Chromosome Analysis Using Benchtop Flow Analysers and High Speed Cell Sorters

Area of Science:

• Cytogenetics
• Flow Cytometry
• Molecular Biology

Background:

• Bivariate chromosome analysis traditionally uses Hoechst (HO) and chromomycin A3 (CA3) DNA dyes.
• This method typically requires high-power lasers not found on conventional benchtop flow cytometers.
• Investigating alternative DNA dye combinations for accessible chromosome analysis is crucial.

Purpose of the Study:

• To evaluate chromosome peak resolution using different DNA dye combinations on various flow cytometers.
• To determine if standard benchtop flow cytometers can achieve reliable chromosome analysis.
• To compare results against a reference flow karyotype using established DNA dyes.

Main Methods:

• Human cell line chromosomes prepared using a modified polyamine isolation buffer.
• Bivariate flow karyotypes generated using 4'-6-diamidino-2-phenylindole (DAPI) or Hoechst with propidium iodide (PI).
• Comparison of flow cytometers with varying laser configurations against a Mo-Flo cell sorter reference.

Main Results:

• Good chromosome separation was achieved across most tested flow cytometers.
• The DNA dye combination of DAPI or Hoechst with PI yielded effective results.
• Analysis was successful even on benchtop flow cytometers with standard lasers.

Conclusions:

• Chromosome analysis and sorting are feasible on benchtop flow cytometers.
• The DNA dye combination of DAPI or Hoechst with PI is a viable alternative.
• This expands accessibility for chromosome analysis in research settings.