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Genetics

The Corynebacterium diphtheriae genome is a single circular chromosome that has no plasmids. These chromosomes have a high G+C content which is what contributes to their high genetic diversity. The high content of guanine and cytosine is not constant across the entire genome of the bacteria. There is a terminus of replication around the ~740kb region that causes a decrease in the G+C content. In other bacteria, it is often seen that the G+C content gets smaller near the terminus, but C. diphtheriae is a considerably strongly genome that has this occurrence. Chromosomal replication is one of the ways this happens within this genome.