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Chronic multifocal osteomyelitis, a new recessive mutation on chromosome 18 of the mouse
L Byrd1, M Grossmann, M Potter
1Laboratory of Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
Abstract:
Mice with tail kinks and deformities in their lower extremities were observed in a litter of C.D2-Qa-2+N6F15 mice. A mutant line that exhibits this phenotype in 100% of its offspring was established by subsequent breeding. The abnormalities resembled to some degree those found in a human syndrome termed chronic recurrent multifocal osteomyelitis (CRMO). Accordingly, we name the new mutation chronic multifocal osteomyelitis (cmo). Breeding analysis showed that the defect was determined by a single autosomal recessive gene. Restriction fragment length polymorphism (RFLP) analysis of progeny from a backcross between Mus musculus domesticus (CLA) and C.D2-Qa-(2+)-cmo/cmo indicated that the cmo gene resides on mouse Chromosome 18.
Insights
Researchers identified a new mouse mutation causing tail kinks and limb deformities, named chronic multifocal osteomyelitis (cmo). This autosomal recessive mutation resides on mouse Chromosome 18 and models human CRMO.
Area of Science:
- Genetics
- Developmental Biology
- Mouse Models
Background:
- A spontaneous mutation in mice presented with tail kinks and lower limb deformities.
- These abnormalities showed similarities to human chronic recurrent multifocal osteomyelitis (CRMO).
Purpose of the Study:
- To establish and characterize a new mouse mutant line exhibiting skeletal abnormalities.
- To determine the genetic basis and chromosomal location of the identified mutation.
Main Methods:
- Establishing a mutant mouse line through selective breeding.
- Performing genetic linkage analysis, including Restriction Fragment Length Polymorphism (RFLP) on backcross progeny.
Main Results:
- A stable mutant line with 100% penetrance for the observed phenotype was established.
- The mutation was determined to be caused by a single autosomal recessive gene.
- RFLP analysis mapped the cmo gene to mouse Chromosome 18.
Conclusions:
- The new mouse mutation, designated chronic multifocal osteomyelitis (cmo), serves as a valuable model for studying CRMO.
- The genetic and chromosomal localization provides a foundation for further molecular investigation of the cmo gene.