Hunting for the wavefront: investigation of somite boundary positioning in zebrafish

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A CTCF-dependent mechanism underlies the Hox timer relation to a segmented body plan

Denis Duboule, Hocine Rekaik

During gastrulation, Hox genes are activated in a timesequence that follows the order of the genes along their clusters. This property, which is observed in all animals that develop following a progressive rostral-to-caudal morphogenesis, is associated wit ...

Current Biology Ltd2024

How are cells instructed to form somite boundaries by the zebrafish segmentation clock?

Olivier François Venzin

In vertebrate embryos, the elongating body axis is patterned via the sequential and rhyth-mic production of segments from a posterior unsegmented tissue called the presomitic mesoderm (PSM). This process is controlled by a population of cellular oscillator ...

EPFL2023

Reaction wavefront theory of notochord segment patterning

Andrew Charles Oates

The vertebrate axis is segmented into repetitive structures, the vertebrae. In fish, these segmented structures are thought to form from the paraxial mesoderm and the adjacent notochord. Recent work revealed an autonomous patterning mechanism in the zebraf ...

FRONTIERS MEDIA SA2022

Preparation of Single-Somite Explants from Zebrafish Embryos

Andrew Charles Oates, Sundar Ram Naganathan

The body axis of vertebrate embryos is periodically subdivided into 3D multicellular units called somites. While genetic oscillations and molecular prepatterns determine the initial length-scale of somites, mechanical processes have been implicated in sett ...

JOURNAL OF VISUALIZED EXPERIMENTS2022

Patterning and mechanics of somite boundaries in zebrafish embryos

Andrew Charles Oates, Sundar Ram Naganathan

The body axis of vertebrates is subdivided into repetitive compartments called somites, which give rise primarily to the segmented architecture of the musculoskeletal system in the adult body. Somites form in a sequential and rhythmic manner in embryos and ...

2020

What are you synching about? Emerging complexity of Notch signaling in the segmentation clock

Andrew Charles Oates, Olivier François Venzin

The Segmentation clock is a population of cellular genetic oscillators, located in the posterior of the elongating vertebrate embryo, that governs the rhythmic and sequential segmentation of the body axis into somites. Somites are blocks of cells that give ...

ACADEMIC PRESS INC ELSEVIER SCIENCE2020

Waiting on the Fringe: cell autonomy and signaling delays in segmentation clocks

Andrew Charles Oates

The rhythmic and sequential segmentation of the vertebrate body axis into somites during embryogenesis is governed by a multicellular, oscillatory patterning system called the segmentation clock. Despite many overt similarities between vertebrates, differe ...

2020

In vitro modeling of early mouse development

Mehmet Ugur Girgin

Previous attempts to recapitulate embryogenesis in a developmentally relevant context started with aggregates composed of a few thousand ESCs, termed embryoid bodies (EB), that upon induction of differentiation reveal a surprising level of autonomous cell ...

EPFL2020

Embryonic timing, axial stem cells, chromatin dynamics, and the Hox clock

Denis Duboule

Collinear regulation of Hox genes in space and time has been an outstanding question ever since the initial work of Ed Lewis in 1978. Here we discuss recent advances in our understanding of this phenomenon in relation to novel concepts associated with larg ...

2017

Integration of Shh and Fgf signaling in controlling Hox gene expression in cultured limb cells

Denis Duboule, Guillaume Andrey, Patrick Schorderet, Nayuta Yakushiji

During embryonic development, fields of progenitor cells form complex structures through dynamic interactions with external signaling molecules. How complex signaling inputs are integrated to yield appropriate gene expression responses is poorly understood ...

National Academy of Sciences2017

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