Cis-regulatory element and trans factors controlling Krox20 expression during hindbrain segmentation
type: Dataset
description: During development, the posterior brain undergoes a transient segmentation process along the anteroposterior axis leading to its subdivision into 7 transversal units called rhombomeres (r) that form developmental and genetic expression units. The zinc finger factor plays a key role in this process by coupling the formation and the specification of the rhombomeres 3 and 5. Three regulatory elements controlling Krox20 expression have been characterized previously. Elements B and C are active in r5 and in r3-r5, respectively, and are involved in the onset of Krox20 expression whose amplification and upkeep are carried out by the autoregulatory element A. Thus, element C is a key tool to investigate the mechanisms responsible for the regionalized expression of Krox20 in r3. In order to deepen the characterization of Krox20 transcriptional control in r3, I undertook a functional analysis of the sequences of element C by mutagenesis and identified several conserved blocks required for its activity in r3. Furthermore, I established the complete quantitative and differential transcriptomic map of the mouse early hindbrain by RNA-Seq and I characterized several regulators of element C activity. Finally, I analyzed the mouse mutant where element C is deleted and I revealed new properties of Krox20 transcriptional control, notably a cis-cooperation between elements A and C. As a conclusion, this work shows how the combination of different approaches allows the elucidation of a complex transcriptional regulation mechanism that plays an essential role in cell specification
identifier: NNT: 2012PAO66518
issued: 2026-05-10T18:30:14.582018
language: fr
modified: 2026-05-10T18:30:14.582022
contact point: Organization
  fn: CCSD
keyword: element-regulateur
keyword: facteurs-de-transcription
keyword: infoeu-reposemanticsdoctoralthesis
keyword: regulation-transcriptionnelle
keyword: rhombencephale
keyword: rna-seq
keyword: sdvbddlife-sciences-q-biodevelopment-biology
keyword: segmentation
keyword: theses
landing page: https://theses.hal.science/tel-00832985

Cis-regulatory element and trans factors controlling Krox20 expression during hindbrain segmentation
type: Distribution
format: HTML
issued: 2026-05-10T18:30:14.592431
modified: 2026-05-10T18:30:14.571035
access URL: https://theses.hal.science/tel-00832985

test_moissonnage_selune
type: Agent