cytosinecytosine
Cytosinecytosine is not a standard, widely used term in molecular biology, but it appears in some writings as a way to refer to a motif involving two cytosine residues. In practice, the phrase may be used to denote either a CC dinucleotide on a single DNA strand (two adjacent cytosines) or a cytosine–cytosine base pair across complementary strands (a C–C mismatch) that can arise during DNA replication or repair. Because there is no single accepted definition, the meaning of cytosinecytosine is highly context dependent.
As a sequence feature, CC dinucleotides are common in genomes and contribute to local sequence context, influencing
Cytosine–cytosine mismatches refer to noncanonical base pairing between cytosines on opposite strands. Such mismatches destabilize the
In structural contexts, cytosine-rich regions can form nonstandard DNA structures under certain conditions, and these sequences
See also: cytosine, dinucleotide, DNA base pairing, mismatch repair, noncanonical DNA structures.