Cancer Cytogenetics: Deep Roots, New Branches in the Age of Omics

Area of Science:

• Genetics
• Oncology
• Genomics

Background:

• Cytogenetics, the study of chromosomes, has been predicted to become obsolete due to the rise of omics technologies.
• Despite these predictions, cytogenetics has continuously evolved, incorporating new methodologies.

Purpose of the Study:

• To demonstrate that cytogenetics is not obsolete but remains a vital component of modern cancer research.
• To highlight the essential insights provided by cytogenetics into chromosome structure, genome architecture, and fusion-gene mechanisms in the era of omics.

Main Methods:

• Review of classical cytogenetic techniques (staining, banding).
• Incorporation of modern methodologies: fluorescence in situ hybridization (FISH), array comparative genomic hybridization (aCGH), high-throughput sequencing, and optical genome mapping.
• Integration of classical and genome-wide approaches.

Main Results:

• Cytogenetics has evolved from basic microscopy to sophisticated genome-wide technologies.
• New approaches have revealed unprecedented details of chromosome structure and behavior in cancer.
• Cytogenetics has uncovered catastrophic genomic events and led to new concepts like cytogenomics and chromosomics.

Conclusions:

• Cytogenetics, encompassing the study of chromosome structure and behavior, extends beyond chromosome banding.
• Chromosomes are indispensable for understanding genome architecture, chromosomal instability, and fusion-gene mechanisms in neoplasia.
• Modern cytogenetics integrates classical and advanced genome-wide technologies, underscoring its enduring importance in interpreting cancer genome complexity.