Dnmt1

Dnmt1 (DNA methyltransferase 1) is an enzyme that maintains and copies DNA modifications called methyl groups during cell division. These methyl groups act like markers that regulate gene activity, turning genes on or off without changing the underlying DNA sequence. Dnmt1 ensures that when a cell divides, the methylation pattern is preserved in the new cells, helping maintain proper gene expression and cellular identity. This process is essential for normal development, cellular function, and organism health, but can also be involved in diseases like cancer if regulation goes awry.