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Mitomycin C effect on Robertsonian translocations.

S Frias1, A Carnevale, M J Zavaleta

  • 1Genetic Department, Instituto Nacional de Pediatría, Mexico, D.F.

Annales De Genetique
|January 1, 1988
PubMed
Summary
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Robertsonian translocations can lead to mosaicism due to fragile centromeric sites. Mitomycin C treatment increased translocation dissociation in mosaic patients, indicating regional instability.

Area of Science:

  • Genetics
  • Cytogenetics
  • Molecular Biology

Background:

  • Robertsonian translocations are chromosomal abnormalities. Centromeric breaks and dissociation are potential causes of mosaicism.
  • The reunion site of acrocentric chromosomes in Robertsonian translocations may represent a fragile region.

Observation:

  • Lymphocyte cultures from 6 patients with Robertsonian translocations were treated with Mitomycin C (MMC).
  • MMC treatment significantly increased the number of cells with dissociated translocations in two patients already exhibiting mosaicism.

Findings:

  • A preferential centromeric break on the translocation was observed in the remaining patients.
  • This indicates inherent instability in the centromeric region of the Robertsonian translocation.

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Implications:

  • The study highlights the instability of Robertsonian translocation centromeres. This has implications for understanding mosaicism development and chromosomal instability syndromes.
  • Further research is needed to explore the viability of cells resulting from dissociation and the clinical relevance of these findings.