Publications associées à Tetrapoda

Wide-scale identification of novel/eliminated genes responsible for evolutionary transformations

BackgroundIt is generally accepted that most evolutionary transformations at the phenotype level are associated either with rearrangements of genomic regulatory elements, which control the activity of gene networks, or with changes in the amino acid conten ...

2023

Flexural-tensegrity snapping tails for bio-inspired propulsion in fluids

Pedro Miguel Nunes Pereira de Almeida Reis, Claudio Boni

Many aquatic animals propel themselves by flapping their tails. Leveraging a recently proposed snapping cantilever beam based on the concept of flexural tensegrity, we propose a bio-inspired propulsion device. The design comprises a segmental beam with hol ...

ELSEVIER2022

Reverse-engineering the locomotion of a stem amniote

Auke Ijspeert, Kamilo Andres Melo Becerra, Tomislav Horvat, Konstantinos Karakasiliotis

Reconstructing the locomotion of extinct vertebrates offers insights into their palaeobiology and helps to conceptualize major transitions in vertebrate evolution. However, estimating the locomotor behaviour of a fossil species remains a challenge because ...

2019

Coordinated Hoxd genes expression during embryogenesis is dependent on a strict disposition of genes and polarized regulators within the HoxD cluster

Fabrice Daniel Darbellay

HOX transcription factors determine the identity of body regions along the rostro-caudal axis during bilaterian embryogenesis. In vertebrates Hox genes distinctively lie organized in dense clusters, each typically composed of a dozen paralogous transcripti ...

EPFL2018

Control of Bio-Inspired Sprawling Posture Quadruped Robots with an Actuated Spine

Tomislav Horvat

Sprawling posture robots are characterized by upper limb segments protruding horizontally from the body, resulting in lower body height and wider support on the ground. Combined with an actuated segmented spine and tail, such morphology resembles that of s ...

EPFL2018

KRAB zinc-finger proteins contribute to the evolution of gene regulatory networks

Didier Trono, Michaël Imbeault, Pierre-Yves Joseph Laurent Helleboid

The human genome encodes some 350 Kruppel-associated box (KRAB) domain-containing zinc-finger proteins (KZFPs), the products of a rapidly evolving gene family that has been traced back to early tetrapods(1,2). The function of most KZFPs is unknown, but a f ...

Nature Publishing Group2017

A Simple Body-limb Coordination Model that Mimics Primitive Tetrapod Walking

Auke Ijspeert, Shura Suzuki

The coordination of body and limbs motions contributes to effective propulsion in limed locomotion. However, there is lack of understanding that characterizes the mechanism underlying the body-limb coordination. The aim of this study involves clarifying th ...

IEEE2017

Tetrapod axial evolution and developmental constraints; Empirical underpinning by a mouse model

Denis Duboule

The tetrapod vertebral column has become increasingly complex during evolution as an adaptation to a terrestrial life. At the same time, the evolution of the vertebral formula became subject to developmental constraints acting on the size of the cervical a ...

Elsevier2015

The effects on biomechanics of walking and balance recovery in a novel pelvis exoskeleton during zero-torque control

Silvestro Micera

Fall-related accidents are among the most serious concerns in elderly people, amputees and subjects with neurological disorders. The aim of this paper was to investigate the behaviour of healthy subjects wearing a novel light-weight pelvis exoskeleton cont ...

Cambridge University Press2014

The evolution of lncRNA repertoires and expression patterns in tetrapods

Anamaria Necsulea, Magali Soumillon

Only a very small fraction of long noncoding RNAs (lncRNAs) are well characterized. The evolutionary history of lncRNAs can provide insights into their functionality, but the absence of lncRNA annotations in non-model organisms has precluded comparative an ...

Nature Publishing Group2014

Measurements of three-dimensional glenoid erosion when planning the prosthetic replacement of osteoarthritic shoulders

Alexandre Terrier, Alain Farron, Julien Ston, Xabier Larrea

The three-dimensional (3D) correction of glenoid erosion is critical to the long-term success of total shoulder replacement (TSR). In order to characterise the 3D morphology of eroded glenoid surfaces, we looked for a set of morphological parameters useful ...

British Editorial Soc Bone Joint Surgery2014

From lamprey to salamander: an exploratory modeling study on the architecture of the spinal locomotor networks in the salamander

Auke Ijspeert, Andrej Bicanski

The evolutionary transition from water to land required new locomotor modes and corresponding adjustments of the spinal "central pattern generators" for locomotion. Salamanders resemble the first terrestrial tetrapods and represent a key animal for the stu ...

Springer Berlin Heidelberg2013

Regulatory Switches Underlie Hoxd Gene Activation in Tetrapod Limbs

Guillaume Andrey

Accurate spatio-temporal control of Hox cluster genes expression is critical for the proper organization of body structures during vertebrate embryogenesis. In the limbs, Hoxd genes are critical in setting up the proximodistal and anteroposterior axes. Sev ...

EPFL2013

Retinoic acid signaling organizes endodermal organ specification along the entire antero-posterior axis

Anne Grapin-Botton

BACKGROUND: Endoderm organ primordia become specified between gastrulation and gut tube folding in Amniotes. Although the requirement for RA signaling for the development of a few individual endoderm organs has been established a systematic assessment of i ...

Public Library of Science2009

Synthesis and Structure-Property Correlation in Shape-Controlled ZnO Nanoparticles Prepared by Chemical Vapor Synthesis and their Application in Dye-Sensitized Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Peter Chen

Here, the large scale synthesis of nanocrystalline ZnO spheres and tetrapods in the size range of 8-40 nm by chemical vapor synthesis using zinc metal as precursor is described. A detailed study of the effect of experimental parameters on the morphology an ...

2009

Organisation of the spinal central pattern generators for locomotion in the salamander: biology and modelling

Auke Ijspeert

Among living tetrapods, salamanders are regarded as most closely resembling the first terrestrial vertebrates, and are therefore an interesting group in which the evolutionary changes in the locomotor behaviour from aquatic to terrestrial habitats can be i ...

2008

Temperature effects on the spectral properties of colloidal CdSe nanodots, nanorods, and tetrapods

Majed Chergui, Frank van Mourik, Awos Al Salman

The temp. dependence of the absorption and fluorescence spectra of colloidal CdSe nanocrystals was compared for three different shapes (dots, rods, and tetrapods) at 4-300 K. While the shift of the fluorescence max. indicates little dependence on the shape ...

2007

Tinkering with constraints in the evolution of the vertebrate limb anterior-posterior polarity

Denis Duboule, Jozsef Zakany

Genes belonging to both HoxA and HoxD clusters are required for proper vertebrate limb development. Mice lacking all, or parts of, Hoxa and Hoxd functions in forelimbs, as well as mice with a gain of function of these genes in the early limb bud, have help ...

2007