So your outcome is continuous and you have a binary*continuous interaction term, correct? If so you wouldn't use odds ratios, but plot the slopes for gene carriers and non-gene carriers on a graph, so you would have two incongruent slopes on the same graph. Since there is interaction you would assume the lines would be disordinal (cross each other). If needed you could slap confidence bands on them as well. See Figure 1 in the below article. That image is very crude, but conveys a vague depiction of an interaction.

Smith HL, Sidwell RA. Trauma patients over-triaged to helicopter transport in an established rural state trauma system. *J Rural Health. *2013;29(2):132-139. (PMID: 23551643)