Related Experiment Videos
Chromosomal changes pattern and gene amplification in T cell non-Hodgkin's lymphomas
M Renedo1, B Martinez-Delgado, E Arranz
1Department of Human Genetics, Centro Nacional de Investigaciones Oncologicas, Madrid, Spain.
Leukemia
|October 6, 2001
Summary
Comparative genomic hybridization (CGH) identified DNA copy number changes in T cell non-Hodgkin
Area of Science:
- Oncology
- Genetics
- Hematology
Background:
- T cell non-Hodgkin's lymphomas (T-NHL) are a diverse group of cancers with a poor prognosis.
- The underlying genetic alterations in T-NHL are not well understood.
- Comparative genomic hybridization (CGH) is a valuable tool for detecting DNA imbalances.
Purpose of the Study:
- To identify DNA sequence copy number changes in T-NHL using CGH.
- To investigate the potential biological and prognostic significance of these genetic alterations.
Main Methods:
- CGH was performed on 37 T-NHL samples (29 patients).
- Southern blot and fluorescence in situ hybridization (FISH) were used to analyze specific cancer-related genes.
Main Results:
- Abnormal CGH profiles were detected in 59% of diagnostic samples and 66% of all samples.
- Recurrent genetic changes included gains of the X chromosome (19%) and chromosome 13 deletions (10%).
- Low-level gene amplifications in the Xq26-28 region were confirmed by Southern blot and FISH.
Conclusions:
- CGH reveals frequent DNA copy number alterations in T-NHL.
- These genetic changes, particularly X chromosome alterations, may have clinical implications.
- Abnormal CGH profiles correlate with advanced disease stage, P53 overexpression, and higher proliferation.