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CtIP is essential for early B cell proliferation and development in mice
Xiangyu Liu1,2, Xiaobin S Wang1,3, Brian J Lee1
1Institute for Cancer Genetics, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY.
The Journal of Experimental Medicine
|May 18, 2019
Summary
CtBP-interacting protein (CtIP) is crucial for early B cell development and proliferation. Its loss in proliferating B cells causes cell death, highlighting a stage-specific role in B cell biology.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- B cell development necessitates robust proliferation and immunoglobulin gene processing.
- CtBP-interacting protein (CtIP) is a key factor in DNA repair pathways, including end resection.
Purpose of the Study:
- To investigate the role of CtIP in B cell development and proliferation.
- To elucidate the stage-specific functions of CtIP in B lymphocytes.
Main Methods:
- Analysis of B cell development in CtIP-deficient models.
- Assessment of cell cycle progression, DNA damage response, and genomic stability.
- Investigation of CtIP phosphorylation sites (T847, T859) and their functional significance.
Main Results:
- CtIP is essential for early B cell development but not for naive B cells.
- CtIP deficiency in proliferating B cells leads to ATM hyperactivation, G2/M arrest, genomic instability, and cell death.
- Phosphorylation of CtIP at T847 (by CDK) is critical for B cell proliferation, while T859 phosphorylation (by ATM/ATR) is important for end resection in G1-arrested cells.
Conclusions:
- CtIP plays a critical, stage-specific role in B cell proliferation, distinct from its function in DNA repair of G1-arrested cells.
- Distinct phosphorylation events on CtIP regulate its functions in B cell proliferation versus DNA end resection.
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