Efficient Formation of Single-copy Human Artificial Chromosomes.

Area of Science:

• Synthetic biology
• Epigenetics
• Mammalian cell engineering

Background:

• Budding yeast utilize DNA sequence-defined centromeres for chromosome inheritance.
• Mammals and other eukaryotes rely on large, epigenetic centromeres.
• Existing methods for human artificial chromosome (HAC) formation often result in DNA multimerization.

Approach:

• Developed a ~750 kb DNA construct designed to accommodate distinct inner and outer centromere chromatin types.
• Utilized yeast spheroplast fusion to streamline the delivery of the large DNA construct into mammalian cells.
• Enabled the formation of single-copy HACs, avoiding the multimerization issue.

Key Points:

• The large size of the DNA construct obviates the need for multimerization.
• Yeast spheroplast fusion provides an efficient delivery method for large DNA constructs.
• The approach facilitates the formation of stable, single-copy HACs.

Conclusions:

• This method allows for efficient formation of single-copy human artificial chromosomes.
• Faithful chromosome engineering is now achievable in metazoan cells.
• Advances centromere epigenetics applications in mammalian synthetic biology.