Methylation patterns replicate across cell divisions so transient experience becomes lifelong marks

Evidence

DNA methylation is the best-understood of these modifications. The methyl group — a carbon atom bonded to three hydrogens, abbreviated CH₃ — can attach to cytosine bases in the DNA, particularly where cytosine is followed immediately by guanine. These CpG sites, as they are called, are distributed across the genome with particular density in the promoter regions of genes. When a CpG site in a promoter region is methylated, it tends to silence the gene: the methylated DNA is condensed, inaccessible, unreadable. When it is unmethylated, the chromatin is open, the transcription machinery can bind, and the gene is expressed. … Crucially: methylation patterns can be copied when cells divide. The methyl groups on one strand of the double helix act as templates for methylating the complementary strand of the daughter cell. This is the mechanism by which a transient experience — something that happens during a sensitive developmental window — can leave a mark that is replicated across every subsequent cell division for the life of the organism. — , The Rod and the Child, 6801

Categorization

• DEFINE: Technical definitions of methylation, CpG sites, and gene silencing.
• XREF: The cell-division replication mechanism is the lynchpin for later claims about molecular permanence and intergenerational transmission. — connects to: Early-life methylation marks persist for life yet remain chemically reversible — , The Rod and the Child: A Global History…, 6791; Methylation of a gene promoter determines how loudly the glucocorticoid receptor gene is read — , The Rod and the Child: A Global History…, 6789; Corporal punishment is a prime candidate to leave lasting epigenetic marks — , The Rod and the Child: A Global History…, 6821 (+1 more)

Related

• Early-life methylation marks persist for life yet remain chemically reversible (similarity 0.88)
• Methylation of a gene promoter determines how loudly the glucocorticoid receptor gene is read (similarity 0.84)
• Holocaust offspring show a distinct epigenetic mark at a stress-regulatory gene (similarity 0.78)

Broader Connections

• Holocaust offspring show a distinct epigenetic mark at a stress-regulatory gene #exemplifies (0.80) — , The Rod and the Child, 7128
• Corporal punishment is a prime candidate to leave lasting epigenetic marks #exemplifies (0.75) — , The Rod and the Child, 6821