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[Detection of numerical chromosomal aberrations by FISH in "DNA-diploid" head and neck squamous cell carcinomas]
S Nakai1, K Katsura, H Sugihara
1Dept. of Pathology, Kyoto Prefectural University of Medicine.
Abstract:
We applied Fluorescence In Situ Hybridization to DNA-diploid head and neck squamous cell carcinomas to detect numerical chromosomal aberrations. Using centromeric repetitive probes of chromosomes 1, 7, 11, 17, X, and Y, we detected numerical aberrations of chromosomes in 4 of the 7 tumors examined, the main line of one tumor showed trisomy 1, while the other 3 tumors had subpopulations that showed trisomy or monosomy of 1 or 2 chromosomes examined. We found polyploidy by cytofluorometry in all 4 tumors with numerical chromosomal aberrations. These results suggest that from DNA-diploid tumors with polyploidy, subpopulation that are aneuploid at the chromosome level may arise before the ploidy of the main line shifts to over DNA-aneuploidy.
Insights
Chromosomal aberrations in head and neck squamous cell carcinomas were investigated. DNA-diploid tumors with polyploidy may develop aneuploid subpopulations before overall DNA aneuploidy.
Area of Science:
- Oncology
- Genetics
- Cytogenetics
Context:
- Head and neck squamous cell carcinomas (HNSCC) are a significant group of cancers.
- Understanding chromosomal abnormalities is crucial for HNSCC progression.
- DNA content analysis and chromosomal aberration detection are key research areas.
Purpose:
- To investigate numerical chromosomal aberrations in DNA-diploid HNSCC.
- To correlate polyploidy with aneuploidy in HNSCC subpopulations.
- To explore the early stages of chromosomal instability in HNSCC.
Summary:
- Fluorescence In Situ Hybridization (FISH) was used to examine numerical chromosomal aberrations in 7 DNA-diploid HNSCC.
- Four out of seven tumors exhibited chromosomal aberrations, including trisomy 1, trisomy/monosomy of chromosomes 1 or 2 in subpopulations.
- Polyploidy was detected in all tumors with numerical aberrations, suggesting a potential pathway for aneuploid subpopulation development.
Impact:
- These findings suggest a model where polyploidy in DNA-diploid tumors precedes the emergence of aneuploid subpopulations.
- This provides insights into the early genomic instability in HNSCC.
- Understanding these early events could inform future diagnostic and therapeutic strategies for HNSCC.