Abstract
In a previous work we provided preliminary evidence of the existence of a putative tumor suppressor gene region on the distal part of chromosome 4 in gamma-radiation-induced T-cell lymphomas of (C57BL/6J x RF/J) F1 hybrid mice. This region, named as TLSR2 (Thymic Lymphoma Suppressor Region 2), was located centered at D4Mit54. A more detailed allelotype analysis in the mentioned tumors with new informative microsatellites on distal chromosome 4 region, as well as in thymic lymphomas induced with gamma-rays in F1 hybrids generated from reciprocal crosses between the strains C57BL/6J and BALB/cJ, and having in mind the new map position of D4Mit205b, allowed us to confirm the existence of TLSR2 and to define it more precisely as centered at D4Mit205b. In addition, we identified a new candidate region, named as TLSR3 (Thymic Lymphoma Suppressor Region 3), located between the Mom-1 locus and D4Mit68, as the site of another putative tumor suppressor region involved in thymic lymphomagenesis.
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