Cited by 298Subterranean biodiversity and taxonomyRetinal Development and DisordersDevelopmental Biology and Gene Regulation

Regressive Evolution in Astyanax Cavefish

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Jeffery, William R.·2009·Annual Review of Genetics

Abstract

A diverse group of animals, including members of most major phyla, have adapted to life in the perpetual darkness of caves. These animals are united by the convergence of two regressive phenotypes, loss of eyes and pigmentation. The mechanisms of regressive evolution are poorly understood. The teleost Astyanax mexicanus is of special significance in studies of regressive evolution in cave animals. This species includes an ancestral surface dwelling form and many con-specific cave-dwelling forms, some of which have evolved their recessive phenotypes independently. Recent advances in Astyanax development and genetics have provided new information about how eyes and pigment are lost during cavefish evolution; namely, they have revealed some of the molecular and cellular mechanisms involved in trait modification, the number and identity of the underlying genes and mutations, the molecular basis of parallel evolution, and the evolutionary forces driving adaptation to the cave environment.

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Crossref · 10.1146/annurev-genet-102108-134216

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  • Excess Shh causes expression of vax1 and pax2a, which interfere with pax6 expression and the downstream pax6 ocular patterning subcircuit.

    “excess Shh causes expression of transcription repressors (vax1 and pax2a) which interfere with pax6 expression and thus the downstream pax6 ocular patterning subcircuit (Jeffery, 2009; Yamamoto et al., 2004) (Baumer et al., 2002).”

    From Evolution of Gene Regulatory Networks Controlling Body Plan Development (2011) · cites this paper as Jeffery, 2009

    In “Candidate Gene Analysis” (page unavailable), the review reports that increased Shh downregulates pax6 and that cavefish embryos show both reduced pax6 and overexpressed pax2a and vax1. It describes antagonism among these transcription factors, but does not establish that excess Shh causes pax2a and vax1 expression or describe a downstream pax6 ocular-patterning subcircuit. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Ectopic spatial expression of shh from the medial interocular region across the ocular fields in cave fish is a cause of eye degeneration.

    “A cause is ectopic spatial expression of shh from the normal medial interocular region across the top of the ocular fields in cave fish.”

    From Evolution of Gene Regulatory Networks Controlling Body Plan Development (2011) · cites this paper as Jeffery, 2009

  • Excess Shh indirectly promotes apoptosis in lens and retina.

    “Also, excess Shh indirectly promotes apoptosis in lens and retina.”

    From Evolution of Gene Regulatory Networks Controlling Body Plan Development (2011) · cites this paper as Jeffery, 2009

  • In cavefish eye development, apoptotic degeneration of lens and retina occurs.

    “But then many things go wrong in eye development including apoptotic degeneration of lens and retina.”

    From Evolution of Gene Regulatory Networks Controlling Body Plan Development (2011) · cites this paper as Jeffery, 2009

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Research works printed but not linked: 1

  1. [9]Culver DC Wilkens H 2000 Critical review of the relevant theories of the evolution of subterranean animals Ecosystems of the World 30 Wilkens H Culver DC Humphreys WF 381 98 Amsterdam Elsevier

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Authors
Jeffery, W. R.
Affiliations
University of Maryland, College Park (US)
Corresponding author
Jeffery, William R.
Venue
Annual Review of Genetics
Published
2009-12-01
Volume
43
Issue
1
Pages
25-47
ISSN
  • 0066-4197 (ISSN-L)
  • 1545-2948
OpenAlex
W2121610939
Cited by
298
References
68
Citations by year
2026: 15 · 2025: 21 · 2024: 15 · 2023: 20 · 2022: 20 · 2021: 18 · 2020: 28 · 2019: 16 · 2018: 28 · 2017: 14 · 2016: 13 · 2015: 14 · 2014: 16 · 2013: 25 · 2012: 13
FWCI
1.21
Type
journal article
Language
en
Open access
Locations
  • Annual Review of Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Commons - University of South Florida (University of South Florida) (submittedVersion)
Funders
  • National Science Foundation
  • Fordham University
  • National Institutes of Health
  • U.S. Public Health Service (EYO14619)
  • National Eye Institute (R01EY014619)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Subterranean biodiversity and taxonomy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
regressive evolution, Astyanax mexicanus, cavefish, eye loss, pigmentation loss, cave adaptation, parallel evolution, developmental genetics
MeSH terms
Animals, Darkness, Biological Evolution, Eye, Fishes, Skin Pigmentation

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