Lysine 4 of histone H3 (H3K4) is methylated in thenucleosomes of many transcriptionally active genes.Suppose you want to determine all the places in thehuman genome where nucleosomes contain methylated H3K4.a. Starting with an antibody that specifically bindsonly to the tails of histone H3s that have K4 methylation, what kind of experiment would you perform? Outline the major steps of this experiment.b. Do you think that you would get the same results ifyour starting material was skin cells in one experiment and blood precursor cells in a second experiment? Explain.c. Describe a follow-up experiment that could determine if your data from part (a) are consistent withthe idea that H3K4 methylation marks appear onlyat transcriptionally active genes
Lysine 4 of histone H3 (H3K4) is methylated in the
nucleosomes of many transcriptionally active genes.
Suppose you want to determine all the places in the
human genome where nucleosomes contain methylated H3K4.
a. Starting with an antibody that specifically binds
only to the tails of histone H3s that have K4 methylation, what kind of experiment would you perform? Outline the major steps of this experiment.
b. Do you think that you would get the same results if
your starting material was skin cells in one experiment and blood precursor cells in a second experiment? Explain.
c. Describe a follow-up experiment that could determine if your data from part (a) are consistent with
the idea that H3K4 methylation marks appear only
at transcriptionally active genes

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