How do yeast artificial chromosomes help scientists study large genomes?

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DNA extraction and recombinant DNA technology — recombinant DNA The process of DNA extraction is necessary to isolate molecules of DNA from cells or tissues. A series of steps, including the use of protease enzymes to strip proteins from the DNA, are required for isolating pure DNA that is suitable for use in later procedures, such as cloning or sequencing.

Yeast artificial chromosomes (YACs) are specialized vectors derived from the autonomously replicating plasmids of the yeast Saccharomyces cerevisiae. They are essential tools in genetic engineering for studying large genomes, such as the human genome, primarily because they possess the unique capacity to carry the largest DNA inserts of any available cloning vector.1

When introduced into yeast cells, a YAC functions similarly to a natural chromosome, ensuring that the large segments of foreign DNA it carries are replicated and segregated properly into daughter cells during division. By allowing scientists to clone and maintain massive, continuous stretches of genomic DNA, YACs facilitate the creation of comprehensive DNA libraries that are much more efficient to map and analyze than those constructed with smaller-capacity vectors like plasmids or lambda phage.1