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Title: Subfunctionalization of Duplicated Zebrafish pax6 Genes by cis-Regulatory Divergence

Abstract

Gene duplication is a major driver of evolutionary divergence. In most vertebrates a single PAX6 gene encodes a transcription factor required for eye, brain, olfactory system, and pancreas development. In zebrafish, following a postulated whole-genome duplication event in an ancestral teleost, duplicates pax6a and pax6b jointly fulfill these roles. Mapping of the homozygously viable eye mutant sunrise identified a homeodomain missense change in pax6b, leading to loss of target binding. The mild phenotype emphasizes role-sharing between the co-orthologues. Meticulous mapping of isolated BACs identified perturbed synteny relationships around the duplicates. This highlights the functional conservation of pax6 downstream (39) control sequences, which in most vertebrates reside within the introns of a ubiquitously expressed neighbour gene, ELP4, whose pax6a-linked exons have been lost in zebrafish. Reporter transgenic studies in both mouse and zebrafish, combined with analysis of vertebrate sequence conservation, reveal loss and retention of specific cis-regulatory elements, correlating strongly with the diverged expression of coorthologues, and providing clear evidence for evolution by subfunctionalization.

Authors:
 [1];  [1];  [1];  [2];  [2];  [3];  [1];  [1];  [1];  [1];  [1]
  1. Western General Hospital, Edinburgh, Scotland (United Kingdom). Medical Research Council (MRC) Human Genetics Unit
  2. Max-Planck Inst. for Developmental Biology, Tubingen (Germany). Dept. of Genetics
  3. Univ. of Udine (Italy). Dept. of Science and Biomedical Technology
Publication Date:
Research Org.:
Western General Hospital, Edinburgh, Scotland (United Kingdom). Medical Research Council (MRC) Human Genetics Unit
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
OSTI Identifier:
1627269
Resource Type:
Accepted Manuscript
Journal Name:
PLoS Genetics
Additional Journal Information:
Journal Volume: 4; Journal Issue: 2; Journal ID: ISSN 1553-7404
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Genetics & Heredity

Citation Formats

Kleinjan, Dirk A., Bancewicz, Ruth M., Gautier, Philippe, Dahm, Ralf, Schonthaler, Helia B., Damante, Giuseppe, Seawright, Anne, Hever, Ann M., Yeyati, Patricia L., van Heyningen, Veronica, and Coutinho, Pedro. Subfunctionalization of Duplicated Zebrafish pax6 Genes by cis-Regulatory Divergence. United States: N. p., 2008. Web. doi:10.1371/journal.pgen.0040029.
Kleinjan, Dirk A., Bancewicz, Ruth M., Gautier, Philippe, Dahm, Ralf, Schonthaler, Helia B., Damante, Giuseppe, Seawright, Anne, Hever, Ann M., Yeyati, Patricia L., van Heyningen, Veronica, & Coutinho, Pedro. Subfunctionalization of Duplicated Zebrafish pax6 Genes by cis-Regulatory Divergence. United States. https://doi.org/10.1371/journal.pgen.0040029
Kleinjan, Dirk A., Bancewicz, Ruth M., Gautier, Philippe, Dahm, Ralf, Schonthaler, Helia B., Damante, Giuseppe, Seawright, Anne, Hever, Ann M., Yeyati, Patricia L., van Heyningen, Veronica, and Coutinho, Pedro. Fri . "Subfunctionalization of Duplicated Zebrafish pax6 Genes by cis-Regulatory Divergence". United States. https://doi.org/10.1371/journal.pgen.0040029. https://www.osti.gov/servlets/purl/1627269.
@article{osti_1627269,
title = {Subfunctionalization of Duplicated Zebrafish pax6 Genes by cis-Regulatory Divergence},
author = {Kleinjan, Dirk A. and Bancewicz, Ruth M. and Gautier, Philippe and Dahm, Ralf and Schonthaler, Helia B. and Damante, Giuseppe and Seawright, Anne and Hever, Ann M. and Yeyati, Patricia L. and van Heyningen, Veronica and Coutinho, Pedro},
abstractNote = {Gene duplication is a major driver of evolutionary divergence. In most vertebrates a single PAX6 gene encodes a transcription factor required for eye, brain, olfactory system, and pancreas development. In zebrafish, following a postulated whole-genome duplication event in an ancestral teleost, duplicates pax6a and pax6b jointly fulfill these roles. Mapping of the homozygously viable eye mutant sunrise identified a homeodomain missense change in pax6b, leading to loss of target binding. The mild phenotype emphasizes role-sharing between the co-orthologues. Meticulous mapping of isolated BACs identified perturbed synteny relationships around the duplicates. This highlights the functional conservation of pax6 downstream (39) control sequences, which in most vertebrates reside within the introns of a ubiquitously expressed neighbour gene, ELP4, whose pax6a-linked exons have been lost in zebrafish. Reporter transgenic studies in both mouse and zebrafish, combined with analysis of vertebrate sequence conservation, reveal loss and retention of specific cis-regulatory elements, correlating strongly with the diverged expression of coorthologues, and providing clear evidence for evolution by subfunctionalization.},
doi = {10.1371/journal.pgen.0040029},
journal = {PLoS Genetics},
number = 2,
volume = 4,
place = {United States},
year = {Fri Feb 15 00:00:00 EST 2008},
month = {Fri Feb 15 00:00:00 EST 2008}
}

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Preservation of Duplicate Genes by Complementary, Degenerative Mutations
journal, April 1999


PAX6 in sensory development
journal, May 2002


Novel ENU-induced eye mutations in the mouse: models for human eye disease
journal, April 2002


Genetic dissection of Pax6 dosage requirements in the developing mouse eye
journal, June 2005

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journal, November 1993


Two independent and interactive DNA-binding subdomains of the Pax6 paired domain are regulated by alternative splicing.
journal, September 1994


PipMaker---A Web Server for Aligning Two Genomic DNA Sequences
journal, April 2000


The zebrafish gene map defines ancestral vertebrate chromosomes
journal, August 2005


Ancient duplicated conserved noncoding elements in vertebrates: A genomic and functional analysis
journal, March 2006


Genomic regulatory blocks encompass multiple neighboring genes and maintain conserved synteny in vertebrates
journal, March 2007

  • Kikuta, H.; Laplante, M.; Navratilova, P.
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Genome Duplication, a Trait Shared by 22,000 Species of Ray-Finned Fish
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journal, May 2004


Ancient Noncoding Elements Conserved in the Human Genome
journal, December 2006


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Functional Properties of Natural Human PAX6 and PAX6(5a) Mutants
journal, February 2004

  • Chauhan, B. K.
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  • DOI: 10.1167/iovs.03-0968

PAX6 mutations: genotype-phenotype correlations
journal, May 2005

  • Tzoulaki, Ioanna; White, Ian M. S.; Hanson, Isabel M.
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  • DOI: 10.1186/1471-2156-6-27

Structure of the zebrafish snail1 gene and its expression in wild-type, spadetail and no tail mutant embryos
journal, December 1993


Genes involved in forebrain development in the zebrafish, Danio rerio
journal, December 1996


The upstream ectoderm enhancer in Pax6 has an important role in lens induction
journal, November 2001

  • Dimanlig, Patricia V.; Faber, Sonya C.; Auerbach, Woytek
  • Development, Vol. 128, Issue 22
  • DOI: 10.1242/dev.128.22.4415

Highly Conserved Non-Coding Sequences Are Associated with Vertebrate Development
journal, November 2004


Genomic Disorders: Molecular Mechanisms for Rearrangements and Conveyed Phenotypes
journal, December 2005


Hsp90 Selectively Modulates Phenotype in Vertebrate Development
journal, March 2007


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Linking Human Diseases to Animal Models Using Ontology-Based Phenotype Annotation
journal, November 2009


Evolution of a tissue-specific silencer underlies divergence in the expression of pax2 and pax8 paralogues
journal, January 2012

  • Ochi, Haruki; Tamai, Tomoko; Nagano, Hiroki
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Zebrafish Models of Rare Hereditary Pediatric Diseases
journal, May 2018


Transcriptional Rewiring of the Sex Determining dmrt1 Gene Duplicate by Transposable Elements
journal, February 2010


An update on the genetics of ocular coloboma
journal, May 2019

  • ALSomiry, Aisha S.; Gregory-Evans, Cheryl Y.; Gregory-Evans, Kevin
  • Human Genetics, Vol. 138, Issue 8-9
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The zebrafish model system in cardiovascular research: A tiny fish with mighty prospects
journal, March 2013

  • Poon, Kar Lai; Brand, Thomas
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  • DOI: 10.5339/gcsp.2013.4

Gonadal, Not Maternal, Acquisition of Duplicated pax6 Orthologs in Megalobrama Amblycephala
journal, April 2019

  • Pan, Qihua; Xue, Ting; Xia, Bilin
  • International Journal of Molecular Sciences, Vol. 20, Issue 7
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The zebrafish eye—a paradigm for investigating human ocular genetics
journal, September 2016


A single cell transcriptome atlas of the developing zebrafish hindbrain
journal, January 2020

  • Tambalo, Monica; Mitter, Richard; Wilkinson, David G.
  • Development
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Evolution and regulation of cellular periodic processes: a role for paralogues
journal, February 2010

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Lineage-specific adjacent IFNG and IL26 genes share a common distal enhancer element
journal, May 2012

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Exonic remnants of whole-genome duplication reveal cis-regulatory function of coding exons
journal, December 2009

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Duplicate dmbx1genes regulate progenitor cell cycle and differentiation during zebrafish midbrain and retinal development
journal, September 2010

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Expression of zebrafish pax6b in pancreas is regulated by two enhancers containing highly conserved cis-elements bound by PDX1, PBX and PREP factors
journal, May 2008

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Differences in enhancer activity in mouse and zebrafish reporter assays are often associated with changes in gene expression
journal, January 2012


Genes and signaling networks regulated during zebrafish optic vesicle morphogenesis
journal, September 2014


Replacing the wild type loxP site in BACs from the public domain with lox66 using a lox66 transposon
journal, January 2010

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Synorth: exploring the evolution of synteny and long-range regulatory interactions in vertebrate genomes
journal, January 2009


Uberon, an integrative multi-species anatomy ontology
journal, January 2012

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  • Genome Biology, Vol. 13, Issue 1
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Distinct functions of two olfactory marker protein genes derived from teleost-specific whole genome duplication
journal, November 2015

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Linking Human Diseases to Animal Models Using Ontology-Based Phenotype Annotation
journal, November 2009


Analysis of a Gene Regulatory Cascade Mediating Circadian Rhythm in Zebrafish
journal, February 2013


Transcriptional Rewiring of the Sex Determining dmrt1 Gene Duplicate by Transposable Elements
journal, February 2010


PAX6 Haplotypes Are Associated with High Myopia in Han Chinese
journal, May 2011


DNaseI Hypersensitivity and Ultraconservation Reveal Novel, Interdependent Long-Range Enhancers at the Complex Pax6 Cis-Regulatory Region
journal, December 2011


pitx2 Deficiency Results in Abnormal Ocular and Craniofacial Development in Zebrafish
journal, January 2012


Identification and Analysis of Conserved cis-Regulatory Regions of the MEIS1 Gene
journal, March 2012


Habenular Neurogenesis in Zebrafish Is Regulated by a Hedgehog, Pax6 Proneural Gene Cascade
journal, July 2016


Pax2/5/8 and Pax6 alternative splicing events in basal chordates and vertebrates: a focus on paired box domain
journal, July 2015


Zebrafish Models of Rare Hereditary Pediatric Diseases
journal, May 2018


The zebrafish model system in cardiovascular research: A tiny fish with mighty prospects
journal, March 2013

  • Poon, Kar Lai; Brand, Thomas
  • Global Cardiology Science and Practice, Vol. 2013, Issue 1
  • DOI: 10.5339/gcsp.2013.4

Functionalizing Bacterial Artificial Chromosomes with Transposons to Explore Gene Regulation
book, November 2011

  • Wolf, Hope M.; Iranloye, Oladoyin; Norford, Derek C.
  • Bacterial Artificial Chromosomes
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