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Chromosome aberrations in choroid plexus papillomas

M J Donovan1, E J Yunis, U DeGirolami

  • 1Department of Pathology, Children's Hospital of Boston, Massachusetts 02115.

Genes, Chromosomes & Cancer
|December 1, 1994
PubMed
Summary
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Karyotypic analysis of choroid plexus papillomas reveals frequent chromosomal gains, particularly involving chromosomes 7 and 12. These findings suggest specific chromosomal abnormalities may contribute to tumor development.

Area of Science:

  • Genetics
  • Oncology
  • Cytogenetics

Background:

  • Karyotypic data for choroid plexus papillomas (CPPs) are limited, with no consistent chromosomal aberrations identified to date.
  • Understanding the genetic landscape of CPPs is crucial for diagnosis and treatment strategies.

Purpose of the Study:

  • To investigate chromosomal aberrations in choroid plexus papillomas.
  • To identify potential recurrent genetic alterations in CPPs.

Main Methods:

  • Karyotyping of an index choroid plexus papilloma case.
  • Retrospective fluorescence in situ hybridization (FISH) analysis of eight additional CPPs using pericentromeric probes for chromosomes 7, 11, 12, 15, 16, 17, 18, and 20.
  • Image analysis to determine overall DNA content.

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Main Results:

  • The index case exhibited a stemline karyotype with multiple extra chromosomes: 52,XX, +7, +11, +12, +12, +15, +18, and additional copies of chromosomes 16, 17, and 20.
  • FISH analysis revealed extra signals for chromosomes 7 (5/8 cases), 12 (4/8 cases), and 15, 17, 18 (3/8 cases) in the additional CPPs.
  • Image analysis suggested the presence of additional chromosome gains beyond those specifically tested.

Conclusions:

  • This study identifies recurrent chromosomal gains, particularly involving chromosomes 7 and 12, in choroid plexus papillomas.
  • These findings contribute to the understanding of the genetic basis of CPPs and may have diagnostic implications.
  • Further investigation is warranted to explore the full spectrum of genetic alterations in these tumors.