Mammalian artificial chromosomes: A review.

Area of Science:

• Molecular Biology
• Genetics
• Chromosomal Engineering

Background:

• Mammalian artificial chromosomes (MACs) are engineered DNA structures.
• MACs require specific elements: centromere, replication origins, and telomeres.
• The goal is to create stable, functional artificial chromosomes for gene delivery.

Purpose of the Study:

• To outline strategies for assembling MACs.
• To discuss challenges in MAC construction, particularly centromere and replication origin integration.
• To explore the potential of MACs as advanced gene-transfer vectors.

Main Methods:

• Juxtaposition of centromeric, replication origin, and telomeric DNA elements.
• In vivo and in vitro assembly approaches.
• Recombination strategies to acquire functional centromeres from resident chromosomes.
• Positive and counterselection methods to facilitate assembly.

Main Results:

• Proposed strategies for MAC construction using telomeric arms and centromere acquisition.
• Demonstrated that MAC assembly does not alter host cell ploidy.
• Identified potential dosage effects of transgenes as a primary concern for host cells.

Conclusions:

• MACs offer insights into chromosomal function, evolution, and chromatin formation.
• MACs represent a promising platform for transferring large DNA sequences (Mb-long).
• Potential applications include regulated mammalian gene function and gene therapy.