Research group Group Engström

We study transcriptional and non-transcriptional functions of insect and human POU/Oct transcription factors in development, cell division and cancer. One project focuses on non-transcriptional roles of POU2F factors during mitosis. Another project focuses on alternative protein translation of a POU3F member and the mechanisms of tissue-specific regulation of Stop Codon Readthrough (SCR). We use the fruit fly Drosophila as a powerful genetic model organism taking advantage of its extensive genetic toolbox, in combination with high-throughput expression analyses, high resolution microscopy and live-cell imaging.


Our research aims to achieve a comprehensive understanding of the evolutionarily conserved POU/Oct family of transcription factors and their roles in development, physiology, cell division, cancer, and immunity. With the unique possibilities for genetic manipulation, Drosophila is an important model to study the mechanisms regulating proliferation, differentiation, regenerative growth and cancer.

A central focus is to understand how distinct POU/Oct protein isoforms are generated through the use of alternative promoters, alternative splicing, and alternative translation, and how these protein isoforms regulate specific downstream target genes in a tissue- and developmental stage-specific manner.

Our work spans less studied processes at multiple levels of the central dogma of molecular biology, from chromosome segregation during cell division to translational regulation through stop codon readthrough (SCR). These studies have provided important insights that challenge established textbook concepts, while opening new avenues for therapeutic strategies to treat genetic disorders and cancer.

Taking advantage of Drosophila as a genetic model organism as well as cultured cells from human and fly, we use a broad palette of genetic and molecular tools including CRISPR/Cas9-mediated gene editing, RNA-interference, transgene- and reporter gene expression. In addition to this broad use of molecular biology methodology, our research includes RNAomic and proteomic approaches, as well as high-resolution microscopy and live-cell imaging.

This research group has no members.

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The mRNA architecture of the translation termination site primes programmed stop codon readthrough events in Drosophila. Kansara L, Wolfstetter G, Wintermayr D, Alexopoulos I, Escos A, Friedländer M, Engström Y. RNA Biol. 2026 Dec 31;23(1):1-21. doi: 10.1080/15476286.2026.2667707. Epub 2026 May 12. PMID: 42089732 Free PMC article.

A non-transcriptional mitotic function of POU/Oct factors ensures spindle assembly and chromosome segregation. Gohel P, Tsarouhas V, Kansara L, Sajwan S, Engström Y. J Cell Sci. 2026 Mar 1;139(5):jcs264165. doi: 10.1242/jcs.264165. Epub 2026 Mar 17. PMID: 41725553 Free PMC article.

A U3 snoRNA is required for the regulation of chromatin dynamics and antiviral response in Drosophila melanogaster. Jain S, Planells J, Regadas I, Barrett D, von Euler A, Sinha I, Lindberg BG, Hesson JC, Swacha P, Gekara NO, Pelechano V, Engström Y, Mannervik M, Visa N. Nucleic Acids Res. 2025 Jul 19;53(14):gkaf715. doi: 10.1093/nar/gkaf715. PMID: 40737091 Free PMC article.

A surfactant lipid layer of endosomal membranes facilitates airway gas filling in Drosophila. Tsarouhas V, Liu D, Tsikala G, Engström Y, Strigini M, Samakovlis C. Curr Biol. 2023 Dec 4;33(23):5132-5146.e5. doi: 10.1016/j.cub.2023.10.058. Epub 2023 Nov 21. PMID: 37992718 Free article.

Exposure to Therapeutic BTK Inhibitors Induces Phenocopying of Btk29A Mutants in the Fruit Fly Drosophila melanogaster. Hamada-Kawaguchi N, Nore BF, Zain R, Engström Y, Smith CIE, Yamamoto D. Front Biosci (Landmark Ed). 2023 Jun 27;28(6):124. doi: 10.31083/j.fbl2806124. PMID: 37395037 Free article.

Identification of a GABAergic neuroblast lineage modulating sweet and bitter taste sensitivity. Zhao Y, Duan J, Han Z, Engström Y, Hartenstein V. Curr Biol. 2022 Dec 19;32(24):5354-5363.e3. doi: 10.1016/j.cub.2022.10.029. Epub 2022 Nov 7. PMID: 36347251 Free PMC article.

Stop codon readthrough alters the activity of a POU/Oct transcription factor during Drosophila - development. Zhao Y, Lindberg BG, Esfahani SS, Tang X, Piazza S, Engström Y. BMC Biol. 2021 Sep 3;19(1):185. doi: 10.1186/s12915-021-01106-0. PMID: 34479564

Bab2 Functions as an Ecdysone-Responsive Transcriptional Repressor during Drosophila Development. - Duan J, Zhao Y, Li H, Habernig L, Gordon MD, Miao X, Engström Y, Büttner S. Cell Rep. 2020 Jul 28;32(4):107972. doi: 10.1016/j.celrep.2020.107972. PMID: 32726635

The POU/Oct Transcription Factor Nubbin Controls the Balance of Intestinal Stem Cell Maintenance and - Differentiation by Isoform-Specific Regulation. Tang X, Zhao Y, Buchon N, Engström Y. Stem Cell Reports. 2018 May 8;10(5):1565-1578. doi: 10.1016/j.stemcr.2018.03.014. Epub 2018 Apr 19. PMID: 29681543 .

Nubbin isoform antagonism governs Drosophila intestinal immune homeostasis. - Lindberg BG, Tang X, Dantoft W, Gohel P, Seyedoleslami Esfahani S, Lindvall JM, Engström Y. PLoS Pathog. 2018 Mar 2;14(3):e1006936. doi: 10.1371/journal.ppat.1006936. eCollection 2018 Mar. PMID: 29499056

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New publication: Kansara et al., 2026

KEY POINTS

  • Stop codon readthrough is regulated both by mRNA sequence identity and mRNA structure elements.
  • A 3’ mRNA stem-loop and its thermodynamic stability determine stop codon readthrough efficiency.
  • Computational analyses identified 3´UTR mRNA stem-loops in previously predicted SCR genes.
Figur 1

New publication: Gohel et al., 2026

Highlights

  • Nub/Pdm1 is vital for accurate mitotic progression in a non-transcriptional manner
  • Nub/Pdm1 ensures spindle integrity during rapid syncytial nuclear divisions
  • Nub/Pdm1 spindle enrichment depends on mitotic factors and intact microtubules
  • Nub and human Oct1 ensure proper chromosome segregation

Congratulations to Dr Laveena Kansara on the successful defence of her PhD thesis on May 7th, 2026. Her thesis work made important contributions to our understanding of programmed stop codon readthrough and translational regulation in Drosophila.

  • Motivated students interested in joining the group for a Master’s project or internship are welcome to contact us at: ylva.engstrom@su.se.
Laveena under disputationen