Chromosome analysis and sorting using flow cytometry

Area of Science:

• Plant genetics and genomics
• Cytometry and cell sorting
• Molecular biology

Background:

• Flow cytometry (flow cytogenetics) offers potential for plant genome fractionation.
• Large plant genomes present challenges for genetic and genomic studies.
• Previous limitations in preparing intact plant chromosomes hindered flow cytogenetics applications.

Purpose of the Study:

• To present a high-yielding protocol for preparing intact mitotic chromosomes from plant root tips.
• To enable efficient analysis and sorting of plant chromosomes using flow cytometry.
• To facilitate genetic and genomic research in plants with large genomes.

Main Methods:

• Mild formaldehyde fixation of root tips synchronized at metaphase.
• Mechanical homogenization for preparing intact chromosome solutions.
• Flow cytometry and cell sorting for chromosome analysis.

Main Results:

• A robust protocol for isolating intact mitotic chromosomes from seedling root tips was established.
• Isolated chromosomes exhibited well-preserved morphology and intact DNA.
• Chromosomes demonstrated resilience to shearing forces during flow sorting.

Conclusions:

• The developed protocol overcomes previous limitations in plant chromosome preparation for flow cytometry.
• This method simplifies plant genetics and genomics, particularly for species with large genomes.
• The intact chromosomes are suitable for diverse downstream molecular applications.