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Single-molecule imaging of transcription dynamics

Bibliographic Details
Main Author: Silva, Alda Filipa Queirós Oliveira e
Publication Date: 2019
Format: Master thesis
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/10451/40631
Summary: Tese de mestrado, Biologia Molecular e Genética, Universidade de Lisboa, Faculdade de Ciências, 2019
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spelling Single-molecule imaging of transcription dynamicsR-loopsTerminação da transcriçãoSplicingMicroscopia confocal de células vivas com sensibilidade de para detetar moléculas individuaisCinética da RNA polimerase IIModelo do torpedoTeses de mestrado - 2019Departamento de Biologia VegetalTese de mestrado, Biologia Molecular e Genética, Universidade de Lisboa, Faculdade de Ciências, 2019Transcription is the molecular process that synthesizes an RNA molecule that is complementary to the DNA template. In eukaryotes, transcription is catalyzed by one of three RNA polymerases that share structural features and subunits but transcribe different types of genes. RNA polymerase II (RNA Pol II) transcribes genes that code for proteins and several long non-coding genes. RNA Pol II transcription involves three main stages: initiation; transition into productive elongation; and termination. This thesis focuses on transcription termination and aims at studying its functional links with RNA processing and the formation of non-canonical nucleic acids structures, such as R-loops. R-loops are by-products of transcription that also have been found to play a role in transcription regulation, however, it is not well understood how they affect transcription termination and mRNA processing. To decipher how R-loop formation affect the process of transcription and RNA processing, we directly examined with single-molecule sensitivity the synthesis of transcripts upstream and downstream the cleavage and polyadenylation site (CPAS) in the nucleus of living human cells and calculated the transcription rate of RNA Pol II for that regions. By using two different RNA labeling methods, PP7 and λN22, we show that R-loops suppression impairs transcription termination. Further, we show that R-loop formation after the CPAS is not essential for an immediate transcription termination. A model for transcription termination, the torpedo model, suggests that exoribonuclease 2 (XRN2) digests the unprotected 5’ end of the RNA transcript until it collides with the RNA Pol II, leading to its dissociation from the template DNA and favoring transcription termination. Here, we provide evidence for the torpedo model by observing a non-immediate termination when XRN2 is depleted. Moreover, we show that splicing inhibition impairs transcript cleavage and transcription termination. Our data provide new insights in the role of R-loops in transcription termination and mRNA processing.Martin, Robert ManfredCarvalho, Margarida Henriques da Gama, 1972-Repositório da Universidade de LisboaSilva, Alda Filipa Queirós Oliveira e2021-10-30T00:30:25Z201920192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/40631TID:202380823enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T14:14:02Zoai:repositorio.ulisboa.pt:10451/40631Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T03:06:07.714612Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Single-molecule imaging of transcription dynamics
title Single-molecule imaging of transcription dynamics
spellingShingle Single-molecule imaging of transcription dynamics
Silva, Alda Filipa Queirós Oliveira e
R-loops
Terminação da transcrição
Splicing
Microscopia confocal de células vivas com sensibilidade de para detetar moléculas individuais
Cinética da RNA polimerase II
Modelo do torpedo
Teses de mestrado - 2019
Departamento de Biologia Vegetal
title_short Single-molecule imaging of transcription dynamics
title_full Single-molecule imaging of transcription dynamics
title_fullStr Single-molecule imaging of transcription dynamics
title_full_unstemmed Single-molecule imaging of transcription dynamics
title_sort Single-molecule imaging of transcription dynamics
author Silva, Alda Filipa Queirós Oliveira e
author_facet Silva, Alda Filipa Queirós Oliveira e
author_role author
dc.contributor.none.fl_str_mv Martin, Robert Manfred
Carvalho, Margarida Henriques da Gama, 1972-
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Silva, Alda Filipa Queirós Oliveira e
dc.subject.por.fl_str_mv R-loops
Terminação da transcrição
Splicing
Microscopia confocal de células vivas com sensibilidade de para detetar moléculas individuais
Cinética da RNA polimerase II
Modelo do torpedo
Teses de mestrado - 2019
Departamento de Biologia Vegetal
topic R-loops
Terminação da transcrição
Splicing
Microscopia confocal de células vivas com sensibilidade de para detetar moléculas individuais
Cinética da RNA polimerase II
Modelo do torpedo
Teses de mestrado - 2019
Departamento de Biologia Vegetal
description Tese de mestrado, Biologia Molecular e Genética, Universidade de Lisboa, Faculdade de Ciências, 2019
publishDate 2019
dc.date.none.fl_str_mv 2019
2019
2019-01-01T00:00:00Z
2021-10-30T00:30:25Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/40631
TID:202380823
url http://hdl.handle.net/10451/40631
identifier_str_mv TID:202380823
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
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repository.mail.fl_str_mv info@rcaap.pt
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