Cellular Memory Encoding

When a cell divides, one of the characteristics passed on from mother to daughter cell are “memories.”Unlike memories that rely on neuron networks in the brain, these memories are located in each cell.. They are encoded through past experiences of the mother cell which are then passed on to the daughter cell just through one cell and its processes. 

Usually, cellular memory is encoded through epigenetics. Epigenetics is the way DNA can modify itself without directly affecting the base pairing of the DNA. Cells control their DNA through chemical tags that attach to the DNA directly or to the histones that surround the DNA. These chemical tags toggle genes on and off like light switches. This causes the cells to remember events or at least their impact on the cell, thus creating “memories.” These memories imparted by epigenetics can be edited in both directions with the ability to block access to the memories. The off switch is a small molecule in a protein group which attaches to the surface of a gene to turn it off, and conversely detaches itself to turn genes, like fat storage, on. For histone modifications, acetyl groups relax the coils of the histone, rendering the DNA to become easier to decipher. This causes the DNA to be more expressed because it's more visible. 

During mitosis – when the cell splits into two daughter cells – the DNA replicated still has all the chemical tags of the mother cell. This activates some cells and deactivates others depending on the cell’s past experiences. During the G1 phase epigenetic marks are read, and specific gene expression programs are re-established in daughter cells. At S Phase, DNA replicates, and existing epigenetic signals on the parental chromosomes guide enzymes to duplicate these landmarks on the new chromosome strands. G2 Phase sees the replicated epigenetic marks stabilized and checked to ensure cell-type identity is preserved. Lastly, during mitosis, epigenetic determinants are distributed between daughter cells, preparing the cell to efficiently restore its transcriptional program upon exiting division. This sequence of events ensures the cell doesn’t lose the identity it has as part of a larger organism while still undergoing “evolution” and adapting to surroundings.

References:

Epigenetic Memory in Development and Disease: Unraveling the Mechanism - PMC, pmc.ncbi.nlm.nih.gov/articles/PMC7225062/ . Accessed 22 June 2026.

Analog Epigenetic Memory Revealed by Targeted Chromatin Editing: Cell Genomics, www.cell.com/cell-genomics/fulltext/S2666-979X(25)00241-1 . Accessed 22 June 2026.

The Molecular Basis of Cell Memory in Mammals: The Epigenetic Cycle | Science Advances, www.science.org/doi/10.1126/sciadv.adl3188 . Accessed 22 June 2026.

Epigenetic Memory: Decoding the Blueprint of Cell Fate Determinat, www.primescholars.com/articles/epigenetic-memory-decoding-the-blueprint-of-cell-fate-determination-125775.html . Accessed 22 June 2026.

Epigenetics: Unravelling the Cancer Code | Nature, www.nature.com/articles/471S12a . Accessed 22 June 2026.

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