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A novel unstable mouse VNTR family expanded from SINE B1 elements
P Bois1, J Williamson, J Brown
1Department of Genetics, University of Leicester, United Kingdom. prsb1@le.ac.uk
Genomics
|May 8, 1998
Summary
Researchers identified a new family of mouse tandem repeat loci, MMS10, which show high mutation rates. This discovery aids in studying repeat instability and monitoring radiation-induced germline mutations in mice.
Area of Science:
- Genetics
- Molecular Biology
- Genomics
Background:
- Human hypervariable minisatellites are crucial for studying tandem repeat turnover.
- Mechanisms of minisatellite instability in other species remain largely unknown.
Purpose of the Study:
- To screen the mouse genome for variable number tandem repeat (VNTR) loci analogous to human minisatellites.
- To characterize the identified VNTR loci and assess their mutation rates and potential applications.
Main Methods:
- Genome screening of mice to identify VNTR loci.
- Isolation and characterization of a specific probe (MMS10).
- Estimation of germline mutation rates for the identified loci.
Main Results:
- Discovery of MMS10, a rodent-specific family of VNTR loci derived from GGCAGA repeat units within B1 short interspersed elements.
- Estimated mean germline mutation rate of 1.7% per offspring band for MMS10 loci.
- Observed variation in instability among individual loci, correlated with repeat array size.
Conclusions:
- The MMS10 family represents a novel resource for studying tandem repeat turnover mechanisms in mice.
- MMS10 loci offer an efficient method for monitoring germline mutations induced by agents like ionizing radiation.