Mammalian Chromosome Analysis and Sorting by Flow Cytometry

Area of Science:

• Molecular Biology
• Genetics
• Cytometry

Background:

• Flow cytogenetics analyzes single mitotic chromosomes in suspension.
• Flow karyograms reveal chromosome number, structure, DNA content, and aberrations like deletions and aneuploidy.
• This technique was crucial for the Human Genome Project, enabling chromosome sorting for gene mapping and DNA library construction.

Purpose of the Study:

• To compile existing protocols for preparing single-chromosome suspensions for flow cytometric analysis and sorting.
• To emphasize the importance of precise instrument setup and optimal sample processing for accurate flow cytogenetics data.
• To highlight the continued relevance of established protocols despite advancements in cytometry technology.

Main Methods:

• Detailed stepwise protocols for accumulating, isolating, and staining metaphase chromosomes.
• Methods include mitotic block and cell harvesting, propidium iodide isolation, and MgSO4/polyamine-based isolation.
• Support protocols cover swelling tests and chromosomal DNA molecular-weight determination.

Main Results:

• The compilation provides a comprehensive guide to established chromosome preparation methodologies.
• The protocols ensure accurate data resolvable to individual chromosomes.
• Despite technological advances, the simplicity and accuracy of these foundational protocols remain key.

Conclusions:

• Precise instrument setup and optimal sample processing are critical for reliable flow cytogenetics.
• The presented protocols offer a robust foundation for chromosome analysis and sorting.
• Flow cytogenetics continues to be a powerful tool for understanding chromosomal aberrations and advancing genomic research.