2. If you were investigating the effect of metabolic inhibitors on a protein in a cell why might GAPDH not be the best housekeeping protein ?
3. What are two housekeeping proteins that you could use as an alternative?
4. Densitometry is often used to try to quantify Western Blotting results. Can you see any problems with this approach?
House-keeping genes: Genes that are
expressed constitutively in all the cells.
Tissue-specific genes/Regulated genes: Genes that are expressed
only in certain tissues at a certain point of time
Two house-keeping genes that can be
used as alternatives:
1. Ubiquitin
2. Actin
Densitometry is a visual method of
measuring the intensity of a band on the gel. It is not an absolute
method i.e. it compares the intensity of the band with another
region on the gel.
It only gives an approximate value, not an absolute concentration
of the sample.
If there are high density bands on the gel, the measurement is less
sensitive.
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