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Housekeeping genes aren't clustered on a single chromosome. It is perhaps not that 'housekeeping' genes - broadly expressed genes - are 'above the laws of regulation'; rather that their regulation is merely more straight-forward than that of specialised genes. I can think of 2 factors that could be relevant: Abundance of methylation sites (CpG sites) ...


6

The problem with housekeeping genes is that they are often not stable and their expression depends on the cell types as well as the conditions. They can be stable under one condition, but are not under another. So this needs to be tested every time you have to choose a housekeeping gene - always use GAPDH or beta-Actin simply doesn't work or skews the ...



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