A Pharmaceutical Researcher Is Evaluating a Nuclear Enzyme Inhibitor for the Treatment

A pharmaceutical researcher is evaluating a nuclear enzyme inhibitor for the treatment of an inherited disorder.  During an experiment, he extracts and purifies nuclear enzymes from skin cells of an affected patient.  One of these enzymes is found to catalyze the methylation of cytosine residues in DNA using S-adenosyl-methionine (SAM) as the methyl donor.  This enzyme most likely plays a crucial role in which of the following genetic processes?

A) Aneuploidy
B) Epistasis
C) Imprinting
D) Meiotic nondisjunction
E) Pleiotropy

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