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Mouse galactokinase: isolation, characterization, and location on chromosome 11
Y Ai1, N A Jenkins, N G Copeland
1Department of Ophthalmology, School of Medicine, University of Pennsylvania, Philadelphia 19104, USA.
Genome Research
|August 1, 1995
Summary
Galactokinase deficiency causes cataracts. Researchers isolated the mouse galactokinase gene, finding it highly similar to human galactokinase and mapping it to mouse chromosome 11, paving the way for a knockout model.
Area of Science:
- Biochemistry
- Genetics
- Ophthalmology
Background:
- Elevated galactose levels result from enzyme defects, notably galactokinase deficiency.
- Galactokinase deficiency leads to congenital cataracts in infants and presenile cataracts in adults.
Purpose of the Study:
- To isolate and characterize the mouse galactokinase cDNA.
- To determine the chromosomal location of the mouse galactokinase gene.
- To establish a foundation for creating a galactokinase deficiency knockout model.
Main Methods:
- Mouse galactokinase cDNA isolation and sequencing.
- Amino acid sequence homology analysis with human galactokinase.
- Interspecific backcross analysis for gene mapping.
- Tissue expression analysis.
Main Results:
- The mouse galactokinase cDNA was isolated.
- It shows 88% amino acid sequence identity to human galactokinase.
- The gene is expressed in all examined tissues.
- Galactokinase maps to distal mouse chromosome 11, homologous to human 17q22-25.
Conclusions:
- The mouse galactokinase gene is highly conserved and widely expressed.
- Its mapping to mouse chromosome 11 provides a valuable resource for genetic studies.
- The availability of the mouse gene facilitates the development of a galactokinase deficiency model.