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Pleiotropy01:33

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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
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Related Experiment Video

Updated: May 6, 2026

An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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A Sox10 expression screen identifies an amino acid essential for Erbb3 function.

Kristina Buac1, Dawn E Watkins-Chow, Stacie K Loftus

  • 1Genetic Disease Research Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, United States of America.

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|September 6, 2008
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Summary

This study identifies a new mutation in the Erbb3 gene, crucial for neural crest development. The mutation impairs Erbb3 signaling, leading to developmental defects and advancing our understanding of neurocristopathies.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The neural crest (NC) is a transient embryonic cell population essential for forming diverse cell types, including peripheral neurons and melanocytes.
  • Disruptions in NC development cause neurocristopathies, a spectrum of human congenital disorders.
  • Understanding the genetic pathways governing NC development is critical for deciphering disease mechanisms.

Purpose of the Study:

  • To identify novel molecular pathways regulating neural crest development using a sensitized mouse mutagenesis screen.
  • To investigate the functional consequences of genetic alterations in neural crest development.
  • To understand the role of specific protein domains in receptor tyrosine kinase signaling.

Main Methods:

  • An N-ethyl-N-nitrosourea (ENU) mutagenesis screen was performed on a Sox10(LacZ/+) reporter mouse model.
  • Genetic mapping, sequencing, and complementation testing were used to identify and characterize mutations.
  • Biochemical analyses were conducted to assess receptor tyrosine kinase Erbb3 (ERBB3) protein expression, localization, and signaling activity.

Main Results:

  • A novel mutation, Erbb3(msp1), was identified, affecting neural crest patterning in homozygous embryos.
  • Erbb3(msp1) mutation leads to the absence of Sox10(LacZ) expression in cranial ganglia and sympathetic chain.
  • The Erbb3(msp1) mutation impairs ligand-induced ERBB3 phosphorylation, indicating reduced receptor signaling efficacy.

Conclusions:

  • The study highlights the critical role of a specific extracellular residue in ERBB3 receptor function and activation.
  • ENU mutagenesis is an effective tool for discovering genes and pathways involved in neural crest development.
  • This research provides insights into the molecular basis of neurocristopathies and the importance of precise receptor signaling.