lethality with cancer-associated genome maintenance genes, and therefore represent candidate therapeutic targets. We are exploring the conservation of such interactions and the potential for inhibiting aspects of RNA metabolism for therapeutic benefit.

DNA repair: mutation signatures and transcription-replication conflicts

Mutational processes leave a characteristic pattern of mutations on tumour genomes based on the underlying biology that is disrupted or the causative environmental agent. While elegant computational methods can extract such mutation ‘signatures’ from tumour genomes, the mechanisms are usually unknown. We have established a yeast model for linking specific genetic changes in conserved genome integrity pathways, and their interactions with genotoxic drugs, to patterns of accumulated mutations using whole genome sequencing. Yeast provides a clean and tractable genetic system whose genome can be sequenced in an efficient, cost-effective manner. These signatures have led to new insights to biochemical mechanisms of DNA repair (e.g. slippage and realignment in DNA translesion synthesis polymerases: bioRxiv 086512, doi: and to an appreciation that defects in DNA repair can increase transcription-replication conflicts.

Our observation that some DNA repair defects increase transcription-replication conflicts, likely due to R-loops impairing DNA replication, connects to a growing body of literature which links genome maintenance factors (e.g. BRCA2, XPF/XPG, the Fanconi Anemia pathway and p53) to the suppression of R-loop-mediated genome instability. Our group is actively pursuing various DNA repair proteins that can suppress R-loop formation in yeast and human cells. We are developing tools to directly probe the molecular mechanisms of these effects and screen for conditions which enhance R-loop formation genetically or chemically.

The global cellular response to genotoxic stress

We have a long-standing interest in how cells respond to environmental stress dating back to Dr. Stirling’s earliest research on molecular chaperones (c. 2002-2008). Currently, this work is focused on the ways in which RNA and protein quality control machinery respond to genotoxic chemicals. These pathways may  serve as chemoresistance mechanisms in the face of genotoxic cancer therapies. Using the yeast model, we have found that transcriptome changes following genotoxic stress directly regulate the constituents of protein aggregate structures. We believe that factors  ejected from chromatin due to the transcriptional upheaval of a stress response are captured by protein quality control machinery in order to promote adaptation and recovery. The interplay between transcriptome dynamics, protein quality control, and RNA quality control (i.e. through P-bodies and Stress Granules) is an active area of interest in the lab.








Seid-Karbasi P, Ye XC, Zhang AW, Gladish N, Cheng SY, Rothe K, Pilsworth JA, Kang MA, Doolittle N, Jiang X, Stirling PC & Wasserman WW. CuboCube: Student creation of a cancer genetics e-textbook using open-access software for social learning.  PLoS Biol 15: e2001192, 2017. View Abstract

Segovia R, Shen Y, Lujan SA, Jones SJ & Stirling PC. Hypermutation signature reveals a slippage and realignment model of translesion synthesis by Rev3 polymerase in cisplatin-treated yeast.  Proc Natl Acad Sci USA 114: 2663-2668, 2017. View Abstract

Xu H, Di Antonio M, McKinney S, Mathew V, Ho B, O'Neil NJ, Santos ND, Silvester J, Wei V, Garcia J, Kabeer F, Lai D, Soriano P, Banath J, Chiu DS, Yap D, Le DD, Ye FB, Zhang A, Thu K, Soong J, Lin SC, Tsai AH, Osako T, Algara T, Saunders DN, Wong J, Xian J, Bally MB, Brenton JD, Brown GW, Shah SP, Cescon D, Mak TW, Caldas C, Stirling PC, Hieter P, Balasubramanian S & Aparicio S. CX-5461 is a DNA G-quadruplex stabilizer with selective lethality in BRCA1/2 deficient tumors. Nat Commun 8: 14432 2017. View Abstract

Chang EY & Stirling PC.  Replication fork protection factors controlling R-loop bypass and suppression.  Genes (Basel) 8:  pii: E33. doi: 10.3390/genes8010033, 2017. View Abstract

Ang JS, Duffy S, Segovia R, Stirling PC & Hieter P. Dosage mutator genes in Saccharomyces cerevisiae: A novel mutator mode-of-action of the Mph1 DNA helicase.  Genetics 204: 975-986, 2016.  View Abstract

Measday V & Stirling PC. Navigating yeast genome maintenance with functional genomics.  Brief Funct Genomics 15: 119-129, 2016. View Abstract

Leung AW, Hung SS, Backstrom I, Ricaurte D, Kwok B, Poon S, McKinney S, Segovia R, Rawji J, Qadir MA, Aparicio S, Stirling PC, Steidl C & Bally MB.  Combined use of gene expression modeling and siRNA screening identifies genes and pathways which enhance the activity of Cisplatin when added at no effect levels to non-small cell lung cancer cells in vitro. PLoS One 11: e0150675, 2016.  View Abstract

Kofoed M, Milbury KL, Chiang JH, Sinha S, Ben Aroya S, Giaever G, Nislow C, Hieter P & Stirling PCAn updated collection of sequence barcoded temperature-sensitive alleles of yeast essential genes.  G3 (Bethesda) 5: 1879-1887, 2015. View Abstract

Leung AYW, Dragowska WH, Ricaurte D, Kwok B, Mathew V, Roosendaal J, Ahluwalia A, Warburton C, Laskin JJ, Stirling PC, Qadir MA & Bally MA.  3'-Phosphoadenosine 5'-phosphosulfate synthase 1 (PAPSS1) knockdown sensitizes non-small cell lung cancer cells to DNA damaging agents.  Oncotarget 6: 17161-17177, 2015.  View Abstract

Segovia R, Tam AS & Stirling PC.  Dissecting genetic and environmental mutation signatures with model organisims.  Trends Genet 31: 465-474, 2015.  View Abstract

Chan YA, Hieter P & Stirling PC. Mechanisms of genome instability induced by RNA processing defects.  Trends Genet  30: 245-253, 2014. View Abstract

Stirling PC, Shen Y, Corbett R, Jones SJ & Hieter P. Genome destabilizing mutator alleles drive specific mutational trajectories in Saccharomyces cerevisiae.  Genetics 196: 403-412, 2014. View Abstract

Chan YA, Aristizabal MJ, Lu YT, Luo Z, Hamza A, Kobor MS, Stirling PC & Hieter P. Genome-wide profiling of yeast DNA:RNA hybrid prone sites with DRIP-chip.  PLoS Genet 10: e1004288 2014. View Abstract

Sorgjerd KM, Zako T, Sakono M, Stirling PC, Leroux MR, Saito T, Nilsson P, Sekimoto M, Saido TC and Maeda M. Human prefoldin inhibits Amyloid β (Aβ) fibrillation and contributes to formation of non-toxic Aβ aggregates. Biochemistry. 52, 3532-3542, 2013. View Abstract

van Pel DM*, Stirling PC*, Minaker SW, Sipahimalani P and Hieter P. Saccharomyces cerevisiae genetics predicts candidate therapeutic genetic interactions at the mammalian replication fork. G3 (Bethesda) 3, 273-282, 2013 *Authors contributed equally. View Abstract

Minaker SW, Filiatrault MC, Ben-Aroya S, Hieter P and Stirling PC. Biogenesis of RNA polymerases II and III requires the conserved GPN small GTPases in S. cerevisiae. Genetics 193, 853-864, 2013. View Abstract

Stirling PC*, Chan YA*, Minaker SW*, Aristizabal MJ, Barrett I, Sipahimalani P, Kobor, MS and Hieter P. R-loop mediated genome instability in mRNA cleavage and polyadenylation mutants. Genes Dev. 26, 163-175, 2012 *Authors contributed equally. View Abstract

Stirling PC, Crisp MJ, Basrai MA, Tucker CM, Dunham MJ, Spencer FA and Hieter P. Mutability and mutational spectrum of chromosome transmission fidelity (Ctf) genes. Chromosoma 121, 263-275, 2012. View Abstract

Stirling PC, Bloom MS, Solanki-Patil T, Smith S, Sipahimalani P,  Li Z, Kofoed M, Ben-Aroya S, Myung K and Hieter P. The complete spectrum of yeast chromosome instability genes identifies candidate CIN cancer genes and functional roles for ASTRA complex components. PLoS Genet. 7, e1002057, 2011. *Faculty of 1000 rated. View Abstract

Lundin VF, Leroux MR* and Stirling PC*. Quality control of cytoskeletal proteins and human disease. Trends Biochem. Sci. Review. 35, 288-297, 2010. *Corresponding authors. View Abstract

Carroll SY*, Stirling PC*, Stimpson HE, Giesselman E, Schmitt MJ and Drubin DG. A yeast killer toxin screen provides insights into A/B toxin entry, trafficking and killing mechanisms. Dev. Cell 17, 552-560, 2009. *Authors contributed equally. *Faculty of 1000 rated. View Abstract

Dekker C*, Stirling PC*, Filmore H, McCormack EA, Pappenberger G, Paul A, Brost RL, Costanzo M, Boone C, Leroux MR and Willison KR. The interaction network of the chaperonin CCT. EMBO J. 27, 1837-1839, 2008.*Authors contributed equally. *Faculty of 1000 rated. View Abstract

Stirling PC, Srayko M, Takhar KS, Pozniakovsky A, Hyman AA and Leroux MR. Functional interaction between phosducin-like protein 2 and cytosolic chaperonin is essential for cytoskeletal protein function and cell cycle progression. Mol. Biol. Cell 18, 2336-2345, 2007. View Abstract

Martín-Benito J, Gómez-Reino J, Stirling PC, Lundin VF, Gómez-Puertas P, Boskovic J, Chacón P, Fernández JJ, Berenguer J, Leroux MR and Valpuesta JM. Divergent substrate-binding mechanisms reveal an evolutionary specialization of eukaryotic prefoldin compared to its archaeal counterpart. Structure 15, 101-110, 2007. View Abstract

Stirling PC, Bakhoum SF, Feigl AB and Leroux MR. Convergent evolution of clamp-like binding sites in diverse chaperones. Nat. Struct. Mol. Biol. 13, 865-870. 2006. Review. View Abstract

Stirling PC, Cuellar J, Alfaro GA, El Khadali F, Beh CT, Valpuesta JM, Melki R and Leroux MR. PhLP3 modulates CCT-mediated actin and tubulin folding via ternary complexes with substrates. J. Biol. Chem. 281, 7012-7021, 2006. View Abstract

Lundin VF*, Stirling PC*, Gomez-Reino J, Mwenifumbo JC, Obst JM, Valpuesta JM and Leroux MR. Molecular clamp mechanism of substrate binding by hydrophobic coiled coil residues in the archaeal chaperone prefoldin. Proc. Natl. Acad. Sci. USA 101, 4367-4372, 2004. *Authors contributed equally. *Faculty of 1000 rated. View Abstract

Stirling PC*, Lundin VF* and Leroux MR. Getting a grip on non-native proteins. EMBO Reports 4, 565-570, 2003. *Authors contributed equally. Review. View Abstract

Dr Emily Chang

Postdoctoral Fellow

Dr Veena Mathew

Postdoctoral Fellow

Karissa Milbury

Graduate Student

Romulo Segovia

Graduate Student

Tianna Sihota

Annie Sui-On Tam

Graduate Student

Amy Yu

Research Projects Manager

Michael Yuen

Graduate Student

Carolina Arias Novoa, MSc Graduate Student, 2014-2017.

Liane Gagnier, Cancer Research Technologist, 2014 -2017.

Claire Fowler, UBC Co-op Student, 2016.

Anni Zhang, UBC Co-op Student,  2015.

Christelle Keong, Summer student 2015,  Part-time researcher, 2016.

Gunjan Kumar, Research Student 2014.  Current position, Graduate student at Vancouver Prostate Centre.