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Related Experiment Videos

Distinct chromosome 3 abnormalities in persistent polyclonal B-cell lymphocytosis.

E Callet-Bauchu1, S Gazzo, C Poncet

  • 1Laboratoire Central d'Hématologie, Centre Hospitalier Lyon Sud, Pierre-Bénite, and UPRES-JE "Pathologie des Cellules Lymphoïdes," Université Claude Bernard Lyon-1, France.

Genes, Chromosomes & Cancer
|September 29, 1999
PubMed
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Persistent polyclonal B-cell lymphocytosis (PPBL) involves a rare B-cell expansion. This study reveals trisomy 3 as a recurrent cytogenetic change alongside the known isochromosome 3q, indicating chromosome 3 instability in PPBL.

Area of Science:

  • Hematology
  • Cytogenetics
  • Oncology

Background:

  • Persistent polyclonal B-cell lymphocytosis (PPBL) is a rare B-lymphocyte disorder of unknown cause.
  • It is characterized by polyclonal B-cell expansion, elevated IgM, and a specific chromosomal abnormality: isochromosome 3q.
  • Previous understanding identified only the isochromosome 3q (+i(3)(q10)) as the sole cytogenetic change.

Purpose of the Study:

  • To investigate the cytogenetic landscape of PPBL beyond the established isochromosome 3q.
  • To determine if other chromosomal abnormalities are consistently present in PPBL cases.
  • To elucidate the distribution of chromosomal abnormalities within the B-lymphocyte population in PPBL.

Main Methods:

  • Conventional cytogenetic analysis and Fluorescence In Situ Hybridization (FISH) were performed on four PPBL cases.

Related Experiment Videos

  • Immunophenotypic studies confirmed B-lymphocyte polyclonality.
  • Polymerase Chain Reaction (PCR) assessed immunoglobulin heavy chain (IGH) rearrangements.
  • Simultaneous fluorescence immunophenotyping and interphase cytogenetics (FICTION) was used to analyze chromosomal abnormality distribution.

    • Main Results:

    • All four PPBL cases exhibited the characteristic +i(3)(q10).
    • Two patients also showed unrelated clones with trisomy 3 (+3) via banding techniques.
    • FISH confirmed the presence of both +i(3)(q10) and +3 in all evaluated cases.
    • FICTION analysis demonstrated that both chromosomal abnormalities were randomly distributed among B-lymphocytes.

    Conclusions:

    • Trisomy 3 (+3) is identified as a recurrent cytogenetic abnormality in PPBL, in addition to +i(3)(q10).
    • These findings suggest an increased frequency of chromosome 3 instability in PPBL.
    • The random distribution of these abnormalities implies a potential early event in the pathogenesis of this lymphoproliferative disorder.