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A quantitative-trait locus controlling peripheral B-cell deficiency maps to mouse Chromosome 15
K A Hoag1, K Clise-Dwyer, Y H Lim
1Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin-Madison, 53706, USA.
Immunogenetics
|September 26, 2000
Summary
Peripheral B-lymphocyte deficiency in A/WySnJ mice is caused by rapid B cell apoptosis. A significant quantitative-trait locus (QTL) linked to this defect was mapped to Chromosome 15.
Area of Science:
- Immunology
- Genetics
- Mouse Models
Background:
- Peripheral B-lymphocyte homeostasis relies on complex regulatory processes.
- A/WySnJ mice exhibit disturbed B-lymphocyte homeostasis, leading to deficiency due to rapid B cell apoptosis, while B lymphopoiesis remains normal.
Purpose of the Study:
- To map the quantitative-trait locus (QTL) responsible for peripheral B-lymphocyte deficiency in A/WySnJ mice.
- To investigate the genetic basis of B-cell apoptosis in the A/WySnJ mouse strain.
Main Methods:
- Crossed A/WySnJ and CAST/Ei mouse strains to generate F2 progeny.
- Phenotyped F2 mice for splenic B-cell percentage.
- Utilized simple-sequence length polymorphism (SSLP) mapping to identify QTLs linked to B-cell deficiency.
Main Results:
- Identified minimally 1.9 QTLs controlling peripheral B-lymphocyte deficiency in the (A/WySnJxCAST/Ei)F2 cross.
- Genome scan revealed linkage between B-cell deficiency and Chromosome 15 markers.
- A significant QTL was localized to the middle region of Chromosome 15 (30-45 cM).
Conclusions:
- A major QTL contributing to peripheral B-lymphocyte deficiency in A/WySnJ mice is located on Chromosome 15.
- This study refines the genetic mapping of B-cell homeostasis regulatory loci.
- The findings provide a basis for further investigation into the specific genes involved in B-cell apoptosis.