To take the DNA repair work a step farther, one of the DNA repair genes --ERCC2--is interesting because it has variable expression in individuals and is associated with three different diseases.
Phase variation
A mechanism which results in variable expression of surface antigens. An example is the switch between H1 and H2 flagellar antigens by an invertable switch in Salmonella.
The white spotting or piebald spotting gene, S/s, has variable expression, so that an SS cat often has more extensive white patching than an Ss cat.
 See also: Mutation, Gene, Origin, Protein, Expression
  
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