Identification of chromatin remodeling genes Arid4a and Arid4b as leukemia suppressor genes.

Journal of the National Cancer Institute
Mei-Yi WuArthur L Beaudet

Abstract

Leukemia evolves through a multistep process from premalignancy to malignancy. Epigenetic alterations, including histone modifications, have been proposed to play an important role in tumorigenesis. The involvement of two chromatin remodeling genes, retinoblastoma-binding protein 1 (Rbbp1/Arid4a) and Rbbp1-like 1 (Rbbp1l1/Arid4b), in leukemogenesis was not characterized. The leukemic phenotype of mice deficient for Arid4a with or without haploinsufficiency for Arid4b was investigated by serially monitoring complete blood counts together with microscopic histologic analysis and flow cytometric analysis of bone marrow and spleen from the Arid4a(-/-) mice or Arid4a(-/-)Arid4b(+/-) mice. Regulation in bone marrow cells of downstream genes important for normal hematopoiesis was analyzed by reverse transcription-polymerase chain reaction. Genotypic effects on histone modifications were examined by western blotting and immunofluorescence analysis. All statistical tests were two-sided. Young (2-5 months old) Arid4a-deficient mice had ineffective blood cell production in all hematopoietic lineages. Beyond 5 months of age, the Arid4a(-/-) mice manifested monocytosis, accompanied by severe anemia and thrombocytopenia. These sick Arid4a(-/...Continue Reading

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Methods Mentioned

BETA
flow cytometry

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