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Efficient generation and mapping of recessive developmental mutations using ENU mutagenesis.
Bruce J Herron1, Weining Lu, Cherie Rao
1Genetics Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature Genetics
|January 31, 2002
Summary
N-ethyl-N-nitrosourea (ENU) mutagenesis in mice rapidly identifies genes essential for embryonic development. This focused approach efficiently maps mutations, aiding the characterization of recessive developmental loci.
Area of Science:
- Genetics
- Developmental Biology
- Genomics
Background:
- N-ethyl-N-nitrosourea (ENU) is a potent mutagen used to induce random single-nucleotide mutations in mice.
- Mutagenesis screens are valuable tools for identifying genes involved in biological processes.
- Focused genetic studies can be highly productive for characterizing specific biological functions.
Purpose of the Study:
- To demonstrate the utility of combining ENU mutagenesis with genetic mapping for rapid characterization of recessive embryonic lethal mutations.
- To identify novel genetic loci essential for normal embryonic development in mice.
Main Methods:
- Induction of mutations in mice using N-ethyl-N-nitrosourea (ENU).
- Screening of third-generation progeny at embryonic day 18.5 for developmental abnormalities.
- Genetic mapping of identified mutations using haplotype analysis in an outcross design.
Main Results:
- Ascertainment of 15 monogenic mutations from 54 analyzed families.
- Successful genetic mapping of seven mutations.
- Identification of the affected locus in two distinct mutant lines.
Conclusions:
- A hierarchical approach combining ENU mutagenesis and genetic mapping efficiently identifies genes crucial for embryonic development.
- This methodology is feasible with modest resources, facilitating focused genetic studies.