This is the forth post on the Lu and Bourrat paper [Debating philosophers: The Lu and Bourrat paper]. The philosophers are attempting to redefine the word "gene" in order to make epigenetics compatible with current evolutionary theory.
I define a gene in the following way: "A gene is a DNA sequence that is transcribed to produce a functional product" [What Is a Gene?]. This is a biochemical/molecular definition and it's not the same as the definition used in traditional evolution.Lu and Bourrat discuss the history of the evolutionary gene and conclude,