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Mapping the mouse craniofacial mutation first arch (Far) to chromosome 2.
1Department of Medical Genetics, University of British Columbia, Vancouver, B.C. Canada.
The Journal of Heredity
|September 1, 1991
Summary
The First arch (Far) mutation in mice causes craniofacial defects and is closely linked to the Ulnaless marker on chromosome 2. This genetic mapping suggests a potential connection to the Hox-4 gene cluster.
Area of Science:
- Genetics
- Developmental Biology
- Mouse Models
Background:
- The First arch (Far) mutation in mice is associated with severe craniofacial abnormalities.
- Understanding the genetic basis of craniofacial development is crucial for identifying causes of birth defects.
Purpose of the Study:
- To perform linkage studies to map the genetic location of the First arch (Far) mutation.
- To investigate the chromosomal location of the Far mutation in relation to known markers.
Main Methods:
- Linkage analysis was conducted using chromosome 2 markers: nonagouti, pallid, and Ulnaless.
- Genetic distances (centimorgans, cM) were calculated between Far and the selected markers.
Main Results:
- The Far mutation showed loose linkage to nonagouti (24-37 cM) and closer linkage to pallid (13-28 cM).
- A close linkage was observed between Far and Ulnaless (2.3 +/- 1.5 cM).
- The embryological defect in Far mutants is localized to the anterior first branchial arch.
Conclusions:
- The Far mutation is genetically mapped to a region on chromosome 2, closely linked to the Ulnaless marker.
- The proximity of Far to Ulnaless and the Hox-4 gene cluster suggests potential involvement in craniofacial development regulation.