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Publication

Impaired Expression of Rearranged Immunoglobulin Genes and Premature p53 Activation Block B Cell Development in BMI1 Null Mice.

Cell reports | 2019

B cell development is a highly regulated process that requires stepwise rearrangement of immunoglobulin genes to generate a functional B cell receptor (BCR). The polycomb group protein BMI1 is required for B cell development, but its function in developing B cells remains poorly defined. We demonstrate that BMI1 functions in a cell-autonomous manner at two stages during early B cell development. First, loss of BMI1 results in a differentiation block at the pro-B cell to pre-B cell transition due to the inability of BMI1-deficient cells to transcribe newly rearranged Igh genes. Accordingly, introduction of a pre-rearranged Igh allele partially restored B cell development in Bmi1-/- mice. In addition, BMI1 is required to prevent premature p53 signaling, and as a consequence, Bmi1-/- large pre-B cells fail to properly proliferate. Altogether, our results clarify the role of BMI1 in early B cell development and uncover an unexpected function of BMI1 during VDJ recombination.

Pubmed ID: 30605667 RIS Download

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Associated grants

Agency: NCI NIH HHS, United States
Id: T32 CA009161
Agency: NCI NIH HHS, United States
Id: P30 CA016087
Agency: NCI NIH HHS, United States
Id: R21 CA206013
Agency: NCI NIH HHS, United States
Id: F30 CA203047
Agency: NIGMS NIH HHS, United States
Id: T32 GM007308
Agency: NCI NIH HHS, United States
Id: R01 CA148639
Agency: NCI NIH HHS, United States
Id: R21 CA155736

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