The phrase "altered gene" refers to a gene that has been changed or modified in some way, either naturally or through human intervention. This alteration can affect the way the gene works or the traits it controls in an organism. Full definition
A small Norwegian study suggested that yoga's many healthy benefits might come from its ability to alter gene expression in immune cells. (huffingtonpost.com)
Doctors generally do not treat disease by altering genes in people or changing how they work. (sciencenewsforstudents.org)
Typically, these green fluorescent proteins are used to monitor the activity of altered genes. (theweek.com)