---
OA_place: publisher
_id: '14641'
abstract:
- lang: eng
  text: "Mutation rates represent the net result of complex interactions among various\r\ncellular
    processes and can dramatically influence the evolutionary fate of\r\nmicrobial
    populations. However, many popular techniques used to study\r\nmutations are subject
    to the confounding effects of heredity and the subtleties\r\nof adaptation to
    selection, all of which make it difficult to observe any dynamic\r\nresponses
    of mutation rates to fitness challenges. Furthermore, in spite of the\r\nubiquity
    of quorum sensing systems across the bacterial domain and relevance\r\nfor many
    physiological behaviors, the effects of such mechanisms on mutation\r\nrate and
    adaptation remain poorly understood. In the following work, I\r\npresent the development
    of a microfluidic droplet-based method to measure\r\nsingle base-pair mutation
    rates in growing populations of the bacterium\r\nEscherichia coli. I use this
    method to observe a stress-induced increase in\r\nmutation rate that is mediated
    by luxS, a highly conserved bacterial quorum\r\nsensing component. I also show
    that the aforementioned increase in mutation\r\nrate, and its associated control
    by luxS, corresponds to a higher degree of\r\nadaptability under competitive environments."
acknowledged_ssus:
- _id: LifeSc
- _id: Bio
- _id: CampIT
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Mike
  full_name: Hennessey-Wesen, Mike
  id: 3F338C72-F248-11E8-B48F-1D18A9856A87
  last_name: Hennessey-Wesen
citation:
  ama: Hennessey-Wesen M. Adaptive mutation in E. coli modulated by luxS. 2023. doi:<a
    href="https://doi.org/10.15479/at:ista:14641">10.15479/at:ista:14641</a>
  apa: Hennessey-Wesen, M. (2023). <i>Adaptive mutation in E. coli modulated by luxS</i>.
    Institute of Science and Technology Austria. <a href="https://doi.org/10.15479/at:ista:14641">https://doi.org/10.15479/at:ista:14641</a>
  chicago: Hennessey-Wesen, Mike. “Adaptive Mutation in E. Coli Modulated by LuxS.”
    Institute of Science and Technology Austria, 2023. <a href="https://doi.org/10.15479/at:ista:14641">https://doi.org/10.15479/at:ista:14641</a>.
  ieee: M. Hennessey-Wesen, “Adaptive mutation in E. coli modulated by luxS,” Institute
    of Science and Technology Austria, 2023.
  ista: Hennessey-Wesen M. 2023. Adaptive mutation in E. coli modulated by luxS. Institute
    of Science and Technology Austria.
  mla: Hennessey-Wesen, Mike. <i>Adaptive Mutation in E. Coli Modulated by LuxS</i>.
    Institute of Science and Technology Austria, 2023, doi:<a href="https://doi.org/10.15479/at:ista:14641">10.15479/at:ista:14641</a>.
  short: M. Hennessey-Wesen, Adaptive Mutation in E. Coli Modulated by LuxS, Institute
    of Science and Technology Austria, 2023.
corr_author: '1'
date_created: 2023-12-04T13:17:37Z
date_published: 2023-11-30T00:00:00Z
date_updated: 2026-04-07T13:29:59Z
day: '30'
ddc:
- '570'
degree_awarded: PhD
department:
- _id: GradSch
- _id: BjHo
doi: 10.15479/at:ista:14641
ec_funded: 1
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  file_name: 2023_Hennessey_Michael_Thesis_print.pdf
  file_size: 45847968
  relation: other
  title: Print version
file_date_updated: 2025-07-17T11:20:25Z
has_accepted_license: '1'
keyword:
- microfluidics
- miceobiology
- mutations
- quorum sensing
language:
- iso: eng
month: '11'
oa_version: Published Version
page: '104'
project:
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '665385'
  name: International IST Doctoral Program
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
status: public
supervisor:
- first_name: Björn
  full_name: Hof, Björn
  id: 3A374330-F248-11E8-B48F-1D18A9856A87
  last_name: Hof
  orcid: 0000-0003-2057-2754
title: Adaptive mutation in E. coli modulated by luxS
type: dissertation
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
year: '2023'
...
---
_id: '7383'
abstract:
- lang: eng
  text: Organisms cope with change by employing transcriptional regulators. However,
    when faced with rare environments, the evolution of transcriptional regulators
    and their promoters may be too slow. We ask whether the intrinsic instability
    of gene duplication and amplification provides a generic alternative to canonical
    gene regulation. By real-time monitoring of gene copy number mutations in E. coli,
    we show that gene duplications and amplifications enable adaptation to fluctuating
    environments by rapidly generating copy number, and hence expression level, polymorphism.
    This ‘amplification-mediated gene expression tuning’ occurs on timescales similar
    to canonical gene regulation and can deal with rapid environmental changes. Mathematical
    modeling shows that amplifications also tune gene expression in stochastic environments
    where transcription factor-based schemes are hard to evolve or maintain. The fleeting
    nature of gene amplifications gives rise to a generic population-level mechanism
    that relies on genetic heterogeneity to rapidly tune expression of any gene, without
    leaving any genomic signature.
article_processing_charge: No
author:
- first_name: Rok
  full_name: Grah, Rok
  id: 483E70DE-F248-11E8-B48F-1D18A9856A87
  last_name: Grah
  orcid: 0000-0003-2539-3560
citation:
  ama: 'Grah R. Matlab scripts for the Paper: Gene Amplification as a Form of Population-Level
    Gene Expression regulation. 2020. doi:<a href="https://doi.org/10.15479/AT:ISTA:7383">10.15479/AT:ISTA:7383</a>'
  apa: 'Grah, R. (2020). Matlab scripts for the Paper: Gene Amplification as a Form
    of Population-Level Gene Expression regulation. Institute of Science and Technology
    Austria. <a href="https://doi.org/10.15479/AT:ISTA:7383">https://doi.org/10.15479/AT:ISTA:7383</a>'
  chicago: 'Grah, Rok. “Matlab Scripts for the Paper: Gene Amplification as a Form
    of Population-Level Gene Expression Regulation.” Institute of Science and Technology
    Austria, 2020. <a href="https://doi.org/10.15479/AT:ISTA:7383">https://doi.org/10.15479/AT:ISTA:7383</a>.'
  ieee: 'R. Grah, “Matlab scripts for the Paper: Gene Amplification as a Form of Population-Level
    Gene Expression regulation.” Institute of Science and Technology Austria, 2020.'
  ista: 'Grah R. 2020. Matlab scripts for the Paper: Gene Amplification as a Form
    of Population-Level Gene Expression regulation, Institute of Science and Technology
    Austria, <a href="https://doi.org/10.15479/AT:ISTA:7383">10.15479/AT:ISTA:7383</a>.'
  mla: 'Grah, Rok. <i>Matlab Scripts for the Paper: Gene Amplification as a Form of
    Population-Level Gene Expression Regulation</i>. Institute of Science and Technology
    Austria, 2020, doi:<a href="https://doi.org/10.15479/AT:ISTA:7383">10.15479/AT:ISTA:7383</a>.'
  short: R. Grah, (2020).
contributor:
- contributor_type: project_leader
  first_name: Calin C
  id: 47F8433E-F248-11E8-B48F-1D18A9856A87
  last_name: Guet
  orcid: 0000-0001-6220-2052
corr_author: '1'
date_created: 2020-01-28T10:41:49Z
date_published: 2020-01-28T00:00:00Z
date_updated: 2025-06-12T07:34:12Z
day: '28'
department:
- _id: CaGu
- _id: GaTk
doi: 10.15479/AT:ISTA:7383
file:
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  date_updated: 2020-07-14T12:47:57Z
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  file_name: Scripts.zip
  file_size: 73363365
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  date_created: 2020-01-28T10:39:30Z
  date_updated: 2020-07-14T12:47:57Z
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  file_name: READ_ME_MAIN.txt
  file_size: 962
  relation: main_file
file_date_updated: 2020-07-14T12:47:57Z
has_accepted_license: '1'
keyword:
- Matlab scripts
- analysis of microfluidics
- mathematical model
month: '01'
oa: 1
oa_version: Published Version
publisher: Institute of Science and Technology Austria
related_material:
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  - id: '7652'
    relation: used_in_publication
    status: public
status: public
title: 'Matlab scripts for the Paper: Gene Amplification as a Form of Population-Level
  Gene Expression regulation'
type: research_data
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '7016'
abstract:
- lang: eng
  text: Organisms cope with change by employing transcriptional regulators. However,
    when faced with rare environments, the evolution of transcriptional regulators
    and their promoters may be too slow. We ask whether the intrinsic instability
    of gene duplication and amplification provides a generic alternative to canonical
    gene regulation. By real-time monitoring of gene copy number mutations in E. coli,
    we show that gene duplications and amplifications enable adaptation to fluctuating
    environments by rapidly generating copy number, and hence expression level, polymorphism.
    This ‘amplification-mediated gene expression tuning’ occurs on timescales similar
    to canonical gene regulation and can deal with rapid environmental changes. Mathematical
    modeling shows that amplifications also tune gene expression in stochastic environments
    where transcription factor-based schemes are hard to evolve or maintain. The fleeting
    nature of gene amplifications gives rise to a generic population-level mechanism
    that relies on genetic heterogeneity to rapidly tune expression of any gene, without
    leaving any genomic signature.
article_processing_charge: No
author:
- first_name: Isabella
  full_name: Tomanek, Isabella
  id: 3981F020-F248-11E8-B48F-1D18A9856A87
  last_name: Tomanek
  orcid: 0000-0001-6197-363X
citation:
  ama: Tomanek I. Data for the paper “Gene amplification as a form of population-level
    gene expression regulation.” 2019. doi:<a href="https://doi.org/10.15479/AT:ISTA:7016">10.15479/AT:ISTA:7016</a>
  apa: Tomanek, I. (2019). Data for the paper “Gene amplification as a form of population-level
    gene expression regulation.” Institute of Science and Technology Austria. <a href="https://doi.org/10.15479/AT:ISTA:7016">https://doi.org/10.15479/AT:ISTA:7016</a>
  chicago: Tomanek, Isabella. “Data for the Paper ‘Gene Amplification as a Form of
    Population-Level Gene Expression Regulation.’” Institute of Science and Technology
    Austria, 2019. <a href="https://doi.org/10.15479/AT:ISTA:7016">https://doi.org/10.15479/AT:ISTA:7016</a>.
  ieee: I. Tomanek, “Data for the paper ‘Gene amplification as a form of population-level
    gene expression regulation.’” Institute of Science and Technology Austria, 2019.
  ista: Tomanek I. 2019. Data for the paper ‘Gene amplification as a form of population-level
    gene expression regulation’, Institute of Science and Technology Austria, <a href="https://doi.org/10.15479/AT:ISTA:7016">10.15479/AT:ISTA:7016</a>.
  mla: Tomanek, Isabella. <i>Data for the Paper “Gene Amplification as a Form of Population-Level
    Gene Expression Regulation.”</i> Institute of Science and Technology Austria,
    2019, doi:<a href="https://doi.org/10.15479/AT:ISTA:7016">10.15479/AT:ISTA:7016</a>.
  short: I. Tomanek, (2019).
contributor:
- contributor_type: project_leader
  first_name: Calin C
  id: 47F8433E-F248-11E8-B48F-1D18A9856A87
  last_name: Guet
  orcid: 0000-0001-6220-2052
date_created: 2019-11-13T09:07:31Z
date_published: 2019-11-13T00:00:00Z
date_updated: 2025-06-12T07:34:12Z
day: '13'
ddc:
- '576'
department:
- _id: CaGu
doi: 10.15479/AT:ISTA:7016
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  date_updated: 2020-07-14T12:47:47Z
  description: Illumina whole genome sequence data for Locus 1 - amplified.
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  description: Illumina whole genome sequence data for Locus 1 - ancestral.
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  description: Illumina whole genome sequence data for Locus 1 - amplified, after
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    reporter gene cassette.
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  date_updated: 2020-07-14T12:47:47Z
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  file_size: 8141727
  relation: main_file
  title: microfluidics data
file_date_updated: 2020-07-14T12:47:47Z
has_accepted_license: '1'
keyword:
- Escherichia coli
- gene amplification
- galactose
- DOG
- experimental evolution
- Illumina sequence data
- FACS data
- microfluidics data
month: '11'
oa: 1
oa_version: Published Version
publisher: Institute of Science and Technology Austria
related_material:
  record:
  - id: '7652'
    relation: used_in_publication
    status: public
status: public
title: Data for the paper "Gene amplification as a form of population-level gene expression
  regulation"
type: research_data
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2019'
...
---
OA_place: publisher
_id: '6891'
abstract:
- lang: eng
  text: "While cells of mesenchymal or epithelial origin perform their effector functions
    in a purely anchorage dependent manner, cells derived from the hematopoietic lineage
    are not committed to operate only within a specific niche. Instead, these cells
    are able to function autonomously of the molecular composition in a broad range
    of tissue compartments. By this means, cells of the hematopoietic lineage retain
    the capacity to disseminate into connective tissue and recirculate between organs,
    building the foundation for essential processes such as tissue regeneration or
    immune surveillance. \r\nCells of the immune system, specifically leukocytes,
    are extraordinarily good at performing this task. These cells are able to flexibly
    shift their mode of migration between an adhesion-mediated and an adhesion-independent
    manner, instantaneously accommodating for any changes in molecular composition
    of the external scaffold. The key component driving directed leukocyte migration
    is the chemokine receptor 7, which guides the cell along gradients of chemokine
    ligand. Therefore, the physical destination of migrating leukocytes is purely
    deterministic, i.e. given by global directional cues such as chemokine gradients.
    \r\nNevertheless, these cells typically reside in three-dimensional scaffolds
    of inhomogeneous complexity, raising the question whether cells are able to locally
    discriminate between multiple optional migration routes. Current literature provides
    evidence that leukocytes, specifically dendritic cells, do indeed probe their
    surrounding by virtue of multiple explorative protrusions. However, it remains
    enigmatic how these cells decide which one is the more favorable route to follow
    and what are the key players involved in performing this task. Due to the heterogeneous
    environment of most tissues, and the vast adaptability of migrating leukocytes,
    at this time it is not clear to what extent leukocytes are able to optimize their
    migratory strategy by adapting their level of adhesiveness. And, given the fact
    that leukocyte migration is characterized by branched cell shapes in combination
    with high migration velocities, it is reasonable to assume that these cells require
    fine tuned shape maintenance mechanisms that tightly coordinate protrusion and
    adhesion dynamics in a spatiotemporal manner. \r\nTherefore, this study aimed
    to elucidate how rapidly migrating leukocytes opt for an ideal migratory path
    while maintaining a continuous cell shape and balancing adhesive forces to efficiently
    navigate through complex microenvironments. \r\nThe results of this study unraveled
    a role for the microtubule cytoskeleton in promoting the decision making process
    during path finding and for the first time point towards a microtubule-mediated
    function in cell shape maintenance of highly ramified cells such as dendritic
    cells. Furthermore, we found that migrating low-adhesive leukocytes are able to
    instantaneously adapt to increased tensile load by engaging adhesion receptors.
    This response was only occurring tangential to the substrate while adhesive properties
    in the vertical direction were not increased. As leukocytes are primed for rapid
    migration velocities, these results demonstrate that leukocyte integrins are able
    to confer a high level of traction forces parallel to the cell membrane along
    the direction of migration without wasting energy in gluing the cell to the substrate.
    \r\nThus, the data in the here presented thesis provide new insights into the
    pivotal role of cytoskeletal dynamics and the mechanisms of force transduction
    during leukocyte migration. \r\nThereby the here presented results help to further
    define fundamental principles underlying leukocyte migration and open up potential
    therapeutic avenues of clinical relevance.\r\n"
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Aglaja
  full_name: Kopf, Aglaja
  id: 31DAC7B6-F248-11E8-B48F-1D18A9856A87
  last_name: Kopf
  orcid: 0000-0002-2187-6656
citation:
  ama: Kopf A. The implication of cytoskeletal dynamics on leukocyte migration. 2019.
    doi:<a href="https://doi.org/10.15479/AT:ISTA:6891">10.15479/AT:ISTA:6891</a>
  apa: Kopf, A. (2019). <i>The implication of cytoskeletal dynamics on leukocyte migration</i>.
    Institute of Science and Technology Austria. <a href="https://doi.org/10.15479/AT:ISTA:6891">https://doi.org/10.15479/AT:ISTA:6891</a>
  chicago: Kopf, Aglaja. “The Implication of Cytoskeletal Dynamics on Leukocyte Migration.”
    Institute of Science and Technology Austria, 2019. <a href="https://doi.org/10.15479/AT:ISTA:6891">https://doi.org/10.15479/AT:ISTA:6891</a>.
  ieee: A. Kopf, “The implication of cytoskeletal dynamics on leukocyte migration,”
    Institute of Science and Technology Austria, 2019.
  ista: Kopf A. 2019. The implication of cytoskeletal dynamics on leukocyte migration.
    Institute of Science and Technology Austria.
  mla: Kopf, Aglaja. <i>The Implication of Cytoskeletal Dynamics on Leukocyte Migration</i>.
    Institute of Science and Technology Austria, 2019, doi:<a href="https://doi.org/10.15479/AT:ISTA:6891">10.15479/AT:ISTA:6891</a>.
  short: A. Kopf, The Implication of Cytoskeletal Dynamics on Leukocyte Migration,
    Institute of Science and Technology Austria, 2019.
corr_author: '1'
date_created: 2019-09-19T08:19:44Z
date_published: 2019-07-24T00:00:00Z
date_updated: 2026-04-08T07:11:03Z
day: '24'
ddc:
- '570'
degree_awarded: PhD
department:
- _id: MiSi
doi: 10.15479/AT:ISTA:6891
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title: The implication of cytoskeletal dynamics on leukocyte migration
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---
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abstract:
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  text: "Nela Nikolic, Tobias Bergmiller, Alexandra Vandervelde, Tanino G. Albanese,
    Lendert Gelens, and Isabella Moll (2018)\r\n“Autoregulation of mazEF expression
    underlies growth heterogeneity in bacterial populations” Nucleic Acids Research,
    doi: 10.15479/AT:ISTA:74;\r\nmicroscopy experiments by Tobias Bergmiller; image
    and data analysis by Nela Nikolic."
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  id: 2C471CFA-F248-11E8-B48F-1D18A9856A87
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  orcid: 0000-0001-5396-4346
- first_name: Nela
  full_name: Nikolic, Nela
  id: 42D9CABC-F248-11E8-B48F-1D18A9856A87
  last_name: Nikolic
  orcid: 0000-0001-9068-6090
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  ama: Bergmiller T, Nikolic N. Time-lapse microscopy data. 2018. doi:<a href="https://doi.org/10.15479/AT:ISTA:74">10.15479/AT:ISTA:74</a>
  apa: Bergmiller, T., &#38; Nikolic, N. (2018). Time-lapse microscopy data. Institute
    of Science and Technology Austria. <a href="https://doi.org/10.15479/AT:ISTA:74">https://doi.org/10.15479/AT:ISTA:74</a>
  chicago: Bergmiller, Tobias, and Nela Nikolic. “Time-Lapse Microscopy Data.” Institute
    of Science and Technology Austria, 2018. <a href="https://doi.org/10.15479/AT:ISTA:74">https://doi.org/10.15479/AT:ISTA:74</a>.
  ieee: T. Bergmiller and N. Nikolic, “Time-lapse microscopy data.” Institute of Science
    and Technology Austria, 2018.
  ista: Bergmiller T, Nikolic N. 2018. Time-lapse microscopy data, Institute of Science
    and Technology Austria, <a href="https://doi.org/10.15479/AT:ISTA:74">10.15479/AT:ISTA:74</a>.
  mla: Bergmiller, Tobias, and Nela Nikolic. <i>Time-Lapse Microscopy Data</i>. Institute
    of Science and Technology Austria, 2018, doi:<a href="https://doi.org/10.15479/AT:ISTA:74">10.15479/AT:ISTA:74</a>.
  short: T. Bergmiller, N. Nikolic, (2018).
datarep_id: '74'
date_created: 2018-12-12T12:31:35Z
date_published: 2018-02-07T00:00:00Z
date_updated: 2026-04-16T12:20:36Z
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ddc:
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department:
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doi: 10.15479/AT:ISTA:74
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month: '02'
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publisher: Institute of Science and Technology Austria
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title: Time-lapse microscopy data
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