MBD3 is a part of the methyl-CpG binding protein family, recognizing and binding to methylated cytosine residues within CpG dinucleotides, influencing transcriptional repression. MBD3 plays a crucial role in gene expression regulation through DNA methylation involvement, essential for maintaining cellular identity and function. This interaction enables gene silencing in specific cell types, contributing to development, differentiation, and genomic stability. MBD3 interacts with other methyl-CpG binding protein family members, including MBD1, MBD2, and MeCP2, forming complexes that mediate transcriptional repression in response to DNA methylation. MBD proteins show high expression in somatic tissues, highlighting their significance in gene expression regulation across various biological contexts.