DNA copy number losses in human neoplasms

Area of Science:

• Genomics
• Cancer Biology
• Molecular Oncology

Background:

• Recurrent DNA sequence copy number losses are hallmarks of human neoplasms.
• Comparative genomic hybridization (CGH) is a key technique for detecting these genomic alterations.
• Understanding these losses is crucial for identifying genes involved in tumorigenesis.

Purpose of the Study:

• To systematically review and tabulate recurrent DNA copy number losses across various human tumor types.
• To identify chromosomal regions frequently affected by deletions in cancer.
• To discuss the relevance of genes located in these deleted regions, including tumor suppressor and DNA repair genes.

Main Methods:

• Comprehensive literature review of 169 reports on comparative genomic hybridization.
• Tabulation of recurrent losses affecting chromosome arms in 73 distinct tumor types.
• Analysis of minimal common overlapping deleted regions across multiple tumor entities.

Main Results:

• Recurrent DNA copy number losses were identified in all chromosome arms, with varying frequencies.
• The most frequent losses were observed at 9p23-p24 (48%), 13q21 (47%), 6q16 (44%), and 6q26-q27 (44%).
• Specific chromosomal regions with high frequencies of loss implicate critical tumor suppressor and DNA repair genes.

Conclusions:

• Recurrent copy number losses are widespread in human cancers.
• The identified frequently deleted chromosomal regions are enriched for genes critical to cancer pathogenesis.
• This compilation provides a valuable resource for understanding the genetic basis of various tumor types.