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Article
| Open AccessEmx2 underlies the development and evolution of marsupial gliding membranes
Patagia—the mammalian gliding membrane—repeatedly originated through a process of convergent genomic evolution, whereby the regulation of Emx2 was altered by distinct cis-regulatory elements in independently evolved species.
- Jorge A. Moreno
- , Olga Dudchenko
- & Ricardo Mallarino
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Neural crest origin of sympathetic neurons at the dawn of vertebrates
Challenging the belief that sympathetic ganglia are an innovation of jawed vertebrates, a study reports the presence of sympathetic neurons in an extant jawless vertebrate, the sea lamprey Petromyzon marinus.
- Brittany M. Edens
- , Jan Stundl
- & Marianne E. Bronner
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Article
| Open AccessOn the genetic basis of tail-loss evolution in humans and apes
An insertion of an Alu element into an intron of the TBXT gene is identified as a genetic mechanism of tail-loss evolution in humans and apes, with implications for human health today.
- Bo Xia
- , Weimin Zhang
- & Itai Yanai
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Article
| Open AccessCellular development and evolution of the mammalian cerebellum
Single-nucleus RNA-sequencing data from the cerebellum of human, mouse and opossum is used to analyse the developmental dynamics of cell types and states in mammalian cerebellum and provide evolutionary insights.
- Mari Sepp
- , Kevin Leiss
- & Henrik Kaessmann
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Molecular evidence of anteroposterior patterning in adult echinoderms
RNA tomography and in situ hybridization in echinoderms suggest a new ambulacral-anterior model to relate echinoderm pentaradial symmetry to the ancestral bilateral symmetry.
- L. Formery
- , P. Peluso
- & C. J. Lowe
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A cross-species proteomic map reveals neoteny of human synapse development
A study presents a cross-species proteomic map of synapse development in neocortex and reveals that the human postsynaptic density assembly develops two to three times slower than that in macaques and mice.
- Li Wang
- , Kaifang Pang
- & Arnold R. Kriegstein
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Article
| Open AccessA median fin derived from the lateral plate mesoderm and the origin of paired fins
We identify that the larval zebrafish unpaired pre-anal fin fold is derived from the lateral plate mesoderm, can be readily duplicated, and thus may represent a developmental intermediate between median and paired fins.
- Keh-Weei Tzung
- , Robert L. Lalonde
- & Tom J. Carney
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Article
| Open AccessThe little skate genome and the evolutionary emergence of wing-like fins
Skate-specific changes in the epigenome and its three-dimensional organization contributed to the evolution of the batoid fin morphology.
- Ferdinand Marlétaz
- , Elisa de la Calle-Mustienes
- & José Luis Gómez-Skarmeta
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Exceptional fossil preservation and evolution of the ray-finned fish brain
A well-preserved 319-million-year-old brain of the extinct vertebrate Coccocephalus wildi provides insights into neural anatomy deep within the phylogeny of ray-finned fish.
- Rodrigo T. Figueroa
- , Danielle Goodvin
- & Sam Giles
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Article
| Open AccessAnnelid functional genomics reveal the origins of bilaterian life cycles
Comparative chromosome-scale genome sequencing and transcriptomic and epigenomic profiling of three different species of annelid provide insight into the evolutionary origin of larvae.
- Francisco M. Martín-Zamora
- , Yan Liang
- & José M. Martín-Durán
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Article
| Open AccessA transcriptional switch controls sex determination in Plasmodium falciparum
A non-genetic mechanism of sex determination in the human malaria parasite, Plasmodium falciparum, is described, and the male development 1 gene is identified as a potential target for interventions that block malaria transmission.
- A. R. Gomes
- , A. Marin-Menendez
- & A. M. Talman
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Galeaspid anatomy and the origin of vertebrate paired appendages
Articulated remains of Tujiaaspis vividus reveal that galeaspids—extinct jawless vertebrates—had precursors to paired pectoral fins that consisted of paired, continuous pectoral–pelvic lateral fins that passively generated lift.
- Zhikun Gai
- , Qiang Li
- & Min Zhu
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The origin of placental mammal life histories
Using palaeohistology and geochemistry, the placental-like life history of a pantodont species 62 million years of age is determined.
- Gregory F. Funston
- , Paige E. dePolo
- & Stephen L. Brusatte
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The developing bird pelvis passes through ancestral dinosaurian conditions
The developing pelvis in birds revisits its dinosaurian state before transitioning to the characteristic avian form, providing evidence of terminal addition during evolution.
- Christopher T. Griffin
- , João F. Botelho
- & Bhart-Anjan S. Bhullar
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Morphology of Palaeospondylus shows affinity to tetrapod ancestors
Detailed structural analysis of Palaeospondylus gunni from the Middle Devonian period shows strong resemblance to Eusthenopteron and Panderichthys, indicating that it was a sarcopterygian and most probably a stem-tetrapod.
- Tatsuya Hirasawa
- , Yuzhi Hu
- & Shigeru Kuratani
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Hmx gene conservation identifies the origin of vertebrate cranial ganglia
In the tunicate Ciona intestinalis, the homeobox transcription factor Hmx drives differentiation of bipolar tail neurons, indicating conserved regulation and function, and homology with cranial sensory ganglia in higher vertebrates.
- Vasileios Papadogiannis
- , Alessandro Pennati
- & Sebastian M. Shimeld
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Article
| Open AccessPterosaur melanosomes support signalling functions for early feathers
Melanosomes preserved in the skin and feathers of a tapejarid pterosaur from the Early Cretaceous found in Brazil provide evidence of the early use of feathers for visual communication.
- Aude Cincotta
- , Michaël Nicolaï
- & Pascal Godefroit
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Cardiopharyngeal deconstruction and ancestral tunicate sessility
The heart of appendicularians has evolved by 'deconstructing' an ancestral ascidian-like gene regulatory network.
- Alfonso Ferrández-Roldán
- , Marc Fabregà-Torrus
- & Cristian Cañestro
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A monotreme-like auditory apparatus in a Middle Jurassic haramiyidan
A fossil of the Middle Jurassic haramiyidan Vilevolodon diplomylos with a well-preserved malleus, incus and ectotympanic sheds light on the evolutionary transition from a dual to a single function for the ossicles in mammals.
- Junyou Wang
- , John R. Wible
- & Shundong Bi
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An SHR–SCR module specifies legume cortical cell fate to enable nodulation
Repurposing of an SHR–SCR stem cell program in the legume root cortex enables rhizobial symbiosis.
- Wentao Dong
- , Yayun Zhu
- & Ertao Wang
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Dense and pleiotropic regulatory information in a developmental enhancer
A robotic pipeline is used to survey a library of mutations in a Drosphila gene enhancer, showing that most mutations altered gene expression and had widespread pleiotropic effects that are likely to constrain regulatory evolution.
- Timothy Fuqua
- , Jeff Jordan
- & Justin Crocker
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Evolution of the endothelin pathway drove neural crest cell diversification
CRISPR–Cas9-mediated disruption of the endothelin-signalling pathway in the sea lamprey Petromyzon marinus and the frog Xenopus laevis were used to delineate ancient and lineage-specific roles of endothelin signalling and provide insights into vertebrate evolution.
- Tyler A. Square
- , David Jandzik
- & Daniel M. Medeiros
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Origin and elaboration of a major evolutionary transition in individuality
Obligate endosymbiosis between the bacteria Blochmannia and ants of the Camponotini tribe originated through co-option of pre-existing molecular capacities and rewiring of developmental gene regulatory networks.
- Ab. Matteen Rafiqi
- , Arjuna Rajakumar
- & Ehab Abouheif
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A single-cell transcriptome atlas of marsupial embryogenesis and X inactivation
Single-cell RNA-sequencing analysis of embryogenesis and X chromosome inactivation in the opossum (Monodelphis domestica) resolves the developmental trajectory of a marsupial, and sheds light on the evolution of embryogenesis in mammals.
- Shantha K. Mahadevaiah
- , Mahesh N. Sangrithi
- & James M. A. Turner
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Evolution of the new head by gradual acquisition of neural crest regulatory circuits
Analysis of gene expression in the neural crest of vertebrate embryos supports the idea that gene regulatory circuits that define the cranial neural crest evolved gradually from a more trunk-like identity.
- Megan L. Martik
- , Shashank Gandhi
- & Marianne E. Bronner
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Organoid single-cell genomic atlas uncovers human-specific features of brain development
Species comparisons using single-cell transcriptomics and accessible chromatin profiling in stem cell-derived cerebral organoids are used to map dynamic gene-regulatory changes that are unique to humans.
- Sabina Kanton
- , Michael James Boyle
- & J. Gray Camp
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Comprehensive single-cell transcriptome lineages of a proto-vertebrate
Comprehensive single-cell transcriptomes in the proto-vertebrate Ciona intestinalis identified provisional gene networks for 41 different neural subtypes, providing insights into the swimming circuit of tadpoles and the evolution of the vertebrate telencephalon.
- Chen Cao
- , Laurence A. Lemaire
- & Kai Chen
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Insect egg size and shape evolve with ecology but not developmental rate
Analyses of insect eggs as well as genetic and life-history traits of insects show that where eggs are laid, rather than universal allometric constants, developmental rate or adult body size, underlies size and shape evolution.
- Samuel H. Church
- , Seth Donoughe
- & Cassandra G. Extavour
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Developmental dynamics of lncRNAs across mammalian organs and species
A transcriptome dataset from seven organs and seven mammalian species throughout development is used to analyse the expression of long noncoding RNAs in tissues within and between species, and at different stages of organ development.
- Ioannis Sarropoulos
- , Ray Marin
- & Henrik Kaessmann
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Gene expression across mammalian organ development
The transcriptomes of seven major organs across developmental stages from several mammalian species are used for comparative analyses of gene expression and evolution across organ development.
- Margarida Cardoso-Moreira
- , Jean Halbert
- & Henrik Kaessmann
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Letter |
Pluripotency and the origin of animal multicellularity
Comparison of transcriptomes, cell fates and behaviour of three primary cell types from the sponge Amphimedon queenslandica with choanoflagellates and other unicellular holozoans suggests that the first animal cells transitioned between multiple states.
- Shunsuke Sogabe
- , William L. Hatleberg
- & Bernard M. Degnan
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Letter |
Inner ear development in cyclostomes and evolution of the vertebrate semicircular canals
The differentiation of the inner ear in the lamprey Lethenteron camtschaticum and hagfish Eptatretus burgeri sheds light on the evolution of the semicircular canals of jawed vertebrates.
- Shinnosuke Higuchi
- , Fumiaki Sugahara
- & Shigeru Kuratani
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Letter |
Social regulation of a rudimentary organ generates complex worker-caste systems in ants
In the ant genus Pheidole the growth of rudimentary wing discs—which influence developmental allometry to produce castes with distinct morphologies—is socially regulated to determine the worker-to-soldier ratio in Pheidole colonies.
- Rajendhran Rajakumar
- , Sophie Koch
- & Ehab Abouheif
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Letter |
Jurassic stem-mammal perinates and the origin of mammalian reproduction and growth
A well-preserved clutch of Kayentatherium wellesi perinates sheds light on the timing of the evolution of mammalian traits, including reduced clutch sizes and the allometric lengthening of the face during ontogeny.
- Eva A. Hoffman
- & Timothy B. Rowe
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Letter |
Stepwise and independent origins of roots among land plants
Meristems of the rooting axes of Asteroxylon mackiei preserved in 407-million-year-old Rhynie chert lack root caps, which demonstrates that the evolution of the root systems of modern vascular plants occurred in a stepwise fashion.
- Alexander J. Hetherington
- & Liam Dolan
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Letter |
Shared evolutionary origin of vertebrate neural crest and cranial placodes
Similarities between the patterning of the lateral plate in Ciona and of the neural plate ectoderm in vertebrates indicate that compartmentalization of the lateral plate ectoderm preceded the advent of vertebrates.
- Ryoko Horie
- , Alex Hazbun
- & Takeo Horie
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Letter |
Protection from UV light is an evolutionarily conserved feature of the haematopoietic niche
Melanocytes above the haematopoietic niche protect haematopoietic stem cells from ultraviolet-light-induced DNA damage in aquatic vertebrates throughout evolution; this niche moved to the bone marrow during the transition to terrestrial life.
- Friedrich G. Kapp
- , Julie R. Perlin
- & Leonard I. Zon
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Article
| Open AccessThe axolotl genome and the evolution of key tissue formation regulators
Sequencing and assembly of the 32-Gb genome of the Mexican axolotl reveals that it lacks the developmental gene Pax3, which is essential in other vertebrates; the genome sequence could improve our understanding of the evolution of the axolotl’s remarkable regenerative capabilities.
- Sergej Nowoshilow
- , Siegfried Schloissnig
- & Eugene W. Myers
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Article |
Convergent evolution of bilaterian nerve cords
In bilaterian animals, the final configurations of central nervous systems seem unrelated to neuroectodermal patterning systems, so it is likely that the various architectures of the ventral nerve cords evolved convergently, many times.
- José M. Martín-Durán
- , Kevin Pang
- & Andreas Hejnol
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Letter |
GLUTAMATE RECEPTOR-LIKE channels are essential for chemotaxis and reproduction in mosses
Mutations in genes that encode GLUTAMTATE RECEPTOR-LIKE (GLR) channels in the moss Physcomitrella patens result in failure of motile sperm to target the female reproductive organs and of zygotes to develop properly.
- Carlos Ortiz-Ramírez
- , Erwan Michard
- & José A. Feijó
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Letter |
Pre-oral gut contributes to facial structures in non-teleost fishes
In contrast to the prevailing belief that the gut begins with the mouth and continues backwards from there, this work shows that substantial areas of the faces of ray-finned fishes originate from the pre-oral gut or endoderm.
- Martin Minarik
- , Jan Stundl
- & Robert Cerny
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Burgess Shale fossils illustrate the origin of the mandibulate body plan
Tokummia katalepsis from the Burgess Shale had a pair of mandibles and maxilliped claws, showing that large bivalved arthropods from the Cambrian period are forerunners of myriapods and pancrustaceans, thereby providing a basis for the origin of the hyperdiverse mandibulate body plan.
- Cédric Aria
- & Jean-Bernard Caron
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Ancient evolutionary origin of vertebrate enteric neurons from trunk-derived neural crest
Whereas the enteric nervous system of jawed vertebrates is derived largely from the vagal neural crest, that of the sea lamprey (Petromyzon marinus) is populated by trunk-derived neural crest cells that may be homologous to Schwann cell precursors.
- Stephen A. Green
- , Benjamin R. Uy
- & Marianne E. Bronner
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Letter |
Meiofaunal deuterostomes from the basal Cambrian of Shaanxi (China)
Saccorhytus coronarius are millimetric fossils from the early Cambrian period in China that are proposed to represent the most basal known deuterostomes.
- Jian Han
- , Simon Conway Morris
- & Hai Huang
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Article
| Open AccessThe seahorse genome and the evolution of its specialized morphology
Here, the genome sequence of the tiger tail seahorse is reported and comparative genomic analyses with other ray-finned fishes are used to explore the genetic basis of the unique morphology and reproductive system of the seahorse.
- Qiang Lin
- , Shaohua Fan
- & Byrappa Venkatesh
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Developmental mechanisms of stripe patterns in rodents
Alx3-induced modulation of Mitf expression alters melanocyte differentiation and gives rise to the hair colour differences underlying the repeated evolution of dorsal stripes in rodents.
- Ricardo Mallarino
- , Corneliu Henegar
- & Hopi E. Hoekstra
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The stem osteichthyan Andreolepis and the origin of tooth replacement
The extinct Andreolepis, an early fish that is close to the common ancestor of all bony fish and land vertebrates, shed its teeth by basal resportion—the earliest example of this mode of tooth replacement.
- Donglei Chen
- , Henning Blom
- & Per E. Ahlberg
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Letter |
Evolution of Hoxa11 regulation in vertebrates is linked to the pentadactyl state
The mutually exclusive expression of the Hoxa11 and Hoxa13 genes is required for pentadactyl (five-digit) limbs and is proposed to have contributed to the transition from several digits polydactyl (several-digit) limbs in the earliest tetrapods.
- Yacine Kherdjemil
- , Robert L. Lalonde
- & Marie Kmita
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Digits and fin rays share common developmental histories
Hoxa- and Hoxd-deficient zebrafish generated using Crispr/Cas with fate mapping have reduced fin rays and increased endochondral elements, establishing homology between the developmental programs that create fin rays and the wrists and digits of mammals.
- Tetsuya Nakamura
- , Andrew R. Gehrke
- & Neil H. Shubin