Homozygous Deletions and Point Mutations of the Rit1/Bcl11b Gene in Gamma-Ray Induced Mouse Thymic Lymphomas

Biochem Biophys Res Commun. 2003 Feb 7;301(2):598-603. doi: 10.1016/s0006-291x(02)03069-3.


Allelic loss (LOH) mapping and sequence analysis were conducted for gamma-ray induced mouse thymic lymphomas and a novel tumor suppressor gene, Rit1/Bcl11b, on chromosome 12 was isolated. Bi-allelic changes were found in 17 of the 66 p53-proficient lymphomas with Rit1 LOH but in only 2 of the 54 p53-deficient lymphomas. This suggests an association between the presence of functional p53 and inactivation of the Rit1 gene in the lymphoma development. Introduction of Rit1 into HeLa cells lacking Rit1 expression suppressed cell growth. These results indicate that loss-of-function mutations of Rit1 contribute to mouse lymphomagenesis and possibly to human cancer development.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alleles
  • Animals
  • Apoptosis / physiology
  • Cell Line
  • Female
  • Gamma Rays*
  • Gene Deletion
  • Genes, Tumor Suppressor*
  • Humans
  • Loss of Heterozygosity
  • Lymphoma / genetics*
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Neoplasms, Radiation-Induced / genetics*
  • Point Mutation
  • Thymus Neoplasms / genetics*
  • Tumor Suppressor Protein p53 / metabolism
  • ras Proteins / genetics*
  • ras Proteins / physiology


  • Tumor Suppressor Protein p53
  • RIT1 protein, human
  • Rit1 protein, mouse
  • ras Proteins