Cavefish and the basis for eye loss

Krishnan, Jaya; Rohner, Nicolas

doi:10.1098/rstb.2015.0487

Cited by 107 publications

(89 citation statements)

References 74 publications

(102 reference statements)

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“…The next section focuses on diversification and modifications of morphology as exemplified by tetrapod limbs by Saxena et al [54], flowers by Pam Soltis and co-workers [55], cranial shape in birds by Abzhanov and co-workers [45] and wing coloration patterns in butterflies by Jiggins et al [56]. The last section considers the relatively recent evolution of genetically determined morphological variation within a single species owing to either natural selection, using as examples, cavefish (article by Krishnan & Rohner [57]) and stickleback (article by Piechel & Marques [58]) or artificial selection, using dogs as an example (article by Elaine Ostrander and co-workers [59]) and ends with the article on developmental plasticity by Xu & Zhang [49].…”

Section: The Organization Of This Theme Issuementioning

confidence: 99%

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Perspectives on the history of evo-devo and the contemporary research landscape in the genomics era

Tickle

Urrutia

2017

Phil. Trans. R. Soc. B

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A fundamental question in biology is how the extraordinary range of living organisms arose. In this theme issue, we celebrate how evolutionary studies on the origins of morphological diversity have changed over the past 350 years since the first publication of the Philosophical Transactions of The Royal Society . Current understanding of this topic is enriched by many disciplines, including anatomy, palaeontology, developmental biology, genetics and genomics. Development is central because it is the means by which genetic information of an organism is translated into morphology. The discovery of the genetic basis of development has revealed how changes in form can be inherited, leading to the emergence of the field known as evolutionary developmental biology (evo-devo). Recent approaches include imaging, quantitative morphometrics and, in particular, genomics, which brings a new dimension. Articles in this issue illustrate the contemporary evo-devo field by considering general principles emerging from genomics and how this and other approaches are applied to specific questions about the evolution of major transitions and innovations in morphology, diversification and modification of structures, intraspecific morphological variation and developmental plasticity. Current approaches enable a much broader range of organisms to be studied, thus building a better appreciation of the origins of morphological diversity. This article is part of the themed issue ‘Evo-devo in the genomics era, and the origins of morphological diversity’.

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Section: The Organization Of This Theme Issuementioning

confidence: 99%

“…An important advance has been the establishment of model systems that can be thought of as exemplifying 'evolution in action'. The two examples discussed in this issue are the natural populations of cavefish [57] and stickleback [58] with diverse morphologies that live in different environments.…”

Section: The Organization Of This Theme Issuementioning

confidence: 99%

Perspectives on the history of evo-devo and the contemporary research landscape in the genomics era

Tickle

Urrutia

2017

Phil. Trans. R. Soc. B

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“…The Mexican tetra Astyanax mexicanus is a versatile model system, which is well suited for the study of the evolution of morphology, behavior, and physiology . The different ecologies of the river and cave habitats of this species have led to the evolution of river dwelling and cave adapted populations which differ in a large number of traits (Figure A,B).…”

Section: Introductionmentioning

confidence: 99%

Stable transgenesis in Astyanax mexicanus using the Tol2 transposase system

Stahl

Peuß

McDole

et al. 2019

Developmental Dynamics

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Background Astyanax mexicanus is a well‐established fish model system for evolutionary and developmental biology research. These fish exist as surface forms that inhabit rivers and 30 different populations of cavefish. Despite important progress in the deployment of new technologies, deep mechanistic insights into the genetic basis of evolution, development, and behavior have been limited by a lack of transgenic lines commonly used in genetic model systems. Results Here, we expand the toolkit of transgenesis by characterizing two novel stable transgenic lines that were generated using the highly efficient Tol2 system, commonly used to generate transgenic zebrafish. A stable transgenic line consisting of the zebrafish ubiquitin promoter expresses enhanced green fluorescent protein ubiquitously throughout development in a surface population of Astyanax. To define specific cell‐types, a Cntnap2‐mCherry construct labels lateral line mechanosensory neurons in zebrafish. Strikingly, both constructs appear to label the predicted cell types, suggesting many genetic tools and defined promoter regions in zebrafish are directly transferrable to cavefish. Conclusion The lines provide proof‐of‐principle for the application of Tol2 transgenic technology in A. mexicanus. Expansion on these initial transgenic lines will provide a platform to address broadly important problems in the quest to bridge the genotype‐phenotype gap.

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“…Interestingly, however, many widespread patterns continue to be contentious or even mysterious. For example, many recent debates focus on the mechanism responsible for regressive evolution such as the reduction and loss of eyes (Culver and Wilkens 2000, Christiansen 2012, Klaus et al 2013, Krishnan and Rohner 2016). An old but still unsettled question concerns the apparent higher diversity of troglomorphic animals in temperate rather than in tropical regions (Howarth 1980, Culver and Sket 2000, Deharveng and Bedos 2012.…”

Section: Introductionmentioning

confidence: 99%

Cave-dwelling pholcid spiders (Araneae, Pholcidae): a review

Huber¹

2018

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Pholcidae are ubiquitous spiders in tropical and subtropical caves around the globe, yet very little is known about cave-dwelling pholcids beyond what is provided in taxonomic descriptions and faunistic papers. This paper provides a review based on a literature survey and unpublished information, while pointing out potential biases and promising future projects. A total of 473 native (i.e. non-introduced) species of Pholcidae have been collected in about 1000 caves. The large majority of cave-dwelling pholcids are not troglomorphic; a list of 86 troglomorphic species is provided, including 21 eyeless species and 21 species with strongly reduced eyes. Most troglomorphic pholcids are representatives of only two genera: Anopsicus Chamberlin & Ivie, 1938 and Metagonia Simon, 1893. Mexico is by far the richest country in terms of troglomorphic pholcids, followed by several islands and mainland SE Asia. The apparent dominance of Mexico may partly be due to collectors' and taxonomists' biases. Most caves harbor only one pholcid species, but 91 caves harbor two and more species (up to five species). Most troglomorphic pholcids belong to two subfamilies (Modisiminae, Pholcinae), very few belong to Smeringopinae and Arteminae, none to Ninetinae. This is in agreement with the recent finding that within Pholcidae, microhabitat changes in general are concentrated in Modisiminae and Pholcinae.

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Cavefish and the basis for eye loss

Cited by 107 publications

References 74 publications

Perspectives on the history of evo-devo and the contemporary research landscape in the genomics era

Perspectives on the history of evo-devo and the contemporary research landscape in the genomics era

Stable transgenesis in Astyanax mexicanus using the Tol2 transposase system

Cave-dwelling pholcid spiders (Araneae, Pholcidae): a review

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