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Updated: Oct 1, 2025

Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence
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Impaired B cell terminal differentiation in B cell-specific knockout mice of cell death-defying factor anamorsin

Yuri Hamanaka1, Akira Tanimura1, Takafumi Yokota1

  • 1Department of Hematology and Oncology, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan.

Biochemical and Biophysical Research Communications
|March 8, 2022
PubMed

Insights

Anamorsin (AM) is crucial for mature B cell development. Deleting AM in B cells of mice led to fewer mature B cells, indicating AM

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Anamorsin (AM) is an anti-apoptotic molecule.
  • AM-deficient mice are embryonic lethal, limiting adult cell studies.

Purpose of the Study:

  • To investigate the role of AM in adult B cell development.
  • To overcome embryonic lethality using conditional knockout mice.

Main Methods:

  • Generated Anamorsin conditional knockout (AMflox/flox) mice.
  • Utilized the Cre-loxP system for cell type-specific gene deletion.
  • Analyzed B cell populations in CD19-Cre/AMflox/flox mice using flow cytometry.

Main Results:

  • CD19-Cre/AMflox/flox mice showed reduced B220+ B cells in spleen, blood, and lymph nodes.
  • A significant decrease in mature follicular type I B cells was observed.
  • AM deletion specifically in B cells impaired B cell maturation.

Conclusions:

  • Anamorsin plays a critical role in the generation and maturation of B cells.
  • Conditional knockout models are essential for studying essential genes with embryonic lethal phenotypes.
Keywords:
AnamorsinB cell differentiationGene knockoutHematopoiesisIron-sulfur prroteinLymphocyte

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