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How can accumulated mutations change the chromosomes and functions of cultured cells?

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tissue culture Tissue culture often requires sterile working conditions and thus is typically performed in a laminar flow cabinet (or tissue culture hood), which circulates filtered air to reduce the risk of culture contamination.

In the context of tissue culture, cells maintained in an artificial environment accumulate mutations over time. This accumulation significantly impacts both their chromosomal structure and biological function.

Chromosomal Changes

As cells continue to replicate in culture, they may undergo chromosomal mutations, which involve large-scale structural alterations to the DNA. These can include:
* Structural Rearrangements: Faulty DNA repair or rejoining can lead to deletions, duplications, inversions, or translocations of chromosomal segments.1
* Aneuploidy and Polyploidy: Cells may experience the loss or gain of whole chromosomes (aneuploidy) or the gain of entire chromosome sets (polyploidy).1

Functional Consequences

These genetic changes often alter the character and behavior of the cultured cells:
* Loss of Normal Function: Mutations can inactivate proteins or enzymes, leading to a loss of specialized activity or metabolic function.12
* Overcoming Senescence: Some mutations allow cells to bypass the Hayflick limit, enabling them to replicate indefinitely as established cell lines.3
* Abnormal Behavior: Mutations in specific genes, such as proto-oncogenes, can lead to uncontrolled cell division, transforming normal cells into cancerous ones.32

Because these changes can diverge from the original tissue's characteristics, researchers must perform authentication to verify the identity of their cell lines.3