Purification of cybrids by fluorescence-activated cell sorting.

Area of Science:

• Cell Biology
• Genetics
• Biotechnology

Background:

• Cytoplast-cell fusion is a key technique for creating cybrids, which contain nuclear DNA from one cell and mitochondrial DNA from another.
• Existing methods for isolating pure cybrids are often inefficient and labor-intensive.
• Mitochondrial DNA (mtDNA) plays a crucial role in cellular energy production and is implicated in various diseases.

Purpose of the Study:

• To develop and validate a general method for the efficient isolation and purification of viable cybrids from cultured mammalian cells.
• To achieve a high enrichment of cybrids from the initial fusion mixture.
• To enable detailed molecular studies of mitochondrial DNA gene expression and mutagenesis.

Main Methods:

• Selective in vivo staining of cytoplast mitochondria using rhodamine 123.
• Fusion of stained cytoplasts with recipient cell lines.
• Cell sorting of the fusion mixture based on forward angle scatter and fluorescence.
• Short-term culture to eliminate non-adherent cytoplasts.

Main Results:

• The method yields substantial numbers of viable cybrids with high purity (75-100%).
• Achieved an enrichment of 1,000- to 10,000-fold over the initial fusion mixture.
• Contaminating cytoplasts were eliminated within 12 hours of culture.

Conclusions:

• This novel method provides an efficient and robust way to purify cybrids.
• The purified cybrids are suitable for in-depth molecular investigations of mtDNA.
• This technique facilitates the specific induction and study of new mtDNA mutants.