Off topic:Can Gene Expression Level Of A Cell Change Over Time?

Question

[Ashis]

Hi,

Lets consider that we have measured the gene expression profile of a human cell today. Will the expression levels of the genes remain same always in the future? Or can it change later? In other word, if we measure the gene expression profile of that cell again (say after several years), shall that be same as the earlier one (excluding experimental error)? If it can change, how much probable is it?

Thanks in advance.

Ashis