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Differentially amplified chromosome 12 sequences in low- and high-grade osteosarcoma
David Gisselsson1, Eva Pålsson, Mattias Höglund
1Department of Clinical Genetics, University Hospital, Lund, Sweden. david.gisselsson@klingen.lu.se
Genes, Chromosomes & Cancer
|January 17, 2002
Summary
Amplification of chromosome 12 sequences, particularly on the short arm (12p), is linked to aggressive osteosarcoma development. This genetic alteration, often involving ring chromosomes, appears crucial in high-grade tumors.
Area of Science:
- Oncology
- Human Genetics
- Molecular Biology
Background:
- Osteosarcomas are aggressive cancers with complex chromosomal abnormalities.
- A subset of low-grade parosteal osteosarcomas shows simpler aberrations, often involving chromosome 12 ring chromosomes.
Purpose of the Study:
- To investigate differential amplification of chromosome 12 sequences in low-grade versus high-grade osteosarcomas.
- To determine the role of specific 12p and 12q regions in osteosarcoma pathogenesis.
Main Methods:
- Fluorescence in situ hybridization (FISH) was used to analyze copy numbers of CCND2, ETV6, KRAS2, D12S85 (12p), and MDM2 (12q) regions.
- Interphase and metaphase FISH were performed on 24 osteosarcoma samples.
- Multicolor single-copy FISH analyzed structural rearrangements in high-grade tumors.
Main Results:
- MDM2 amplification was present in all low-grade and most high-grade osteosarcomas with ring chromosomes.
- Overrepresentation of 12p sequences was more common in high-grade (9/19) than low-grade (1/5) osteosarcomas.
- Gain of 12p sequences occurred via ring chromosomes or complex genomic rearrangements.
Conclusions:
- Amplification of chromosome 12 sequences, especially 12p, may represent a key genetic pathway in aggressive osteosarcoma.
- The findings highlight distinct genetic mechanisms in low-grade versus high-grade osteosarcomas.