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Null mutations in the lin-31 gene indicate two functions during Caenorhabditis elegans vulval development
L M Miller1, H A Hess, D B Doroquez
1Department of Biology, Santa Clara University, Santa Clara, California 95053, USA. lmiller@scu.edu
Genetics
|December 5, 2000
Summary
The lin-31 gene, crucial for nematode vulval development, encodes a transcription factor. Mutations primarily affect its DNA-binding domain, revealing its critical role in cell fate specification.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- The lin-31 gene in *Caenorhabditis elegans* is essential for correct vulval cell fate specification.
- LIN-31 is a transcription factor belonging to the winged-helix family, known for binding specific DNA targets in various developmental processes.
Purpose of the Study:
- To characterize the functional consequences of various lin-31 mutations.
- To investigate the role of the DNA-binding domain in LIN-31 activity.
Main Methods:
- DNA sequencing of 19 lin-31 alleles.
- Phenotypic analysis of lin-31 mutants.
- Analysis of mutations within the DNA-binding domain.
Main Results:
- Sixteen of 19 alleles exhibited null or strong loss-of-function phenotypes.
- Two missense mutations were identified within the DNA-binding domain, likely impairing DNA binding.
- Deletions, transposon insertions, and frameshift mutations caused large-scale gene disruptions.
Conclusions:
- The null phenotype represents the typical outcome for most lin-31 alleles.
- The DNA-binding domain is critical for LIN-31 function.
- Mutant screens for vulval defects are likely to identify only null or strong alleles of lin-31.