The lamprey in evolutionary studies

  title={The lamprey in evolutionary studies},
  author={Joana Os{\'o}rio and Sylvie R{\'e}taux},
  journal={Development Genes and Evolution},
Lampreys are a key species to study the evolution of morphological characters at the dawn of Craniates and throughout the evolution of the craniate’s phylum. Here, we review a number of research fields where studies on lampreys have recently brought significant and fundamental insights on the timing and mechanisms of evolution, on the amazing diversification of morphology and on the emergence of novelties among Craniates. We report recent example studies on neural crest, muscle and the… 

Lampreys, “Living Fossils,” in Research on Early Development and Regeneration in Vertebrates

Recent data on the molecular aspects of the early development of the telencephalon, early embryonic differentiation, and regeneration of lampreys are reviewed.

Neurodevelopment Genes in Lampreys Reveal Trends for Forebrain Evolution in Craniates

Systematic expression patterns comparisons with model organisms highlight conservations likely to reflect shared features present in the vertebrate ancestors and point to changes in signaling systems which may have been crucial in the evolution of forebrain anatomy at the origin of vertebrates.

The sea lamprey Petromyzon marinus: a model for evolutionary and developmental biology.

With the establishment of techniques for the extended maintenance and spawning of lampreys in the laboratory, the sequencing of the lamprey genome, and the adaptation and optimization of many established molecular biology and histochemistry techniques for use in this species, P. marinus is poised to become an evolutionary developmental model of choice.

Introduction: A Surfeit of Lampreys

A broad perspective on the cultural, ecological, and scientific importance of lampreys is provided, some historical trends in lamprey research are outlined, and the ­growing ­interest—among scientists and laypeople—in this previously underappreciated group of fishes is celebrated.

Chromosome‐level genome assembly of Lethenteron reissneri provides insights into lamprey evolution

This study assembled the first chromosome‐level reference genome for Cyclostomata and identified two neural‐related genes, Nrn1 and Unc13a, with copy number expansions in jawed vertebrates, which may be functionally relevant to the origin of lamprey brains.

Development and Organization of the Lamprey Telencephalon with Special Reference to the GABAergic System

This study summarizes the organization of the adult lamprey telencephalon by analyzing the main proposed conceptions, including the available data on the expression pattern of some developmental regulatory genes which are of importance for building its adult shape.

Midline signaling and evolution of the forebrain in chordates: a focus on the lamprey Hedgehog case.

Lampreys are agnathans (vertebrates without jaws). They occupy a key phylogenetic position in the emergence of novelties and in the diversification of morphology at the dawn of vertebrates. We have

Discovery of fossil lamprey larva from the Lower Cretaceous reveals its three-phased life cycle

The discovery of exceptionally preserved premetamorphic and metamorphosing larvae of the fossil lamprey Mesomyzon mengae from the Lower Cretaceous of Inner Mongolia, China are reported, indicating the three-phased life cycle in lampreys emerged essentially in their present mode no later than the Early Cret Jurassic.

Insights into Cyclostome Phylogenomics: Pre-2R or Post-2R

The hypothesis that two-round (2R) genome duplication events occurred before the divergence between cyclostomes and gnathostomes, and therefore that a post-2R state is a genomic synapomorphy for all extant vertebrates is focused on.



Lamprey as an evo‐devo model: Lessons from comparative embryology and molecular phylogenetics

In this review, recent molecular developmental and evolutionary molecular research on the living lampreys are summarized and discussed, taking vertebrate comparative morphology and embryology into consideration.

Developmental studies of the lamprey and hierarchical evolutionary steps towards the acquisition of the jaw

The jaw seems to have arisen as an evolutionary novelty by overriding ancestral constraints, a process in which morphological homologies are partially lost, and the heterotopic evolution may be based on changes in the regulation of signalling‐molecule‐encoding genes.

Lamprey Dlx genes and early vertebrate evolution.

Cloned Dlx genes from the lamprey Petromyzon marinus, an agnathan vertebrate that occupies a critical phylogenetic position between cephalochordates and gnathostomes, are cloned and identified and used as a model for how this gene family evolved in the vertebrate lineage.

Hagfish embryology with reference to the evolution of the neural crest

It is proposed that the neural crest emerged as a population of de-epithelialized migratory cells in a common vertebrate ancestor, and it is suggested that the possibility of classical and molecular embryology in hagfish opens up new approaches to clarifying the evolutionary history of vertebrates.

Otx expression during lamprey embryogenesis provides insights into the evolution of the vertebrate head and jaw.

Cloned and characterized a homolog of the head-specific gene Otx from the lampreys, indicating that the divergence of Otx1 and Otx2 took place after the gnathostome/agnathan divergence and does not correlate with the origin of the vertebrate brain.

Evolutionary biology: Lamprey Hox genes and the evolution of jaws

It is concluded that Cohn's finding of Hox genes in another lamprey species, Lethenteron japonicum, is not a general feature within the lamprey group and is therefore unlikely to be related to jawlessness.

Evolutionary biology: Lamprey Hox genes and the origin of jaws

It is shown that in the lamprey, a primitively jawless (agnathan) fish that is a sister group to the gnathostomes, a Hox gene is expressed in the mandibular arch of developing embryos, which suggests that loss of Hox expression from the mandibia arch of gnathOSTomes may have facilitated the evolution of jaws.

Identification and expression of the lamprey Pax6 gene: evolutionary origin of the segmented brain of vertebrates.

Most of the segmented domains of the vertebrate brain were already established in the ancestor common to all vertebrates, suggesting major evolutionary changes in the vertebrates may have involved local restriction of cell lineages, leading to the establishment of neuromeres.

Amphioxus and lamprey AP-2 genes: implications for neural crest evolution and migration patterns.

Isolation and comparison of amphioxus, lamprey and axolotl AP-2 reveals its extensive expansion in the vertebrate dorsal neural tube and pharyngeal arches, implying co-option ofAP-2 genes by neural crest cells early in vertebrate evolution.

Evolution of the Nervous System in Fishes