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Deletion mapping of chromosome 4 in head and neck squamous cell carcinoma
M A Pershouse1, A K El-Naggar, K Hurr
1Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston 77030, USA.
Abstract:
Genomic deletions involving chromosome 4 have recently been implicated in several human cancers. To identify and characterize genetic events associated with the development of head and neck squamous cell carcinoma (HNSCC), a fine mapping of allelic losses associated with chromosome 4 was performed on DNA isolated from 27 matched primary tumor specimens and normal tissues. Loss of heterozygosity (LOH) of at least one chromosome 4 polymorphic allele was seen in the majority of tumors (92%). Allelic deletions were confined to short arm loci in four tumors and to the long arm loci in 12 tumors, suggesting the presence of two regions of common deletion. One region of frequent deletion was centered at D4S405 on 4p and included the loci D4S1546 to D4S428 in approximately 41% of the tumors. The common region of deletion on 4q was more complex and extended from D4S1571 to D4S1573. Frequent genetic alterations were observed within this region (4q25) and one marker, D4S407, exhibited a high frequency of LOH (>75%). These results indicate that alterations of chromosome 4 regions are associated with HNSCC tumorigenesis and further localizes the regions that may harbor tumor suppressor genes.
Insights
Genomic deletions on chromosome 4 are linked to head and neck squamous cell carcinoma (HNSCC). This study fine-mapped allelic losses, identifying specific deletion regions on chromosome 4p and 4q associated with HNSCC development.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Genomic deletions on chromosome 4 are implicated in various human cancers.
- Understanding genetic events in head and neck squamous cell carcinoma (HNSCC) is crucial for identifying potential tumor suppressor genes.
Purpose of the Study:
- To perform fine mapping of allelic losses on chromosome 4 in HNSCC.
- To identify and characterize specific regions of common deletion associated with HNSCC development.
Main Methods:
- Analysis of DNA from 27 matched primary HNSCC tumors and normal tissues.
- Fine mapping of allelic losses using polymorphic markers on chromosome 4.
- Assessment of Loss of Heterozygosity (LOH) frequencies at specific loci.
Main Results:
- Loss of heterozygosity (LOH) on chromosome 4 was observed in 92% of HNSCC tumors.
- Two distinct regions of common deletion were identified: one on 4p (centered at D4S405) and a complex region on 4q (4q25).
- The 4q25 region, specifically marker D4S407, showed a high frequency of LOH (>75%).
Conclusions:
- Alterations in specific chromosome 4 regions are significantly associated with HNSCC tumorigenesis.
- The identified deletion regions, particularly on 4q25, likely harbor tumor suppressor genes critical for HNSCC development.
- Further investigation into these regions may reveal novel therapeutic targets for HNSCC.