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Related Experiment Videos

Two wnt genes in Caenorhabditis elegans

G M Shackleford1, S Shivakumar, L Shiue

  • 1Department of Microbiology and Immunology, University of California San Francisco 94143.

Oncogene
|July 1, 1993
PubMed
Summary

Two new wnt genes, Ce-wnt-1 and Ce-wnt-2, were identified in Caenorhabditis elegans, showing conserved Wnt protein features and unique gene structures. Their expression is highest during embryonic development.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Wnt genes encode secreted signaling proteins crucial for development and growth across various species.
  • The nematode Caenorhabditis elegans serves as a model organism for studying conserved developmental pathways.

Purpose of the Study:

  • To characterize two newly identified wnt genes, Ce-wnt-1 and Ce-wnt-2, in Caenorhabditis elegans.
  • To analyze the structural and expression properties of these genes and their encoded proteins.

Main Methods:

  • Polymerase chain reaction (PCR)-based screening of genomic DNA.
  • cDNA library screening by the Caenorhabditis Genome Project.
  • Analysis of cDNA sequences to determine protein length, domains, and conserved residues.

Related Experiment Videos

  • RNA transcript analysis and Northern blotting.
  • Gene mapping to specific chromosomes.

    • Main Results:

    • Identified and characterized two full-length Caenorhabditis elegans wnt genes, Ce-wnt-1 and Ce-wnt-2.
    • Encoded proteins exhibit similarities to other Wnt proteins, including conserved cysteine residues and signal peptides.
    • Ce-wnt-1 displays a unique exon-intron structure with nine coding exons, differing from mammalian and insect orthologs.
    • Both genes produce major RNA transcripts of 1.4 kb (Ce-wnt-1) and 1.5 kb (Ce-wnt-2).
    • RNAs are detected in all life stages, with peak abundance during embryonic development.
    • Ce-wnt-1 maps to chromosome II, and Ce-wnt-2 maps to chromosome IV.

    Conclusions:

    • Ce-wnt-1 and Ce-wnt-2 represent functional wnt genes in Caenorhabditis elegans with conserved Wnt protein characteristics.
    • The distinct gene structure of Ce-wnt-1 suggests evolutionary divergence in gene regulation.
    • Differential expression patterns indicate a significant role for these wnt genes during embryonic development in nematodes.