Evolutionary Emergence of the // Regulatory Cluster Refined Mechanisms for Hindbrain Boundaries Formation

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2018 Apr 4

PMID 29610331

Citations 10

Authors

Joaquin Letelier

Javier Terriente

Ivan Belzunce

Adria Voltes

Cristian Alberto Undurraga

Rocio Polvillo

Lucie Devos

Juan J Tena

Ignacio Maeso

Sylvie Retaux

Jose Luis Gomez-Skarmeta

Juan R Martinez-Morales

Cristina Pujades

Affiliations

Soon will be listed here.

Abstract

Developmental programs often rely on parallel morphogenetic mechanisms that guarantee precise tissue architecture. While redundancy constitutes an obvious selective advantage, little is known on how novel morphogenetic mechanisms emerge during evolution. In zebrafish, rhombomeric boundaries behave as an elastic barrier, preventing cell intermingling between adjacent compartments. Here, we identify the fundamental role of the small-GTPase Rac3b in actomyosin cable assembly at hindbrain boundaries. We show that the novel // regulatory cluster, which is specifically expressed at the boundaries, emerged in the Ostariophysi superorder by chromosomal rearrangement that generated new -regulatory interactions. By combining 4C-seq, ATAC-seq, transgenesis, and CRISPR-induced deletions, we characterized this regulatory domain, identifying hindbrain boundary-specific -regulatory elements. Our results suggest that the capacity of boundaries to act as an elastic mesh for segregating rhombomeric cells evolved by cooption of critical genes to a novel regulatory block, refining the mechanisms for hindbrain segmentation.

Citing Articles

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