Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient
- Autores
- Sigaut, Lorena; Pearson, John E.; Colman Lerner, Alejandro Ariel; Ponce Dawson, Silvina Martha
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The gradient of Bicoid (Bcd) is key for the establishment of the anterior-posterior axis in Drosophila embryos. The gradient properties are compatible with the SDD model in which Bcd is synthesized at the anterior pole and then diffuses into the embryo and is degraded with a characteristic time. Within this model, the Bcd diffusion coefficient is critical to set the timescale of gradient formation. This coefficient has been measured using two optical techniques, Fluorescence Recovery After Photobleaching (FRAP) and Fluorescence Correlation Spectroscopy (FCS), obtaining estimates in which the FCS value is an order of magnitude larger than the FRAP one. This discrepancy raises the following questions: which estimate is ?correct?; what is the reason for the disparity; and can the SDD model explain Bcd gradient formation within the experimentally observed times. In this paper, we use a simple biophysical model in which Bcd diffuses and interacts with binding sites to show that both the FRAP and the FCS estimates may be correct and compatible with the observed timescale of gradient formation. The discrepancy arises from the fact that FCS and FRAP report on different effective (concentration dependent) diffusion coefficients, one of which describes the spreading rate of the individual Bcd molecules (the messengers) and the other one that of their concentration (the message). The latter is the one that is more relevant for the gradient establishment and is compatible with its formation within the experimentally observed times.
Fil: Sigaut, Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
Fil: Pearson, John E.. Los Alamos National Laboratory;
Fil: Colman Lerner, Alejandro Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Fisiología, Biología Molecular y Neurociencias. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisiología, Biología Molecular y Neurociencias; Argentina
Fil: Ponce Dawson, Silvina Martha. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina - Materia
-
development
quantitative microscopy
diffusion
bicoid - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/18030
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Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficientSigaut, LorenaPearson, John E.Colman Lerner, Alejandro ArielPonce Dawson, Silvina Marthadevelopmentquantitative microscopydiffusionbicoidhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The gradient of Bicoid (Bcd) is key for the establishment of the anterior-posterior axis in Drosophila embryos. The gradient properties are compatible with the SDD model in which Bcd is synthesized at the anterior pole and then diffuses into the embryo and is degraded with a characteristic time. Within this model, the Bcd diffusion coefficient is critical to set the timescale of gradient formation. This coefficient has been measured using two optical techniques, Fluorescence Recovery After Photobleaching (FRAP) and Fluorescence Correlation Spectroscopy (FCS), obtaining estimates in which the FCS value is an order of magnitude larger than the FRAP one. This discrepancy raises the following questions: which estimate is ?correct?; what is the reason for the disparity; and can the SDD model explain Bcd gradient formation within the experimentally observed times. In this paper, we use a simple biophysical model in which Bcd diffuses and interacts with binding sites to show that both the FRAP and the FCS estimates may be correct and compatible with the observed timescale of gradient formation. The discrepancy arises from the fact that FCS and FRAP report on different effective (concentration dependent) diffusion coefficients, one of which describes the spreading rate of the individual Bcd molecules (the messengers) and the other one that of their concentration (the message). The latter is the one that is more relevant for the gradient establishment and is compatible with its formation within the experimentally observed times.Fil: Sigaut, Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; ArgentinaFil: Pearson, John E.. Los Alamos National Laboratory;Fil: Colman Lerner, Alejandro Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Fisiología, Biología Molecular y Neurociencias. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisiología, Biología Molecular y Neurociencias; ArgentinaFil: Ponce Dawson, Silvina Martha. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; ArgentinaPublic Library Of Science2014-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/18030Sigaut, Lorena; Pearson, John E.; Colman Lerner, Alejandro Ariel; Ponce Dawson, Silvina Martha; Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient; Public Library Of Science; Plos Computational Biology; 10; 6; 4-2014; 1-15; e10036291553-734Xenginfo:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1003629info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pcbi.1003629info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:05:46Zoai:ri.conicet.gov.ar:11336/18030instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:05:46.887CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient |
title |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient |
spellingShingle |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient Sigaut, Lorena development quantitative microscopy diffusion bicoid |
title_short |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient |
title_full |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient |
title_fullStr |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient |
title_full_unstemmed |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient |
title_sort |
Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient |
dc.creator.none.fl_str_mv |
Sigaut, Lorena Pearson, John E. Colman Lerner, Alejandro Ariel Ponce Dawson, Silvina Martha |
author |
Sigaut, Lorena |
author_facet |
Sigaut, Lorena Pearson, John E. Colman Lerner, Alejandro Ariel Ponce Dawson, Silvina Martha |
author_role |
author |
author2 |
Pearson, John E. Colman Lerner, Alejandro Ariel Ponce Dawson, Silvina Martha |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
development quantitative microscopy diffusion bicoid |
topic |
development quantitative microscopy diffusion bicoid |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The gradient of Bicoid (Bcd) is key for the establishment of the anterior-posterior axis in Drosophila embryos. The gradient properties are compatible with the SDD model in which Bcd is synthesized at the anterior pole and then diffuses into the embryo and is degraded with a characteristic time. Within this model, the Bcd diffusion coefficient is critical to set the timescale of gradient formation. This coefficient has been measured using two optical techniques, Fluorescence Recovery After Photobleaching (FRAP) and Fluorescence Correlation Spectroscopy (FCS), obtaining estimates in which the FCS value is an order of magnitude larger than the FRAP one. This discrepancy raises the following questions: which estimate is ?correct?; what is the reason for the disparity; and can the SDD model explain Bcd gradient formation within the experimentally observed times. In this paper, we use a simple biophysical model in which Bcd diffuses and interacts with binding sites to show that both the FRAP and the FCS estimates may be correct and compatible with the observed timescale of gradient formation. The discrepancy arises from the fact that FCS and FRAP report on different effective (concentration dependent) diffusion coefficients, one of which describes the spreading rate of the individual Bcd molecules (the messengers) and the other one that of their concentration (the message). The latter is the one that is more relevant for the gradient establishment and is compatible with its formation within the experimentally observed times. Fil: Sigaut, Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina Fil: Pearson, John E.. Los Alamos National Laboratory; Fil: Colman Lerner, Alejandro Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Fisiología, Biología Molecular y Neurociencias. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisiología, Biología Molecular y Neurociencias; Argentina Fil: Ponce Dawson, Silvina Martha. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina |
description |
The gradient of Bicoid (Bcd) is key for the establishment of the anterior-posterior axis in Drosophila embryos. The gradient properties are compatible with the SDD model in which Bcd is synthesized at the anterior pole and then diffuses into the embryo and is degraded with a characteristic time. Within this model, the Bcd diffusion coefficient is critical to set the timescale of gradient formation. This coefficient has been measured using two optical techniques, Fluorescence Recovery After Photobleaching (FRAP) and Fluorescence Correlation Spectroscopy (FCS), obtaining estimates in which the FCS value is an order of magnitude larger than the FRAP one. This discrepancy raises the following questions: which estimate is ?correct?; what is the reason for the disparity; and can the SDD model explain Bcd gradient formation within the experimentally observed times. In this paper, we use a simple biophysical model in which Bcd diffuses and interacts with binding sites to show that both the FRAP and the FCS estimates may be correct and compatible with the observed timescale of gradient formation. The discrepancy arises from the fact that FCS and FRAP report on different effective (concentration dependent) diffusion coefficients, one of which describes the spreading rate of the individual Bcd molecules (the messengers) and the other one that of their concentration (the message). The latter is the one that is more relevant for the gradient establishment and is compatible with its formation within the experimentally observed times. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/18030 Sigaut, Lorena; Pearson, John E.; Colman Lerner, Alejandro Ariel; Ponce Dawson, Silvina Martha; Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient; Public Library Of Science; Plos Computational Biology; 10; 6; 4-2014; 1-15; e1003629 1553-734X |
url |
http://hdl.handle.net/11336/18030 |
identifier_str_mv |
Sigaut, Lorena; Pearson, John E.; Colman Lerner, Alejandro Ariel; Ponce Dawson, Silvina Martha; Messages Do Diffuse Faster Than Messengers: Reconciling disparate estimates of the morphogen Bicoid diffusion coefficient; Public Library Of Science; Plos Computational Biology; 10; 6; 4-2014; 1-15; e1003629 1553-734X |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1003629 info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pcbi.1003629 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Public Library Of Science |
publisher.none.fl_str_mv |
Public Library Of Science |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1842269928072151040 |
score |
13.13397 |