Cited by 234Developmental Biology and Gene RegulationGenomics and Chromatin DynamicsMorphological variations and asymmetry

Regulatory divergence modifies limb length between mammals

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Cretekos, Chris J., Wang, Ying, Green, Eric D., NISC Comparative Sequencing Program, Martin, James F., Rasweiler, John J., Behringer, Richard R.·2008·Genes & Development

Abstract

Natural selection acts on variation within populations, resulting in modified organ morphology, physiology, and ultimately the formation of new species. Although variation in orthologous proteins can contribute to these modifications, differences in DNA sequences regulating gene expression may be a primary source of variation. We replaced a limb-specific transcriptional enhancer of the mouse Prx1 locus with the orthologous sequence from a bat. Prx1 expression directed by the bat enhancer results in elevated transcript levels in developing forelimb bones and forelimbs that are significantly longer than controls because of endochondral bone formation alterations. Surprisingly, deletion of the mouse Prx1 limb enhancer results in normal forelimb length and Prx1 expression, revealing regulatory redundancy. These findings suggest that mutations accumulating in pre-existing noncoding regulatory sequences within a population are a source of variation for the evolution of morphological differences between species and that cis -regulatory redundancy may facilitate accumulation of such mutations.

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Crossref · 10.1101/gad.1620408

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  • Several cases of dramatic morphological changes that occurred very recently are due to alteration in regulation of single genes encoding signaling ligands or transcription factors.

    “There are now several justly famous cases where dramatic morphological changes that have occurred very recently have been shown to be due to alteration in regulation of single genes, encoding either signaling ligands (Abzhanov et al. 2006) or transcription factors (Cretekos et al. 2008; Chan et al. 2009; Rebeiz et al. 2009).”

    From An integrated view of precambrian eumetazoan evolution (2009) · cites this paper as Cretekos et al. 2008

    The Abstract and Results report that replacing a mouse Prx1 enhancer with its bat counterpart increased Prx1 expression and lengthened mouse forelimbs, supporting an effect of altered regulation of a transcription-factor gene. But the Results describe a 6% length increase, and the Discussion calls this a possible slight modification toward bat-wing evolution—not proof that a dramatic, recent natural change was caused by regulation of a single gene. Page numbers are unavailable in our copy. (LLM, conf=0.88)

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  • Inserting the bat prx1 limb enhancer into the mouse gene caused recipient mouse forelimbs to develop with relatively longer dimensions.

    “The (indirect) causality of this change was then demonstrated by inserting the bat prx1 limb enhancer into the mouse gene, with the result that the forelimbs of the recipient mouse now develop with relatively longer dimensions.”

    From Evolution of Gene Regulatory Networks Controlling Body Plan Development (2011) · cites this paper as Cretekos et al., 2008

  • The longer relative forearm skeleton length in bats compared to rodents is associated with up-regulation of prx1 after early limb bud stage.

    “A candidate regulatory gene known to affect limb skeletal elongation is prx1 (mhox), and in bats this gene is up-regulated after the early limb bud stage compared to mice (Cretekos et al., 2008).”

    From Evolution of Gene Regulatory Networks Controlling Body Plan Development (2011) · cites this paper as Cretekos et al., 2008

  • Variation in gene expression mediated by cis-regulatory elements plays an important role in evolutionary phenotypic change.

    “Variation in gene expression mediated by cis-REs plays an important role in evolutionary phenotypic change (32, 42–46).”

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  1. Ausubel, F.M. 1989. Current protocols in molecular biology. John Wiley & Sons, New York.

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Authors
Cretekos, C. J., Wang, Y., Green, E. D., Program, N. C. S., Martin, J. F., Rasweiler, J. J., & Behringer, R. R.
Affiliations
  • The University of Texas MD Anderson Cancer Center (US)
  • National Institutes of Health (US)
  • Texas A&M University (US)
  • Texas A&M Health Science Center (US)
  • SUNY Downstate Health Sciences University (US)
Venue
Genes & Development
Published
2008-01-15
Volume
22
Issue
2
Pages
141-151
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2138279862
Cited by
232
References
54
Citations by year
2026: 7 · 2025: 8 · 2024: 6 · 2023: 8 · 2022: 6 · 2021: 15 · 2020: 19 · 2019: 4 · 2018: 10 · 2017: 11 · 2016: 20 · 2015: 10 · 2014: 22 · 2013: 14 · 2012: 12
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (0220458)
  • National Institutes of Health (CA-16 672, HD07325)
  • National Human Genome Research Institute
  • National Cancer Institute (CA 09299, T32CA009299, P30CA016672)
  • National Institute of Dental and Craniofacial Research (DE16329, R01DE016329)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (T32HD007325, HD 16672)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Physical Sciences › Mathematics › Geometry and Topology › Morphological variations and asymmetry
Keywords
limb length, PRRX1, enhancers, cis-regulatory elements, regulatory divergence, forelimb development, endochondral ossification, mice, morphological evolution
MeSH terms
Animals, Chiroptera, Enhancer Elements, Genetic, Biological Evolution, Forelimb, Gene Expression Regulation, Genes, Homeobox, Mutation, Regulatory Sequences, Nucleic Acid, Transfection, Homeodomain Proteins, Evolution, Molecular, Mice

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