Cited by 60melanin and skin pigmentationHedgehog Signaling Pathway StudiesCongenital gastrointestinal and neural anomalies

A sensitized mutagenesis screen identifies Gli3 as a modifier of Sox10 neurocristopathy

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Matera, Ivana, Watkins-Chow, Dawn E., Loftus, Stacie K., Hou, Ling, Incao, Arturo, Silver, Debra L., Rivas, Cecelia, Elliott, Eugene C. +2 more·2008·Human Molecular Genetics

Abstract

Haploinsufficiency for the transcription factor SOX10 is associated with the pigmentary deficiencies of Waardenburg syndrome (WS) and is modeled in Sox10 haploinsufficient mice (Sox10(LacZ/+)). As genetic background affects WS severity in both humans and mice, we established an N-ethyl-N-nitrosourea (ENU) mutagenesis screen to identify modifiers that increase the phenotypic severity of Sox10(LacZ/+) mice. Analysis of 230 pedigrees identified three modifiers, named modifier of Sox10 neurocristopathies (Mos1, Mos2 and Mos3). Linkage analysis confirmed their locations on mouse chromosomes 13, 4 and 3, respectively, within regions distinct from previously identified WS loci. Positional candidate analysis of Mos1 identified a truncation mutation in a hedgehog(HH)-signaling mediator, GLI-Kruppel family member 3 (Gli3). Complementation tests using a second allele of Gli3 (Gli3(Xt-J)) confirmed that a null mutation of Gli3 causes the increased hypopigmentation in Sox10(LacZ/+);Gli3(Mos1/)(+) double heterozygotes. Early melanoblast markers (Mitf, Sox10, Dct, and Si) are reduced in Gli3(Mos1/)(Mos1) embryos, indicating that loss of GLI3 signaling disrupts melanoblast specification. In contrast, mice expressing only the GLI3 repressor have normal melanoblast specification, indicating that the full-length GLI3 activator is not required for specification of neural crest to the melanocyte lineage. This study demonstrates the feasibility of sensitized screens to identify disease modifier loci and implicates GLI3 and other HH signaling components as modifiers of human neurocristopathies.

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  • Genetic modifier screens are commonly applied to identify genes that act in developmental or biochemical pathways in fruit flies, worms, and bacteria, but this approach is rare in the mouse.

    “Genetic modifier screens are commonly applied to identify genes that act in developmental or biochemical pathways in fruit flies, worms, and bacteria10; however, this approach is rare in the mouse11,12.”

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  1. Wilkinson, D.G. and Nieto, M.A. (1993). In Wassarman, P. and DePamphilis, M. (eds), Methods in Enzymology: Guide to Techniques in Mouse Development. Academic, San Diego, pp. 361-373.

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Authors
Matera, I., Watkins-Chow, D. E., Loftus, S. K., Hou, L., Incao, A., Silver, D. L., Rivas, C., Elliott, E. C., Baxter, L. L., & Pavan, W. J.
Affiliations
National Institutes of Health (US)
Corresponding author
Pavan, William J.
Venue
Human Molecular Genetics
Published
2008-04-07
Volume
17
Issue
14
Pages
2118-2131
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2135850846
Cited by
60
References
64
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2023: 2 · 2021: 3 · 2020: 3 · 2019: 4 · 2018: 4 · 2017: 2 · 2016: 2 · 2015: 1 · 2014: 7 · 2013: 6 · 2012: 4
FWCI
2.48
Type
journal article
Language
en
Open access
Licence
public-domain
Locations
  • Human Molecular Genetics (publishedVersion, public-domain)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Friedrich-Alexander-Universität Erlangen-Nürnberg
  • National Institutes of Health (n01hg065403-000)
  • National Human Genome Research Institute (N01 HG-65403)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (U01HD43430, U01HD043430)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Hedgehog Signaling Pathway Studies
  • Health Sciences › Medicine › Surgery › Congenital gastrointestinal and neural anomalies
Keywords
Gli3, Waardenburg syndrome, neurocristopathy, Hedgehog signaling, melanocyte lineage, hypopigmentation, genetic background effects
MeSH terms
Zinc Finger Protein Gli3, Animals, Base Sequence, Cell Differentiation, Chromosome Mapping, DNA-Binding Proteins, Embryo, Mammalian, Ethylnitrosourea, Female, Genetic Complementation Test, High Mobility Group Proteins, Humans, Male, Melanocytes, Mice, Inbred BALB C, Mice, Inbred C57BL, Mutagens, Nerve Tissue Proteins, Neural Crest, Pigmentation, Repressor Proteins, Transcription Factors, Waardenburg Syndrome, Mutagenesis, Codon, Nonsense, Gene Expression Regulation, Developmental, Mice, Kruppel-Like Transcription Factors, SOXE Transcription Factors

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