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Immunoglobulin Gene Sequence Analysis In Chronic Lymphocytic Leukemia: From Patient Material To Sequence Interpretation
09:02

Immunoglobulin Gene Sequence Analysis In Chronic Lymphocytic Leukemia: From Patient Material To Sequence Interpretation

Published on: November 26, 2018

Cellular origin and pathophysiology of chronic lymphocytic leukemia

Marc Seifert1, Ludger Sellmann, Johannes Bloehdorn

  • 1Institute of Cell Biology (Cancer Research), University of Duisburg-Essen, Essen 45122, Germany.

The Journal of Experimental Medicine
|October 24, 2012
PubMed

Insights

Chronic lymphocytic leukemia (CLL) originates from distinct CD5+ B cell subsets. Unmutated CLL arises from mature CD5+ B cells, while mutated CLL develops from a unique CD5+CD27+ post-germinal center B cell population.

Area of Science:

  • Immunology
  • Hematology
  • Oncology

Background:

  • The cellular origin of chronic lymphocytic leukemia (CLL) remains unclear, hindering a full understanding of its pathogenesis.
  • Identifying the precise cell of origin is crucial for developing targeted therapies.

Purpose of the Study:

  • To elucidate the cellular origins of chronic lymphocytic leukemia (CLL) by analyzing B cell subsets.
  • To identify novel protein markers associated with CLL pathogenesis.

Main Methods:

  • Transcriptome analysis of CLL and normal human B cell subsets from blood and spleen.
  • Analysis of immunoglobulin variable (IgV) gene rearrangements and B cell surface markers (CD5, CD27).
  • Proteomic analysis to identify deregulated transcription factors.

Main Results:

  • Unmutated CLL originates from unmutated mature CD5+ B cells.
  • Mutated CLL arises from a distinct CD5+CD27+ post-germinal center B cell subset.
  • Stereotyped V gene rearrangements in CD5+ B cells support their role in CLL development. Oligoclonal expansions in CD5+ B cells suggest an early phase of CLL development.
  • Novel deregulated transcription factors, including EBF1 and KLF, were identified.

Conclusions:

  • CLL originates from specific CD5+ B cell populations, with distinct subsets giving rise to unmutated and mutated forms.
  • The findings reveal a previously unrecognized B cell subset involved in mutated CLL development.
  • Identification of novel transcription factors provides new avenues for understanding CLL pathogenesis and potential therapeutic targets.

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