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Human chromosomal region 13q14 is a deletion hotspot in prostate cancer, multiple myeloma, and chronic lymphocytic leukemia. This region is believed to host multiple tumor suppressors. Chromosome Condensation 1-like ( CHC1L ) is located at 13q14, and found within the smallest common region of loss of heterozygosity in prostate cancer. Decreased expression of  CHC1L  is linked to pathogenesis and progression of both prostate cancer and multiple myeloma. However, there is no direct evidence for  CHC1L ’s putative tumor suppressing role in current literature. Presently, we describe the generation and characterization of  Chc1L  knockout mice.  Chc1L   -/-  mice do not develop cancer at a young age, but bone marrow and spleen cells from 8–12 week-old mice display an exaggerated proliferative response. By approximately two years of age, knockout and heterozygote mice have a markedly increased incidence of tumorigenesis compared to wild-type controls, with tumors occurring mainly in the spleen, mesenteric lymph nodes, liver and intestinal tract. Histopathological analysis found that most heterozygote and knockout mice succumb to either Histiocytic Sarcoma or Histiocyte-Associated Lymphoma. Our study suggests that  Chc1L  is involved in suppression of these two histiocyte-rich neoplasms in mice and supports clinical data suggesting that  CHC1L  loss of function is an important step in the pathogenesis of cancers containing 13q14 deletion.

Chromosome Condensation 1-Like (Chc1L) Is a Novel Tumor Suppressor Involved in Development of Histiocyte-Rich Neoplasms